Keysight 81960A User Manual
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Keysight 81960A User Manual

Keysight 81960A User Manual

Compact tunable laser source modules
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Keysight 81960A Compact
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User's Guide

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Summary of Contents for Keysight 81960A

  • Page 1 Keysight 81960A Compact Tunable Laser Source Modules User’s Guide...
  • Page 2 THE IMPLIED WARRANTIES OF The license set forth in the EULA represents MERCHANTABILITY AND FITNESS FOR A the exclusive authority by which the U.S. PARTICULAR PURPOSE. KEYSIGHT SHALL government may use, modify, distribute, or Keysight 81960A Compact TLS Module User’s Guide...

  • Page 3: Table Of Contents

    Laser Safety Labels Laser class 1M label Introduction What is a Tunable Laser Source? Installation Front Panels Front Panel Controls and Indicators Typical Use Models Optical Output Polarization Maintaining Fiber Angled and Straight Contact Connectors Keysight 81960A Compact TLS Module User’s Guide...
  • Page 4 Enable or disable DHCP Show the MAC address Restart the networking What is a Tunable Laser? How to Set the Power How to Set the Output Power of a CW Signal What is Excessive Power? Keysight 81960A Compact TLS Module User’s Guide...
  • Page 5 How to Use Output Triggering How to Use Auxiliary Functions Automatic Realignment How to Perform a Lambda Zero 4 Programming Instructions Specific Command Summary Signal Generation – The SOURce Subsystem Measurement Operations & Settings: Keysight 81960A Compact TLS Module User’s Guide...
  • Page 6 Relative wavelength accuracy (stepped mode) Return loss SBS suppression - effective linewidth SBS suppression - residual amplitude modulation (depth) Side-mode suppression ratio Signal to source spontaneous emission (SSE) ratio Signal to total source spontaneous emission ratio Keysight 81960A Compact TLS Module User’s Guide...
  • Page 7 What do I need for proper cleaning? Preserving Connectors How to clean connector interfaces How to clean bare fiber adapters How to clean instruments with a fixed connector interface Additional Cleaning Information Other Cleaning Hints Keysight 81960A Compact TLS Module User’s Guide...

  • Page 9: Getting Started

    Keysight 81960A Compact Tunable Laser Source Module User’s Guide Getting Started This chapter provides a general description of Keysight 81960A Tunable Laser Source Family. Safety Considerations / 10 Initial Safety Information for Tunable Laser Modules / 14 Laser Safety Labels...

  • Page 10: 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 red safety page, for safety markings and instructions.

  • Page 11: Initial Inspection

    Storage and Shipment A Keysight 81960A Compact Tunable 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.

  • Page 12: Protecting Empty Module Slots

    Figure 1 Fitting a Blind Panel Push the top of the blind panel so that it clicks into position. To remove a blind panel, pull the handle. NOTE Keysight 81960A Compact TLS Module User’s Guide...

  • Page 13: Fitting A Filler Module For Back-Loadable Module Slots

    Getting Started Fitting a Filler Module for Back-Loadable Module Slots The Keysight 81960A Filler Module must be used if you have not installed a back-loadable Tunable Laser module into the 8164A/B Lightwave Measurement System. The Keysight 81960A Filler Module can be fitted and removed in the same way as any back-loadable module.

  • Page 14: 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 81960A Compact TLS Module User’s Guide...

  • Page 15: Laser Safety Labels

    • Refer servicing only to qualified and authorized personnel. The built in laser diode is active whenever the instrument is powered on, CAUTION therefore disabling the output is not sufficient to establish eye safe conditions. Keysight 81960A Compact TLS Module User’s Guide...
  • Page 16 Getting Started The remote interlock function interrupts the laser current when the NOTE connector is open. Keysight 81960A Compact TLS Module User’s Guide...

  • Page 17: Introduction

    What is a Tunable Laser Source? A Tunable Laser Source (TLS) is a laser source for which the wavelength can be varied through a specified range. The Keysight 81960A is a TLS with continuous-sweep measurement capabilities, where wavelength and power are regulated while the laser changes wavelength at a constant rate.

