Keysight Technologies 81663A User manual

User Guide
Keysight 81663A
DFB Laser Source Module

Notices
© Keysight Technologies 2017
No part of this manual may be reproduced
in any form or by any means (including
electronic storage and retrieval or transla-
tion 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
81661-90A15
Edition
Edition 10.0, January 2017
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 soft-
ware is customarily provided to the public.
Accordingly, Keysight provides the Soft-
ware to U.S. government customers under
its standard commercial license, which is
embodied in its End User License Agree-
ment (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 Key-
sight: (1) Furnish technical information
related to commercial computer software
or commercial computer software docu-
mentation that is not customarily provided
to the public; or (2) Relinquish to, or other-
wise provide, the government rights in
excess of these rights customarily provided
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mercial 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 appli-
cable 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
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INCIDENTAL OR CONSEQUENTIAL
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TERMS COVERING THE MATERIAL IN THIS
DOCUMENT THAT CONFLICT WITH THESE
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SEPARATE AGREEMENT WILL CONTROL.
Safety Notices
CAUTION
A CAUTION notice denotes a hazard. It
calls attention to an operating proce-
dure, 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 pro-
ceed beyond a CAUTION notice until
the indicated conditions are fully
understood and met.
WARNING
A WARNING notice denotes a hazard. It
calls attention to an operating proce-
dure, 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.
2Keysight DFB Laser Source Module User’s Guide

Keysight DFB Laser Source Module User’s Guide 3
Contents
1 Getting Started with DFB Laser Sources
Safety Considerations 8
Safety Symbols 8
Initial Inspection 8
Line Power Requirements 9
Operating Environment 9
Storage and Shipment 9
Environmental Information 9
Initial Safety Information for Laser Source Modules 10
Laser Safety Labels 11
Laser Class 1M 11
What is a Laser Source Module? 12
A Description of the Front Panel 12
Optical Output 13
Operation Note 15
Maintaining Wavelength Accuracy Below Maximum Power 15
Keysight Technologies Sales and Service Offices 17
2 Accessories
Recommended Connector Interfaces 20
Wavelength Options 21
3 Performance Tests
Equipment Required 24
Test Record 25

4Keysight DFB Laser Source Module User’s Guide
Contents
Test Failure 26
Instrument Specification 27
Performance Test Instructions 28
All Wavelength Tests 28
Wavelength Repeatability Test 28
Wavelength Stability Test 29
Test Records 30
Test Records 33
4 Cleaning Information
Cleaning Instructions for this Instrument 37
Safety Precautions 38
Why is it important to clean optical devices? 39
What do I need for proper cleaning? 40
Standard Cleaning Equipment 40
Additional Cleaning Equipment 43
Preserving Connectors 45
Cleaning Instrument Housings 46
Which Cleaning Procedure should I use? 47
Light dirt 47
Heavy dirt 47
How to clean connectors 48
Preferred Procedure 48
Procedure for Stubborn Dirt 49
An Alternative Procedure 49
How to clean connector adapters 50
Preferred Procedure 50
Procedure for Stubborn Dirt 50

Keysight DFB Laser Source Module User’s Guide 5
Contents
How to clean connector interfaces 51
Preferred Procedure 51
Procedure for Stubborn Dirt 51
How to clean bare fiber adapters 52
Preferred Procedure 52
Procedure for Stubborn Dirt 52
How to clean lenses 53
Preferred Procedure 53
Procedure for Stubborn Dirt 53
How to clean instruments with a fixed connector interface 54
How to clean instruments with an optical glass plate 55
How to clean instruments with a physical contact interface 56
Preferred Procedure 56
Procedure for Stubborn Dirt 56
How to clean instruments with a recessed lens interface 58
Preferred Procedure 58
Procedure for Stubborn Dirt 58
How to clean optical devices which are sensitive to mechanical
stress and pressure 59
Preferred Procedure 59
Procedure for Stubborn Dirt 59
Alternative Procedure 59
How to clean metal filters or attenuator gratings 60
Preferred Procedure 60
Procedure for Stubborn Dirt 60
Additional Cleaning Information 61
How to clean bare fiber ends 61
How to clean large area lenses and mirrors 61

6Keysight DFB Laser Source Module User’s Guide
Contents
Other Cleaning Hints 63
Making the connection 63
Lens cleaning papers 63
Immersion oil and other index matching compounds 63
Cleaning the housing and the mainframe 64
5 Specifications
Definition of Terms 66
Wavelength tuning range 66
Wavelength display resolution 66
Wavelength repeatability 66
Wavelength stability 67
Max. output power 67
Power CW stability 67
Sidemode suppression ratio (SMSR) 68
Polarization extinction ratio (PER) 68
Coherence control 68
Modulation, digital 68
ON- switching with fast output power stabilization 69
Tuning Speed 69
DFB Source Module Specifications 70
Supplementary Performance Characteristics 71

Keysight 81663A DFB Laser Source Module
User’s Guide
1Getting Started with
DFB Laser Sources
Safety Considerations / 8
Initial Safety Information for Laser Source Modules / 10
Laser Safety Labels / 11
What is a Laser Source Module? / 12
Operation Note / 15
Keysight Technologies Sales and Service Offices / 17
This chapter introduces the features of the Keysight 81663A DFB Laser
Source Module.

8Keysight DFB Laser Source Module User’s Guide
1 Getting Started with DFB Laser Sources
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 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.
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 Keysight Technologies Sales/Service Office.
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.

Keysight DFB Laser Source Module User’s Guide 9
Getting Started with DFB Laser Sources 1
Line Power Requirements
The Keysight 81663A DFB Laser Source Module operates when installed in
the 8163A/B Lightwave Multimeter,8164A/B Lightwave Measurement
System, or 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
81663A DFB Laser Source Module. In order for this module to meet
specifications, the operating environment must be within the limits
specified for the mainframe.
Storage and Shipment
The 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.
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/ takeback.shtml
for more information
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.).
WARNING
You MUST return instruments with malfunctioning laser modules to a
Keysight Technologies Service Center for repair and calibration.

10 Keysight DFB Laser Source Module User’s Guide
1 Getting Started with DFB Laser Sources
Initial Safety Information for Laser Source Modules
The laser sources specified by this user guide are classified according to
IEC 60825- 1 (2007).
The laser sources comply with 21 CFR 1040.10 except for deviations
pursuant to Laser Notice No. 50, dated 2007- June- 24.
Table 1 DFB Laser Source Modules Laser Safety Information
Laser Safety Labels
Laser Class 1M
Figure 1 Laser Class 1M Safety Label - Keysight 81663A
Keysight 81663A
Laser type CW DFB Laser
with built-in isolator
Wavelength (±15nm) 1300 to 1650 nm
see display
Max. CW output power* <28 mW
Beam waist diameter 9 μm
Numerical aperture 0.1
Laser Class according to
IEC 60825-1 (2007)
1M
Max. permissible CW output power 163 mW
* Max. CW output power is defined as the highest possible optical power that the
laser source can produce at its output connector.