Keysight Technologies 81663A User Manual
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Keysight Technologies 81663A User Manual

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Keysight 81663A
DFB Laser Source Module
User Guide

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Summary of Contents for Keysight Technologies 81663A

  • Page 1 Keysight 81663A DFB Laser Source Module User Guide...
  • Page 2 FURNISHING, USE, OR PERFORMANCE OF agreement and written consent from related to commercial computer software THIS DOCUMENT OR ANY INFORMATION Keysight Technologies as governed by or commercial computer software docu- CONTAINED HEREIN. SHOULD KEYSIGHT United States and international copyright mentation that is not customarily provided AND THE USER HAVE A SEPARATE laws.

  • Page 3: Table Of Contents

    What is a Laser Source Module? A Description of the Front Panel Optical Output Operation Note Maintaining Wavelength Accuracy Below Maximum Power Keysight Technologies Sales and Service Offices 2 Accessories Recommended Connector Interfaces Wavelength Options 3 Performance Tests Equipment Required Test Record Keysight DFB Laser Source Module User’s Guide...
  • Page 4 Contents Test Failure Instrument Specification Performance Test Instructions All Wavelength Tests Wavelength Repeatability Test Wavelength Stability Test Test Records Test Records 4 Cleaning Information Cleaning Instructions for this Instrument Safety Precautions Why is it important to clean optical devices? What do I need for proper cleaning? Standard Cleaning Equipment Additional Cleaning Equipment Preserving Connectors...
  • Page 5 Contents How to clean connector interfaces Preferred Procedure Procedure for Stubborn Dirt How to clean bare fiber adapters Preferred Procedure Procedure for Stubborn Dirt How to clean lenses Preferred Procedure Procedure for Stubborn Dirt How to clean instruments with a fixed connector interface How to clean instruments with an optical glass plate How to clean instruments with a physical contact interface Preferred Procedure...
  • Page 6 Contents Other Cleaning Hints Making the connection Lens cleaning papers Immersion oil and other index matching compounds Cleaning the housing and the mainframe 5 Specifications Definition of Terms Wavelength tuning range Wavelength display resolution Wavelength repeatability Wavelength stability Max. output power Power CW stability Sidemode suppression ratio (SMSR) Polarization extinction ratio (PER)
  • Page 7 / 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.

  • Page 8: Safety Considerations

    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.

  • Page 9: Line Power Requirements

    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.

  • Page 10: Initial Safety Information For Laser Source Modules

    * Max. CW output power is defined as the highest possible optical power that the laser source can produce at its output connector. Laser Safety Labels Laser Class 1M Figure 1 Laser Class 1M Safety Label - Keysight 81663A Keysight DFB Laser Source Module User’s Guide...
  • Page 11 Getting Started with DFB Laser Sources 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 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.

  • Page 12: What Is A Laser Source Module

    What is a DFB Laser Source Module? A distributed feedback (DFB) laser is a highly- coherent laser source that emits radiation in a narrow spectral width. The Keysight Technologies DFB laser source module may be tuned within a specific wavelength range, the current wavelength is displayed on the user interface of your mainframe.

  • Page 13: Optical Output

    Getting Started with DFB Laser Sources Optical Output Polarization Maintaining Fiber The Keysight 81663A DFB Laser Source module is equipped with a polarization maintaining fiber (PMF) as standard, the PMF is aligned to maintain the state of polarization. The fiber is of Panda type, with TE mode in the slow axis in line with the connector key.
  • Page 14 Getting Started with DFB Laser Sources Angled Contact Connectors The Keysight 81663A DFB Laser Source module is equipped with an angled contact optical output connector as standard. Angled contact connector helps you to control return loss. With angled fiber endfaces, reflected light tends to reflect into the cladding, reducing the amount of light that reflects back to the source.

  • Page 15: Operation Note

    Move to [P], and press Enter. b Set the power value to the maximum power for the module. The maximum power for the 81663A is 13 dBm.Since the maximum displayed power of the 86120C is 10 dBm, we recommend you use a power splitter or attenuator between the source and the wavelength meter.
  • Page 16 Getting Started with DFB Laser Sources On the user interface of your 8163A/B Lightwave Multimeter, perform the following steps: a Move to [P], and press Enter. b Reduce the power for the module. Allow your wavelength meter to settle to a stable wavelength value. If the displayed value is not accurate enough for your application, on the user interface of your 8163A/B Lightwave Multimeter, perform the following steps:...