  • Page 18: Front Panels

    When the active LED is not lit the output is disabled. The built-in laser diode is active whenever the instrument is powered on, CAUTION therefore disabling the output is not sufficient to establish eye safe conditions. Keysight 81960A Compact TLS Module User’s Guide...

  • Page 19: Typical Use Models

    N7700A IL engine which provides a GUI interface to these functions also support power and IL measurements together with any of the Keysight power meters. And the performance of swept-wavelength measurements in the N4150A PFL, including fast repetitive sweeps, are also supported with this newest member of the Keysight swept tunable lasers.

  • Page 20: Optical Output

    Getting Started Optical Output Polarization Maintaining Fiber A Polarization maintaining fiber (PMF) output is standard for Keysight 81960A Tunable Laser Source Familys. PMF is aligned to maintain the state of polarization. A well defined state of polarization helps ensure constant measurement conditions.

  • Page 21: Angled And Straight Contact Connectors

    Getting Started Angled and Straight Contact Connectors To ensure most accurate measurements, the Keysight 81960A Fast sweeping Compact TLS module is equipped with angled contact connectors. Angled contact connectors help you to control return loss, since reflected light tends to reflect into the cladding, reducing the amount of light that reflects back to the source.

  • Page 23: Accessories

    Keysight 81960A Compact Tunable Laser Source Module User’s Guide Accessories The Keysight 81960A Tunable Laser Source Family 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 24: Modules And Options

    Accessories Modules and Options Figure 6 on page -24 shows all the options that are available for Keysight 81960A Tunable Laser Source Family, and the instruments that support these modules. Figure 6 Mainframes, Tunable Laser Modules and Options Keysight 81960A Compact TLS Module User’s Guide...

  • Page 25: Modules

    Accessories Modules Keysight 81960A, 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. Table 2 Compact Tunable Laser Modules Model Number...
  • Page 26 Angled Contact Connector Interfaces Description Model Number E-2000 APC Keysight 81000 HI SC/APC Keysight 81000 KI FC/APC Keysight 81000 NI (narrow key) Keysight 81000 FI (wide key) DIN 47256 / 4108.6 Keysight 81000 SI Keysight 81960A Compact TLS Module User’s Guide...

  • Page 27: User's Guides

    The following User’s Guides are applicable to these Tunable Laser Source Family: Table 4 User’s Guides Description Model Number Keysight 81960A Compact Tunable Laser Source module User’s 81960-90B01 Guide. 8163A/B Lightwave Multimeter, 8164A/B Lightwave 08164-90B16 Measurement System, & 8166A/B Lightwave Multichannel System User’s Guide.

  • Page 29: Operating Instructions

    Keysight 81960A Compact Tunable Laser Source Module User’s Guide Operating Instructions This chapter explains how to control Tunable Laser modules from the user interface of the 8163A/B Lightwave Multimeter, the 8164A/B Lightwave Measurement System, and the 8166A/B Lightwave Multichannel System.

  • Page 30: The Graphical User Interface

    If the instrument is locked, the status line shows “SL” (8163 A/B, 8166 A/B) or “SLock” (8164 A/B). The instrument can also be locked and unlocked using a remote NOTE command: “LOCK 0|1, <password>”. Example: unlock the instrument using password “1234”: lock 0,1234 Keysight 81960A Compact TLS Module User’s Guide...

  • Page 31: How To Set A Parameter

    Not all parameters are available in all operation modes or instrument NOTE states. • If a parameter is not displayed on the screen, it can alternatively be accessed using the [Menu] soft key, which opens a menu with all currently available parameters: Keysight 81960A Compact TLS Module User’s Guide...
  • Page 32 Operating Instructions Figure 7 Keysight 81960A Compact TLS Module User’s Guide...

  • Page 33: The User Interface

    The module's front panel LED is used to inform about the state of the module: Table 5 LED State Model State blinking slowly (at boot time) initializing hardware blinking fast boot error laser is off laser is on, frequency and power are stable Keysight 81960A Compact TLS Module User’s Guide...

