The Agilent 86120C Multi-Wavelength Meter is a Michelson interferometer-based instrument that measures
wavelength and optical power of laser light in the 1270 to 1650 nm wavelength range. Simultaneous measurements
of multiple laser lines are performed allowing measurements of DWDM signals and multiple lines of Fabry-Perot
lasers. Each laser line is assumed to have a linewidth (including modulation sidebands) of less than 5 GHz.
This technical specifications sheet describes the measurement accuracy and operating condition of the Agilent
86120C Multi-Wavelength Meter. The specifications apply to all functions over the temperature range 0 to 55° C
and relative humidity <95% (unless otherwise noted). All specifications apply after the instrument’s temperature has
been stabilized after 15 minutes continuous operation, and when the instrument is in NORMAL UPDATE mode.
Wavelength
Range
1270 to 1650 nm (182 to 236 THz)
Absolute accuracy, laser lines separated by ≥15 GHz
±2 ppm (±0.003 nm at 1550 nm and 1310 nm)
Differential accuracy
1
±1 ppm
Minimum resolvable separation
1,2
(equal power lines input)
10 GHz (0.08 nm at 1550 nm, 0.06 nm at 1300 nm)
Display resolution
0.001 nm
Power
Calibration accuracy
±0.5 dB (at ±30 nm from 1310 and 1550 nm)
Flatness, 30 nm from any wavelength
1270 to 1600 nm
1
±0.2 dB
1270 to 1650 nm
1
±0.5 dB
Linearity
3
±0.3 dB
Polarization dependence,
1270 to 1600 nm ±0.5 dB
1600 to 1650 nm
1
±1.0 dB
Display resolution 0.01 dB
1
Characteristic
2
For lines separated by less than 15 GHz, wavelength accuracy is reduced.
3
1270 to 1600 nm, lines above –30 dBm
Agilent 86120C
Multi-Wavelength Meter
Technical Specifications
2
Characteristics and Specifications
The distinction between specifications and characteristics is described as follows:
• Specifications describe warranted performance.
• Characteristics provide useful, but nonwarranted information about the functions and performance of the instrument.
Wavelength
• Range refers to the allowable wavelength range of the optical input signal.
• Absolute accuracy indicates the maximum wavelength error over the allowed environmental conditions.
• Differential accuracy indicates the maximum wavelength error in measuring the wavelength difference between
two signals that are simultaneously present.
• Minimum resolvable separation indicates the minimum wavelength separation of two laser lines input required
to measure each wavelength simultaneously. Two laser lines closer in wavelength than the minimum resolvable
separation are not resolved and one average wavelength is displayed.
• Display resolution indicates the minimum incremental change in displayed wavelength.
Power
• Calibration accuracy indicates the maximum power calibration error at the specified wavelengths over the
allowed environmental conditions.
• Flatness refers to the maximum amplitude error in a measurement between two lines that are separated in
wavelength by no more than the specified amount.
• Linearity indicates the maximum power error in measuring the change in power of one laser line.
• Polarization dependence indicates the maximum displayed power variation as the polarization of the input
signal is varied.
• Display resolution indicates the minimum incremental change in displayed power.
Sensitivity
• Sensitivity is defined as the minimum power level of a single laser line input to measure wavelength and power
accurately. A laser line with less than the minimum power may be measured but with reduced wavelength and
power accuracy. For multiple laser lines input, sensitivity may be limited by total input power.
Selectivity
• Selectivity indicates the ability to measure the wavelength and power of a weak laser line in the proximity of
a specified stronger laser line and separated by the specified amount.
Input Power
• Maximum displayed level indicates the maximum total input power (total of all laser lines present) to accurately
measure wavelength and power.
• Maximum safe input power indicates the maximum total input power (total of all laser lines present) to avoid
permanent optical damage to the instrument.
Maximum Number of Lines Input
• Maximum number of lines input is the maximum number of displayed lines. If more than 200 lines are input,
only the 200 longest wavelength lines are displayed.
Input Return Loss
• Input return loss indicates the optical power reflected back to the user’s fiber cable relative to the input power.
It is limited by the return loss of the front panel connector, and assumes the user’s connector is good.
Measurement Cycle Time
• Measurement cycle time refers to the cycle time when measuring wavelength and power of laser lines.
Specific advanced applications may require longer cycle times.
