Keysight Technologies 81940A User Manual
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Keysight Technologies 81940A User Manual

Keysight Technologies 81940A User Manual

Compact tunable laser source modules
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Keysight 81940A, 44A, 49A,
80A & 89A Compact Tunable
Laser Source Modules
User's Guide

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Summary of Contents for Keysight Technologies 81940A

  • Page 1 Keysight 81940A, 44A, 49A, 80A & 89A Compact Tunable Laser Source Modules User’s Guide...
  • Page 4 Notices © Keysight Technologies 2002 - 2015 Warranty Government users will receive no greater than Limited Rights as defined in FAR No part of this manual may be reproduced The material contained in this 52.227-14 (June 1987) or DFAR in any form or by any means (including document is provided “as is,”...
  • Page 5 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, viesit our web site: http://www.keysight.com/find/lightwave You can also contact one of the following centers and ask for a test and measurement sales representative.
  • Page 6 In This Guide... Chapter 1, “Getting Started. This chapter contains an introductory description of the modules and aims to make the modules familiar to you. Chapter 2, “Accessories. This chapter contains details of the various modules and options available. Chapter 3, “Specifications. This chapter contains the full performance specifications for the modules.

  • Page 7: Table Of Contents

    Signal Input and Output Accessories Modules and Options Modules Options Connector Interfaces User’s Guides Specifications Definition of Terms General Definitions Compact Tunable Laser Module Specifications Conditions Supplementary Performance Characteristics General Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 8 Why is it important to clean optical devices ? What do I need for proper cleaning? Preserving Connectors Cleaning Instrument Housings Which Cleaning Procedure should I use? How to clean connectors How to clean connector interfaces Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 9 How to clean bare fiber adapters How to clean instruments with a fixed connector interface Additional Cleaning Information Other Cleaning Hints Index Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 10 Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 11 Signal-to-source spontaneous emission ratio 83 Figure 31 Test Setup for Source Spontaneous Emission Test. 84 Figure 32 Total SSE Measurement. 86 Figure 33 Test Setup for Source Spontaneous Emission Test. 87 Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 12 Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 13: Getting Started

    Getting Started This chapter provides a general description of Keysight 81940A, 44A, 49A, 80A & 89A Tunable Laser Source Familys. Safety Considerations ......12 Safety Symbols .

  • Page 14: Safety Considerations

    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. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 15: Initial Inspection

    Keysight 81980A, 81940A, 81944A, 81989A and 81949A Compact Tunable Laser Source modules. In order for these modules to meet specifications, the operating environment must be within the limits specified for your mainframe. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 16: Input/Output Signals

    Laser Source 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. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 17: Initial Safety Information For Tunable Laser Modules

    * Max. CW output power is defined as the highest possible optical power that the laser source can produce at its output connector. ** Max. permissible CW output power is the highest optical power that is permitted within the appropriate laser class. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 18: Laser Safety Labels

    Laser Safety Labels Laser class 1M label Figure 1 Class 1M Safety Label - 81980A, 81940A, 81944A, 81980A, 81949A 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...

  • Page 19: Introduction

    DWDM components, and complete DWDM systems. Installation The Keysight 81940A, 44A, 49A, 80A & 89A Tunable Laser Source Familys are front-loadable modules. For a description of how to install your module, refer to “How to Fit and Remove Modules”...

  • Page 20: Figure 3 Keysight 81940A Compact Tunable Laser Modules

    Figure 3 Keysight 81940A Compact Tunable Laser Modules Keysight 81989A with Keysight 81989A with Straight Contact Connector Angled Contact Connector Figure 4 Keysight 81989A Compact Tunable Laser Modules Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 21: Figure 5 Keysight 81949A Compact Tunable Laser Modules

    GP-IB commands. When the Active LED is lit the source is emitting radiation. When the Active LED is not lit the source is not emitting radiation. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 22: Typical Use Models

    DWDM applications Device Characterization at high power levels The high optical output power of the Keysight 81940A, 44A, 49A, 80A & 89A Tunable Laser Source Family improves the testing of all types of optical amplifiers and other active components as well as broadband passive optical components.
  • Page 23 All 819xxA modules can be operated in the stepped mode, usually used where measurements are done at particular wavelength. The 81980A, 81940A and 81944A can also be operated in the continuous sweep mode with dynamic wavelength logging to make measurements during the wavelength sweep.