  • Page 34: Lan Interface

    DHCP server is available and the DHCP mode is enabled. The LAN interface The LAN Connector is on the back of the mainframes. Figure 8 The LAN interface on the 8163B mainframe Keysight 81960A Compact TLS Module User’s Guide...

  • Page 35: Connections

    Socket and telnet connections are independent of each other. • The status registers are updated if a new socket or telnet connection is opened. • Be careful if there is more than one connection: Keysight 81960A Compact TLS Module User’s Guide...
  • Page 36 It is the programmer’s responsibility to make sure all the transmitted data is read. • The Keysight VISA Assistant is confused by ‘newline’ inside a reply. In this case, click the button [viScanf] until the whole reply is read. •...

  • Page 37: User Interface

    Operating Instructions User Interface Some new entries have been added to the Configuration menu, which can be opened with the [Config] hard key: Figure 10 Setting Attenuation Keysight 81960A Compact TLS Module User’s Guide...

  • Page 38: Show The Current Lan Settings

    “Edit LAN Settings” dialog. The message box does not update automatically. To update the values, press the [Close] soft key then select “Current LAN Settings” again. Keysight 81960A Compact TLS Module User’s Guide...

  • Page 39: Edit Lan Settings

    Settings” in the “Configuration Menu”, then press the [OK] soft key. Figure 12 Ed it the IP address Use the cursor keys (or the modify knob and the numeric keypad on the 8164B) to edit the IP address. Figure 13 Keysight 81960A Compact TLS Module User’s Guide...
  • Page 40 The modify knob on the 8164B works like the [up] and [down] buttons. Figure 14 Ed it the default gateway Use the cursor keys (or the modify knob and the numeric keypad on the 8164B) to edit the IP address. Figure 15 Keysight 81960A Compact TLS Module User’s Guide...
  • Page 41 If you try to enter a character which would create an invalid host name, the instrument beeps. • If enter an empty host name, the host name is reset to its default value. Keysight 81960A Compact TLS Module User’s Guide...
  • Page 42 • The [OK] soft key is disabled until the value in the editor is valid. • If you try to enter a character which would create an invalid domain name, the instrument beeps. Keysight 81960A Compact TLS Module User’s Guide...

  • Page 43: Enable Or Disable Dhcp

    Use the cursor keys (or the modify knob on the 8164B) to select –“Off” if you want to disable DHCP, or –“On” if you want to enable DHCP. Press the [OK] soft key. Figure 19 Keysight 81960A Compact TLS Module User’s Guide...

  • Page 44: Show The Mac Address

    Use the cursor keys (or the modify knob on the 8164B) to select “Show MAC Address” in the “Configuration Menu” and press the [OK] soft key to open a box displaying the network adapters MAC address. Figure 20 Figure 21 Keysight 81960A Compact TLS Module User’s Guide...

  • Page 45: Restart The Networking

    If you have changed network parameters and want to apply them, use the cursor keys (or the modify knob on the 8164B) to select “Restart network” in the “Configuration Menu”, then press the [OK] soft key. Figure 22 Keysight 81960A Compact TLS Module User’s Guide...

  • Page 46: What Is A Tunable Laser

    What is a Tunable Laser? A tunable laser is a laser source for which the wavelength can be varied through a specified range. The Keysight Technologies Tunable Laser modules also allow you to set the output power, and to choose between continuous wave or modulated power.

  • Page 47: What Is Excessive Power

    If the text ExP is displayed in a Tunable Laser channel, see Figure 24 page -48, you have set an output power level that is larger than the laser diode can produce at the selected wavelength. Keysight 81960A Compact TLS Module User’s Guide...
  • Page 48 • press [Pmax] to select the highest permissible power for the selected wavelength value, or • press [Pmax/Swp] to select the highest permissible power for the selected wavelength sweep. Keysight 81960A Compact TLS Module User’s Guide...

  • Page 49: How To Set The Wavelength

    You can set a wavelength range for the instrument to “sweep”. Wavelength Range Every Tunable Laser module has a specified wavelength range. This range is available for all Tunable Laser modules. See “Keysight 81980A, 81960A, 81940A, 81989A, 81949A, and 81950A Compact Tunable Laser Sources Data Sheet, publication number 5988-8518EN”.