Definition of Terms
3
Sensitivity
4,5
1270 to 1600 nm, single line input –40 dBm
1600 to 1650 nm, single line input –30 dBm
1270 to 1650 nm, multiple lines input
1
30 dB below total input power, but not less than
single line input sensitivity
Selectivity
2 lines input separated by ≥50 GHz
1
25 dB
2 lines input separated by ≥15 GHz
1
10 dB
Input Power
Maximum displayed level (sum of all lines input)
+10 dBm
Maximum safe input level (sum of all lines input)
+18 dBm
Maximum Number of Laser Lines Input
200
Input Return Loss
With flat contacting connectors 35 dB
With angled contacting connectors (option 022) 50 dB
Measurement Cycle Time
Normal update mode
1
1.0 sec (1 measurement/sec)
Wavelength Units
nm (vacuum or standard air), cm–1, THz
Power Units
dBm, mW, µW
Measurement Modes
List by Wavelength Table, List by Power Table, Single Wavelength and Power, Average Wavelength and Total Power
Delta Modes
Delta Wavelength, Delta Power, Delta Wavelength and Power
Built in Automatic
Measurement Applications
Signal-to-noise ratio
1
0.1 nm noise bandwidth, lines above –25 dBm
>35 dB, channel spacing ≥100 GHz
>27 dB, channel spacing ≥50 GHz
Signal-to-noise ratio
1
of modulated lasers
(with averaging)
0.1 nm noise bandwidth, lines above –25 dBm
>35 dB with 100 averages, channel spacing ≥100 GHz
>27 dB with 100 averages, channel spacing ≥50 GHz
Drift
Maximum, minimum, total drift (max-min) of wavelengths and powers over time
Fabry-Perot characterization
Mean wavelength, Peak wavelength, Mode spacing,
Full-width at half maximum, Peak amplitude, Total
power, Sigma.
Additional Features
Power Offset, Power Bars (On or Off), user adjustable
Peak Excursion and Peak Threshold, user adjustable
Start and Stop wavelength limits, Graphical display,
Save and Recall instrument states.
Inputs/Outputs
Optical input
9/125 µm single-mode fiber
Rear panel connectors
GPIB, parallel printer port, AC Line
Dimensions and Weight
Dimensions
140 mm high x 340 mm wide x 465 mm deep
(5.5 in x 13.4 in x 18.3 in)
Weight
9 kg (19 lb)
Environmental
Operational Storage
Temperature 0° C to +55° C –40° C to +70° C
(warranted)
Humidity <95% R.H. at +40° C, Noncondensing
(type tested) 5 day soak 90% R.H. at +65° C
for 24 hrs.
Shock 300 g, half sine,
(type tested) 2 msec pulse
Vibration Random, 5 g rms
(type tested) 5 to 500 Hz, 10 min./axis
Sine, 0.75 g (0 to peak)
5 to 500 Hz, 1 octave/min.
EMC Conducted and radiated interference isin
compliance with CISPR Pub 11, IEC 801-2,
IEC 801-3, IEC 801-4 and IEC 555-2
Note: “type tested” means tested, but not warranted, for continuous operation.
Power Requirements
Voltage and frequency
88 to 269 VAC, 45 Hz to 440 Hz
Maximum power
70 watts max (125 VA max)
Specifications
1
Characteristic
2
For lines separated by less than 15 GHz, wavelength accuracy is reduced.
3
1270 to 1600 nm, lines above –30 dBm
4
Characteristic noise floor –60 dBm
5
Contact Agilent for availablity of special instruments with higher sensitivity.
Ordering Information
Agilent 86120C Multi-Wavelength Meter
Standard instrument includes a front-panel FC/PC optical
fiber connector interface and a user’s manual.
Connector options replacing the standard FC/PC
connector interface:
❑ Option 011 HMS-10
❑ Option 013 DIN
❑ Option 014 ST
❑ Option 017 SC
❑ Option 022 Replace flat physical contact interface
with angled physical contact interface
Additional connector interfaces can be ordered
separately:
❑ 81000AI Diamond HMS-10 connector interface
❑ 81000FI FC/PC/SPC/APC connector interface
❑ 81000GI D4 connector interface
❑ 81000KI SC connector interface
❑ 81000SI DIN 47256/4108.6 connector interface
❑ 81000VI ST connector interface
❑ 81000WI Biconic connector interface
Fixed external 10 dB attenuators:
❑ Option 412 FC/PC
❑ Option 417 FC/APC (requires Option 022)
Other options:
❑ Option UK5 Nylon carrying case with shoulder strap
❑ Option UK6 Commercial calibration certificate with
test data
❑ Option UK7 Hard carrying case
Ordering Information
For more information about Agilent Technologies
test and measurement products, applications,
services, and for a current sales office listing,
visit our web site,
www.agilent.com/comms/lightwave
You can also contact one of the
following centers and ask for a test and
measurement sales representative.
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Agilent Technologies
Test and Measurement Call Center
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(tel) 1 800 452 4844
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Agilent Technologies Canada Inc.
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L4W 5G1
(tel) 1 877 894 4414
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Test & Measurement
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P.O. Box 999
1180 AZ Amstelveen
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(tel) (31 20) 547 2000
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Agilent Technologies Japan Ltd.
Call Center
9-1, Takakura-Cho, Hachioji-Shi,
Tokyo 192-8510, Japan
(tel) (81) 426 56 7832
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Latin American Region Headquarters
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Technical data subject to change
Copyright © 1999
Agilent Technologies
Printed in U.S.A. 3/00
5968-1045E
INVISIBLE LASER RADIATION-AVOID
DIRECT EXPOSURE TO BEAM
FDA LASER CLASS I PRODUCT
IEC LASER CLASS 1 PRODUCT
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