Keysight 81630B User manual

Keysight 81630B/4B/6B Power
Sensor Modules and
Keysight 81635A Dual Power
Sensor Module
User’s Guide

Notices
© Keysight Technologies 2000 - 2015
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Manual Part Number
81635-90B12
Edition
Edition 4, February 2015
Edition 3, July 2005
Edition 2, January 2002
Edition 1, July 2001
Subject Matter
The material in this document is
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liable for errors contained herein or for
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in connection with the furnishing,
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Printing History
New editions are complete revisions of
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representative.
Control Serial Number: First Edition
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Warranty
This Keysight 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, Keysight
will, at its option, either repair or
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defective.
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Limitation of Warranty
The foregoing warranty shall not apply
to defects resulting from improper or
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specifically disclaims the implied
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Assistance
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Certification
Keysight Technologies certifies that
this product met its published
specifications at the time of shipment
from the factory.
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that its calibration measurements are
traceable to the United States National
Institute of Standards and Technology,
NIST to the extent allowed by the
Institutes’s calibration facility, and to
the calibration facilities of other
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objective of continually increasing
customer satisfaction through
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Keysight Technologies Sales and Service
Offices
For more information about Keysight Technologies test and measurement
products, applications, services, and for a current sales office listing, visit
our web site:
http://www.keysight.com/find/lightwave
You can also contact one of the following centers and ask for a test and
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Keysight 81630B/4B/6B Power Sensor Modules and Keysight 81635A Dual Power Sensor Module, Edition 4 5
Table of Contents
Getting Started with Power Sensor Modules 9
Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Safety Symbols. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Initial Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Line Power Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Operating Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Storage and Shipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
What is a Power Sensor Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
A Description of the Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Analog Output. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Optical Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Accessories 15
Modules and Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Connector Interfaces. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Bare Fiber Adapters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Specifications 19
Definition of Terms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Averaging Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Linearity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Linewidth. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Power range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Reference conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Offset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Relative uncertainty (spectral ripple) due to interference . . . . .24
Relative uncertainty due to polarization . . . . . . . . . . . . . . . . . . . . . . . 24
Return loss: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Spectral width of optical source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Total uncertainty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Uncertainty at reference conditions . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Wavelength Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

6 Keysight 81630B/4B/6B Power Sensor Modules and Keysight 81635A Dual Power Sensor Module, Edition 4
Power Sensor Specifications (Autorange Mode) . . . . . . . . . . 26
Keysight 81635A & 81634B Specification . . . . . . . . . . . . . . . . . . . . . . . 26
Keysight 81636B Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Keysight 81630B Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Supplementary Performance Characteristics. . . . . . . . . . . . . . . 32
Analog Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Performance Tests 33
Equipment Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Test Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Test Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Instrument Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Performance Test Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Accuracy Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Te s t S e t u p . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Linearity Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Te s t S e t u p . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
+10 dBm Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
0 dBm Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
-10 dBm Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
-20 dBm Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
-30 dBm Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Change Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
-40 dBm Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
-50 dBm Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Calculation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Example: Measurement Results. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Calculations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Noise Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Return Loss Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Relative Uncertainty due to Polarization (Optional Test) . . . . . . 51
Relative Uncertainty due to Interference (Optional Test). . . . . . 53
Test Record Sheets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Cleaning Instructions 71
Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Why is it important to clean optical devices ? . . . . . . . . . . . . . . 73

Keysight 81630B/4B/6B Power Sensor Modules and Keysight 81635A Dual Power Sensor Module, Edition 4 7
What do I need for proper cleaning?. . . . . . . . . . . . . . . . . . . . . . . . . . 74
Standard Cleaning Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .74
Dust and shutter caps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Isopropyl alcohol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Cotton swabs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75
Soft tissues . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Pipe cleaner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .76
Compressed air . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .76
Additional Cleaning Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77
Microscope with a magnification range about 50X up to 300X. . . . . .77
Ultrasonic bath . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Warm water and liquid soap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Premoistened cleaning wipes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .78
Polymer film . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Infrared Sensor Card. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .78
Preserving Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79
Cleaning Instrument Housings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80
Which Cleaning Procedure should I use ? . . . . . . . . . . . . . . . . . . .80
How to clean connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .81
How to clean connector interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . .83
How to clean bare fiber adapters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .84
How to clean lenses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
How to clean instruments with a fixed connector interface . . . 86
How to clean instruments with a recessed lens interface . . . . . 87
How to clean optical devices which are sensitive to mechanical
stress and pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .88
Additional Cleaning Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .89
How to clean bare fiber ends . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
How to clean large area lenses and mirrors . . . . . . . . . . . . . . . . . . . 90
Other Cleaning Hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .92
Index 93

8 Keysight 81630B/4B/6B Power Sensor Modules and Keysight 81635A Dual Power Sensor Module, Edition 4

1
Getting Started with Power Sensor
Modules
This chapter introduces the features of the Keysight 81630B/4B/6B
Power Sensor Modules and the 81635A Dual Power Sensor Module.
Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Safety Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Initial Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Line Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Operating Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Storage and Shipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Environmental Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
What is a Power Sensor Module. . . . . . . . . . . . . . . . . . . . . 13
A Description of the Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . 13
Analog Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Optical Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Getting Started with Power Sensor Modules Safety Considerations
10 Keysight 81630B/4B/6B Power Sensor Modules and Keysight 81635A Dual Power Sensor Module, Edition 4
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. Keysight Technologies 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.
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.
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
WARNING