  • Page 24: Optical Output

    (8-µm Diameter) Stress Rods Slow Axis (Polarization Axis) Not to Scale Figure 6 PMF Output Connector Chapter 2, “Modules and Options for further details on connector interfaces and accessories. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 25: Angled And Straight Contact Connectors

    Angled non-contact fiber end connectors with orange sleeves cannot be N O TE directly connected to the instrument. “Connector Interfaces” on page 28 for further details on connector interfaces and accessories. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 26: Signal Input And Output

    Keysight 81940A, 44A, 49A, 80A & 89A Tunable Laser Source Familys. An absolute maximum of ± 6 V can be applied as an external voltage to any BNC connector. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 27: Accessories

    Accessories The Keysight 81940A, 44A, 49A, 80A & 89A Tunable Laser Source Family 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 ......26 Modules .

  • Page 28: Modules And Options

    Note: 819xxA - 072 is highly recommended over 819xxA - 071 to reduce front-panel reflections, which will greatly reduce interference noise and spectral ripple in the test setup. Figure 8 Mainframes, Tunable Laser Modules, and Options Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 29: Modules

    Modules and Options Accessories Modules Keysight 81940A, 44A, 49A, 80A & 89A Tunable Laser Source Family can be hosted by: • 8163A and 8163B Lightwave Multimeters, • 8164A and 8164B Lightwave Measurement Systems, • 8166A and 8166B Lightwave Multichannel Systems.

  • Page 30: Connector Interfaces

    Table 3 Angled Contact Connector Interfaces Description Model number E-2000 APC Keysight 81000 HI SC/APC Keysight 81000 KI FC/APC Keysight 81000 NI DIN 47256 / 4108.6 Keysight 81000 SI Connect your cable. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 31: User's Guides

    8163A/B Lightwave Multimeter, 8164A/B Lightwave 08164-90B15 Measurement System, & 8166A/B Lightwave Multichannel System User’s Guide. 8163A/B Lightwave Multimeter, 8164A/B Lightwave 08164-90B64 Measurement System, & 8166A/B Lightwave Multichannel System Programming Guide. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 32 Accessories User’s Guides Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 33: Specifications

    Specifications Keysight 81940A, 44A, 49A, 80A & 89A Tunable Laser Source Family are produced to the ISO 9001 international quality system standard as part of Keysight’s commitment to continually increasing customer satisfaction through improved quality control. Definition of Terms....... . . 32 General Definitions.

  • Page 34: Definition Of Terms

    Wavelength stability ........45 Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 35 (at 10% of its original value). Conditions: Modulation input signal and duty cycle as specified, modulation frequency as specified. Measurement: Using a photoreceiver (of sufficient bandwidth) and an oscilloscope. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 36 Rise time specifies the time for the optical pulse to rise from 10% to 90% of its final power value. Conditions: Modulation frequency as specified. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 37 (Lightwave signal analyzer settings: resolution bandwidth 1 MHz, video bandwidth 10 kHz, sweep time 20 ms, single scan). Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 38: Figure 9 Maximum Output Power Vs. Wavelength, Maximum Flat Output Power

    To ensure constant speed within the chosen wavelength range the N O T E actual wavelength range is automatically expanded by the tunable laser source to account for acceleration and deceleration effects Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 39 The insertion loss of the built-in isolator in the backward direction. Measurement: This characteristic cannot be measured from outside the module. It is based on known isolator characteristics. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 40: Figure 10 Circular Traces On The Poincaré Sphere Used To Calculate Polarization Extinction Ratio

    Poincaré sphere. Calculate the polarization extinction ratio from the diameters of these circles. Figure 10 Circular traces on the Poincaré sphere used to calculate polarization extinction ratio. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 41: Figure 11 Power Flatness Vs. Wavelength