  • Page 17: Keysight Technologies Sales And Service Offices

    Getting Started with DFB Laser Sources 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 measurement sales representative.
  • Page 19 Keysight 81663A DFB Laser Source Module User’s Guide Accessories Instrument Required / 16 The Keysight 81663A DFB Laser Source Module is available in various configurations for the best possible match to the most common applications. This chapter provides information on the available options and accessories.

  • Page 20: Recommended Connector Interfaces

    Accessories Recommended Connector Interfaces Figure 6 Recommended Connector Interfaces Keysight DFB Laser Source Module User’s Guide...

  • Page 21: Wavelength Options

    Accessories Wavelength Options Table 2 DFB Laser Source Modules Laser Safety Information Keysight 81663A Option Number Center Wavelength [nm] #131 1310 #149 1490 #151 1510 #155 1550 #162 1625 Keysight DFB Laser Source Module User’s Guide...

  • Page 22: Equipment Required

    / 30 Test Records / 32 The procedures in this section test the optical performance of the instrument. The complete specifications to which the Keysight 81663A DFB Laser Source Module is tested are given in Specifications on page no 65. All tests can be performed without access to the interior of the instrument.
  • Page 23 Performance Tests Equipment Required Equipment required for the performance test is listed below: Table 3 Required Equipment Instrument/Accessory Recommended Model Required Al ternative Models Characteristics Multimeter Mainframe 8163B 8163A, 164A/B, 8166A/B Wavelength Meter 86122A 86120C, 86122C Singlemode Fibers 81113PC Connector Interfaces 81000FI 81000SI Keysight DFB Laser Source Module User’s Guide...
  • Page 24 Results of the performance test may be noted in the Test Record provided at the end of the Test Procedures. The Test Record can also be used as a permanent record and may be reproduced without written permission from Keysight Technologies. Keysight DFB Laser Source Module User’s Guide...
  • Page 25 Performance Tests Test Failure If the Keysight 81663A DFB Laser Source Module fails any performance test, return the instrument to the nearest Keysight Technologies Sales/Service Office for repair. Keysight DFB Laser Source Module User’s Guide...

  • Page 26: Instrument Specification

    65, are the performance standards or limits against which the Keysight 81663A DFB Laser Source Module can be tested. The specifications also list some supplemental characteristics of the Keysight 81663A DFB Laser Source Module. Supplemental characteristics should be considered as additional information.

  • Page 27: Performance Test Instructions

    Performance Tests Performance Test Instructions The performance tests given in this section include the Wavelength Repeatability Test and the Wavelength Stability Test. Perform each step in the order given, using the corresponding test equipment. • Make sure that all the optical connections used in the test setups NOTE given in the procedures are dry and clean.

  • Page 28: Wavelength Stability Test

    Performance Tests Adjust the frequency offset to the first value given in the test record in column “from wavelength”. Wait until the wavelength meter has settled. Then measure the wavelength and note the result in the test record as the reference wavelength, “REF”.

  • Page 29: Test Records

    Performance Tests Test Records Performance Test for the Keysight 81663A Page 1 of 4 Date ___________ Model Keysight 81663A DFB Laser Source module (_____.__ nm) Serial No. _________________________ Ambient Temperature ___________°C Options _________________________ Relative Humidity ___________ % Firmware Rev. _________________________...
  • Page 30 Performance Tests Performance Test for the Keysight 81663A Test Equipment Used Page 2 of 4 Description Model No. Trace No Cal. Due Date Lightwave Multimeter 8163A/B ____________ ___________ Multichannel System 8166A/B ____________ ___________ Measurement System 8164A/B ____________ ___________ Wavelength Meter...
  • Page 31 Performance Tests Performance Test for the Keysight 81663A Page 3 of 4 Test Test Description Minimum Resul t Maximum Measurement Number Specification. Specification. Uncertainty Wavelength Repeatability measured at ________nm (-50 GHz offset frequency) ________ < 0.01 m, measured at ________nm...

