Keysight N7776C, N7778C, N7779C User Manual
Keysight N777-C Series
Tunable Laser Family
N7776C Tunable Laser Source
N7778C Tunable Laser Source
N7779C Tunable Laser Source
User’s Guide
Notices
CAUTION
WARNING
© Keysight Technologies 2021
No part of this manual may be reproduced
in any form or by any means (including
electronic storage and retrieval or translation into a foreign language) without prior
agreement and written consent from
Keysight Technologies as governed by
United States and international copyright
laws.
Manual Part Number
N7770-90B02
Edition
Edition 2.1, February 2021
Keysight Technologies Deutschland GmbH
Herrenberger Strasse 130,
71034 Böblingen, Germany
Technology Licenses
The hardware and/or software described in
this document are furnished under a
license and may be used or copied only in
accordance with the terms of such license.
U.S. Government Rights
The Software is “commercial computer
software,” as defined by Federal Acquisition
Regulation (“FAR”) 2.101. Pursuant to FAR
12.212 and 27.405-3 and Department of
Defense FAR Supplement
(“DFARS”) 227.7202, the U.S. government
acquires commercial computer software
under the same terms by which the
software is customarily provided to the
public. Accordingly, Keysight provides the
Software to U.S. government customers
under its standard commercial license,
which is embodied in its End User License
Agreement (EULA), a copy of which can
be found at:
http://www.keysight.com/find/sweula.
The license set forth in the EULA represents
the exclusive authority by which the U.S.
government may use, modify, distribute, or
disclose the Software. The EULA and the
license set forth therein, does not require
or permit, among other things, that
Keysight: (1) Furnish technical information
related to commercial computer software
or commercial computer software
documentation that is not customarily
provided to the public; or (2) Relinquish to,
or otherwise provide, the government
rights in excess of these rights customarily
provided to the public to use, modify,
reproduce, release, perform, display, or
disclose commercial computer software or
commercial computer software documentation. No additional government requirements beyond those set forth in the EULA
shall apply, except to the extent that those
terms, rights, or licenses are explicitly
required from all providers of commercial
computer software pursuant to the FAR and
the DFARS and are set forth specifically in
writing elsewhere in the EULA. Keysight
shall be under no obligation to update,
revise or otherwise modify the Software.
With respect to any technical data as
defined by FAR 2.101, pursuant to FAR
12.211 and 27.404.2 and DFARS 227.7102,
the U.S. government acquires no greater
than Limited Rights as defined in FAR
27.401 or DFAR 227.7103-5 (c), as
applicable in any technical data.
Warranty
THE MATERIAL CONTAINED IN THIS
DOCUMENT IS PROVIDED "AS IS," AND IS
SUBJECT TO BEING CHANGED, WITHOUT
NOTICE, IN FUTURE EDITIONS. FURTHER,
TO THE MAXIMUM EXTENT PERMITTED BY
APPLICABLE LAW, KEYSIGHT DISCLAIMS
ALL WARRANTIES, EITHER EXPRESS OR
IMPLIED WITH REGARD TO THIS MANUAL
AND ANY INFORMATION CONTAINED
HEREIN, INCLUDING BUT NOT LIMITED TO
THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE. KEYSIGHT SHALL
NOT BE LIABLE FOR ERRORS OR FOR
INCIDENTAL OR CONSEQUENTIAL
DAMAGES IN CONNECTION WITH THE
FURNISHING, USE, OR PERFORMANCE OF
THIS DOCUMENT OR ANY INFORMATION
CONTAINED HEREIN. SHOULD KEYSIGHT
AND THE USER HAVE A SEPARATE
WRITTEN AGREEMENT WITH WARRANTY
TERMS COVERING THE MATERIAL IN THIS
DOCUMENT THAT CONFLICT WITH THESE
TERMS, THE WARRANTY TERMS IN THE
SEPARATE AGREEMENT WILL CONTROL.
Safety Notices
A CAUTION notice denotes a hazard.
It calls attention to an operating
procedure, practice, or the like that,
if not correctly performed or adhered
to, could result in damage to the
product or loss of important data.
