Agilent 81654A User’s Guide

S

Agilent 81650A/1A/2A/4A/5A/6A/7A

Laser Source Modules

User’s Guide

S1

Notices

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No part of t his document may reproduc ed in (includ ing
electronic storage and retrieval or translation into a
foreign language) without prio r agreement and written
consent from Agilent Technologies Deutschland GmbH
as governed by United States and international
copywright laws.

 Copyright 1999 - 2002 by:
Agilent Technologies Deutschland GmbH
Herrenberger Str. 130

71034 Böblingen
Germany

Subject Matter

The material in this document is subject to change
without no tice.

Agilent Technologies makes no warranty of a ny kind

with regard to this printed material, including, but not
limited to, the implie d warranties of merch antability
and fitness for a particular purpose.

Agilent Technologies shall not be liable for errors
contained herein or for incidental or consequential
damages in connection with the furnishing,
performance, or use of this material.

Printing History

New editions are complete revisions of the guide
reflecting alterations in the functionality of the
instrument. Updates are occasionally made to the guide
between editions. The date on the title pa ge changes
when an updated guide is published. To find out the
current revision of the guide, or to purchase an updated
guide, contact your Agilent Technologies representative.

Control Serial Number: First Edition applies directly to
all instruments.

Warranty

This Agilent Technologies instrument product is
warranted against defects in material and workmanship
for a period of one year from date of shipment. During
the warranty period, Agilent will, at its option, either
repair or replace products that p rove to be defective.

For warranty service or repair, this product must be
returned to a service facility designated by Agilent.
Buyer shall prepay shipping charges to Agilent and
Agilent shall pay shipping charges to return the product
to Buyer. However, Buyer shall pay all shipping charges,
duties, and taxes for products returned to Agilent from
another country.

Agilent warrants that its software and firmware
designated by Agilent for use with an instrument will
execute its programming instructions when properly
installed on that instrument. Agilent does not warrant
that the operation of the instrument, software, or
firmware will be uninterrupted or error free.

Exclusive Remedies

The remedies provided herein are Buyer’s sole and
exclusive remedies. Agilent Technologies shall not be
liable for an y direct, indir ect, specia l, incidental , or
conseque ntial dama ges whether based on contr act, tort,
or any other legal theory.

Assistance

Product maintenance agreements and other customer
assistance agreements are available for Agilent
Technologies products. For any assistance contact your
nearest Agilent Technologies Sales and Service Office.

Certification

Agilent Technologies Inc. certifies that this product met
its published specifications at the time of shipment from
the factory.

Agilent Technologies further certifies that its calibration
measurements are traceable to the United States
National Institute of Standards and Te chnology, NIST
(formerly the United States National Bureau of
Standards, NBS) to the extent allowed by the Institutes’s
calibration facility, and to the calibration facilities of
other International Standards Organization members.

ISO 9001 Certification

Produced to ISO 9001 international quality system
standard as part of our objective of continually
increasing customer satisfaction through improved
process control.

Third Edition:
81650-90A13
February 2002

First Edition:
81650-90013: E0100
January 2000

Second Edition:
81650-90013: E0300
March 2000

Third Edition:
81650-90A13
February 2002

Limitation of Warranty

The foregoing warranty shall not apply to defects
resulting from improper or inadequate maintenance by
Buyer, Buyer-supplied software or interfacing,
unauthorized modification or misus e, operation outside
of the environmental specifications for the product, or
improper site preparation or maintenance.

No other warranty is expressed or implied. Agilent
Technologies spec ifically disclaim s the implied
warranties of Merchantability and Fitness for a
Particular Purpose.

2 Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition

Safety Considerations

The following general safety precautions must be observed during all
phases of operation, service, and repair of this instrument. Failure to
comply with these precautions or with specific warnings elsewhere in
this manual violates safety standards of design, manufacture, and
intended use of the instrument. Agilent Technologies Inc. assumes no

liability for the customer’s failure to comply with these requirements.

Before operation, review the instrument and manual, including the
red safety page, for safety markings and instructions. You must follow
these to ensure safe operation and to maintain the instrument in safe
condition.

WARNING The WARNING sign denotes a hazard. It calls attention to a procedure,

practice or the like, which, if not correctly performed or adhered to,
could result in injury or loss of life. Do not proceed beyond a
WARNING sign until the indicated conditions are fully understood and
met.

Safety Symbols

The apparatus will be marked with this symbol when it is necessary
for the user to refer to the instruction manual in order to protect the
apparatus against damage.

Hazardous laser radiation.

Initial Inspection

Inspect the shipping container for damage. If there is damage to the
container or cushioning, keep them until you have checked the
contents of the shipment for completeness and verified the instrument
both mechanically and electrically.

The Performance Tests give procedures for checking the operation of
the instrument. If the contents are incomplete, mechanical damage or
defect is apparent, or if an instrument does not pass the operator’s
checks, notify the nearest Agilent Technologies Sales/Service Office.

WARNING To avoid hazardous electrical shock, do not perform electrical tests

when there are signs of shipping damage to any portion of the outer
enclosure (covers, panels, etc.).

Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition 3

WARNING You MUST return instruments with malfunctioning laser modules to

an Agilent Technologies Service Center for repair and calibration.

Line Power Requirements

The Agilent 81650A/1A/2A/4A/5A/6A/7A Laser Source Modules
operate when installed in the Agilent 8163A/B Lightwave Multimeter,
Agilent 8164A/B Lightwave Measurement System, and
Agilent 8166A/B Lightwave Multichannel System.

Operating Environment

The safety information in the Agilent 8163A/B Lightwave Multimeter,
Agilent 8164A/B Lightwave Measurement System, and

Agilent 8166A/B Lightwave Multichannel System User’s Guide
summarizes the operating ranges for the
Agilent 81650A/1A/2A/4A/5A/6A/7A Laser Source Modules. In order
for these modules to meet specifications, the operating environment
must be within the limits specified for the Agilent 8163A/B Lightwave
Multimeter, Agilent 8164A/B Lightwave Measurement System, and
Agilent 8166A/B Lightwave Multichannel System.

Storage and Shipment

This module can be stored or shipped at temperatures between

C and +70°C. Protect the module from temperature extremes that

−40°

may cause condensation within it.

Initial Safety Information for Laser Source Modules

The laser sources specified by this user guide are classified according
to IEC 60825-1 (2001)

The laser sources comply with 21 CFR 1040.10 except for deviations
pursuant to Laser Notice No. 50, dated 2001-July-26

4 Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition

Table 1 Standard Laser Source Modules Laser Safety Information

Agilent 81650A Agilent 81651A Agilent 81652A Agilent 81654A

Laser type FP-Laser

InGaAsP

Wavel engt h (±15nm) 1310 nm 1550 nm 1550/1625 nm 1310/1550 nm

Max. CW output power* <1.8 mW <1.8 mW <1.8 mW <1.8 mW

Beam waist diameter 9 µm9 µm9 µm9 µm

Numerical aperture 0.1 0.1 0.1 0.1

Laser Class according to
IEC 60825-1 (2001)- International

Max. permissible CW output power 15.6 mW 10 mW 10 mW 15.6 mW/10 mW

* Max. CW output power is defined as the highest possible optical power that the laser source can produce at its output

connector.

1111

FP-Laser
InGaAsP

FP-Laser
InGaAsP

Table 2 High Power Laser Source Modules Laser Safety Information

Agilent 81655A Agilent 81656A Agilent 81657A

FP-Laser
InGaAsP

Laser Type FP-Laser

InGaAsP

Wav elen gth (±15nm) 1310 nm 1550 nm 1310/1550 nm

Max. CW output power* <28 mW <28 mW <28 mW

Beam waist diameter 9 µm9 µm9 µm

Numerical aperture 0.1 0.1 0.1

Laser Class according to
IEC 60825-1 (2001)- International

Max. permissible CW output power 52 mW 163 mW 52 mW/163 mW

* Max. CW output power is defined as the highest possible optical power that the laser source can pro-

duce at its output connector. .

1M 1M 1M

FP-Laser
InGaAsP

FP-Laser
InGaAsP

Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition 5

Laser Safety Labels

Laser class 1 label

Figure 1 Class 1 Safety Label - Agilent 81650A/51A/52A/54A

Laser class 1M label

Figure 2 Class 1M Safety Label - Agilent 81655A/6A/7A

A sheet of laser safety labels is included with the laser module as
required. In order to meet the requirements of IEC 60825-1 we
recommend that you stick the laser safety labels, in your language,
onto a suitable location on the outside of the instrument where they
are clearly visible to anyone using the instrument

WARNING Please pay attention to the following laser safety warnings:

• Under no circumstances look into the end of an optical cable

attached to the optical output when the device is operational. The

laser radiation can seriously damage your eyesight.

• Do not enable the laser when there is no fiber attached to the

optical output connector.

6 Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition

• The laser is enabled by pressing the gray button close to the optical

output connector on the front panel of the module. The laser is on

when the green LED on the front panel of the instrument is lit.

• The use of the instruments with this product will increase the

hazard to your eyes.

• The laser module has built-in safety circuitry which will disable the

optical output in the case of a fault condition.

• Refer servicing only to qualified and authorized personnel.

Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition 7

8 Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition

Table of Contents

Laser Sources 13

Table of Contents

Safety Considerations 3

Safety Symbols 3
Initial Inspection 3

Line Power Requirements 4
Operating Environment 4

Storage and Shipment 4

Initial Safety Information for Laser Source Modules 4
Laser Safety Labels 6

Getting Started with Laser Source Modules 15

What is a Laser Source Module ? 15
A Description of the Front Panel 15

How to Enable/Disable Laser Output 15

Optical Output 16

Angled Contact Connectors 16

Accessories 17

Modules and Options 19

Specifications 21

Definition of Terms 23

Center wavelength 23
Spectral width 23
Output power 24
CW power stability 24
CW power stability due to backreflection 24

Laser Source Module Specifications 26

Laser Source Module Specifications
(Standard modules, 0 dBm) 26

Supplementary Performance Characteristics 27
Laser Safety Information 27

Laser Source Module Specifications (High Power, 13 dBm) 28

Supplementary Performance Characteristics 29
Laser Safety Information 29

Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition 9

Table of Contents

Performance Tests 31

Cleaning Instructions 67

Equipment Required 33
Tes t R ec or d 33
Test Failure 33
Instrument Specification 34

Performance Test 34

Center Wavelength and Spectral Bandwidth Test 35

Example for Agilent Technologies 81650A 36

Output Power and Stability Test 36

Output Power Test 36
Stability Test 37

Safety Precautions 69
Why is it important to clean optical devices ? 69
What do I need for proper cleaning? 70

Standard Cleaning Equipment 70

Dust and shutter caps 70
Isopropyl alcohol 71
Cotton swabs 71
Soft tissues 72
Pipe cleaner 72
Compressed air 72

Additional Cleaning Equipment 73

Microscope with a magnification range about 50X up to 300X 73
Ultrasonic bath 73
Warm water and liquid soap 74
Premoistened cleaning wipes 74
Polymer film 74
Infrared Sensor Card 74

Preserving Connectors 75
Cleaning Instrument Housings 75
Which Cleaning Procedure should I use ? 76
How to clean connectors 76
How to clean connector adapters 77
How to clean connector interfaces 78
How to clean bare fiber adapters 79

10 Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition

Table of Contents

How to clean lenses

80

How to clean instruments with a fixed connector interface

80

How to clean instruments with an optical glass plate 81
How to clean instruments with a physical contact interface

81

How to clean instruments with a recessed lens interface 82
How to clean optical devices which are sensitive to

mechanical stress and pressure

83

How to clean metal filters or attenuator gratings 84
Additional Cleaning Information 85

How to clean bare fiber ends 85
How to clean large area lenses and mirrors 85

Other Cleaning Hints 87

Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition 11

Table of Contents

12 Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition

Laser Sources

Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition 13

Laser Sources

This chapter introduces the features of the HP 8163A Lightwave
Multimeter &
HP 8164A Lightwave Measurement System.

14 Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition

Laser Sources Getting Started with Laser Source Modules

Getting Started with Laser Source Modules

What is a Laser Source Module ?

A laser source module is a laser source that emits radiation at a
specific optical wavelength. The specific wavelength for each of the
Agilent Technologies range of fixed wavelength laser source modules

can be found in the Specifications chapter of the relevant module’s
User’s Guide.

A Description of the Front Panel

Figure 3 Front Panel of Low Power and High Power Laser Source Modules

To insert these modules into your mainframe see your mainframe’s
User’s Guide.

How to Enable/Disable Laser Output

This indicates whether the module is emitting radiation. If the State
parameter is On, the green LED on the front panel of the module is lit
indicating the laser is active. If the State parameter is Off, green LED
on the front panel of the module is unlit indicating the laser is
inactive. You can switch the module by pressing the Active button on
the front panel of the module.

15 Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition

Laser Sources Getting Started with Laser Source Modules

Optical Output

Angled Contact Connectors

The HP 8163A Lightwave Multimeter &
HP 8164A Lightwave Measurement System are equipped with an straight
contact optical output connector as standard.

Straight Con tact

Connector Symbol

Figure 4 Straight Contact Connector Symbols

Figure 4 shows the symbol for straight contact connectors.

16 Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition

Accessories

Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition 17

Accessories

The Agilent 81650A/1A/2A/4A/5A/6A/7A Laser Source Modules are
available in various configurations for the best possible match to the
most common applications.

This chapter provides information on the available options and
accessories.

18 Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition

Modules and Options Accessories

Modules and Options

Standard Laser Source
Modules 0 dBm

81650A 1310 nm Fabry Perot
81651A 1550 nm Fabry Perot
81652A 1550/1625 nm Fabry Perot
81653A 1650 nm Fabry Perot
81654A 1310/1550 nm Fabry Perot

Source
Modules
0 dBm

12

Connector
Interface

Agilent 8163A
Lightwave Multimeter

Source
Modules
+13 dBm

Connector Interfaces

81000AI Diamond HMS-10
81000FI FC/PC/SPC
81000GI D4
81000HI E-2000
81000KI SC/PC/SPC
81000SI DIN 47526
81000VI ST
81000WI Biconic

High Power Laser Source
Modules +13 dBm

81656A 1550 nm Fabry Perot
81657A 1310/1550 nm Fabry Perot

Figure 5 Recommended Connector Interfaces

Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition 19

Accessories Modules and Options

20 Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition

Specifications

Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition 21

Specifications

The Agilent 81650A/1A/2A/4A/5A/6A/7A Laser Source Modules are
produced to the ISO 9001 international quality system standard as

part of Agilent Technologies’s commitment to continually increasing
customer satisfaction through improved quality control.

Specifications describe the modules’ and heads’ warranted
performance. Supplementary performance characteristics describe the
modules’ and heads’ non-warranted typical performance.

Because of the modular nature of the instrument, these performance
specifications apply to these modules and heads rather than the
mainframe unit.

22 Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition

Definition of Terms Specifications

Definition of Terms

This section defines terms that are used both in this chapter and
“Performance Tests” on page 31.

Generally, all specifications apply for the given environmental
conditions and after warmup time.

Measurement principles are indicated. Alternative measurement
principles of equal value are also acceptable.

Center wavelength

The center wavelength is defined as the spectral center of gravity. For
a Fabry-Perot type laser source with discrete longitudinal modes, this
definition can be expressed as:

λ

3

∑

λ

=

&

where:

=power levels of the individual longitudinal lines

P

i

=wavelengths of the individual longitudinal lines

λ

i

∑

LL

3

L

Spectral width

The spectral width of an optical source is defined as the source’s full­width half-maximum (FWHM) spectral width,
continuous spectrum, e.g., the spectrum of a Fabry-Perot type laser
diode, the spectral width is defined as the FWHM of the spectral
envelope, to be calculated from the RMS spectral width,

λ

3

LL

3

WRWDO

2



0

Σ




=

λ

506

= ∆∆

λλ

):+0 506

∆λ

2

- ∆

λ

FHQWHU

FWHM





. For a non-

:

∆λ

RMS

/

12

and

where:λ

Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition 23

=center wavelength of laser diode in vacuum

center

=Σ P

P

total

= total power, in watts

i

Specifications Definition of Terms

th

longitudinal mode

th

longitudinal mode, in vacuum

envelope

P

=power of i

i

=wavelength of i

λ

i

M =multiplication factor; for a source with a gaussian

M = 2.35; for other types of spectra, use M = 2.35 as well

Output power

The maximum output power at the specified center wavelength.

Conditions: Temperature within operating temperature range.
Measurement with power meter at the end of specified patchcord.

CW power stability

The change of the power level during given time span, expressed as
half the span of power changes relative to the mean power.

Conditions: uninterrupted line voltage, constant power level setting,

operating temperature change not more than ±∆T as specified.

±

CW power stability due to backreflection

The change of the power level, expressed as half the span of power
changes relative to the mean power caused by variable backreflection
within given limits.

Conditions: uninterrupted line voltage, constant power level setting,
CW operation, operating temperature change within specified limits,
minimum return loss as pecified, all polarization states of
backreflection included.

Measurement: The change of the output power is monitored while the
source’s susceptibility to backreflection is tested by disturbing the
laser oscillation with power reflected back into the laser, P
backreflection sensitivity depends on the absolute power level of P
and on the polarization state of P

At fixed power levels of P
maximum when the states of polarization (SOP) of P
source’s output power) are identical. To achieve this condition a
polarization controller generates all SOPs of P
CW stability is a worst case value with respect to the SOP. The test
should be done at various power levels of P
the CW stability is specified for a range of backreflectances. However,
the highest backreflection is the most critical by experience.

, backreflection sensitivity has its

back

back

.

±

back

and Pin (the

back

. Thus the measured

back

to address the fact that

back

. The

back

24 Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition

Definition of Terms Specifications

NOTE Power reflected back from the radiating fiber end in general creates

instability in the laser cavity (mode jumps) resulting in output power
instability. The ratio of the incident optical power P
optical power P

of an optical component is called return loss,

back

to the reflected

in

symbol RL:





3

5/

=

10 log

LQ





3





EDFN

Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition 25

Specifications Laser Source Module Specifications

Laser Source Module Specifications

Laser Source Module Specifications (Standard modules, 0 dBm)

Specifications apply to the end of a 2-meter long fiber cable (as
specified under fiber type) with Diamond
connectors attached. All specifications are valid for an attenuation
setting of 0.0 dB.

All modules require straight output connectors.

Table 3 Standard Laser Source Module Specifications

81650A 81651A 81652A 81654A

Laser Type
Center Wavelength

Fiber Type single-mode 9/125 µm
Spectral width (rms)
Output power (Class 1)
CW power stability

1

1, 2

3

4, 5

short term (15 min)

long term (24 h)

1310 nm

15 nm

±

< 3.5 nm < 4.5 nm < 4.5 / 5.5 nm < 3.5 / 4.5 nm

typ. < ± 0.003 dB with coherence control active

Fabry-Perot Laser Diode

1550 nm

15 nm

±

> 0 dBm (1 mW)

< ± 0.005 dB

typ. ± 0.03 dB



1550/1625nm

±

HMS-10/Agilent

15 nm

1310/1550nm

15 nm

±

to backreflection (RL ≥ 14 dB)

Dimensions (H x W x D) 75 mm × 32 mm × 335 mm (2.8” × 1.3” × 13.2”)
Weight 0.5 kg
Recalibration Period 2 years
Operating Temperature
Humidity

Warm-up time
1 Central wavelength is shown on display

2 rms: root mean square

4

typ. ± 0.003 dB

0°C to +45°C

Non-condensing

60 minutes

26 Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition

Laser Source Module Specifications Specifications

Table 3 Standard Laser Source Module Specifications

81650A 81651A 81652A 81654A

3 Class 1 according to IEC 60825-1 (1998)

Class I according to FDA CFR 21 (1995)

4 Warm-up time 20 minutes, if previously stored at the same temperature
5 Constant temperature ∆T = ± 1°C

Supplementary Performance Characteristics

Internal digital modulation mode: 270 Hz, 330 Hz, 1 kHz, 2 kHz, and free

selection 200 Kz to 10 kHz.