  • Page 32: Test Records

    Performance Tests Test Records Repeatability of Measurement Resul t Repeatability of Measurement Result Df = -50 GHz (= reference) Df = 0 GHz (= reference) Initial Setting REF = Initial Setting REF = from -30 GHz to -50 Ghz from -30 GHz to -50 Ghz from -10 GHz to -50 GHz from -10 GHz to -50 GHz from 0 GHz to -50 GHz...
  • Page 33 Performance Tests Performance Test for the Keysight 81663A Page 4 of 4 Repeatability of Measurement Resul t Stability of ______.__nm Measurement Result Df = +50 GHz (= reference) Initial Setting REF = Start Value from -30 GHz to -50 Ghz...

  • Page 34: Cleaning Information

    Keysight 81663A DFB Laser Source Module User’s Guide 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...
  • Page 35 If you are unsure of the correct cleaning procedure for your optical device, we recommend that you first try cleaning a dummy or test device. Keysight Technologies assume no liability for the customer’s failure to comply with these requirements. Keysight DFB Laser Source Module User’s Guide...
  • Page 36 Cleaning Information Cleaning Instructions for this Instrument The Cleaning Instructions apply to a number of different types of Optical Equipment. How to clean instruments with a physical contact interface on page 56 is particularly relevant to this module. Keysight DFB Laser Source Module User’s Guide...

  • Page 37: Safety Precautions

    Cleaning Information Safety Precautions Please follow the following safety rules: • Do not remove instrument covers when operating. • Ensure that the instrument is switched off throughout the cleaning procedures. • Use of controls or adjustments or performance of procedures other than those specified may result in hazardous radiation exposure.

  • Page 38: Why Is It Important To Clean Optical Devices

    Cleaning Information Why is it important to clean optical devices? In transmission links optical fiber cores are about 9 mm (0.00035") in diameter. Dust and other particles, however, can range from tenths to hundredths of microns in diameter. Their comparative size means that they can cover a part of the end of a fiber core, and as a result will reduce the performance of your system.

  • Page 39: What Do I Need For Proper Cleaning

    • Compressed air Dust and shutter caps All of Keysight Technologies’ lightwave instruments are delivered with either laser shutter caps or dust caps on the light-wave adapter. Any cables come with covers to protect the cable ends from damage or contamination.
  • Page 40 Cleaning Information evaporated. You should therefore first remove the alcohol and the dust with a soft tissue, and then use compressed air to blow away any remaining filaments. 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.
  • Page 41 Cleaning Information Use only clean, fresh soft tissues and never apply them twice. Any dust and dirt from the air which collects on your tissue, or which has gathered after initial cleaning, may scratch and pollute your optical device. Pipe cleaner Pipe cleaners can be purchased from tobacconists, and come in various shapes and sizes.

  • Page 42: Additional Cleaning Equipment

    Cleaning Information Additional Cleaning Equipment Some Cleaning Procedures need the following equipment, which is not required to clean each instrument: • Microscope with a magnification range about 50X up to 300X • Ultrasonic bath • Warm water and liquid soap •...
  • Page 43 Cleaning Information Warm water and liquid soap Only use water if you are sure that there is no other way of cleaning your optical device without corrosion or damage. Do not use hot water, as this may cause mechanical stress, which can damage your optical device. Ensure that your liquid soap has no abrasive properties or perfume in it.

  • Page 44: Preserving Connectors

    Keep the caps on the equipment always when it is not in use. All of Keysight Technologies’ lightwave instruments and accessories are shipped with either laser shutter caps or dust caps. If you need additional or replacement dust caps, contact your nearest Keysight Technologies Sales/Service Office.

  • Page 45: Cleaning Instrument Housings

    Cleaning Information Cleaning Instrument Housings Use a dry and very soft cotton tissue to clean the instrument housing and the keypad. 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.

  • Page 46: Which Cleaning Procedure Should I Use

    Cleaning Information Which Cleaning Procedure should I use? Light dirt If you just want to clean away light dirt, observe the following procedure for all devices: • Use compressed air to blow away large particles. • Clean the device with a dry cotton swab. •...