    ± half the difference between the maximum and the minimum value of all ratios. Figure 12 Power linearity. Conditions: Uninterrupted tunable laser source output power, constant wavelength setting, constant temperature. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 42 ± half the span (in dB) between the highest and lowest actual power. Figure 13 Power stability. Conditions: Time span as specified. Uninterrupted tunable laser source output power, constant wavelength and power level settings, constant temperature. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 43: Figure 14 Relative Wavelength Accuracy

    ± half the span between the maximum and the minimum value of all differences. Figure 14 Relative wavelength accuracy. Conditions: Uninterrupted tunable laser source output power, constant power setting, constant temperature. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 44 N O T E Side-mode suppression ratio The ratio of optical power in the main mode to the optical power of the highest sidemode, expressed in dB: Conditions: As specified. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 45: Figure 15 Signal To Source Spontaneous Emission Ratio

    Measurement: Using an optical spectrum analyzer at 0.5 nm resolution bandwidth (to address the possibility of higher SSE within a narrower bandwidth), then extrapolated to 1 nm bandwidth. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 46: Figure 16 Signal To Total Source Spontaneous Emission Ratio

    Measurement principles are indicated. Alternative measurement principles of equal value are also acceptable. Wavelength range The range of wavelengths for which the specifications apply (if not otherwise specified). Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 47 ± half the span between the maximum and minimum of all wavelengths. Conditions: Time span as specified, uninterrupted tunable laser source output power, constant wavelength and power level settings, constant temperature. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 48: General Definitions

    During a continuous sweep the dynamic specifications and the “Logged wavelength” applies. Measurement principles are indicated. Alternative measurement principles of equal value are also acceptable. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 49: Compact Tunable Laser Module Specifications

    Keysight 81980A Compact Tunable Laser Source, 1465 nm to 1575 nm . 48 Keysight 81940A Compact Tunable Laser Source, 1520 nm to 1630 nm . 49 81944A Compact Tunable Laser Source, 1525 nm to 1620 nm..50 Keysight 81989A Compact Tunable Laser Source, 1465 nm to 1575 nm .
  • Page 50 At day of calibration. At maximum output power as specified per wavelength range. Value for 1 nm resolution bandwidth. At constant temperature ±0.5 K Value for 0.1 nm resolution bandwidth. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 51 At day of calibration. At maximum output power as specified per wavelength range. Value for 1 nm resolution bandwidth. At constant temperature ±0.5 K Value for 0.1 nm resolution bandwidth. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 52 At day of calibration. At maximum output power as specified. Value for 1 nm resolution bandwidth e ± At constant temperatur 0.5 K Value for 0.1 nm resolution bandwidth. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 53 0.95 kg At maximum output power as specified per wavelength range. Value for 1 nm resolution bandwidth. At constant temperature ±0.5 K Value for 0.1 nm resolution bandwidth. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 54 0.95 kg At maximum output power as specified per wavelength range. Value for 1 nm resolution bandwidth. At constant temperature ±0.5 K Value for 0.1 nm resolution bandwidth. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 55: Conditions

    C to 35 Warm-up time: immediate operation after boot-up Output Power: Specifications are valid at output power  +5 dBm. Specifications are valid in non-condensing conditions, in CW operation. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 56: Supplementary Performance Characteristics

    < ±0.025 dB over 1 minute by drastically reducing interference effects in the test setup. SBS Suppression: Effective linewidth: 500 MHz Residual amplitude modulation: <±0.5% Displayed wavelength represents average wavelength while digital modulation is active. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 57 Continuous Sweep Mode (Keysight 81980A, 81940A and 81944A) Mode-hop free sweeping:  Full wavelength range at flat output power +10 dBm   Ambient temperature within +20 C and +30 Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 58: General

    , straight contact output connector. Option 072: , angled contact output connector. Connector Interface: One Keysight 81000xI-series connector interface is required. Does not apply to 81944A. 81944A: Standard SMF fiber used. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 59: Performance Tests

    Performance Tests The procedures in this chapter test the optical performance of Keysight 81940A, 44A, 49A, 80A & 89A Tunable Laser Source Family. The complete specifications to which each module is tested are given in “Specifications” on page All tests can be performed without access to the interior of the module.