All outputs are pulse shaped, duty cycle 50%.

Improved coherence control for linewidth broadening.

Ooutput attenuation: The output power of all source modules can be

attenuated from 0 dB to 6 dB in steps of 0.1 dB.

Laser Safety Information

In the USA, the above products are classified as Class I according to
21 CFR 1040.10 (1995).

Internationally the same products are classified as Class 1 according
to IEC 60825-1 (1998).

Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition 27

Specifications Laser Source Module Specifications

Laser Source Module Specifications (High Power, 13 dBm)

Specifications apply to the end of a 2-meter long fiber cable (as
specified under fiber type) with Diamond
connectors attached. All specifications are valid for an attenuation
setting of 0.0 dB.

All modules require straight output connectors.

Table 4 High Power Laser Source Module Specifications

Agilent 81655A Agilent 81656A Agilent 81657A

Laser Type
Center Wavelength

Fiber Type single-mode 9/125 µm
Spectral width (rms)
Output power (Class 3B)

CW power stability

1

1, 2

3

4 , 5

short term (15 min)

long term (24 h)

1310 nm ± 15 nm 1550 nm ± 15 nm 1310/1550nm ± 15 nm

< 5.5 nm < 7.5 nm < 5.5 / 7.5 nm

typ. < ± 0.003 dB with coherence control active



HMS-10/Agilent

Fabry-Perot Laser Diode

> +13 dBm (20 mW)

< ± 0.005 dB

typ. ± 0.03 dB

to backreflection (RL ≥ 14 dB)

Dimensions (H x W x D) 75 mm × 32 mm × 335 mm (2.8” × 1.3” × 13.2”)
Weight 0.5 kg
Recalibration Period 2 years
Operating Temperature
Humidity

Warm-up time
1 Central wavelength is shown on display

2 rms: root mean square
3 Class 3A according to IEC 60825-1 (1998)

Class IIIb according to FDA CFR 21 (1995)

4 Warm-up time 20 minutes, if previously stored at the same temperature
5 Constant temperature ∆T = ± 1°C

4

typ. ± 0.003 dB

0°C to +45°C

Non-condensing

60 minutes

28 Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition

Laser Source Module Specifications Specifications

Supplementary Performance Characteristics

Internal digital modulation mode: 270 Hz, 330 Hz, 1 kHz, 2 kHz, and free

selection 200 Kz to 10 kHz.

All outputs are pulse shaped, duty cycle 50%.

Internal coherence control for linewidth broadening.

Ooutput attenuation: The output power of all source modules can be

attenuated from 0 dB to 6 dB in steps of 0.1 dB.

Laser Safety Information

In the USA, the above products are classified as Class IIIb according to
21 CFR 1040.10 (1995).

Internationally the same products are classified as Class 3A according
to IEC 60825-1 (1998).

Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition 29

Specifications Laser Source Module Specifications

30 Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition

Performance Tests

Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition 31

Performance Tests

The procedures in this section test the optical performance of the

instrument. The complete specifications to which the Agilent

81650A/1A/2A/4A/5A/6A/7A Laser Source module is tested are given

in “Performance Tests” on page 31. All tests can be performed without

access to the interior of the instrument. The performance tests refer

specifically to tests using the Diamond HMS-10/Agilent connector.

32 Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition

Equipment Required

Equipment required for the performance test is listed below.

Table 1 Required Equipment

Performance Tests

Instrument/Accessory Recommended Model 81650A – 81657A Required

Characteristics

Multimeter Mainframe Agilent 8163A x Agilent 8164A

Power Meter Standard HP 81533B Optical Head Interface

Module and
HP 81525A Reference Optical Head

Optical Spectrum Analyz-erHP 71452B x HP 71450A or

Singlemode Fibers Agilent 81101AC x

Agilent 81113PC x

Connector Adapters Agilent 81000SA x

Connector Interfaces Agilent 81000AI (2 ea) x

Agilent 81000FI x

Plastic Cap 5040-9351 x

Legend:

- not applicable

xnecessary

ooptional

x Agilent 81618A and

Alternative Models

Agilent 81625A

HP 71451A

Test Record

Results of the performance test may be tabulated on the Test Record
provided at the end of the test procedures. It is recommended that you
fill out the Test Record and refer to it while doing the test. Since the
test limits and setup information are printed on the Test Record for
easy reference, the record can also be used as an abbreviated test
procedure (if you are already familiar with the test procedures). The
Test Record can also be used as a permanent record and may be
reproduced without written permission from Agilent Technologies.

Test Failure

If the Agilent 81650A/1A/2 A /4A/5A/6A/7A Laser Source module fails an y
performance test, return the instrument to the nearest Agilent Technologies
Sales/Service Office for repair.

Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition 33

Performance Tests Performance Test

Instrument Specification

Specifications are the performance characteristics of the instrument
that is certified. These specifications, listed in

SDJH , are the performance standards or limits against which the Agilent
Technologies 81650A/1A/2A/4A/5A/6A/7A Laser Source module can be
tested. ³6SHFLILFDWLRQV´RQSDJH  also lists some supplemental characteristics
of the Agilent Technologies 81650A/1A/2A/4A/5A/6A/7A Laser Source
module and should be considered as additional in formation.

Any changes in the specifications due to manufacturing changes,
design, or traceability to the National Institute of Standards and
Technology (NIST), will be covered in a manual change supplement, or
revised manual. Such specifications supercede any that were
previously published.

³6SHFLILFDWLRQV´RQ

Performance Test

The performance tests given in this section includes the Output Power
Test and the Stability Test. Perform each step in the order given, using
the corresponding test equipment.

NOTE Make sure that all optical connections of the test setups given in the

procedure are dry and clean. DO NOT USE INDEX MATCHING OIL.
For cleaning, use the cleaning instructions given in “Cleaning
Instructions” on page 67.

The ambient temperature must be constant (±1K) during the test. The
power meter must be zeroed before the measurement.

TIP The full sequence of tests should be performed first at 1310 nm and

again at 1550 nm if using a dual wavelength source. Performing all the
tests for one wavelength together provides the warm-up time for the
stability test.

34 Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition

Performance Test Performance Tests

81101AC

Center Wavelength and Spectral Bandwidth Te s t

71452B Optical Spectrum Analyzer

71452B

Mainf r ame 81 63A w / 8165xA S ource

8165xA

Figure 6 Measurement Setup for Center Wavelength and Spectral Bandwidth

1 Make sure that cable connector, detectors and adapters are clean.

8163A

2 Setup the equipment as shown in Figure 6.

3 Switch the Agilent 8165xA Laser Source module on.

4 Press the green button InstrPreset on the HP 71452B front panel to

reset the optical spectrum analyzer.

5 Start the auto measurement by pressing the yellow button

AutoMeas.

6 Adjust the Optical Spectrum Analyzer (OSA) for use with Fabry-

Perot laser sources (the Agilent 8165xA DUTs are Fabry-Perot laser

sources):

a Press the User hardkey.
b

Press the [FP] softkey.

7 Set up the spectrum analyzer:

a Press Menu.
b Press the [
c Press the [
d Press the User hardkey.
e Press the [

Amptd] softkey.
Linear] softkey.

SingleSweep] softkey.

8 In the field given at the top of the screen, the Fabry-Perot laser test

results are shown. Note the mean wavelength as the FWHM

bandwidth in the test record.

Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition 35

Performance Tests Performance Test

(

)

Example for Agilent Technologies 81650A

3DUDPHWHU 0LQ6SHF 5HVXOW 0D[6SHF

Mean wavelength 1295.0 nm 1309,46 nm 1325.0 nm
FWHM 2,87 nm < 3.5 nm

Output Power and Stability Test

Mainframe 8163A w/ 8165xA (DUT)
and 81533B + 81525A

8165xA 81533B

8163A

Ref

81113PC

Connector

slanted

Figure 7 Measurement Setup for Output Power and Stability Test

Optical Head 81525A

Ref

Output Power Test

1 Make absolutly sure that cable connectors and detector windows

are clean.

2 Enable the laser output of the Agilent 8165xA and allow

instruments to warm up for at least 20 minutes.

3 On the power meter:

a Set the wavelength of the power sensor exactly to the wavelength of the

laser source.

b Ensure that the [C
c With the connector adapter on the optical head, covered with a plastic

cap, zero the powermeter.

d Set the averaging time to 500 ms.

AL] parameter on the powermeter is set to zero.

4 Connect the equipment as shown in figure D-2.

5 On the Agilent 8163A with the module under test (DUT):

36 Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition

Performance Test Performance Tests

a Ensu re that the laser source is in CW mode.
b Ensure that the attenuation for the measured wavelength is set to zero.

6 Measure the output power and note the result in the test record.

Stability Test

1 Make sure the laser source Agilent 8165xA has warmed up for 20

minutes.

2 Select the channel with the source.

a Ensu re that the modulation of the source is switched off.
b Make sure that the attenuation of the source is set to zero.

3 Using the Agilent 81113PC cable, connect the output of the source

to the input of the sensor. Make sure that the cable is fixed and that

it cannot be moved during the measurement.

4 On the mainframe, press Appl and select the Stability application.

5 Press Parameter and set the Total time to 15:00 minutes.

6 Edit the averaging time to 1s and make sure that the maximum

number of samples exceeds 900.