  • Page 50: How To Perform A Wavelength Sweep

    51. For a <Continuous> sweep, [Step] sets the wavelength interval between NOTE output triggers, if you have set <Output Trigger Mode> to <Step Finished>, see on page 64. How to Use Output Triggering Keysight 81960A Compact TLS Module User’s Guide...
  • Page 51 Select <Oneway>, if you want to start every sweep cycle at [ Start] and λ to end every sweep cycle at [ Stop]. Figure 27 on page -51 illustrates how these modes work for a three-cycle wavelength sweep. Figure 27 Repeat Modes Keysight 81960A Compact TLS Module User’s Guide...

  • Page 52: How To Perform A Sweep

    10 Move to [Repeat Mode] and press Enter. 11 Move to <Twoway>, by using the cursor key, and press Enter. 12 Move to [Step] and press Enter. 13 Enter 1.000 and press Enter. Keysight 81960A Compact TLS Module User’s Guide...
  • Page 53 [Pause] to pause the sweep. The screen in Figure 16 appears. You can: • Press [Continue] to continue sweeping automatically. • Press [Prev] or [Next] to sweep manually. • Press [Stop] to end the sweep. Figure 28 Executing a Stepped Sweep Keysight 81960A Compact TLS Module User’s Guide...
  • Page 54 Pausing a Stepped Sweep How to Execute a Continuous Sweep The 81960A supports sweep speeds 0.5, 1, 2, 5, 10, 20, 40, 50, 80, 100 NOTE and 200 nm/s. The step width can be set with a resolution of 0.1pm. The step duration, determined by the width and the sweep speed, can be as short as 1μs.
  • Page 55 <=LambdaStart 369, sweepTime < min the total time of the sweep is too small 370, sweepTime > max the total time of the sweep is too large Keysight 81960A Compact TLS Module User’s Guide...
  • Page 56 Press the [Active] hardkey on the front panel of your Tunable Laser module to enable the optical output. Press [Run Swp] to start the sweep. The screen in Figure 30 page -57 then appears. Keysight 81960A Compact TLS Module User’s Guide...
  • Page 57 [Prev] to move on to the previous wavelength step, or • press [Stop] to end the sweep. Figure 30 Performing a Manual Sweep Perform step 6 until you choose to press [Stop]. Keysight 81960A Compact TLS Module User’s Guide...

  • Page 58: How To Modulate A Signal

    Enter. How to Set the Frequency of a Modulated Signal To set the frequency of the modulation to 6.500 kHz: Move to the frequency parameter, [Mod Frq], press Enter. Enter 6.500 press Enter. Keysight 81960A Compact TLS Module User’s Guide...

  • Page 59: How To Use External Modulation

    Trigger Feedback from another module in the same mainframe. • <Coherence Ctrl.> - Coherence Control External Analog Modulation is not supported by the 81960A. The NOTE Command and Mainframe Menu point is included for compatibility. External Digital Modulation using Input Trigger Connector External digital modulation uses a TTL-level signal.
  • Page 60 NOTE <Backplane>, is chosen as the modulation source, [Mod Src], the average power of the output signal of the Keysight 81960A Tunable Laser module varies in proportion with the change in duty cycle. To enable external digital modulation using the Input Trigger Connector: Move to the Tunable Laser channel and press [Details].

  • Page 61: Sbs Suppression

    Move to the Tunable Laser channel and press the [Details] softkey. Set appropriate values in the Freq. Modulation box: • The Frq Mod scr > SBS-Ctrl field is fixed, since SBS-Ctrl is the only frequency modulation source currently available. Keysight 81960A Compact TLS Module User’s Guide...
  • Page 62 Set a value for the SBS suppression control frequency, SBSC frq, appropriate to your application. • Set a value for the SBS suppression control level, SBSC lvl, appropriate to your application. Figure 33 Updated Tunable Laser channel Details including SBS Suppression Keysight 81960A Compact TLS Module User’s Guide...