  • Page 60: Required Test Equipment

    You can use the HP 71452B or HP 71450A #100 instead of the Keysight 86142B. You can use the Keysight 86120B or 86122A or Burleigh WA-1500 Wavemeter instead of the Keysight 86120C. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 61: Test Record

    Always ensure that you use the correct cables and adapters, and that all connectors are undamaged and extremely clean. If a Keysight 81940A, 44A, 49A, 80A & 89A Tunable Laser Source Family fails any performance test, return it to the nearest Keysight Technologies Sales/Service Office for repair.

  • Page 62: Performance Test Instructions

    Tunable Laser Module Specifications” on page General test Setup Insert your Compact Tunable Laser Source from the front of Slot 1 of the Keysight 8164A/B Lightwave Measurement System. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 63: Wavelength Tests

    Set the Wavelength meter: • Set Display to Wavelength, • Set Medium to Vacuum, • Set Resolution to Auto, • Set Averaging to On, • Set Input Attenuation to Auto. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 64: Wavelength Accuracy

    The measurement of the relative wavelength accuracy includes the measurement of absolute wavelength accuracy. The absolute wavelength accuracy measurement program generates all the results needed for the calculation of the relative wavelength accuracy. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 65: Figure 18 Absolute And Relative Wavelength Accuracy

    Use the TLS module’s built-in attenuator, or an external attenuator. • Such that any modulation is off. At the end of the test, the TLS is set to its maximum specified wavelength. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 66 Maximum Wavelength Value Keysight 81980A 1575.000 nm Keysight 81989A 1575.000 nm Keysight 81940A 1630.000 nm 81944A 1620.000 nm Keysight 81949A 1630.000 nm Repeat step 4 step 8 another four times. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 67 Largest Maximum Deviation. Determine, and note in the Test Record, the Absolute Wavelength Accuracy, which is the largest deviation (of either the Smallest Minimum Deviation or the Largest Maximum Deviation). Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 68: Mode-Hop Free Tuning

    As a result, a mode-hop is generally not possible. The previous tests of absolute and relative wavelength accuracy have proved the functionality and performance of the built-in wavelength meter. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 69: Wavelength Repeatability

    Use the TLS module’s built-in attenuator, or an external attenuator. • Such that any modulation is off, At the end of the test, the TLS is set to its maximum specified wavelength. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 70 From all wavelength measurements, pick the largest measured value and the smallest measured value. Calculate the wavelength repeatability by subtracting the smallest measured value from the largest measured value. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 71: Power Tests

    • To an output power larger than the specified output power, • Such that any modulation is off. At the end of the test, the TLS is set to its maximum specified wavelength. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 72: Figure 22 Test Setup For Maximum Output Power Tests

    Keysight 81980A 1465.000 nm + 15.00 dBm Keysight 81989A 1465.000 nm + 15.00 dBm Keysight 81940A 1520.000 nm + 15.00 dBm Keysight 81949A 1520.000 nm + 15.00 dBm Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 73: Figure 23 Test Setup For Maximum Output Power Tests

    (mean) output power, as well as the amount of the output power modulation. Set up the equipment as shown in Figure Figure 23 Test Setup for Maximum Output Power Tests Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 74 • Select module 2.1 (if 81619A is in slot 2, the 81626B connected to “Head 1". • Select [Parameter]. Set Total Time to 1 minute, 00:01:00. Set AvgTime to 100s. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 75 , the output wavelength, of the compact TLS module to the next value given in the Test Record. Repeat step 7 step 14 for the full wavelength range. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 76: Power Linearity

    Output power is decremented in 1 dB steps. At the end of the test, the compact TLS is set to its minimum output power. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 77: Figure 25 Test Setup For Power Linearity Tests

    • Zero the 81626B. Select <Menu> then <Zero>, • Set the power range manually to +20 dBm, • Set the Averaging Time to 500 ms, • Select <dB> as the power units, Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 78: Figure 12 Power Linearity

    Maximum Power Linearity at current setting: + 0.04 dBm Minimum Power Linearity at current setting: - 0.03 dBm Total Linearity = Max. Power Linearity - Min. Power Linearity 0.07 dBpp Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 79: Power Flatness Versus Wavelength

