Keysight Technologies 81490A User Manual
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Keysight Technologies 81490A User Manual

Reference transmitter module
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Keysight 81490A
Reference Transmitter Module
User's Guide

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Summary of Contents for Keysight Technologies 81490A

  • Page 1 Keysight 81490A Reference Transmitter Module User’s Guide...
  • Page 2 Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 3 Updates are environmental specifications for the through improved process control. occasionally made to the guide product, or improper site Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...

  • Page 4: Table Of Contents

    Setting the Optical Attenuation Calibrating and Setting the Operating Point Programming Information SCPI Commands New Status Bit New Commands Accessories Recommended Connector Interfaces Specifications Definition of Terms Reference Transmitter Module Specifications General specifications Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 5 Safety Precautions Why is it important to clean optical devices? What do I need for proper cleaning? Preserving Connectors Cleaning Instructions Other Cleaning Hints Warranty Information Remove all doubt Product information online Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 6 Getting Started This chapter introduces the features of the Keysight 81490A Reference Transmitter Module. Safety Considerations ....... 6 Safety Symbols .

  • Page 7: Getting Started

    To avoid hazardous electrical shock, do not perform electrical tests WA R N I NG when there are signs of shipping damage to any portion of the outer enclosure (covers, panels, etc.). Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...

  • Page 8: Line Power Requirements

    Storage and The module can be stored or shipped at temperatures    Shipment between C and +70 C. Protect the module from temperature extremes that may cause condensation within it. Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...

  • Page 9: Environmental Information

    * Max. CW output power means the highest possible optical CW power that the laser source can produce at its output. ** Max. permissible CW output power is the highest possible power that is permitted with- in the appropriate IEC laser class. Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 10 • The laser module has built-in safety circuitry which will disable the optical output in the case of a fault condition. • Refer servicing only to qualified and authorized personnel. Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...

  • Page 11: Getting Started With The Reference Transmitter Module

    This means that when used with an electrical arbitrary waveform generator, the Keysight 81490A Reference Transmitter Module can be used as an optical arbitrary waveform generator. Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...

  • Page 12: The Front Panel

    You have to unlock the laser before you can switch it on. You can unlock the laser when you first switch the mainframe by entering the password. If you need to unlock the laser later, 1. Press Config. Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...

  • Page 13: Rf Data In

    Values outside this range will overdrive the output signal. If you have applied a signal that overdrives the output 1. Reduce the level of the input. 2. Turn the laser off and back on again. Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...

  • Page 14: Operation

    If the temperature differs too much from the temperature at which the last recalibration was performed, this is reflected in the modules status line in the user interface (“Uncal” for 8164A/B, “Unc” for 8163A/B and 8166A/B). Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 15 You can adjust the operating point from -50 to 50. 9. Refresh the results on the optical sampling ’scope. If the crossing point is in the range 50% ± 1% (see Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 16 Figure 1 Modulator bias operating point optimized to eye crossing of If the operating point is not optimized (see Figure return to step Figure 2 Modulator bias operating point not optimized. Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 18 Programming Information This chapter introduces the programming commands associated with the Keysight 81490A Reference Transmitter Module. SCPI Commands ........18 New Status Bit .

  • Page 19: Scpi Commands

    It is either ‘+0,”No error”’ or e.g. ‘-200,”Execution error (StatExecError)”’ Recalibration takes about 6.8 seconds, so it also takes this time to get the reply to the :SYSTem:ERRor? query. parameters: none response: none example: :SOUR1:TRAN:REC Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 20 “uncalibrated” status. This is reflected in the modules status line in the user interface (“Uncal” for 8164A/B, “Unc” for 8163A/B and 8166A/B) and also in the status register (see “New Status Bit” on page 18). Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 21 Values near 1.0 indicate the current temperature is close to the temperature at the last recalibration. Values near 0.0 indicate the current temperature has drifted towards its maximum tolerance limit to trigger the UNCAL bit. Æ example: :SOUR1:TRAN:TCH? 1.0<END> Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 22 Accessories The Keysight 81490A Reference Transmitter 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. Recommended Connector Interfaces ....22...