7 Set the wavelength of the sensor to the wavelength of the source.

8 Select as Range mode ’Auto’.

9 Start the stability measurement by pressing ’Measure’. Do not touch

the cables while the measurement is running.

10 When the stability test has completed, press ’Analysis’, select as unit

[dB] and press more.

11 Note the result∆P in the test record.

Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition 37

Performance Tests Performance Test

38 Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition

Performance Test Performance Tests

Performance Test for the Agilent 81650A

Page 1 of 3

Model Agilent 81650A

Laser Source Module (1310 nm)

Serial No. _________________________ Ambient Temperature ___________

Options _________________________ Relative Humidity ___________ %

Firmware Rev. _________________________ Line Frequency ___________ Hz

Test Facility _________________________ Customer _________________________

Performed by _________________________ Report No _________________________

Special Notes ______________________________________________________________________

______________________________________________________________________

______________________________________________________________________

______________________________________________________________________

______________________________________________________________________

______________________________________________________________________

Date ___________

°C

______________________________________________________________________

______________________________________________________________________

Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition 39

Performance Tests Performance Test

Performance Test for the Agilent 81650A Test Equipment Used

Page 2 of 3

Description Model No. Trace No Cal. Due Date

1a Lightwave Multimeter (Std.) Agilent 8163A ____________ ___________

1b TLS Mainframe Agilent 8164A ____________ ___________

2a Opt. Head Interface Module HP 81533B ____________ ___________

2b Opt. Head Interface Module Agilent 81618A ____________ ___________

3a Optical Head HP 81525A ____________ ___________

3b Optical Head Agilent 81625A ____________ ___________

4 Optical Spectrum Analyzer HP 71452B ____________ ___________

5 ____________________________ ____________ ____________ ___________

6 ____________________________ ____________ ____________ ___________

7 ____________________________ ____________ ____________ ___________

8 ____________________________ ____________ ____________ ___________

9 ____________________________ ____________ ____________ ___________

10 ____________________________ ____________ ____________ ___________

11 ____________________________ ____________ ____________ ___________

12 ____________________________ ____________ ____________ ___________

Accessories # Product # Product # Product

Connector Adapters 1 81000AA

Backreflector Kit 1 8156A #203

Connector Adapters 1 81000AA

40 Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition

Performance Test Performance Tests

Performance Test for the Agilent 81650A

Page 3 of 3

Model Agilent 81650A Sensor Module Report No.________ Date ________________

Te s t
No. Center Wavelength

IAccuracy Test

measured at _______ nm
(1310nm)

II Spectral Bandwidth (rms)

measured at _______ nm
(1310 nm)

III

Output Power [dBm]

measured at _______ nm
(1310 nm)

Min.

Spec. Result

[nm]

1295 nm _______ 1325 nm

[nm]

_______ < 3.5 nm

0 dBm < _______

Max.

Spec.

Measurement

Uncertainty

IV Power Stability

measured at _______ nm
(1310 nm)

Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition 41

[dB] [dB]

_______ < 0.01

Performance Tests Performance Test

42 Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition

Performance Test Performance Tests

Performance Test for the Agilent 81651A

Page 1 of 3

Model Agilent 81651A

Laser Source Module (1550 nm)

Serial No. _________________________ Ambient Temperature ___________

Options _________________________ Relative Humidity ___________ %

Firmware Rev. _________________________ Line Frequency ___________ Hz

Test Facility _________________________ Customer _________________________

Performed by _________________________ Report No _________________________

Special Notes ______________________________________________________________________

______________________________________________________________________

______________________________________________________________________

______________________________________________________________________

______________________________________________________________________

______________________________________________________________________

Date ___________

°C

______________________________________________________________________

______________________________________________________________________

Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition 43

Performance Tests Performance Test

Performance Test for the Agilent 81651A Test Equipment Used

Page 2 of 3

Description Model No. Trace No Cal. Due Date

1a Lightwave Multimeter (Std.) Agilent 8163A ____________ ___________

1b TLS Mainframe Agilent 8164A ____________ ___________

2a Opt. Head Interface Module HP 81533B ____________ ___________

2b Opt. Head Interface Module Agilent 81618A ____________ ___________

3a Optical Head HP 81525A ____________ ___________

3b Optical Head Agilent 81625A ____________ ___________

4 Optical Spectrum Analyzer HP 71452B ____________ ___________

5 ____________________________ ____________ ____________ ___________

6 ____________________________ ____________ ____________ ___________

7 ____________________________ ____________ ____________ ___________

8 ____________________________ ____________ ____________ ___________

9 ____________________________ ____________ ____________ ___________

10 ____________________________ ____________ ____________ ___________

11 ____________________________ ____________ ____________ ___________

12 ____________________________ ____________ ____________ ___________

Accessories # Product # Product # Product

Connector Adapters 1 81000AA

Backreflector Kit 1 8156A #203

Connector Adapters 1 81000AA

44 Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition

Performance Test Performance Tests

Performance Test for the Agilent 81651A

Page 3 of 3

Model Agilent 81651A Sensor Module Report No.________ Date ________________

Te s t
No. Center Wavelength

IAccuracy Test

measured at _______ nm
(1550nm)

II Spectral Bandwidth (rms)

measured at _______ nm
(1550 nm)

III

Output Power [dBm]

measured at _______ nm
(1550 nm)

Min.

Spec. Result

[nm]

1535 nm _______ 1565 nm

[nm]

_______ < 4.5 nm

0 dBm < _______

Max.

Spec.

Measurement

Uncertainty

IV Power Stability

measured at _______ nm
(1550 nm)

Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition 45

[dB] [dB]

_______ < 0.01

Performance Tests Performance Test

46 Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition

Performance Test Performance Tests

Performance Test for the Agilent 81652A

Page 1 of 3

Model Agilent 81652A

Laser Source Module (1550/1625 nm)

Serial No. _________________________ Ambient Temperature ___________

Options _________________________ Relative Humidity ___________ %

Firmware Rev. _________________________ Line Frequency ___________ Hz

Test Facility _________________________ Customer _________________________

Performed by _________________________ Report No _________________________

Special Notes ______________________________________________________________________

______________________________________________________________________

______________________________________________________________________

______________________________________________________________________

______________________________________________________________________

______________________________________________________________________

Date ___________

°C

______________________________________________________________________

______________________________________________________________________

Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition 47

Performance Tests Performance Test

Performance Test for the Agilent 81652A Test Equipment Used

Page 2 of 3

Description Model No. Trace No Cal. Due Date

1a Lightwave Multimeter (Std.) Agilent 8163A ____________ ___________

1b TLS Mainframe Agilent 8164A ____________ ___________

2a Opt. Head Interface Module HP 81533B ____________ ___________

2b Opt. Head Interface Module Agilent 81618A ____________ ___________

3a Optical Head HP 81525A ____________ ___________

3b Optical Head Agilent 81625A ____________ ___________

4 Optical Spectrum Analyzer HP 71452B ____________ ___________

5 ____________________________ ____________ ____________ ___________

6 ____________________________ ____________ ____________ ___________

7 ____________________________ ____________ ____________ ___________

8 ____________________________ ____________ ____________ ___________

9 ____________________________ ____________ ____________ ___________

10 ____________________________ ____________ ____________ ___________

11 ____________________________ ____________ ____________ ___________

12 ____________________________ ____________ ____________ ___________

Accessories # Product # Product # Product

Connector Adapters 1 81000AA

Backreflector Kit 1 8156A #203

Connector Adapters 1 81000AA

48 Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition

Performance Test Performance Tests

Performance Test for the Agilent 81652A

Page 3 of 3

Model Agilent 81652A Sensor Module Report No.________ Date ________________

Te s t
No. Center Wavelength

IAccuracy Test

measured at _______ nm
(1550 nm)

measured at _______ nm
(1625 nm)

II Spectral Bandwidth (rms)

measured at _______ nm
(1550 nm)

measured at _______ nm
(1625 nm)

III

Output Power [dBm]

Min.

Spec. Result

[nm]

1535 nm _______ 1565 nm

1610 nm _______ 1640 nm

[nm]

_______ < 4.5 nm

_______ < 5.5 nm

Max.

Spec.

Measurement

Uncertainty

measured at _______ nm
(1550 nm)

measured at _______ nm
(1625 nm)

IV Power Stability

measured at _______ nm
(1550 nm)

measured at _______ nm
(1625 nm)

Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition 49

0 dBm < _______

0 dBm < _______

[dB] [dB]

_______ < 0.01

_______ < 0.01

Performance Tests Performance Test

50 Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition

Performance Test Performance Tests

Performance Test for the Agilent 81654A

Page 1 of 3

Model Agilent 81654A

Laser Source Module (1310/1550 nm)

Serial No. _________________________ Ambient Temperature ___________

Options _________________________ Relative Humidity ___________ %

Firmware Rev. _________________________ Line Frequency ___________ Hz

Test Facility _________________________ Customer _________________________

Performed by _________________________ Report No _________________________

Special Notes ______________________________________________________________________

______________________________________________________________________

______________________________________________________________________

______________________________________________________________________

______________________________________________________________________

______________________________________________________________________

Date ___________

°C

______________________________________________________________________

______________________________________________________________________

Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition 51

Performance Tests Performance Test

Performance Test for the Agilent 81654A Test Equipment Used

Page 2 of 3

Description Model No. Trace No Cal. Due Date

1a Lightwave Multimeter (Std.) Agilent 8163A ____________ ___________

1b TLS Mainframe Agilent 8164A ____________ ___________

2a Opt. Head Interface Module HP 81533B ____________ ___________

2b Opt. Head Interface Module Agilent 81618A ____________ ___________

3a Optical Head HP 81525A ____________ ___________

3b Optical Head Agilent 81625A ____________ ___________

4 Optical Spectrum Analyzer HP 71452B ____________ ___________

5 ____________________________ ____________ ____________ ___________

6 ____________________________ ____________ ____________ ___________

7 ____________________________ ____________ ____________ ___________

8 ____________________________ ____________ ____________ ___________

9 ____________________________ ____________ ____________ ___________

10 ____________________________ ____________ ____________ ___________

11 ____________________________ ____________ ____________ ___________

12 ____________________________ ____________ ____________ ___________

Accessories # Product # Product # Product

Connector Adapters 1 81000AA

Backreflector Kit 1 8156A #203

Connector Adapters 1 81000AA

52 Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition

Performance Test Performance Tests

Performance Test for the Agilent 81654A

Page 3 of 3

Model Agilent 81654A Sensor Module Report No.________ Date ________________

Te s t
No. Center Wavelength

IAccuracy Test

measured at _______ nm
(1310 nm)

measured at _______ nm
(1550 nm)

II Spectral Bandwidth (rms)

measured at _______ nm
(1310 nm)

measured at _______ nm
(1550 nm)

III

Output Power [dBm]

Min.