    The wavelength is increased in 5 nm increments and the difference between the measured and the displayed power is recorded. At the end of the test, the TLS is set to its maximum specified wavelength. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 80: Figure 27 Test Setup For Power Linearity Tests

    Keysight 81989A 1465.000 nm + 10.00 dBm Keysight 81940A 1520.000 nm + 10.00 dBm Keysight 81949A 1520.000 nm + 10.00 dBm Make sure the optical output is switched off. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 81 Determine the maximum deviation and the minimum deviation from REF and record them in the Test Record. Subtract the minimum deviation from the maximum deviation and record the result as the Flatness. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 82: Power Stability

    At any time during the measurement, the actual output power is compared to the reference and recorded. The end of the test is defined by the specified stability time. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 83: Figure 29 Test Setup For Power Stability Tests

    Zero the power meter. Press [Menu] then select <Zero>. Switch on the TLS output, then wait for 1 minute. Select the logging application. Press [Appl] then select <Logging>. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 84 From the Statistics window, note the following results in the Test Record: • The “max” value as the Maximum Deviation, • The “min” value as the Minimum Deviation,  • The “ P” value as the Power Stability. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 85: Signal-To-Source Spontaneous Emission Ratio

    OSA, then the measurement result is extrapolated for a bandwidth resolution of 1 nm (a factor of 2 relates to 3 dB). This value is recorded as the test result. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 86: Figure 31 Test Setup For Source Spontaneous Emission Test

    <Source State> <Off> <Power Unit> <dBm> <Power Mode> <Automatic> Modulation: <mod src> <Off> Make sure the optical output is switched off. Set the wavelength of the compact TLS to: Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 87 Increase the wavelength of the compact TLS by 10 nm, as listed in the Test Record. Repeat step 10 step 12 for all wavelength settings listed in the Test Record. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 88: Optional Performance Tests

    SSE based on the last sample on the left, at -3 nm, and the first sample on the right, at +3 nm. Figure 32 Total SSE Measurement. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 89: Figure 33 Test Setup For Source Spontaneous Emission Test

    • Set Resolution Bandwidth (RBW) to 1 mm, Press [Ampl], press [BW Sup], then enter the value. • Set Sensitivity to - 60 dBm, Press [Ampl], press [Sens], then enter the value. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 90 +1 nm no value +2 nm no value +3 nm no value +4 nm no value +13 nm +14 nm 15 nm Sum of all partial noise power levels Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 91 Watts W, or picoWatts pW. This ensures that the equation in step 12 delivers the Total SSE in decibels Note the result in the Test Record: Total SSE = _____________________ dB Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 92: Test Records

    Keysight 81980A Performance Test ..... . .91 Keysight 81940A Performance Test ..... .101 81944A Performance Test .

  • Page 93: Test Record

    Report No.: Date: Customer: Tested By: Model: Keysight 81980A Compact Tunable Laser Source module ° Serial No. Ambient temperature Options. Relative humidity Firmware Rev. Line frequency Special Notes: Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 94 Model: Keysight 81980A Report No. ________ Date: ________ Test Equipment Used Description Model No. Trace No. Cal. due date 1. Standard Optical Head 2. Optical Spectrum Analyzer 3. Wavelength Meter Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 95 1540.000 nm 1555.000 nm 1565.000 nm 1575.000 nm Within full tuning range 1465 nm - 1575 nm Maximum Deviation Minimum Deviation Wavelength Deviation = Wavelength Measured - Wavelength Setting Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 96 Absolute Wavelength Accuracy Result Largest Value of Deviation (= largest of either Largest Maximum Deviation or Smallest Minimum Deviation). Absolute Wavelength Accuracy ± Test Limit 0.02 ± Measurement Uncertainty: Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 97 ________ nm Wavelength Repeatability ________ nm (= largest measured wavelength - smallest measured wavelength) Upper Test Limit 0.005 nm Performance Characteristic 0.002 nm typical ± Measurement Uncertainty: 0.1 pm Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 98 + 13.00 dBm 1555.000 nm __________ dBm + 13.00 dBm 1565.000 nm __________ dBm + 13.00 dBm 1475.000 nm __________ dBm + 13.00 dBm ± Measurement Uncertainty: 4.5 % Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 99 ________ dB Total Power Linearity at current setting ________ dBpp (= Maximum Power Linearity - Minimum Power Linearity) Upper Test Limit 0.2 dBpp ± Measurement Uncertainty 0.04 dB Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 100 Wavelength Range (1525 nm - 1575 nm) Maximum deviation: Minimum deviation: Flatness = Maximum - Minimum deviation: Upper Test Limit: 0.40 dBpp Performance Characteristic: dBpp Measurement Uncertainty: ± 2.6 % Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 101: Figure 13 Power Stability