  • Page 23: Recommended Connector Interfaces

    8166A/B Lightwave Multichannel System Reference Transmitter Module Ref Tx Module 81490A Connector Interfaces Connector 81000FI FC/PC Interface 81000KI SC 81000HI E-2000 81000LI LC/F3000 81000MI MU 81000SI DIN47526 81000VI ST Figure 1 Recommended Connector Interfaces Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 24 Specifications Keysight 81490A Reference Transmitter Module 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. Specifications describe the module’s warranted performance. Supplementary performance characteristics describe the module’s non-warranted typical performance.

  • Page 25: Definition Of Terms

    Conditions: Using a fiber with high quality connectors in perfect condition. Other conditions as specified. “Guide to the Expression of Uncertainty in Measurement” (“GUM”), BIPM, IEC, ISO et al. (1993) Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 26 Jitter (peak-peak) [optical out] The variation of time intervals between successive falling or rising edges of the data output at constant frequency of the data input. Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 27 The maximum ratio of the “one” level average optical power (in Watt) and the “zero” level average optical power P Watt) of the reference transmitter data output, expressed in dB, calculated as   [dB] 10log ------ -   Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 28 Applying a voltage beyond these limits may damage the reference CA U TI O N transmitter. Operational data rate (RF in) The non-return to zero (NRZ) or return to zero (RZ) data rate the reference transmitter is designed for. Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 29 “0 0 0 0 1 1 1 1”. Optical wavelength (optical out) Center of wavelength of the signal at the reference transmitter optical output. Wavelength is defined as wavelength in vacuum. Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 30 Rise and fall time [optical out] Rise time is the average transition time of the data output response on an (instantaneous) upward edge at the data input. Fall time is defined correspondingly at the downward edge. Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 31 Watt), expressed in dB, calculated as     VECP dB 10log --------------   The vertical eye opening A is the power difference between eye “one” level boundary E and eye “zero” level boundary Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 32 5 largest values and taking the highest remaining value. Conditions: Conditions as specified. Measurement: Using a suitable pattern generator and optical/electrical sampling scope with waveform and amplitude analysis software. Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...

  • Page 33: Reference Transmitter Module Specifications

    At data rates: 10.3125, 10.51875 Gb/s; for whole operational data range typical; temperature change ~ 1 K and operation point adjusted to 50% eye crossing f At 1% center region g Jitter of input signal < 10 ps Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...