Spec. Result

[nm]

1295 nm _______ 1325 nm

1535 nm _______ 1565 nm

[nm]

_______ < 3.5 nm

_______ < 4.5 nm

Max.

Spec.

Measurement

Uncertainty

measured at _______ nm
(1310 nm)

measured at _______ nm
(1550 nm)

IV Power Stability

measured at _______ nm
(1310 nm)

measured at _______ nm
(1550 nm)

Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition 53

0 dBm < _______

0 dBm < _______

[dB] [dB]

_______ < 0.01

_______ < 0.01

Performance Tests Performance Test

54 Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition

Performance Test Performance Tests

Performance Test for the Agilent 81655A

Page 1 of 3

Model Agilent 81655A

Laser Source Module (1310 nm)

Serial No. _________________________ Ambient Temperature ___________

Options _________________________ Relative Humidity ___________ %

Firmware Rev. _________________________ Line Frequency ___________ Hz

Test Facility _________________________ Customer _________________________

Performed by _________________________ Report No _________________________

Special Notes ______________________________________________________________________

______________________________________________________________________

______________________________________________________________________

______________________________________________________________________

______________________________________________________________________

______________________________________________________________________

Date ___________

°C

______________________________________________________________________

______________________________________________________________________

Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition 55

Performance Tests Performance Test

Performance Test for the Agilent 81655A Test Equipment Used

Page 2 of 3

Description Model No. Trace No Cal. Due Date

1a Lightwave Multimeter (Std.) Agilent 8163A ____________ ___________

1b TLS Mainframe Agilent 8164A ____________ ___________

2a Opt. Head Interface Module HP 81533B ____________ ___________

2b Opt. Head Interface Module Agilent 81618A ____________ ___________

3a Optical Head HP 81525A ____________ ___________

3b Optical Head Agilent 81625A ____________ ___________

4 Optical Spectrum Analyzer HP 71452B ____________ ___________

5 ____________________________ ____________ ____________ ___________

6 ____________________________ ____________ ____________ ___________

7 ____________________________ ____________ ____________ ___________

8 ____________________________ ____________ ____________ ___________

9 ____________________________ ____________ ____________ ___________

10 ____________________________ ____________ ____________ ___________

11 ____________________________ ____________ ____________ ___________

12 ____________________________ ____________ ____________ ___________

Accessories # Product # Product # Product

Connector Adapters 1 81000AA

Backreflector Kit 1 8156A #203

Connector Adapters 1 81000AA

56 Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition

Performance Test Performance Tests

Performance Test for the Agilent 81655A

Page 3 of 3

Model Agilent 81655A Sensor Module Report No.________ Date ________________

Te s t
No. Center Wavelength

IAccuracy Test

measured at _______ nm
(1310nm)

II Spectral Bandwidth (rms)

measured at _______ nm
(1310 nm)

III

Output Power [dBm]

measured at _______ nm
(1310 nm)

Min.

Spec. Result

[nm]

1295 nm _______ 1325 nm

[nm]

_______ < 5.5 nm

13 dBm < _______

Max.

Spec.

Measurement

Uncertainty

IV Power Stability

measured at _______ nm
(1310 nm)

Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition 57

[dB] [dB]

_______ < 0.01

Performance Tests Performance Test

58 Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition

Performance Test Performance Tests

Performance Test for the Agilent 81656A

Page 1 of 3

Model Agilent 81656A

Laser Source Module (1550 nm)

Serial No. _________________________ Ambient Temperature ___________

Options _________________________ Relative Humidity ___________ %

Firmware Rev. _________________________ Line Frequency ___________ Hz

Test Facility _________________________ Customer _________________________

Performed by _________________________ Report No _________________________

Special Notes ______________________________________________________________________

______________________________________________________________________

______________________________________________________________________

______________________________________________________________________

______________________________________________________________________

______________________________________________________________________

Date ___________

°C

______________________________________________________________________

______________________________________________________________________

Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition 59

Performance Tests Performance Test

Performance Test for the Agilent 81656A Test Equipment Used

Page 2 of 3

Description Model No. Trace No Cal. Due Date

1a Lightwave Multimeter (Std.) Agilent 8163A ____________ ___________

1b TLS Mainframe Agilent 8164A ____________ ___________

2a Opt. Head Interface Module HP 81533B ____________ ___________

2b Opt. Head Interface Module Agilent 81618A ____________ ___________

3a Optical Head HP 81525A ____________ ___________

3b Optical Head Agilent 81625A ____________ ___________

4 Optical Spectrum Analyzer HP 71452B ____________ ___________

5 ____________________________ ____________ ____________ ___________

6 ____________________________ ____________ ____________ ___________

7 ____________________________ ____________ ____________ ___________

8 ____________________________ ____________ ____________ ___________

9 ____________________________ ____________ ____________ ___________

10 ____________________________ ____________ ____________ ___________

11 ____________________________ ____________ ____________ ___________

12 ____________________________ ____________ ____________ ___________

Accessories # Product # Product # Product

Connector Adapters 1 81000AA

Backreflector Kit 1 8156A #203

Connector Adapters 1 81000AA

60 Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition

Performance Test Performance Tests

Performance Test for the Agilent 81656A

Page 3 of 3

Model Agilent 81656A Sensor Module Report No.________ Date ________________

Te s t
No. Center Wavelength Min. Spec. Result Max. Spec.

IAccuracy Test

measured at _______ nm
(1550nm)

II Spectral Bandwidth (rms)

measured at _______ nm
(1550 nm)

III

IV Power Stability

Output Power [dBm]

measured at _______ nm
(1550 nm)

1535 nm _______ 1565 nm

13 dBm < _______

[nm]

[nm]

_______ < 7.5 nm

[dB] [dB]

Measurement
Uncertainty

measured at _______ nm
(1550 nm)

Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition 61

_______ < 0.01

Performance Tests Performance Test

62 Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition

Performance Test Performance Tests

Performance Test for the Agilent 81657A

Page 1 of 3

Model Agilent 81657A

Laser Source Module (1310/1550 nm)

Serial No. _________________________ Ambient Temperature ___________

Options _________________________ Relative Humidity ___________ %

Firmware Rev. _________________________ Line Frequency ___________ Hz

Test Facility _________________________ Customer _________________________

Performed by _________________________ Report No _________________________

Special Notes ______________________________________________________________________

______________________________________________________________________

______________________________________________________________________

______________________________________________________________________

______________________________________________________________________

______________________________________________________________________

Date ___________

°C

______________________________________________________________________

______________________________________________________________________

Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition 63

Performance Tests Performance Test

Performance Test for the Agilent 81657A Test Equipment Used

Page 2 of 3

Description Model No. Trace No Cal. Due Date

1a Lightwave Multimeter (Std.) Agilent 8163A ____________ ___________

1b TLS Mainframe Agilent 8164A ____________ ___________

2a Opt. Head Interface Module HP 81533B ____________ ___________

2b Opt. Head Interface Module Agilent 81618A ____________ ___________

3a Optical Head HP 81525A ____________ ___________

3b Optical Head Agilent 81625A ____________ ___________

4 Optical Spectrum Analyzer HP 71452B ____________ ___________

5 ____________________________ ____________ ____________ ___________

6 ____________________________ ____________ ____________ ___________

7 ____________________________ ____________ ____________ ___________

8 ____________________________ ____________ ____________ ___________

9 ____________________________ ____________ ____________ ___________

10 ____________________________ ____________ ____________ ___________

11 ____________________________ ____________ ____________ ___________

12 ____________________________ ____________ ____________ ___________

Accessories # Product # Product # Product

Connector Adapters 1 81000AA

Backreflector Kit 1 8156A #203

Connector Adapters 1 81000AA

64 Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition

Performance Test Performance Tests

Performance Test for the Agilent 81657A

Page 3 of 3

Model Agilent 81657A Sensor Module Report No.________ Date ________________

Te s t
No. Center Wavelength

IAccuracy Test

measured at _______ nm
(1310 nm)

measured at _______ nm
(1550 nm)

II Spectral Bandwidth (rms)

measured at _______ nm
(1310 nm)

measured at _______ nm
(1550 nm)

III

Output Power [dBm]

Min.

Spec. Result

[nm]

1295 nm _______ 1325 nm

1535 nm _______ 1565 nm

[nm]

_______ < 5.5 nm

_______ < 7.5 nm

Max.

Spec.

Measurement

Uncertainty

measured at _______ nm
(1310 nm)

measured at _______ nm
(1550 nm)

IV Power Stability

measured at _______ nm
(1310 nm)

measured at _______ nm
(1550 nm)

Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition 65

13 dBm < _______

13 dBm < _______

[dB] [dB]

_______ < 0.01

_______ < 0.01

Performance Tests Performance Test

66 Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition

Cleaning Instructions

Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition 67

Cleaning Instructions

The following Cleaning Instructions contain some general safety

precautions, which must be observed during all phases of cleaning.

Consult your specific optical device manuals or guides for full

information on safety matters.