Do not proceed beyond a CAUTION
notice until the indicated conditions
are fully understood and met.
A WARNING notice denotes a hazard.
It calls attention to an operating
procedure, practice, or the like that,
if not correctly performed or adhered
to, could result in personal injury or
death. Do not proceed beyond a
WARNING notice until the indicated
conditions are fully understood and
met.
2 Keysight N777-C Series Tunable Laser Family User’s Guide
Safety Summary
General This product is a Protection Class 1 instrument (provided with a protective earth terminal)
The following general safety precautions must be observed during all phases of operation
of this instrument. Failure to comply with these precautions or with specific warnings or
operating instructions in the product manuals violates safety standards of design,
manufacture, and intended use of the instrument. Keysight Technologies assumes no
liability for the customer's failure to comply with these requirements. Product manuals
are provided on the Web. Go to www.keysight.com and type in your product number in
the Search field at the top of the page.
and has been manufactured and tested according to international safety standards. The
protective features of this product may be impaired if it is used in a manner not specified
in the operation instructions.
All Light Emitting Diodes (LEDs) used in this product are Class 1 LEDs as per
IEC 60825-1:2014.
Environment Conditions
Tempe rat ure
Before Applying Power
Ground the Instrument
Do Not Operate in an
Explosive Atmosphere
This instrument is intended for indoor use in an Overvoltage Category II, pollution degree
2 environment. It is designed to operate at a maximum relative humidity (RH) of 80%,
non-condensing and at altitudes of up to 2000 meters. Refer to the specifications tables
for the AC mains voltage requirements and ambient operating temperature range.
The instrument should be protected from temperature extremes and changes in
temperature that may cause condensation within it.
The operating temperature is from 10 °C to +35 °C
The storage temperature is from –40 °C to +70 °C (Option D00, standard front panel)
___________________________ __ –30 °C to +70 °C (Option D01, touchscreen display)
Verify that all safety precautions are taken. The power cable inlet of the instrument serves
as a device to disconnect from the mains in case of hazard. The instrument must be
positioned so that the operator can easily access the power cable inlet. When the
instrument is rack mounted the rack must be provided with an easily accessible mains
switch.
To minimize shock hazard, the instrument chassis and cover must be connected to an
electrical protective earth ground. The instrument must be connected to the AC power
mains through a grounded power cable, with the ground wire firmly connected to an
electrical ground (safety ground) at the power outlet. Any interruption of the protective
(grounding) conductor or disconnection of the protective earth terminal will cause a
potential shock hazard that could result in personal injury.
Do not operate the instrument in the presence of flammable gases or fumes.
Do Not Remove the
Instrument Cover
Keysight N777-C Series Tunable Laser Family User’s Guide 3
Operating personnel must not remove instrument covers. Component replacement and
internal adjustments must be made only by qualified personnel.
Instruments that appear damaged or defective should be made inoperative and secured
against unintended operation until they can be repaired by qualified service personnel.
Instrument Markings
Instrument Marking Description
The instruction manual symbol. The product is marked with this warning symbol when it
is necessary for the user to refer to the instructions in the manual.
Standby supply. Unit is not completely disconnected from AC mains when switch is
off.
The CE mark is a registered trademark of the European Community.
The CSA mark with the 'c' and 'us' subscript indicates the instrument is certified to the
applicable Canadian and United States of America standards respectively.
The RCM mark is a registered trademark of the Australian Communications and Media
Authority
This symbol is a South Korean Class A EMC Declaration, with the product identification
code "R-R-Kst-3E18526".
R - Identification of authorization prefix.
R - Identification of basic certification information.
Kst - Identification of applicant's information
3E18526 - Product identification.
This is a Class A instrument suitable for professional use and in electromagnetic
environment outside of the home.
The recycling symbol indicates the general ease with which the instrument can be
recycled.
China Restricted Substance Product Label. The EPUP (environmental protection use
period) number in the center indicates the time period during which no hazardous
or toxic substances or elements are expected to leak or deteriorate during normal
use and generally reflects the expected useful life of the product.