Safety Considerations Getting Started with Power Sensor Modules
Keysight 81630B/4B/6B Power Sensor Modules and Keysight 81635A Dual Power Sensor Module, Edition 4 11
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 Keysight Technologies Sales/Service Office.
Line Power Requirements
The Keysight 81630B/4B/6B Power Sensor Modules and Keysight 81635A
Dual Power Sensor Module operate when installed in the 8163A/B
Lightwave Multimeter, 8164A/B Lightwave Measurement System, and
8166A/B Lightwave Multichannel System.
Operating Environment
The safety information in the 8163A/B Lightwave Multimeter, 8164A/B
Lightwave Measurement System, and 8166A/B Lightwave Multichannel
System User’s Guide summarizes the operating ranges for the
Keysight 81630B/4B/6B Power Sensor Modules and Keysight 81635A
Dual Power Sensor Module. In order for these modules to meet
specifications, the operating environment must be within the limits
specified for the 8163B Lightwave Multimeter, 8164B Lightwave
Measurement System, and 8166B Lightwave Multichannel System.
Storage and Shipment
This module can be stored or shipped at temperatures between
−40°C and +70°C. Protect the module from temperature extremes that may
cause condensation within it.
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.).
WARNING

Getting Started with Power Sensor Modules Safety Considerations
12 Keysight 81630B/4B/6B Power Sensor Modules and Keysight 81635A Dual Power Sensor Module, Edition 4
Environmental Information
This product complies with the 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 the 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/take-
back.shtml for more information.

What is a Power Sensor Module Getting Started with Power Sensor Modules
Keysight 81630B/4B/6B Power Sensor Modules and Keysight 81635A Dual Power Sensor Module, Edition 4 13
What is a Power Sensor Module
A Power Sensor Module measures the power emitted from a connected
single-mode or multi-mode fiber (with Numerical Aperture ≤ 0.24/0.3 and
core diameter up to 100 μm according to the model). The wavelength and
power range depend on the sensor element.
A Description of the Front Panel
Figure 1 Front Panel of the Keysight Power Sensor Modules

Getting Started with Power Sensor Modules What is a Power Sensor Module
14 Keysight 81630B/4B/6B Power Sensor Modules and Keysight 81635A Dual Power Sensor Module, Edition 4
Analog Output
The analog output is the BNC connector on the front of the sensor module.
It outputs a voltage directly proportional to the strength of the optical
signal at the optical input in the current range. The analog signal is always
in the range between 0 and 2V, 2V corresponding to a full power input
signal in the current range, 0V corresponding to no input signal.
During autoranging, the level to which 2V corresponds changes. You
should disable autoranging when using the analog output.
Disabling Autoranging
Select the best range for the application using the mainframe user
interface. Select <Menu>, <Range Mode>, <Manual> and then choose
from the list of ranges.
Applications
Possible applications for the analog output are:
• to close the feedback loop controlling the current supplied to a laser
• to aid positioning the system for fiber alignment tasks
• to monitor optical power on an oscilloscope
The analog signal reacts instantaneously to the input signal, whereas the
power shown on the display is subject to averaging. The analog bandwidth
of the signal is given in the Supplementary Performance Characteristics.
Optical Input
The optical input to the sensor requires a connector interface (or bare fiber
adapter) to match the connector type (or bare fiber) to the sensor. See
“Accessories” on page 15 for details.
Operation
For operation instructions, please refer to the User Guide and
Programming Guide for the 816x mainframes.

2
Accessories
The Keysight 81630B/4B/6B Power Sensor Module and the
Keysight 81635A Dual Power Sensor Module 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.
Modules and Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Connector Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Bare Fiber Adapters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Accessories Modules and Options
16 Keysight 81630B/4B/6B Power Sensor Modules and Keysight 81635A Dual Power Sensor Module, Edition 4
Modules and Options
Figure 2 Recommended Connector Interfaces and Bare Fiber Adapters

Modules and Options Accessories
Keysight 81630B/4B/6B Power Sensor Modules and Keysight 81635A Dual Power Sensor Module, Edition 4 17
Connector Interfaces
Note for LC or MU connectors:
The sensors are optimized for use with 2.5 mm ferrule connectors, for
which the positioning is most repeatable. For use with LC or MU
connectors with 1.25 mm ferrules, please consider the following:
• For the 81634B and 81630B, only the 81002LI for LC or 81002MI for MU
should be used. The 81000LI and 81000MI should not be used. But posi-
tioning uncertainty with the 81002LI or 81000MI can still degrade abso-
lute power uncertainty by up to ± 1dB, considering worst-case offsets
within the tolerances of the connectors and adapters.
• The 81635A and 81636B sensor inputs make an off-center contact with
the ferrule, so the 81000LI and 81000MI, which allow physical contact,
give good positioning repeatability.
• For LC and MU connectors, use of the 8162x optical power heads or
N7744A and N7745A power meters with corresponding adapters are rec-
ommended for highest accuracy.
Ferrules with conical or raised end faces also add positioning uncertainty
and are not recommended for use with the power sensor modules.
Sensors can be used with both straight and angled-polish connectors.
Table 1 Connector Interfaces
Product Number Connector Interface Type
81000FI FC
81000KI SC
81000LI LC (81635A or 81636B only)
81002LI LC (81630B or 81634B)
81000MI MU (81635A or 81636B only)
81002MI MU (81630B or 81634B)
81000PI E-2000
81000SI DIN 47526
81000VI ST

Accessories Modules and Options
18 Keysight 81630B/4B/6B Power Sensor Modules and Keysight 81635A Dual Power Sensor Module, Edition 4
Bare Fiber Adapters
Table 2 Connector Interface and Bare Fiber Adapter Combinations
Product Number Bare Fiber Adapter Note
81000BI Bare Fiber Kit for
81630B/81634B
81004BH Bare Fiber Holder Set 0-400μm
81009BH Bare Fiber Holder Set 400-900μm