Please try, whenever possible, to use physically contacting connectors,
and dry connections. Clean the connectors, interfaces, and bushings
carefully after use.

If you are unsure of the correct cleaning procedure for your optical device, we
recommend that you first try cleaning a dummy or test device.

Agilent Technologies assume no liability for the customer’s failure to
comply with these requirements.

Cleaning Instructions for this Instrument

The Cleaning Instructions apply to a number of different types of

Optical Equipment. Table 2 lists the sections that are relevant to the

various modules that can be installed in this instrument.

Table 2 Cleaning Instructions for Modules

Modules Instruction

Optical Heads “How to clean instruments with an optical glass plate”

on page 81

Laser Source Modules “How to clean instruments with a physical contact

interface” on page 81

Tunable Laser Modules “How to clean instruments with a physical contact

interface” on page 81

Return Loss Modules “How to clean instruments with a physical contact

interface” on page 81

LED Source Modules “How to clean instruments with a physical contact

interface” on page 81

Agilent 81633A/4A
Power Sensor Modules

All other Power Sensor
Modules

If you must clean these modules, please refer the
module to the skilled personnel of Agilent’s service
team.

“How to clean instruments with a recessed lens
interface” on page 82

68 Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition

Safety Precautions Cleaning Instructions

Safety Precautions

Please follow the following safety rules:

• Do not remove instrument covers when operating.

• Ensure that the instrument is switched off throughout the cleaning

procedures.

• Use of controls or adjustments or performance of procedures other

than those specified may result in hazardous radiation exposure.

• Make sure that you disable all sources when you are cleaning any

optical interfaces.

• Under no circumstances look into the end of an optical device

attached to optical outputs when the device is operational. The

laser radiation is not visible to the human eye, but it can seriously

damage your eyesight.

• To prevent electrical shock, disconnect the instrument from the

mains before cleaning. Use a dry cloth, or one slightly dampened

with water, to clean the external case parts. Do not attempt to clean

internally.

• Do not install parts or perform any unauthorized modification to

optical devices.

• Refer servicing only to qualified and authorized personnel.

Why is it important to clean
optical devices ?

In transmission links optical fiber cores are about 9 µm (0.00035") in

diameter. Dust and other particles, however, can range from tenths to
hundredths of microns in diameter. Their comparative size means that
they can cover a part of the end of a fiber core, and as a result will
reduce the performance of your system.

Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition 69

Cleaning Instructions What do I need for proper cleaning?

Furthermore, the power density may burn dust into the fiber and
cause additional damage (for example, 0 dBm optical power in a single
mode fiber causes a power density of approximately 16 million W/m
If this happens, measurements become inaccurate and non-repeatable.

Cleaning is, therefore, an essential yet difficult task. Unfortunately,
when comparing most published cleaning recommendations, you will
discover that they contain several inconsistencies. In this section, we
want to suggest ways to help you clean your various optical devices,
and thus significantly improve the accuracy and repeatability of your
lightwave measurements.

2

What do I need for proper cleaning?

).

Some Standard Cleaning Equipment is necessary for cleaning your
instrument. For certain cleaning procedures, you may also require
certain Additional Cleaning Equipment.

Standard Cleaning Equipment

Before you can start your cleaning procedure you need the following

standard equipment:

• Dust and shutter caps

• Isopropyl alcohol

• Cotton swabs

• Soft tissues

•Pipe cleaner

• Compressed air

Dust and shutter caps

All of Agilent Technologies’ lightwave instruments are delivered with
either laser shutter caps or dust caps on the lightwave adapter. Any
cables come with covers to protect the cable ends from damage or
contamination.

70 Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition

What do I need for proper cleaning? Cleaning Instructions

We suggest these protected coverings should be kept on the equipment
at all times, except when your optical device is in use. Be careful when
replacing dust caps after use. Do not press the bottom of the cap onto
the fiber too hard, as any dust in the cap can scratch or pollute your
fiber surface.

If you need further dust caps, please contact your nearest Agilent
Technologies sales office.

Isopropyl alcohol

This solvent is usually available from any local pharmaceutical
supplier or chemist’s shop.

If you use isopropyl alcohol to clean your optical device, do not
immediately dry the surface with compressed air (except when you
are cleaning very sensitive optical devices). This is because the dust
and the dirt is solved and will leave behind filmy deposits after the
alcohol is evaporated. You should therefore first remove the alcohol
and the dust with a soft tissue, and then use compressed air to blow
away any remaining filaments.

If possible avoid using denatured alcohol containing additives.
Instead, apply alcohol used for medical purposes.

Never try to drink this alcohol, as it may seriously damage to your
health.

Do not use any other solvents, as some may damage plastic materials
and claddings. Acetone, for example, will dissolve the epoxy used with
fiber optic connectors. To avoid damage, only use isopropyl alcohol.

Cotton swabs

We recommend that you use swabs such as Q-tips or other cotton
swabs normally available from local distributors of medical and
hygiene products (for example, a supermarket or a chemist’s shop).
You may be able to obtain various sizes of swab. If this is the case,
select the smallest size for your smallest devices.

Ensure that you use natural cotton swabs. Foam swabs will often leave
behind filmy deposits after cleaning.

Use care when cleaning, and avoid pressing too hard onto your optical
device with the swab. Too much pressure may scratch the surface, and
could cause your device to become misaligned. It is advisable to rub
gently over the surface using only a small circular movement.

Swabs should be used straight out of the packet, and never used twice.
This is because dust and dirt in the atmosphere, or from a first
cleaning, may collect on your swab and scratch the surface of your
optical device.

Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition 71

Cleaning Instructions What do I need for proper cleaning?

Soft tissues

These are available from most stores and distributors of medical and
hygiene products such as supermarkets or chemists’ shops.

We recommend that you do not use normal cotton tissues, but multi­layered soft tissues made from non-recycled cellulose. Cellulose
tissues are very absorbent and softer. Consequently, they will not
scratch the surface of your device over time.

Use care when cleaning, and avoid pressing on your optical device
with the tissue. Pressing too hard may lead to scratches on the surface
or misalignment of your device. Just rub gently over the surface using
a small circular movement.

Use only clean, fresh soft tissues and never apply them twice. Any dust
and dirt from the air which collects on your tissue, or which has
gathered after initial cleaning, may scratch and pollute your optical
device.

Pipe cleaner

Pipe cleaners can be purchased from tobacconists, and come in
various shapes and sizes.The most suitable one to select for cleaning
purposes has soft bristles, which will not produces scratches.

There are many different kinds of pipe cleaner available from tobacco
shops.

The best way to use a pipe cleaner is to push it in and out of the device
opening (for example, when cleaning an interface). While you are
cleaning, you should slowly rotate the pipe cleaner.

Only use pipe cleaners on connector interfaces or on feed through
adapters. Do not use them on optical head adapters, as the center of a
pipe cleaner is hard metal and can damage the bottom of the adapter.

Your pipe cleaner should be new when you use it. If it has collected
any dust or dirt, this can scratch or contaminate your device.

The tip and center of the pipe cleaner are made of metal. Avoid
accidentally pressing these metal parts against the inside of the device,
as this can cause scratches.

Compressed air

Compressed air can be purchased from any laboratory supplier.

It is essential that your compressed air is free of dust, water and oil.
Only use clean, dry air. If not, this can lead to filmy deposits or
scratches on the surface of your connector. This will reduce the
performance of your transmission system.

72 Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition

What do I need for proper cleaning? Cleaning Instructions

When spraying compressed air, hold the can upright. If the can is held
at a slant, propellant could escape and dirty your optical device. First
spray into the air, as the initial stream of compressed air could contain
some condensation or propellant. Such condensation leaves behind a
filmy deposit.

Please be friendly to your environment and use a CFC-free aerosol.

Additional Cleaning Equipment

Some Cleaning Procedures need the following equipment, which is not

required to clean each instrument:

• Microscope with a magnification range about 50X up to 300X

• Ultrasonic bath

• Warm water and liquid soap

• Premoistened cleaning wipes

• Polymer film

• Infrared Sensor Card

Microscope with a magnification range about 50X up to
300X

A microscope can be found in most photography stores, or can be
obtained through or specialist mail order companies. Special fiber­scopes are available from suppliers of splicing equipment.

Ideally, the light source on your microscope should be very flexible.
This will allow you to examine your device closely and from different
angles.

A microscope helps you to estimate the type and degree of dirt on your
device. You can use a microscope to choose an appropriate cleaning
method, and then to examine the results. You can also use your
microscope to judge whether your optical device (such as a connector)
is severely scratched and is, therefore, causing inaccurate
measurements.

Ultrasonic bath

Ultrasonic baths are also available from photography or laboratory
suppliers or specialist mail order companies.

An ultrasonic bath will gently remove fat and other stubborn dirt from
your optical devices. This helps increase the life span of the optical
devices.

Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition 73

Cleaning Instructions What do I need for proper cleaning?

Only use isopropyl alcohol in your ultrasonic bath, as other solvents
may damage.

Warm water and liquid soap

Only use water if you are sure that there is no other way of cleaning
your optical device without corrosion or damage. Do not use hot
water, as this may cause mechanical stress, which can damage your
optical device.

Ensure that your liquid soap has no abrasive properties or perfume in
it. You should also avoid normal washing-up liquid, as it can cover
your device in an iridescent film after it has been air-dried.

Some lenses and mirrors also have a special coating, which may be
sensitive to mechanical stress, or to fat and liquids. For this reason we
recommend you do not touch them.

If you are not sure how sensitive your device is to cleaning, please
contact the manufacturer or your sales distributor.

Premoistened cleaning wipes

Use pre-moistened cleaning wipes as described in each individual
cleaning procedure. Cleaning wipes may be used in every instance
where a moistened soft tissue or cotton swab is applied.

Polymer film

Polymer film is available from laboratory suppliers or specialist mail
order companies.