4 Keysight N777-C Series Tunable Laser Family User’s Guide
South Korean Class A EMC Declaration
ۉࡅ߄έה
ࢇЕ߶הࡈˁ߾۰یࡈଟּࢶࡳԻࢶଢ۽ૡɼձ؇ࡵԻ۰ɼࢽࡈˁ߾۰ی
ࡈଜЕˁࡉࢷળɾۺࢂࡉԮɼݡТЬ
یࡈ ߇ΰחࡵ߶הࡈ ؏ܞݦࢢ߾փ ࢶࡈଞЬ
Information to the user:
This instrument has been conformity assessed for used in business environments. In a
residential environment this equipment may caused radio interference.
This EMC statement applies to the equipment only for use in business environment.
Compliance and Environmental Information
Table 1 Compliance and Environmental Information
Safety Symbol Description
This product complies with WEEE Directive (2002/96/EC) marking requirements.
The affixed label indicates that you must not discard this electrical/electronic
product in domestic household waste.
Product Category: With reference to the equipment types in WEEE Directive Annex I,
this product is classed as a “Monitoring and Control instrumentation” product.
Do not dispose in domestic household waste.
To return unwanted products, contact your local Keysight office, or see
http://about.keysight.com/en/companyinfo/environment/takeback.shtml for more
information.
Declaration of Conformity
Declarations of Conformity for this product and for the Keysight products may be
downloaded from the Web. Go to http://www.keysight.com/go/conformity.
You can then search by product number to find the latest Declaration of Conformity.
Keysight N777-C Series Tunable Laser Family User’s Guide 5
Contents
1 General Operating Considerations
Safety Summary 3
Instrument Markings 4
South Korean Class A EMC Declaration 5
Compliance and Environmental Information 5
Declaration of Conformity 5
Overview 14
Laser Safety Information 15
Initial Safety Information for Keysight N777-C Family Lasers 15
Laser Safety Labels 16
Laser Safety Symbols 17
Operating Environment 18
Handling the Instrument 20
Storage and Shipment 20
Carrying the Instrument 20
Rack Mount the Instrument 20
Obtaining Source Code 22
2 Getting Started
Initial Inspection 24
Initial Inspection 24
Claims and Repackaging 24
Return Shipments to Keysight Technologies 24
Deleting User Data 25
Keysight N777-C Series Tunable Laser Family User’s Guide 7
Contents
Power Supply Requirements 26
Line Power Requirements 26
N777-C Series of Tunable Laser Family 28
The Keysight N7776C Top-Line Tunable Laser Source 28
The Keysight N7778C Value Line Tunable Laser Sources 28
The Keysight N7779C Basic Line Step-Tunable Laser Source 29
O-band option for Silicon Photonics/ Integrated Photonics
Applications
E-band option for CWDM8 Component Testing 29
29
N777-C Front and Rear Panel 30
Input/Output Signals 31
Optical Output 32
LAN Interface 34
The LAN LED 34
The LAN Reset button 34
USB Interface 35
Powering Up the Instrument 36
Connecting the Instrument 37
Connecting over USB 37
Connecting over LAN 38
N777-C User Interface 41
3 Definition of Terms
Definition of Terms 44
General Definitions 44
Absolute wavelength accuracy (continuous sweep mode) 45
Absolute wavelength accuracy (stepped mode) 45
Dynamic power reproducibility (continuous sweep mode) 45
Dynamic relative power flatness (continuous sweep mode) 46
Effective linewidth 46
8 Keysight N777-C Series Tunable Laser Family User’s Guide
Linewidth 47
Maximum output power 47
Mode-hop free tunability 48
Operating temperature and humidity 48
Output isolation 48
Polarization extinction ratio 48
Power flatness versus wavelength 49
Power linearity 50
Power repeatability 50
Power stability 51
Relative intensity noise (RIN) 51
Relative wavelength accuracy (continuous sweep mode) 52
Relative wavelength accuracy (stepped mode) 52
Return loss 53
Side-mode suppression ratio 53
Signal to source spontaneous emission (SSE) ratio 54
Signal to total source spontaneous emission ratio 55
Wavelength range 55
Wavelength repeatability (continuous sweep mode) 55
Wavelength repeatability (stepped mode) 56
Wavelength resolution 57
Wavelength stability 57
Contents
4 N777-C Web Interface Reference
N777-C Web Interface 60
Controlling N777-C Instruments 62
Control Instrument Tab 62