    + 13.00 dBm _______ dB 48 dB 1570.000 nm + 13.00 dBm _______ dB 48 dB 1575.000 nm + 13.00 dBm _______ dB 48 dB Measurement Uncertainty: ± 0.20 dB Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 102 Power_total_SSE = OSA_noise +SSE_power_TLS_max ________ pW Measurement Result = Total SSE (use formula below) ________ pW Lower Test Limit 22 dB Performance Characteristic 25 dB typical ± Measurement Uncertainty: 2.0 dB Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 103: Test Record

    Report No.: Date: Customer: Tested By: Model: Keysight 81940A Compact Tunable Laser Source module ° Serial No. Ambient temperature Options. Relative humidity Firmware Rev. Line frequency Special Notes: Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 104 Model: Keysight 81940A Report No. ________ Date: ________ Test Equipment Used Description Model No. Trace No. Cal. due date 1. Standard Optical Head 2. Optical Spectrum Analyzer 3. Wavelength Meter Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 105 1595.000 nm 1610.000 nm 1620.000 nm 1630.000 nm Within full tuning range 1520 nm - 1630 nm Maximum Deviation Minimum Deviation Wavelength Deviation = Wavelength Measured - Wavelength Setting Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 106 Absolute Wavelength Accuracy Result Largest Value of Deviation (= largest of either Largest Maximum Deviation or Smallest Minimum Deviation). Absolute Wavelength Accuracy ± Test Limit 0.02 ± Measurement Uncertainty: Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 107 ________ nm Wavelength Repeatability ________ nm (= largest measured wavelength - smallest measured wavelength) Upper Test Limit 0.005 nm Performance Characteristic 0.002 nm typical ± Measurement Uncertainty: 0.1 pm Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 108 + 13.00 dBm 1610.000 nm __________ dBm + 13.00 dBm 1620.000 nm __________ dBm + 13.00 dBm 1630.000 nm __________ dBm + 10.00 dBm ± Measurement Uncertainty: 4.5 % Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 109 ________ dB Total Power Linearity at current setting ________ dBpp (= Maximum Power Linearity - Minimum Power Linearity) Upper Test Limit 0.2 dBpp ± Measurement Uncertainty 0.04 dB Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 110 Wavelength Range (1570 nm - 1620 nm) Maximum deviation: Minimum deviation: Flatness = Maximum - Minimum deviation: Upper Test Limit: 0.40 dBpp Performance Characteristic: dBpp Measurement Uncertainty: ± 2.6 % Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 111 + 13.00 dBm _______ dB 48 dB 1625.000 nm + 10.00 dBm _______ dB 45 dB 1630.000 nm + 10.00 dBm _______ dB 45 dB Measurement Uncertainty: ± 0.20 dB Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 112 Power_total_SSE = OSA_noise +SSE_power_TLS_max ________ pW Measurement Result = Total SSE (use formula below) ________ pW Lower Test Limit 22 dB Performance Characteristic 25 dB typical ± Measurement Uncertainty: 2.0 dB Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 113: Test Record