  • Page 63: How To Use Triggers

    Move to the Tunable Laser channel and press [Menu]. Move to <Input Trigger Mode>, by using the cursor key, and press ENTER. You will see the screen in Figure 34 on page -63. Figure 34 Input Trigger Mode Keysight 81960A Compact TLS Module User’s Guide...

  • Page 64: How To Use Output Triggering

    Move to the Tunable Laser channel and press [Menu]. Move to <Output Trigger Mode>, by using the cursor key, and press Enter. You will see the screen in Figure 35 on page -65. Keysight 81960A Compact TLS Module User’s Guide...
  • Page 65 <Sweep Started>, a trigger is output after a sweep cycle starts. Press Enter If you choose <Step Finished> and a <Continuous> sweep, the NOTE wavelength interval between hard ware triggers is set by the [Step] parameter, although, the sweep is not stepped. Keysight 81960A Compact TLS Module User’s Guide...

  • Page 66: How To Use Auxiliary Functions

    Move to the Tunable Laser channel and press Menu. Move to <Realign> and press [OK]. You will see the screen in Figure 36 on page -66. Wait several minutes. Figure 36 Realign Screen Keysight 81960A Compact TLS Module User’s Guide...

  • Page 67: How To Perform A Lambda Zero

    Zeroing> and press [OK]. You will see the screen in Figure on page -67. λ Figure 37 Zeroing Screen Wait several minutes. To get the specified performance, ensure that the warm-up time has NOTE passed before starting Lambda Zero. Keysight 81960A Compact TLS Module User’s Guide...
  • Page 68 Operating Instructions Execute a Lambda Zero when the operating temperature has significantly NOTE changed after last Lambda Zero or after Storage or Transport. Keysight 81960A Compact TLS Module User’s Guide...

  • Page 69: Programming Instructions

    Keysight 81960A Compact Tunable Laser Source Module User’s Guide Programming Instructions This chapter describes the SCPI Commands for use of 81960A compact tunable laser modules. Specific Command Summary / 70...