  • Page 47: How To Clean Connectors

    Cleaning Information How to clean connectors Cleaning connectors is difficult as the core diameter of a single-mode fiber is only about 9 mm. This generally means you cannot see streaks or scratches on the surface. To be certain of the condition of the surface of your connector and to check it after cleaning, you need a microscope.

  • Page 48: Procedure For Stubborn Dirt

    Cleaning Information Procedure for Stubborn Dirt Use this procedure particularly when there is greasy dirt on the connector: Moisten a new cotton-swab with isopropyl alcohol. Clean the connector by rubbing the cotton-swab over the surface using a small circular movement. 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.

  • Page 49: How To Clean Connector Adapters

    Cleaning Information How to clean connector adapters Some adapters have an anti-reflection coating on the back to reduce CAUTION back reflection. This coating is extremely sensitive to solvents and mechanical abrasion. Extra care is needed when cleaning these adapters. Preferred Procedure Use the following procedure on most occasions: Clean the adapter by rubbing a new, dry cotton swab over the surface using a small circular movement.

  • Page 50: How To Clean Connector Interfaces

    Cleaning Information How to clean connector interfaces Be careful when using pipe-cleaners, as the core and the bristles of the CAUTION pipe-cleaner are hard and can damage the interface. Do not use pipe-cleaners on optical head adapters, as the hard core of normal pipe cleaners can damage the bottom of an adapter.

  • Page 51: How To Clean Bare Fiber Adapters

    Cleaning Information How to clean bare fiber adapters Bare fiber adapters are difficult to clean. Protect from dust unless they are in use. Never use any kind of solvent when cleaning a bare fiber adapter as CAUTION solvents can: • Damage the foam inside some adapters. •...

  • Page 52: How To Clean Lenses

    Cleaning Information How to clean lenses Some lenses have special coatings that are sensitive to solvents, grease, liquid and mechanical abrasion. Take extra care when cleaning lenses with these coatings. Lens assemblies consisting of several lenses are not normally sealed. Therefore, use as little alcohol as possible, as it can get between the lenses and in doing so can change the properties of projection.

  • Page 53: How To Clean Instruments With A Fixed Connector Interface

    Cleaning Information How to clean instruments with a fixed connector interface You should only clean instruments with a fixed connector interface when it is absolutely necessary. This is because it is difficult to remove any used alcohol or filaments from the input of the optical block. It is important, therefore, to keep dust caps on the equipment at all times, except when your optical device is in use.

  • Page 54: How To Clean Instruments With An Optical Glass Plate

    Cleaning Information How to clean instruments with an optical glass plate Some instruments, for example, the optical heads from Keysight Technologies have an optical glass plate to protect the sensor. Clean this glass plate in the same way as optical lenses (see How to clean lenses page 53).

  • Page 55: How To Clean Instruments With A Physical Contact Interface

    Cleaning Information How to clean instruments with a physical contact interface Remove any connector interfaces from the optical output of the instrument before you start the cleaning procedure. Cleaning interfaces is difficult as the core diameter of a single-mode fiber is only about 9 mm.
  • Page 56 Cleaning Information 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 DFB Laser Source Module User’s Guide...

  • Page 57: How To Clean Instruments With A Recessed Lens Interface

    Cleaning Information How to clean instruments with a recessed lens interface For instruments with a deeply recessed lens interface (for example the WARNING Keysight 81633A and 81634A Power Sensors) do NOT follow this procedure. Alcohol and compressed air could damage your lens even further.

  • Page 58: How To Clean Optical Devices Which Are Sensitive To Mechanical Stress And Pressure

    Cleaning Information How to clean optical devices which are sensitive to mechanical stress and pressure Some optical devices, such as the Keysight 81000BR Reference Reflector, which has a gold plated surface, are very sensitive to mechanical stress or pressure. Do not use cotton- swabs, soft- tissues or other mechanical cleaning tools, as these can scratch or destroy the surface.