How to set Wavelength? 65
How to Set Power? 65
How to Perform a Wavelength Sweep? 66
How to Use Triggers? 70
How to set Modulation? 71
How to Lock/Unlock the Instrument? 72
How to Turn ON/OFF the Laser? 73
Keysight N777-C Series Tunable Laser Family User’s Guide 9
Contents
How to Use Auxiliary Functions 74
How to Get Current Instrument Settings? 74
How to Identity a Particular instrument? 75
How to Capture an Image of the Graph? 75
How to Save/Recall the Web Interface Settings? 75
Logging In/Out of the N777-C Web Interface 76
How to Create/Change the Password? 77
What If You Forget Your Password? 77
How to perform Realignment? 77
Lambda Zeroing 78
Update Rate 79
Reboot Device 80
How to Configure LAN? 80
5 N777-C Instrument’s Front Panel Display
N777-C Instrument’s Front Panel Display 86
Controlling N777-C Instruments 88
Control Instrument Window 88
How to set Wavelength? 91
How to Set Power? 92
How to Perform a Wavelength Sweep? 93
How to Use Triggers? 97
How to set Modulation? 100
How to Lock/Unlock the Instrument? 101
How to Turn ON/OFF the Laser Output? 101
How to Get Current Instrument Settings? 101
How to Configure LAN? 103
10 Keysight N777-C Series Tunable Laser Family User’s Guide
6 Maintenance
Contents
Cleaning Instructions 108
Safety Precautions 108
Why is it important to clean optical devices? 108
What materials do I need for proper cleaning? 109
General Cleaning Procedure 111
Further Cleaning Information 112
Firmware Upgrades 113
Requirements 113
Contact Keysight Technologies 114
Keysight N777-C Series Tunable Laser Family User’s Guide 11
Keysight N777-C Series Tunable Laser Family
User’s Guide
1 General Operating
Considerations
Overview / 14
Laser Safety Information / 15
Operating Environment / 18
Handling the Instrument / 20
Obtaining Source Code / 22
1 General Operating Considerations
WARNING
WARNING
WARNING
Overview
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. Keysight Technologies assumes no liability for the
customer’s failure to comply with these requirements.
Ensure the proper usage for the instrument. The protection provided
by the instrument may be impaired. The operator of this instrument is
advised to use the equipment in a manner as specified in this document
Before operation, you should review the instrument and manual for safety
markings and instructions. You must follow these to ensure safe operation
and to maintain the instrument in safe condition.
Some circuits are powered whenever the instrument is connected to the
AC power source. To disconnect from the line power, disconnect the
power cord either at the rear power inlet or at the AC line power source
(receptacle). One of these must always be accessible. If the instrument is
in a cabinet, it must be disconnected from the line power by the system’s
line power switch.
14 Keysight N777-C Series Tunable Laser Family User’s Guide
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.).
Please pay attention to the following laser safety warning:
Under no circumstances look into the end of an optical cable attached to
the optical output when the instrument 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. Refer servicing only
to qualified and authorized personnel.
Laser Safety Information
Initial Safety Information for Keysight N777-C Family Lasers
General Operating Considerations 1
The laser sources specified by this user’s guide are classified according to
IEC 60825-1:2014.
The laser sources comply with 21 CFR 1040.10 except for deviations
pursuant to Laser Notice No. 50 dated 2007, June 24.
Table 2 Laser Source Specification
N7776C #216
N7778C #216
N7779C #216
Laser type EC-Laser
Wavelength range 1450 – 1650 nm 1440 – 1640 nm 1490 – 1640 nm 1340 – 1495 nm 1240 – 1380 nm
Max. CW output power
Beam waist diameter 9 µm 9 µm 9 µm 9 µm 9 µm
Numerical aperture 0.1 0.1 0.1 0.1 0.1
Laser class according to
IEC 60825-1:2014
Max. permissible CW output
power
* Max. CW output power is defined as the highest possible optical power that the laser source can produce at its output connector.