  • Page 70: Specific Command Summary

    :DGATeway:CURRent? Get the currently used default gateway. Page 77 :DHCP:ENABle Enable or disable DHCP. Page 78 :DHCP:ENABle? Check whether DHCP is enabled or Page 78 disabled. :HOSTname Set the host name. Page 78 Keysight 81960A Compact TLS Module User’s Guide...
  • Page 71 Page 87 system :STATe[λ]/? Turns Amplitude Modulation of a source on Page 88 or off or queries whether Amplitude Modulation is on or off. :COHCtrl:COHLevel[λ]/? Sets or returns the coherence level. Page 90 Keysight 81960A Compact TLS Module User’s Guide...
  • Page 72 Returns the data as a binary stream from Page 98 either a lambda logging operation or the maximum power the laser can produce at each wavelength. [:SOURce[n]][:CHANnel[m]:]WAVelength [:CW[λ]:FIXED] Sets the absolute wavelength of a source. Page 98 Keysight 81960A Compact TLS Module User’s Guide...
  • Page 73 Sets or returns the sweep mode. Page 110 :PMAX? Returns the highest permissible power for a Page 110 wavelength sweep. :REPeat/? Sets or returns the repeat mode Page 111 :SOFTtrigger Sends a soft trigger. Page 112 Keysight 81960A Compact TLS Module User’s Guide...
  • Page 74 This means the number of possible connections is reduced by the number of previously open connections. However, the instrument does make sure connections are still alive. It should release unused open connections after about two minutes. Keysight 81960A Compact TLS Module User’s Guide...
  • Page 75 There will be an error if you try to query these parameters if the network is not connected, or before they have been set by the DHCP server. Example: >> syst:comm.:eth:ipad:curr? >> [time-out] >> syst:err? << -252, “Not allowed while (re)starting network Keysight 81960A Compact TLS Module User’s Guide...
  • Page 76 Description: Get the current host name. The default host name is A-P...P-S...S; where A is for Keysight, P...P is the Product Number, and S...S is as many of the last digits of the Serial Number to get a 15 character host name.
  • Page 77 Ethernet parameters become effective. If you query one of the alterable parameters, you always get the most recently set value, even if you have not yet activated it. Keysight 81960A Compact TLS Module User’s Guide...
  • Page 78 15 character host name. If you set an empty host name (““), the host name will be set to its default value. Response: none Example: :syst:comm:eth:host “my8163B” Keysight 81960A Compact TLS Module User’s Guide...
  • Page 79 ".". Groups with leading zeroes are interpreted as octal numbers.) Response: none Example: :syst:comm:eth:ipad “192.132.13.2” Command: :SYSTem:COMMunicate:ETHernet:IPADdress? Syntax: :SYSTem:COMMunicate:ETHernet:IPADdress? Description: Get the manually set IP address of the system. Parameters: none Response: string Example: :syst:comm:eth:ipad? “192.132.13.2”<END> Keysight 81960A Compact TLS Module User’s Guide...
  • Page 80 Set the subnet mask. Parameters: string (Up to four groups of up to 3 digits, groups separated by ".". Groups with leading zeroes are interpreted as octal numbers.) Response: none Example: :syst:comm:eth:smas “255.255.255.0“ Keysight 81960A Compact TLS Module User’s Guide...
  • Page 81 (Up to four groups of up to 3 digits, groups separated by ".". Groups with leading zeroes are interpreted as octal numbers.) Response: none Example: :syst:comm:eth:dgat “192.168.101.11“ Command: :SYSTem:COMMunicate:ETHernet:DGATeway? Syntax: SYSTem:COMMunicate:ETHernet:DGATeway? Description: Get the default gateway. Parameters: none Response: string Example: :syst:comm:eth:dgat? “192.168.101.11“<END> Keysight 81960A Compact TLS Module User’s Guide...
  • Page 82 Queries whether the module slot is empty. Parameters: none Response: A boolean value: 0: there is a module in the slot 1: the module slot is empty Example: slot1:empt? --> 0<END> There is a module in slot1 Keysight 81960A Compact TLS Module User’s Guide...
  • Page 83 • Refer to IDN for information on mainframe identity strings. Command: :SLOT[n]:OPTions? Syntax: :SLOT[n]:OPTions? Description: Returns information about a module’s options. Parameters: none Response: A string. Example: slot1:opt? --> NO CONNECTOR OPTION, NO INSTRUMENT OPTIONS<END> Keysight 81960A Compact TLS Module User’s Guide...

  • Page 84: Signal Generation - The Source Subsystem Measurement Operations & Settings