  • Page 59: How To Clean Metal Filters Or Attenuator Gratings

    Cleaning Information How to clean metal filters or attenuator gratings This kind of device is extremely fragile. A misalignment of the grating leads to inaccurate measurements. Never touch the surface of the metal filter or attenuator grating. Be very careful when using or cleaning these devices. Do not use cotton- swabs or soft- tissues, as there is the danger that you cannot remove the lint and that the device will be destroyed by becoming mechanically distorted.

  • Page 60: Additional Cleaning Information

    Cleaning Information Additional Cleaning Information The following cleaning procedure may be used with other optical equipment: • How to clean bare fiber ends • How to clean large area lenses and mirrors How to clean bare fiber ends Bare fiber ends are often used for splices or, together with other optical components, to create a parallel beam.
  • Page 61 Cleaning Information Procedure for Stubborn Dirt Use this procedure particularly when there is greasy dirt on the lens: Only use water if you are sure that there is no other way of cleaning your CAUTION optical device without causing corrosion or damage. Only use water if you are sure that there is no other way of cleaning your optical device without causing corrosion or damage.
  • Page 62 Cleaning Information Alternative Procedure B If your lens is sensitive to water then: Moisten the lens or the mirror with isopropyl alcohol. 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.

  • Page 63: Other Cleaning Hints

    Cleaning Information Other Cleaning Hints Selecting the correct cleaning method is an important element in maintaining your equipment and saving you time and money. This Appendix highlights the main cleaning methods, but cannot address every individual circumstance. This section contain some additional hints which we hope will help you further.

  • Page 64: Cleaning The Housing And The Mainframe

    Cleaning Information Cleaning the housing and the mainframe When cleaning either the mainframe or the housing of your instrument, only use a dry and very soft cotton tissue on the surfaces and the numeric pad. 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.

  • Page 66: Specifications

    / 41 Executing a SCPI through M8070A SCPI Editor / 43 Keysight 81663A DFB Laser Source Module is produced to the ISO 9001 international quality system standard as part of Keysight’s commitment to continually increasing customer satisfaction through improved quality control.

  • Page 67: Definition Of Terms

    Specifications Definition of Terms This section defines terms that are used both in this chapter and Performance Tests on page 25. Generally, all specifications apply for the given environmental conditions and after warm-up time. Measurement principles are indicated. Alternative, measurement principles of equal value are also acceptable.

  • Page 68: Wavelength Stability

    Specifications Measurement With wavelength meter. Averaging time given by wavelength meter, ≥1 s. The long-term wavelength repeatability can be obtained by taking the NOTE wavelength repeatability and wavelength stability into account. Wavelength stability The change of wavelength during given time span, expressed as ± half the span between the maximum and the minimum of all measured wavelengths.

  • Page 69: Power Cw Stability

    Specifications Power CW stability The change of the power level during given time span, expressed as ± half the span (in dB) between the highest and lowest measured power. Conditions Uninterrupted DFB laser source module output power, constant wavelength and power level settings, controlled environment and time span as specified.

  • Page 70: Modulation, Digital

    Specifications Modulation, digital Output signal is modulated with 50% duty cycle by internal on / off switching of the laser current. Switching frequencies as specified. ON- switching with fast output power stabilization When the laser is switched on after the specified warm- up time the output power will settle within the specified time to comply with the power stability specifications.

  • Page 71: Dfb Source Module Specifications

    Specifications DFB Source Module Specifications Specifications apply to maximum power setting after warm- up time. Table 4 Keysight 81663A Keysight 81663A Keysight 81663A Keysight 81663A Keysight 81663A Option #131 Option #149 Option #151 Option #155 Option #162 Type CW DFB Laser with built-in isolator Center Wavelength 1310 nm ±...

  • Page 72: Supplementary Performance Characteristics

    Specifications • f- If previously stored at the same temperature 20 Supplementary Performance Characteristics Internal digital modulation mode: Free selection 200 Hz to 100 kHz. All output signals are pulse shaped, duty cycle 50%. Internal variable coherence control for linewidth broadening. ON- switching with fast output power stabilization <20 s.
  • Page 73 This information is subject to change without notice. © Keysight Technologies 2017 Edition 10.0, January 2017 www.keysight.com...

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