    Page 1 of 7 Report No.: Date: Customer: Tested By: Model: 81944A Compact Tunable Laser Source module ° Serial No. Ambient temperature Options. Relative humidity Firmware Rev. Line frequency Special Notes: Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 114 Model: 81944A Report No. ________ Date: ________ Test Equipment Used Description Model No. Trace No. Cal. due date 1. Standard Optical Head 2. Optical Spectrum Analyzer 3. Wavelength Meter Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 115 1580.000 nm 1595.000 nm 1610.000 nm 1620.000 nm Within full tuning range 1525 nm - 1620 nm Maximum Deviation Minimum Deviation Wavelength Deviation = Wavelength Measured - Wavelength Setting Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 116 Absolute Wavelength Accuracy Result Largest Value of Deviation (= largest of either Largest Maximum Deviation or Smallest Minimum Deviation). Absolute Wavelength Accuracy ± Test Limit 0.02 ± Measurement Uncertainty: Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 117 ________ nm Wavelength Repeatability ________ nm (= largest measured wavelength - smallest measured wavelength) Upper Test Limit 0.005 nm Performance Characteristic 0.002 nm typical ± Measurement Uncertainty: 0.1 pm Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 118 1620.000 nm __________ dBm __________ dBm __________ dBm + 10.00 dBm __________ dBpp 1.5 dBpp Measurement Uncertainty: ± 4.5 % Mean Maximum Output Power = (Measured Maximum Power + Measured Minimum Power) / 2 Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 119 Power_total_SSE = OSA_noise +SSE_power_TLS_max ________ pW Measurement Result = Total SSE (use formula below) ________ pW Lower Test Limit 20 dB Performance Characteristic 25 dB typical ± Measurement Uncertainty: 2.0 dB Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 120: Test Record

    Report No.: Date: Customer: Tested By: Model: Keysight 81989A Compact Tunable Laser Source module ° Serial No. Ambient temperature Options. Relative humidity Firmware Rev. Line frequency Special Notes: Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 121 Model: Keysight 81989A Report No. ________ Date: ________ Test Equipment Used Description Model No. Trace No. Cal. due date 1. Standard Optical Head 2. Optical Spectrum Analyzer 3. Wavelength Meter Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 122 1540.000 nm 1555.000 nm 1565.000 nm 1575.000 nm Within full tuning range 1465 nm - 1575 nm Maximum Deviation Minimum Deviation Wavelength Deviation = Wavelength Measured - Wavelength Setting Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 123 Absolute Wavelength Accuracy Result Largest Value of Deviation (= largest of either Largest Maximum Deviation or Smallest Minimum Deviation). Absolute Wavelength Accuracy ± Test Limit ± Measurement Uncertainty: Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 124 ________ nm smallest measured wavelength ________ nm Wavelength Repeatability ________ nm (= largest measured wavelength - smallest measured wavelength) Upper Test Limit 0.01 nm ± Measurement Uncertainty: 0.1 pm Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 125 + 13.00 dBm 1555.000 nm __________ dBm + 13.00 dBm 1565.000 nm __________ dBm + 13.00 dBm 1475.000 nm __________ dBm + 13.00 dBm ± Measurement Uncertainty: 4.5 % Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 126 ________ dB Total Power Linearity at current setting ________ dBpp (= Maximum Power Linearity - Minimum Power Linearity) Upper Test Limit 0.2 dBpp ± Measurement Uncertainty 0.04 dB Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 127 Wavelength Range (1525nm - 1575 nm) Maximum deviation: Minimum deviation: Flatness = Maximum - Minimum deviation: Upper Test Limit: 0.40 dBpp Performance Characteristic: dBpp Measurement Uncertainty: ± 2.6 % Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 128 + 13.00 dBm _______ dB 48 dB 1570.000 nm + 13.00 dBm _______ dB 48 dB 1575.000 nm + 13.00 dBm _______ dB 48 dB Measurement Uncertainty: ± 0.20 dB Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 129 Power_total_SSE = OSA_noise +SSE_power_TLS_max ________ pW Measurement Result = Total SSE (use formula below) ________ pW Lower Test Limit 22 dB Performance Characteristic 25 dB typical ± Measurement Uncertainty: 2.0 dB Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 130: Test Record