InGaAsP
*
< 25 mW < 25 mW < 25 mW < 60 mW < 30 mW
1M 1M 1M 1M 1M
163 mW 163 mW 163 mW 163 – 500 mW 55 – 500 mW
N7778C #215 N7776C #116
EC-Laser
InGaAsP
N7778C #116
N7779C #116
EC-Laser
InGaAsP
N7776C #114
N7778C #114
N7779C #114
EC-Laser
InGaAsP
N7776C #113
N7778C #113
N7779C #113
EC-Laser
InGaAsP
Keysight N777-C Series Tunable Laser Family User’s Guide 15
1 General Operating Considerations
WARNING
Laser Safety Labels
Laser Class 1M Label
Figure 1 Laser Class 1M Label
A sheet of laser safety labels is included with the laser instrument. In order
to meet the requirements of IEC 60825-1:2014, 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.
Please pay attention to the following laser safety warning:
Under no circumstances look into the end of an optical cable attached to
the optical output when the instrument 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. The laser can be
enabled by pressing the “active” button close to the optical output
connector on the front panel of the instrument or by remote control. The
laser is on when the green LED, above the optical output, on the front
panel of the instrument is lit. The use of optical instruments with this
product will increase eye hazard. The laser instrument has a 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.
16 Keysight N777-C Series Tunable Laser Family User’s Guide
Laser 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.
Invisible laser radiation.
General Operating Considerations 1
Keysight N777-C Series Tunable Laser Family User’s Guide 17
1 General Operating Considerations
WARNING
Operating Environment
Overview
In order for the instrument to meet specifications, the operating
environment must be within these limits. Refer to Safety Summary on
page 3.
The instrument is not designed for outdoor use. To prevent potential fire
or shock hazard, do not expose the instrument to rain or other excessive
moisture.
Instrument Cooling
The instrument has a cooling fan mounted internally.
Mount or position your instrument upright and horizontally, as shown in
the following figure so that air can circulate through it freely.
18 Keysight N777-C Series Tunable Laser Family User’s Guide
Operating Position
When operating the instrument choose a location that provides at least
75 mm (3 inches) of clearance at the rear, and at least 25 mm (1 inch) of
clearance at each side. Failure to provide adequate air clearance may
result in excessive internal temperature, reducing instrument reliability.
The instrument should not be operated when resting on its rear or side
panels.
Figure 2 shows the correct operating position of Keysight N777-C
instrument.
General Operating Considerations 1
25 mm
(1 inch)
25 mm
(1 inch)
75 mm
(3 inches)
Figure 2 Operating Position of the Instrument
Keysight N777-C Series Tunable Laser Family User’s Guide 19
1 General Operating Considerations
Strap
NOTE
Handling the Instrument
Storage and Shipment
Carrying the Instrument
Lasers can be stored or shipped at temperatures between –40 °C to +70 °C
(Option D00, standard front panel) and between –30 °C to +70 °C (Option
D01, touchscreen display). Protect the laser from temperature extremes
that may cause condensation within it.
The Keysight N777-C Tunable Laser System can be stored either in its
operating position or on its back legs. The back legs protect the
connectors on the back panel from damage.
Grasp the strap to carry the instrument.
Figure 3 Carrying an Instrument
Rack Mount the Instrument
You can mount the instrument in a standard 19-inch rack cabinet using an
optional kit, which includes instructions and mounting hardware.
Remove the carrying strap, and the front and rear rubber bumpers feet,
before mounting the instrument in a rack.
20 Keysight N777-C Series Tunable Laser Family User’s Guide
General Operating Considerations 1
To rack mount a single instrument, order adapter kit N7799C-2CM.