    Switches the laser of the chosen source on or off. Parameters: 0 or OFF: switch laser off 1 or ON: switch laser on Response: none Example: outp1 1 Same functionality as [:SOURce[n]][:CHANnel[m]]:POWer:STATe. NOTE Keysight 81960A Compact TLS Module User’s Guide...
  • Page 85 The default units are HHZ, although KHZ, MHZ, GHZ, and THZ can also be specified. The resolution of the frequency is always 1 Hz. Response: none Example: sour2:am:freq 270hz Keysight 81960A Compact TLS Module User’s Guide...
  • Page 86 The default value of [λ] is 1, the lower wavelength source. The upper wavelength source is denoted by 2. Keysight 81960A Compact TLS Module User’s Guide...
  • Page 87 Connector Response: none Example: sour2:am:sour int External Analog Modulation is not supported by the 81960A. The Command and Mainframe Menu point is included for compatibility. Use [ ] to set the modulation source of the upper or lower wavelength λ...
  • Page 88 ON or 1: amplitude modulation enabled. When you enable lambda logging, see [:SOURce[n]][:CHANnel[m]]:WAVelength:SWEep:LLOGging? on page 109 , and modulation simultaneously, a sweep cannot be started, see [:SOURce[n]][:CHANnel[m]]:WAVelength:SWEep:[STATe] on page 115 . Response: none Example: sour2:am:stat 0 Keysight 81960A Compact TLS Module User’s Guide...
  • Page 89 The default value of [λ] is 1, the lower wavelength source. The upper wavelength source is denoted by 2. Keysight 81960A Compact TLS Module User’s Guide...
  • Page 90 (0%) MAX: returns the maximum programmable value (100%) DEF: returns the default preset (*RST) value. Response: Returns the currently set excursion level as a percentage between 0 and 99.98 Example: source2:am:cohc? --> 50<END> Keysight 81960A Compact TLS Module User’s Guide...
  • Page 91 SBS effects within high-power measurement setups. Command: [:SOURce[n]][:CHANnel[m]]:FM:SOURce[λ]? Syntax: [:SOURce[n]][:CHANnel[m]]:FM:SOURce[λ]? Description: Queries the type of frequency modulation currently set. Currently, only SBS Control is available. Parameters: none Response: SBS Control Example: sour2:fm:sour? --> +0<END> Keysight 81960A Compact TLS Module User’s Guide...
  • Page 92 [:SOURce[n]][:CHANnel[m]]:FM:STATe[λ]? Description: Queries the current state of frequency modulation of the laser output. Parameters: none Response: A boolean value: 0: frequency modulation is disabled 1: frequency modulation is enabled. Example: sour2:fm:state? --> +1<END> Keysight 81960A Compact TLS Module User’s Guide...
  • Page 93 MIN: returns the minimum programmable value MAX: returns the maximum programmable value DEF: returns the default preset (*RST) value. Response: The modulation frequency in Hz as a float value Example: sour2:fm:freq? --> +4.00000E+03<END> Keysight 81960A Compact TLS Module User’s Guide...
  • Page 94 MIN: returns the minimum programmable value (0%) MAX: returns the maximum programmable value (100%) DEF: returns the default preset (*RST) value. Response: Returns the currently set excursion level as a percentage of its maximum value. Example: sour2:fm:sbsc:lev? --> +8.000E+01<END> Keysight 81960A Compact TLS Module User’s Guide...
  • Page 95 0: Laser Off 1: Laser On Example: sour2:pow:stat? --> 1<END> Command: [:SOURce[n]][:CHANnel[m]]:POWer:UNIT Syntax: [:SOURce[n]][:CHANnel[m]]:POWer:UNIT<wsp>DBM|0|Watt|1 Description: Sets the power units Parameters: 0 or DBM: dBm (default) 1 or W: Watts Response: none Example: sour2:pow:unit w Keysight 81960A Compact TLS Module User’s Guide...
  • Page 96 4-byte long float (the power value). The stream is in Intel byte order. Response: A binary stream in Intel byte order. Example: sour2:read:data? llog --> the data as a binary stream Keysight 81960A Compact TLS Module User’s Guide...
  • Page 97 If your application requires more data points please use SOURce[n]][:CHANnel[m]]:READout:DATA:BLOCk? instead of SOURce[n]][:CHANnel[m]]:READout:DATA? Parameters: none Response: The maximum number of data points (not bytes!) in the transferred block, as an integer value. Example: sour0:read:data:maxb? --> 120<END> Keysight 81960A Compact TLS Module User’s Guide...
  • Page 98 MAX: maximum wavelength value DEF: This is not the preset (*RST) default value but is half the sum of, the minimum wavelength value and the maximum wavelength value Response: none Example: sour2:wav 1550NM Keysight 81960A Compact TLS Module User’s Guide...