  • Page 34: General Specifications

    • +5 °C to +40 °C Storage temperature • -40 °C to +70 °C Humidity • 5% to 95% relative humidity, non-condensing 816xB firmware revision • 5.01 and higher Recommended re-calibration period • 2 years Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 36 Test Procedure......... 38 Keysight 81490A Performance Test Record ... . 47...
  • Page 37 • Attenuation range (data output) • Optical wavelength (data output) • Input voltage range • Maximum input voltage • Operational data rate • Optical wavelength (data output) Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 38 • Relative intensity noise (data output) • Rise and fall time (data output) Test method and setup The connection marked (*) should not be opened, except when determining the insertion loss. Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 39 Data rate filters: 10.3125 Gb/s, 10.51825 Gb/s Precision Time Base Module Trigger bandwidth: 2.0 to 15 GHz Keysight 86107A Jitter: < 280 fs #010 Test Procedure Setting up the test 1. Reset all the instruments. Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 40 Set the internal low-pass filter to s data rate of 10.51875 Gb/s. 13.On the J-BERT, set the data amplitude to 0.95V. Calibrating for the test 14.On the optical attenuator module, disable the output. Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 41 Set the data amplitude as given in the table below, according to the wavelength and iteration. Wavelength Iteration Data amplitude 1310 nm 0.85V 0.8V 0.6V 0.4V 0.2V 1550 nm 1.0V 0.8V 0.6V 0.4V 0.2V Set the data pattern to 11110000. Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 42 • average optical output power • rise time, and • fall time. Note the values in the test record. Calculate the final value for the average optical output power. Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 43 43.On the reference transmitter module, select the wavelength 1550 nm. 44.On the optical attenuator module, set the wavelength to 1550 nm. 45.On the optical plug-in of the DCA, set the wavelength to 1550 nm. Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 44 Set attenuation to 0 dB. Enable the output. On the reference transmitter module, enable the output. On the J-BERT, set the data pattern to PRBS 2 On the DCA optical plug-in, enable the optical channel. Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 45 50 % 1 %. ± On the DCA mainframe, enable Acquisition Limit Testing, set number of waveforms to 100. 29.Loop for all amplitudes DAk : Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 46 Select Eye/Mask Measurement Mode. Disable the pattern lock. Execute an autoscale. Run the measurement. Wait 20s. On the DCA mainframe, Select the Jitter Measurement Mode. Clear the display. Run the measurement. Wait 15s Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 47 On the reference transmitter module, select the wavelength 1310 nm On the optical wave meter mainframe, note the value for the wavelength in the test record. Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 48 81490A Reference Transmitter Reference Product No. Serial No. _____________________ _____________________ Serial No. Firmware Rev. _____________________ _____________________ Firmware Rev. _____________________ Conditions Ambient temperature ___________________ °C Relative humidity ___________________ % Line frequency ___________________ Hz Special Notes: Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 49 _______________________ _______________________ ______ / ______ / ________ _______________________ _______________________ _______________________ ______ / ______ / ________ _______________________ _______________________ _______________________ ______ / ______ / ________ _______________________ _______________________ _______________________ ______ / ______ / ________ Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 50 At 1550nm, this is    10    measured value [mW] Where IL is the insertion loss of the optical attenuator and patch cord used in the test setup. Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 51 The Fall Time is calculated as follows Measured fall time – DCA intrinsic fall time Measured fall time – 15.91 ps where 15.91 PS is the worst case fall time for the Keysight 86105B Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 52 ________ mW/V 0.2V ________ ps ________ mW ________ mW/V  18.0 ps  5.0 mW/V Limit a The EO conversion ratio is calculated as follows Optical modulation amplitude --------------------------------------------------------------------------------- - Data amplitude Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 53 ________ dB/Hz 0.6V ________ dB/Hz 0.4V ________ dB/Hz 0.2V ________ dB/Hz 1550 nm 1.0V ________ dB/Hz 0.8V ________ dB/Hz 0.6V ________ dB/Hz 0.4V ________ dB/Hz 0.2V ________ dB/Hz  136 dB/Hz Limit Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 54 10 log --------------------------------------------------------------------------------------------------- -   Eye opening (mW)  Measured Limit Wavelength 1540 nm ~ 1550 nm ~1560 nm ________ nm 1300 nm ~ 1310 nm ~1320 nm ________ nm Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 56 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. Cleaning Instructions for this Instrument This Cleaning Information applies to a number of different types of Optical Equipment.

  • Page 57: Safety Precautions

    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 81490A Reference Transmitter Module User’s Guide, Edition 3.0...

  • Page 58: 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 81490A Reference Transmitter Module User’s Guide, Edition 3.0...

  • Page 59: What Do I Need For Proper Cleaning

    If you need further dust caps, please contact your nearest Keysight Technologies sales office. Isopropyl alcohol This solvent is usually available from any local pharmaceutical supplier or chemist's shop. Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 60 Soft tissues These are available from most stores and distributors of medical and hygiene products such as supermarkets or chemists' shops. Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 61 The tip and center of the pipe cleaner are made of metal. Avoid accidentally pressing these metal parts against the inside of the device, as this can cause scratches. Compressed air Compressed air can be purchased from any laboratory supplier. Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 62 You can also use your microscope to judge whether your optical device (such as a connector) is severely scratched and is, therefore, causing inaccurate measurements. Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 63 Using polymer film is a gentle method of cleaning extremely sensitive devices, such as reference reflectors and mirrors. Infrared Sensor Card Infrared sensor cards are available from laboratory suppliers or specialist mail order companies. Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 64 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 81490A Reference Transmitter Module User’s Guide, Edition 3.0...