Figure 4 shows an example where an instrument is mounted on a rack:
Figure 4 Instrument Mounted on a Rack
Keysight N777-C Series Tunable Laser Family User’s Guide 21
1 General Operating Considerations
Obtaining Source Code
This product uses open source packages. To the extent required by the
applicable open source license(s), Keysight makes source code available
upon request. To request source code, please contact Keysight Support at
www.keysight.com/main/support.jspx.
Third party software acknowledgments and licenses for the N777-C series
with the embedded Linux operating system are located at:
www.keysight.com/find/N7776C
.
22 Keysight N777-C Series Tunable Laser Family User’s Guide
Keysight N777-C Series Tunable Laser Family
User’s Guide
2 Getting Started
Initial Inspection / 24
Power Supply Requirements / 26
N777-C Series of Tunable Laser Family / 28
N777-C Front and Rear Panel / 30
LAN Interface / 34
Powering Up the Instrument / 36
Connecting the Instrument / 37
N777-C User Interface / 41
2 Getting Started
WARNING
Initial Inspection
Initial Inspection
Claims and Repackaging
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 Keysight Technologies Sales/Service Office.
You MUST return malfunctioning instruments to a Keysight Technologies
Sales/Service Center for repair and calibration.
If physical damage is evident or if the instrument does not meet
specification when received, notify the carrier and the nearest Keysight
Technologies Sales/Service Office. The Keysight Technologies Sales/
Service Office will arrange for repair or replacement of the unit without
waiting for settlement of the claim against the carrier.
Return Shipments to Keysight Technologies
If the instrument is to be shipped to an Keysight Technologies Sales/
Service Office, attach a tag showing owner, return address, model number
and full serial number and the type of service required.
The original shipping carton and packing material may be reusable, but
the Keysight Technologies Sales/Service Office will provide information
and recommendations on materials to be used if the original packing is no
longer available or reusable. General instructions for repackaging are as
follows:
• Wrap instrument in heavy paper or plastic.
• Use strong shipping container. A double wall carton made of
350-pound test material is adequate.
24 Keysight N777-C Series Tunable Laser Family User’s Guide
• Use enough shock absorbing material (3 to 4 inch / 7.5 to 10 cm layer)
• Seal shipping container securely.
• Mark shipping container FRAGILE to encourage careful handling.
• In any correspondence with Keysight, refer to the instrument by model
Deleting User Data
If you need to delete all your logged data and user configurations, press
and hold the LAN Reset button (approx. 5 seconds) to reset the instrument
and all your logged data and user configurations will be deleted.
Getting Started 2
around all sides of the instrument to provide a firm cushion and prevent
movement inside container. Protect control panel with cardboard.
number and serial number.
Keysight N777-C Series Tunable Laser Family User’s Guide 25
2 Getting Started
CAUTION
Power Supply Requirements
Line Power Requirements
Line Power Requirements
Line Power Cable
The instrument complies with Overvoltage Category II and can operate
from the single-phase AC power source that supplies between 100 V and
240 V at a frequency in the range 50/60 Hz. The maximum voltage
fluctuation is 10% of the nominal supply voltage. The maximum power
consumption is 200 VA with all options installed.
In accordance with international safety standards, the instrument has a
three-wire power cable. When connected to an appropriate AC power
receptacle, this cable earths the instrument cabinet.
Please note that the switch on the front panel of the instrument does not
stop the flow of power to the instrument.
If you need to turn off the power, unplug the instrument at the mains or
remove the power cable connector from the appliance coupler at the rear
of the instrument. For this reason, the power cable connection should be
easily accessible - allowing you to turn off the power quickly. If the
instrument is in a cabinet, it must be disconnected from the line power
by the system’s line power switch.
26 Keysight N777-C Series Tunable Laser Family User’s Guide
The power switch allows you to switch between stand-by mode and
power-on mode.
Figure 5 Power LED on the Front Panel of the Instrument
Getting Started 2
When the instrument is in stand-by mode, the Power LED is orange. When
the instrument is powered-on, the Power LED is green.
The AC power requirements are summarized on the rear panel of the
instrument.
Figure 6 AC Power Requirement Markings
Keysight N777-C Series Tunable Laser Family User’s Guide 27
2 Getting Started
N777-C Series of Tunable Laser Family
The Keysight Technologies N777-C Family of Tunable Laser Sources offers
the full wavelength range from 1240 nm to 1650 nm with no wavelength
gaps.