Using polymer film is a gentle method of cleaning extremely sensitive
devices, such as reference reflectors and mirrors.

Infrared Sensor Card

Infrared sensor cards are available from laboratory suppliers or
specialist mail order companies.

With this card you are able to control the shape of laser light emitted.
The invisible laser beam is projected onto the sensor card, then
becomes visible to the normal eye as a round spot.

Take care never to look into the end of a fiber or any other optical
component, when they are in use. This is because the laser can
seriously damage your eyes.

74 Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition

Preserving Connectors Cleaning Instructions

Preserving Connectors

Listed below are some hints on how best to keep your connectors in
the best possible condition.

Making Connections Before you make any connection you must ensure that all cables and

connectors are clean. If they are dirty, use the appropriate cleaning
procedure.

When inserting the ferrule of a patchcord into a connector or an
adapter, make sure that the fiber end does not touch the outside of the
mating connector or adapter. Otherwise you will rub the fiber end
against an unsuitable surface, producing scratches and dirt deposits
on the surface of your fiber.

Dust Caps and Shutter Caps Be careful when replacing dust caps after use. Do not press the bottom

of the cap onto the fiber as any dust in the cap can scratch or dirty
your fiber surface.

Immersion Oil and Other Index

Matching Compounds

When you have finished cleaning, put the dust cap back on, or close
the shutter cap if the equipment is not going to be used immediately.

Keep the caps on the equipment always when it is not in use.

All of Agilent Technologies’ lightwave instruments and accessories are
shipped with either laser shutter caps or dust caps. If you need
additional or replacement dust caps, contact your nearest Agilent
Technologies Sales/Service Office.

Where it is possible, do not use immersion oil or other index matching
compounds with your device. They are liable to impair and dirty the
surface of the device. In addition, the characteristics of your device
can be changed and your measurement results affected.

Cleaning Instrument Housings

Use a dry and very soft cotton tissue to clean the instrument housing
and the keypad. Do not open the instruments as there is a danger of
electric shock, or electrostatic discharge. Opening the instrument can
cause damage to sensitive components, and in addition your warranty
will be voided.

Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition 75

Cleaning Instructions Which Cleaning Procedure should I use ?

Which Cleaning Procedure
should I use ?

Light dirt If you just want to clean away light dirt, observe the following

procedure for all devices:

• Use compressed air to blow away large particles.

• Clean the device with a dry cotton swab.

• Use compressed air to blow away any remaining filament left by the

swab.

Heavy dirt If the above procedure is not enough to clean your instrument, follow

one of the procedures below. Please consult “Cleaning Instructions
for this Instrument” on page 68 for the procedure relevant for this

instrument.

If you are unsure of how sensitive your device is to cleaning, please
contact the manufacturer or your sales distributor

How to clean connectors

Cleaning connectors is difficult as the core diameter of a single-mode
fiber is only about 9µm. This generally means you cannot see streaks
or scratches on the surface. To be certain of the condition of the
surface of your connector and to check it after cleaning, you need a
microscope.

In the case of scratches, or of dust that has been burnt onto the surface
of the connector, you may have no option but to polish the connector.
This depends on the degree of dirtiness, or the depth of the scratches.
This is a difficult procedure and should only be performed by skilled
personal, and as a last resort as it wears out your connector.

WARNING Never look into the end of an optical cable that is connected to an

active source.

76 Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition

How to clean connector adapters Cleaning Instructions

To assess the projection of the emitted light beam you can use an
infrared sensor card. Hold the card approximately 5 cm from the
output of the connector. The invisible emitted light is project onto the
card and becomes visible as a small circular spot.

Preferred Procedure Use the following procedure on most occasions.

1 Clean the connector by rubbing a new, dry cotton-swab over the

surface using a small circular movement.

2 Blow away any remaining lint with compressed air.

Procedure for Stubborn Dirt Use this procedure particularly when there is greasy dirt on the

connector:

1 Moisten a new cotton-swab with isopropyl alcohol.

2 Clean the connector by rubbing the cotton-swab over the surface

using a small circular movement.

3 Take a new, dry soft-tissue and remove the alcohol, dissolved

sediment and dust, by rubbing gently over the surface using a small

circular movement.

4 Blow away any remaining lint with compressed air.

An Alternative Procedure A better, more gentle, but more expensive cleaning procedure is to use

an ultrasonic bath with isopropyl alcohol.

1 Hold the tip of the connector in the bath for at least three minutes.

2 Take a new, dry soft-tissue and remove the alcohol, dissolved

sediment and dust, by rubbing gently over the surface using a small

circular movement.

3 Blow away any remaining lint with compressed air.

How to clean connector adapters

CAUTION Some adapters have an anti-reflection coating on the back to reduce

back reflection. This coating is extremely sensitive to solvents and
mechanical abrasion. Extra care is needed when cleaning these
adapters.

Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition 77

Cleaning Instructions How to clean connector interfaces

Preferred Procedure Use the following procedure on most occasions.

1 Clean the adapter by rubbing a new, dry cotton-swab over the

surface using a small circular movement.

2 Blow away any remaining lint with compressed air.

Procedure for Stubborn Dirt Use this procedure particularly when there is greasy dirt on the

adapter:

1 Moisten a new cotton-swab with isopropyl alcohol.

2 Clean the adapter by rubbing the cotton-swab over the surface using

a small circular movement.

3 Take a new, dry soft-tissue and remove the alcohol, dissolved

sediment and dust, by rubbing gently over the surface using a small

circular movement.

4 Blow away any remaining lint with compressed air.

How to clean connector interfaces

CAUTION Be careful when using pipe-cleaners, as the core and the bristles of the

pipe-cleaner are hard and can damage the interface.

Do not use pipe-cleaners on optical head adapters, as the hard core of
normal pipe cleaners can damage the bottom of an adapter.

Preferred Procedure Use the following procedure on most occasions.

1 Clean the interface by pushing and pulling a new, dry pipe-cleaner

into the opening. Rotate the pipe-cleaner slowly as you do this.

2 Then clean the interface by rubbing a new, dry cotton-swab over the

surface using a small circular movement.

3 Blow away any remaining lint with compressed air.

Procedure for Stubborn Dirt Use this procedure particularly when there is greasy dirt on the

interface:

1 Moisten a new pipe-cleaner with isopropyl alcohol.

78 Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition

How to clean bare fiber adapters Cleaning Instructions

2 Clean the interface by pushing and pulling the pipe-cleaner into the

opening. Rotate the pipe-cleaner slowly as you do this.

3 Moisten a new cotton-swab with isopropyl alcohol.

4 Clean the interface by rubbing the cotton-swab over the surface

using a small circular movement.

5 Using a new, dry pipe-cleaner, and a new, dry cotton-swab remove

the alcohol, any dissolved sediment and dust.

6 Blow away any remaining lint with compressed air.

How to clean bare fiber adapters

Bare fiber adapters are difficult to clean. Protect from dust unless they
are in use.

CAUTION Never use any kind of solvent when cleaning a bare fiber adapter as

solvents can damage the foam inside some adapters.

They can deposit dissolved dirt in the groove, which can then dirty the
surface of an inserted fiber.

Preferred Procedure Use the following procedure on most occasions.

1 Blow away any dust or dirt with compressed air.

Procedure for Stubborn Dirt Use this procedure particularly when there is greasy dirt on the

adapter:

1 Clean the adapter by pushing and pulling a new, dry pipe-cleaner into the

opening. Rotate the pipe-cleaner slowly as you do this.

CAUTION Be careful when using pipe-cleaners, as the core and the bristles of

the pipe-cleaner are hard and can damage the adapter.

2 Clean the adapter by rubbing a new, dry cotton-swab over the

surface using a small circular movement.

3 Blow away any remaining lint with compressed air.

Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition 79

Cleaning Instructions How to clean lenses

How to clean lenses

Some lenses have special coatings that are sensitive to solvents,
grease, liquid and mechanical abrasion. Take extra care when cleaning
lenses with these coatings.

Lens assemblies consisting of several lenses are not normally sealed.
Therefore, use as little alcohol as possible, as it can get between the
lenses and in doing so can change the properties of projection.

Preferred Procedure Use the following procedure on most occasions.

1 Clean the lens by rubbing a new, dry cotton-swab over the surface

using a small circular movement.

2 Blow away any remaining lint with compressed air.

Procedure for Stubborn Dirt Use this procedure particularly when there is greasy dirt on the lens:

1 Moisten a new cotton-swab with isopropyl alcohol.

2 Clean the lens by rubbing the cotton-swab over the surface using a

small circular movement.

3 Using a new, dry cotton-swab remove the alcohol, any dissolved

sediment and dust.

4 Blow away any remaining lint with compressed air.

How to clean instruments with a fixed connector interface

You should only clean instruments with a fixed connector interface
when it is absolutely necessary. This is because it is difficult to remove
any used alcohol or filaments from the input of the optical block.

It is important, therefore, to keep dust caps on the equipment at all
times, except when your optical device is in use.

If you do discover filaments or particles, the only way to clean a fixed
connector interface and the input of the optical block is to use
compressed air.

80 Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition

How to clean instruments with an optical glass plate Cleaning Instructions

If there are fluids or fat in the connector, please refer the instrument

to the skilled personnel of Agilent’s service team.

CAUTION Only use clean, dry compressed air. Make sure that the air is free of

dust, water, and oil. If the air that you use is not clean and dry, this
can lead to filmy deposits or scratches on the surface of your
connector interface. This will degrade the performance of your
transmission system.

Never try to open the instrument and clean the optical block by
yourself, because it is easy to scratch optical components, and cause
them to be misaligned.

How to clean instruments with an optical glass plate

Some instruments, for example, the optical heads from Agilent
Technologies have an optical glass plate to protect the sensor. Clean
this glass plate in the same way as optical lenses (see “How to clean

lenses” on page 80).