    Report No.: Date: Customer: Tested By: Model: Keysight 81949A Compact Tunable Laser Source module ° Serial No. Ambient temperature Options. Relative humidity Firmware Rev. Line frequency Special Notes: Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 131 Model: Keysight 81949A Report No. ________ Date: ________ Test Equipment Used Description Model No. Trace No. Cal. due date 1. Standard Optical Head 2. Optical Spectrum Analyzer 3. Wavelength Meter Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 132 1595.000 nm 1610.000 nm 1620.000 nm 1630.000 nm Within full tuning range 1520 nm - 1630 nm Maximum Deviation Minimum Deviation Wavelength Deviation = Wavelength Measured - Wavelength Setting Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 133 Absolute Wavelength Accuracy Result Largest Value of Deviation (= largest of either Largest Maximum Deviation or Smallest Minimum Deviation). Absolute Wavelength Accuracy ± Test Limit ± Measurement Uncertainty: Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 134 ________ nm smallest measured wavelength ________ nm Wavelength Repeatability ________ nm (= largest measured wavelength - smallest measured wavelength) Upper Test Limit 0.01 nm ± Measurement Uncertainty: 0.1 pm Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 135 + 13.00 dBm 1610.000 nm __________ dBm + 13.00 dBm 1620.000 nm __________ dBm + 13.00 dBm 1630.000 nm __________ dBm + 10.00 dBm ± Measurement Uncertainty: 4.5 % Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 136 ________ dB Total Power Linearity at current setting ________ dBpp (= Maximum Power Linearity - Minimum Power Linearity) Upper Test Limit 0.2 dBpp ± Measurement Uncertainty 0.04 dB Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 137 Wavelength Range (1570 nm - 1620 nm) Maximum deviation: Minimum deviation: Flatness = Maximum - Minimum deviation: Upper Test Limit: 0.40 dBpp Performance Characteristic: dBpp Measurement Uncertainty: ± 2.6 % Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 138 + 13.00 dBm _______ dB 48 dB 1625.000 nm + 10.00 dBm _______ dB 45 dB 1630.000 nm + 10.00 dBm _______ dB 45dB Measurement Uncertainty: ± 0.20 dB Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 139 Power_total_SSE = OSA_noise +SSE_power_TLS_max ________ pW Measurement Result = Total SSE (use formula below) ________ pW Lower Test Limit 22 dB Performance Characteristic 25dB typical ± Measurement Uncertainty: 2.0 dB Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 140 Performance Tests Test Records Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 141: Cleaning Information

    Cleaning Information The Cleaning Instructions provided in this chapter apply to a number of different types of Optical Equipment. Cleaning Instructions for this Module If you must clean the Keysight Tunable Laser Source Family, please refer the module to the skilled personnel of Keysight’s service team.

  • Page 142: Cleaning Instructions

    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. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 143: Why Is It Important To Clean Optical Devices

    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. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 144: What Do I Need For Proper Cleaning

    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 your health. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 145 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. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 146 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 Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 147 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. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 148: Preserving Connectors

    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. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 149: Which Cleaning Procedure Should I Use

    Module” on page 139 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. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 150: How To Clean Connectors

    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. Blow away any remaining lint with compressed air. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 151 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. Blow away any remaining lint with compressed air. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 152: How To Clean Connector Interfaces

    Using a new, dry pipe-cleaner, and a new, dry cotton-swab remove the alcohol, any dissolved sediment and dust. Blow away any remaining lint with compressed air. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 153: How To Clean Bare Fiber Adapters

    Clean the adapter by rubbing a new, dry cotton-swab over the surface using a small circular movement. Blow away any remaining lint with compressed air. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 154: How To Clean Instruments With A Fixed Connector Interface

    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. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 155: Additional Cleaning Information

    Carefully clean the bare fiber with this tissue. Make your cleave and immediately insert the fiber into your bare fiber adapter in order to protect the surface from dirt. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...

  • Page 156: Other Cleaning Hints

    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. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 157 Wavelength repeatability 45 Specifications wavelength resolution 45 81940A 49 wavelength stability 45 81949A 52 81980A 48 81989A 51 Storage 14 Front Panel Supplementary Performance Characteristics 54 Controls and Indicators 19 Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 158 Index Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS modules, Edition 5...
  • Page 159 This information is subject to change without notice. © Keysight Technologies 2002 - 2015 Edition 5, March 2015 www.keysight.com...

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