The N777-C tunable laser sources realize the cost efficiency and
performance required to test components for coarse and dense
wavelength division multiplexing (CWDM, DWDM, 100GBASE-LR4) and
passive optical networks (PON). Whether you need to verify the design of
demanding optical components or adjust more wavelength-selective
switches per hour, or you simply need a stable, tunable optical source, the
N777-C family of tunable lasers offers a suitable model.
All N777-C models are based on a common cavity and laser instrument
design and share a narrow linewidth, excellent long-term stability and low
spontaneous emission level. They are software compatible with the
8160xA and 81600B lasers, the industry standards for more than a decade,
but occupy 1 height unit less rack space.
For further details on its features, application and specifications, refer to
the product datasheet available on www.keysight.com.
28 Keysight N777-C Series Tunable Laser Family User’s Guide
The Keysight N7776C Top-Line Tunable Laser Source
The new Keysight N7776C top line tunable laser source is designed to
reach best-in-class accuracy and sub-picometer repeatability in static and
swept operation for outstanding test efficiency.
With the product family’s lowest spontaneous emission level, the N7776C
enables the validation of extremely deep filters. It also offers the best
wavelength accuracy in the family – enabled by its high-resolution
wavelength reference unit that provides real-time tracking and control and
includes a gas cell for excellent long-term stability and self-adjustment
capability.
The Keysight N7778C Value Line Tunable Laser Sources
The new N7778C value line tunable laser source offers a peak output
power of more than +12 dBm, at least 75 dB/nm above its spontaneous
emission level. It features a typical wavelength repeatability of ±1.5 pm at
two-way sweeps up to 200 nm/s. The N7778C’s balance of features,
performance and price makes it suitable for cost-effective,
high-throughput manufacturing-floor component testing as well as for
coherent transmission experiments.
The Keysight N7779C Basic Line Step-Tunable Laser Source
The new N7779C basic line tunable laser source, like the other new
N777-C models, can step quickly to discrete wavelengths with a resolution
of 0.1 pm and a typical wavelength repeatability of ±3 pm, making it ideal
for cost-effective testing of broadband optical devices. With wavelength
setting times like 300 ms, rapid stepped sweeps are possible. Like the
other lasers in the N777-C family, it delivers more than +12 dBm peak
output power with low spontaneous emission levels. At ±0.01 dB power
stability over an hour, it can also serve as a static local oscillator with a
wide tuning range for receiver testing or transmission experiments.
O-band option for Silicon Photonics/ Integrated Photonics Applications
The N777-C option 113 covers the wavelength range from 1240 nm to
1380 nm for an important set of applications. Equipped with PMF output
fiber, these are a good match for testing and developing components with
Silicon Photonics technology. Verifying the spectral responsivity and the
sensitivity of receiver optical subassemblies (ROSA) for 100G Ethernet
benefit from more than +10 dBm output power - enough to allow for
external modulation in BER testing. Combined with very low SSE levels,
Option 113 is ideal for testing wavelength filters for LR4 components.
Getting Started 2
E-band option for CWDM8 Component Testing
The N777-C option 114 covers the wavelength range from 1340 nm to
1495 nm. Combined with the other options, this allows measurements
over all CWDM channels, such as for CWDM8 devices. Components for
Raman amplification also use this wavelength range.
Keysight N777-C Series Tunable Laser Family User’s Guide 29
2 Getting Started
N777-C Front and Rear Panel
This section provides information on the front and rear panels of the
N777-C Series Tunable Laser Source.
Figure 7 shows the front panel of the N777-C Series Tunable Laser Source
with the optional display unit (Option D01):
Figure 7 Front Panel of the N777-C Instrument with Display
30 Keysight N777-C Series Tunable Laser Family User’s Guide
Figure 8 shows the front panel of the N777-C Series Tunable Laser Source
without the display (Option D00):
Figure 8 Front Panel of the N777-C Instrument without Display
Loading...