How to clean instruments with a physical contact interface

Remove any connector interfaces from the optical output of the
instrument before you start the cleaning procedure.

Cleaning interfaces is difficult as the core diameter of a single-mode

fiber is only about 9 µm. This generally means you cannot see streaks

or scratches on the surface. To be certain of the degree of pollution on
the surface of your interface and to check whether it has been
removed after cleaning, you need a microscope.

Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition 81

Cleaning Instructions How to clean instruments with a recessed lens interface

WARNING Never look into an optical output, because this can seriously damage

your eyesight.

To assess the projection of the emitted light beam you can use an
infrared sensor card. Hold the card approximately 5 cm from the
interface. The invisible emitted light is project onto the card and
becomes visible as a small circular spot.

Preferred Procedure Use the following procedure on most occasions.

1 Clean the interface by rubbing a new, dry cotton-swab over the

surface using a small circular movement.

2 Blow away any remaining lint with compressed air.

Procedure for Stubborn Dirt Use this procedure particularly when there is greasy dirt on the

interface:

1 Moisten a new cotton-swab with isopropyl alcohol.

2 Clean the interface by rubbing the cotton-swab over the surface

using a small circular movement.

3 Take a new, dry soft-tissue and remove the alcohol, dissolved

sediment and dust, by rubbing gently over the surface using a small

circular movement.

4 Blow away any remaining lint with compressed air.

How to clean instruments with a recessed lens interface

WARNING For instruments with a deeply recessed lens interface (for example the

Agilent 81633A and 81634A Power Sensors) do NOT follow ths
procedure. Alcohol and compressed air could damage your lens even
further.

Keep your dust and shutter caps on, when your instrument is not in
use. This should prevent it from getting too dirty. If you must clean
such instruments, please refer the instrument to the skilled personnel

of Agilent’s service team.

82 Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition

How to clean optical devices which are sensitive to mechanical stress and pressure Cleaning Instructions

Preferred Procedure Use the following procedure on most occasions.

1 Blow away any dust or dirt with compressed air. If this is not

sufficient, then

2 Clean the interface by rubbing a new, dry cotton-swab over the

surface using a small circular movement.

3 Blow away any remaining lint with compressed air.

Procedure for Stubborn Dirt Use this procedure particularly when there is greasy dirt on the

interface, and using the procedure for light dirt is not sufficient. Using

isopropyl alcohol should be your last choice for recessed lens

interfaces because of the difficulty of cleaning out any dirt that is

washed to the edge of the interface:

1 Moisten a new cotton-swab with isopropyl alcohol.

2 Clean the interface by rubbing the cotton-swab over the surface

using a small circular movement.

3 Take a new, dry soft-tissue and remove the alcohol, dissolved

sediment and dust, by rubbing gently over the surface using a small

circular movement.

4 Blow away any remaining lint with compressed air.

How to clean optical devices which are sensitive to mechanical stress and pressure

Some optical devices, such as the Agilent 81000BR Reference
Reflector, which has a gold plated surface, are very sensitive to
mechanical stress or pressure. Do not use cotton-swabs, soft-tissues or
other mechanical cleaning tools, as these can scratch or destroy the
surface.

Preferred Procedure Use the following procedure on most occasions.

1 Blow away any dust or dirt with compressed air.

Procedure for Stubborn Dirt To clean devices that are extremely sensitive to mechanical stress or

pressure you can also use an optical clean polymer film. This

Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition 83

Cleaning Instructions How to clean metal filters or attenuator gratings

procedure is time-consuming, but you avoid scratching or destroying

the surface.

1 Put the film on the surface and wait at least 30 minutes to make

sure that the film has had enough time to dry.

2 Remove the film and any dirt with special adhesive tapes.

Alternative Procedure For these types of optical devices you can often use an ultrasonic bath

with isopropyl alcohol. Only use the ultrasonic bath if you are sure

that it won’t cause any damage anything to the device.

1 Put the device into the bath for at least three minutes.

2 Blow away any remaining liquid with compressed air.

If there are any streaks or drying stains on the surface, repeat the
cleaning procedure.

How to clean metal filters or attenuator gratings

This kind of device is extremely fragile. A misalignment of the grating
leads to inaccurate measurements. Never touch the surface of the
metal filter or attenuator grating. Be very careful when using or
cleaning these devices. Do not use cotton-swabs or soft-tissues, as
there is the danger that you cannot remove the lint and that the device
will be destroyed by becoming mechanically distorted.

Preferred Procedure Use the following procedure on most occasions.

1 Use compressed air at a distance and with low pressure to remove

any dust or lint.

Procedure for Stubborn Dirt Do not use an ultrasonic bath as this can damage your device.

Use this procedure particularly when there is greasy dirt on the

device:

1 Put the optical device into a bath of isopropyl alcohol, and wait at

least 10 minutes.

2 Remove the f luid using compressed air at some distance and with

low pressure. If there are any streaks or drying stains on the

surface, repeat the whole cleaning procedure.

84 Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition

Additional Cleaning Information Cleaning Instructions

Additional Cleaning Information

The following cleaning procedures may be used with other optical

equipment:

• How to clean bare fiber ends

• How to clean large area lenses and mirrors

How to clean bare fiber ends

Bare fiber ends are often used for splices or, together with other

optical components, to create a parallel beam. The end of a fiber can

often be scratched. You make a new cleave. To do this:

1 Strip off the cladding.

2 Take a new soft-tissue and moisten it with isopropyl alcohol.

3 Carefully clean the bare fiber with this tissue.

4 Make your cleave and immediately insert the fiber into your bare

fiber adapter in order to protect the surface from dirt.

How to clean large area lenses and mirrors

Some mirrors, as those from a monochromator, are very soft and
sensitive. Therefore, never touch them and do not use cleaning tools
such as compressed air or polymer film.

Some lenses have special coatings that are sensitive to solvents,
grease, liquid and mechanical abrasion. Take extra care when cleaning
lenses with these coatings.

Lens assemblies consisting of several lenses are not normally sealed.
Therefore, use as little liquid as possible, as it can get between the
lenses and in doing so can change the properties of projection.

Preferred Procedure Use the following procedure on most occasions.

1 Blow away any dust or dirt with compressed air.

Procedure for Stubborn Dirt Use this procedure particularly when there is greasy dirt on the lens:

Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition 85

Cleaning Instructions Additional Cleaning Information

CAUTION Only use water if you are sure that your device does not corrode.

Do not use hot water as this can lead to mechanical stress, which

can damage your device.

Make sure that your liquid soap has no abrasive properties or

perfume in it, because they can scratch and damage your device.

Do not use normal washing-up liquid as sometimes an iridescent

film remains.

1 Moisten the lens or the mirror with water.

2 Put a little liquid soap on the surface and gently spread the liquid

over the whole area.

3 Wash off the emulsion with water, being careful to remove it all, as

any remaining streaks can impair measurement accuracy.

4 Take a new, dry soft-tissue and remove the water, by rubbing gently

over the surface using a small circular movement.

5 Blow away remaining lint with compressed air.

Alternative Procedure A To clean lenses that are extremely sensitive to mechanical stress or

pressure you can also use an optical clean polymer film. This

procedure is time-consuming, but you avoid scratching or destroying

the surface.

1 Put the film on the surface and wait at least 30 minutes to make

sure that the film has had enough time to dry.

2 Remove the film and any dirt with special adhesive tapes.

Alternative Procedure B If your lens is sensitive to water then:

1 Moisten the lens or the mirror with isopropyl alcohol.

2 Take a new, dry soft-tissue and remove the alcohol, dissolved

sediment and dust, by rubbing gently over the surface using a small

circular movement.

3 Blow away remaining lint with compressed air.

86 Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition

Other Cleaning Hints Cleaning Instructions

Other Cleaning Hints

Selecting the correct cleaning method is an important element in
maintaining your equipment and saving you time and money. This
Appendix highlights the main cleaning methods, but cannot address
every individual circumstance.

This section contain some additional hints which we hope will help
you further. For further information, please contact your local Agilent
Technologies representative.

Making the connection Before you make any connection you must ensure that all lightwave

cables and connectors are clean. If not, then use appropriate the
cleaning methods.

When you insert the ferrule of a patchcord into a connector or an
adapter, ensure that the fiber end does not touch the outside of the
mating connector or adapter. Otherwise, the fiber end will rub up
against something which could scratch it and leave deposits.

Lens cleaning papers Note that some special lens cleaning papers are not suitable for

Immersion oil and other index

matching compounds

Cleaning the housing and the

mainframe

cleaning optical devices like connectors, interfaces, lenses, mirrors
and so on. To be absolutely certain that a cleaning paper is applicable,
please ask the salesperson or the manufacturer.

Do not use immersion oil or other index matching compounds with
optical sensors equipped with recessed lenses. They are liable to dirty
the detector and impair its performance. They may also alter the
property of depiction of your optical device, thus rendering your
measurements inaccurate.

When cleaning either the mainframe or the housing of your
instrument, only use a dry and very soft cotton tissue on the surfaces
and the numeric pad.

Never open the instruments as they can be damaged. Opening the
instruments puts you in danger of receiving an electrical shock from
your device, and renders your warranty void.

Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition 87

Cleaning Instructions Other Cleaning Hints

88 Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition

Index

C

Connectors

angled contact 16
straight contact 16

I

Initial Safety Information 4

O

Optical Output 16

Optional features 19

P

Performance Tests

Agilent 81650A 39
Agilent 81651A 43
Agilent 81652A 47
Agilent 81654A 51
Agilent 81655A 55
Agilent 81656A 59
Agilent 81657A 63
Center Wavelength 35
Output Power 36
Output Stability 36
Required Equipment 33
Spectral Bandwidth 35
Test Failure 33

Performance tests 32

S

Index

Safety

information for laser source 4

Single-mode module 32

Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition 89

90Agilent 81650A/1A/2A/4A/5A/6A/7A User’s Guide, Third Edition

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