  • Page 65: Preserving Connectors

    They are liable to impair and dirty the surface of the device. In addition, the characteristics of your device can be changed and your measurement results affected. Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...

  • Page 66: Cleaning Instructions

    To be certain of the condition of the surface of your connector and to check it after cleaning, you need a microscope. Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 67 A better, more gentle, but more expensive cleaning procedure is to use an ultrasonic bath with isopropyl alcohol. Hold the tip of the connector in the bath for at least three minutes. Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 68 Do not use pipe cleaners on optical head adapters, as the hard core of normal pipe cleaners can damage the bottom of an adapter. Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 69 • Deposit dissolved dirt in the groove, which can then dirty the surface of an inserted fiber. Preferred Procedure Use the following procedure on most occasions. Blow away any dust or dirt with compressed air. Keysight 81490A Reference Transmitter Module User’s Guide, Edition...
  • Page 70 Clean the lens by rubbing the cotton swab over the surface using a small circular movement. Using a new, dry cotton swab remove the alcohol, any dissolved sediment and dust. Blow away any remaining lint with compressed air. Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 71 Never look into an optical output, because this can seriously damage WA R N I NG your eyesight. Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 72 Keysight’s service team. Preferred Procedure Use the following procedure on most occasions. Blow away any dust or dirt with compressed air. If this is not sufficient, then Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 73 This procedure is time-consuming, but you avoid scratching or destroying the surface. Put the film on the surface and wait at least 30 minutes to make sure that the film has had enough time to dry. Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 74 10 minutes. Remove the fluid using compressed air at some distance and with low pressure. If there are any streaks or drying stains on the surface, repeat the whole cleaning procedure. Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 75 Preferred Procedure Use the following procedure on most occasions. Blow away any dust or dirt with compressed air. Procedure for Stubborn Dirt Use this procedure when there is greasy dirt on the lens: Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 76 Remove the film and any dirt with special adhesive tapes. Alternative Procedure B If your lens is sensitive to water then: Moisten the lens or the mirror with isopropyl alcohol. Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 77 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 remaining lint with compressed air. Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...

  • Page 78: Other Cleaning Hints

    They are liable to dirty the detector and impair its performance. They may also alter the property of depiction of your optical device, thus rendering your measurements inaccurate. Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 79 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 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 80 Warranty Information All system warranties and support agreements are dependent upon the integrity of the Keysight 81490A Reference Transmitter Module. Any modification of the system software or hardware will terminate any obligation that Keysight Technologies may have to the purchaser. Please contact your local Keysight field engineer before embarking in any changes to the system.
  • Page 81 Keysight offers open connectivity for a broad range of systemready instruments, open industry software, PC-standard I/O and global support, which are combined to more easily integrate test system development. www.keysight.com/find/open Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 82 (tel) 31 20 547 2111 Japan: (tel) (81) 426 56 7832 (fax) (81) 426 56 7840 Korea: (tel) (080) 769 0800 (fax) (080) 769 0900 Latin America: (tel) (305) 269 7500 Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 83 (tel) 0800 047 866 (fax) 0800 286 331 Other Asia Pacific Countries: (tel) (65) 6375 8100 (fax) (65) 6755 0042 Email: tm_ap@keysight.com Product information www.keysight.com/find/ref online www.keysight.com/find/optical_stress Keysight photonic discussion forum www.keysight.com/find/photonic_forum Keysight 81490A Reference Transmitter Module User’s Guide, Edition 3.0...
  • Page 84 This information is subject to change without notice. © Keysight Technologies 2017 Edition 3.0, October 2017 www.keysight.com...

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