  • Page 99 Use [λ] to query the upper or lower wavelength laser source of a NOTE dual-wavelength laser source. The default value of [λ] is 1, the lower wavelength source. The upper wavelength source is denoted by 2. Keysight 81960A Compact TLS Module User’s Guide...
  • Page 100 Realigns the laser cavity of every tunable laser source in a mainframe. Parameters: none Response: none Example: sour0:wav:corr:ara:all Command: [:SOURce[n]][:CHANnel[m]]:WAVelength:CORRection:ZERO Syntax: [:SOURce[n]][:CHANnel[m]]:WAVelength:CORRection:ZERO Description: Executes a wavelength zero. Parameters: none Response: none Example: sour2:wav:corr:zero Keysight 81960A Compact TLS Module User’s Guide...
  • Page 101 The default value of [λ] is 1, the lower wavelength source. The upper wavelength source is denoted by 2. Keysight 81960A Compact TLS Module User’s Guide...
  • Page 102 The upper wavelength source is denoted by 2. Command: [:SOURce[n]][:CHANnel[m]]:WAVelength:REFerence[λ]? Syntax: [:SOURce[n]][:CHANnel[m]]:WAVelength:REFerence[λ]? Description: Returns the reference wavelength (λ Parameters: none Response: The wavelength as a float value in meters. Example: sour2:wav:ref? --> +1.5500000E-006<END> Keysight 81960A Compact TLS Module User’s Guide...
  • Page 103 373,triggerNum > max the number of triggers exceeds the allowed limit 374,LambdaLogging = The only allowed modulation source with the On AND Modulation = lambda logging function is coherence control. On AND ModulationSource! = CoherenceControl Keysight 81960A Compact TLS Module User’s Guide...
  • Page 104 DEF: This is not the preset (*RST) default value but is half the sum of, the minimum programmable value and the maximum programmable value 0: cycles continuously. Response: none Example: wav:swe:cycl 3 Cannot be set while a sweep is running. NOTE Keysight 81960A Compact TLS Module User’s Guide...
  • Page 105 DEF: This is not the preset (*RST) default value but is half the sum of, the minimum programmable value and the maximum programmable value Response: none Example: wav:swe:d wel 500ms Cannot be set while a sweep is running. NOTE Keysight 81960A Compact TLS Module User’s Guide...
  • Page 106 Power Meter for coordinated measurements with a tunable laser source. Parameters: none Response: the number of expected triggers as an unsigne integer value. Example: sour0:wav:swe:exp? --> 12001 Keysight 81960A Compact TLS Module User’s Guide...
  • Page 107 | logging data available sweep waiting for next trigger ..sweep stopped or finished Parameters: none Response: the current sweep flag value as an unsigned integer value Example: sour0:wav:swe:flag? --> 30 Keysight 81960A Compact TLS Module User’s Guide...
  • Page 108 If any of the above prerequisites are not met, then when the sweep is started the status "Sweep parameters inconsistent" will be returned and Lambda Logging will automatically be turned off. Lambda logging is disabled at the end of a sweep. NOTE Keysight 81960A Compact TLS Module User’s Guide...
  • Page 109 1 – lambda logging is switched on example: wav:swe:llog? --> 1<END> Command: [:SOURce[n]][:CHANnel[m]]:WAVelength:SWEep:MODE Syntax: [:SOURce[n]][:CHANnel[m]]:WAVelength:SWEep:MODE<wsp><mode> Description: Sets the sweep mode. Parameters: STEPped: Stepped sweep mode MANual: Manual sweep mode CONTinuous: Continuous sweep mode Response: none Example: wav:swe:mode STEP Keysight 81960A Compact TLS Module User’s Guide...
  • Page 110 The wavelength at which the sweep starts as a float wavelength: value. Response: The highest permissible power for the selected wavelength sweep as a float value. Example: wav:swe:pmax? 1540nm,1550nm --> +3.5500000E-004<END> Keysight 81960A Compact TLS Module User’s Guide...
  • Page 111 [:SOURce[n]][:CHANnel[m]]:WAVelength:SWEep:REPeat Syntax: [:SOURce[n]][:CHANnel[m]]:WAVelength:SWEep:REPeat<wsp><mode> Description: Sets the repeat mode. Applies in stepped-sweep and manual-sweep modes. The 81960A also supports the "TWOWay" Mode in Continuous sweep mode. Parameters: Every stepped or continuous sweep cycle starts at the start Way: wavelength of the sweep and ends at the stop wavelength of...
  • Page 112 [NM/S|UM/S|MM/S|M/S|] Description: Sets the speed for continuous sweeping. Parameters: Speed as a float value in meters per second (m/s). Response: none Example: wav:swe:spe 10nm/s Cannot be set while a sweep is running. NOTE Keysight 81960A Compact TLS Module User’s Guide...
  • Page 113 Programming Instructions The 81960A supports speeds of 0.5, 1, 2, 5, 10, 20, 40, 50, 80, 100 and NOTE 200 nm/s. A higher speed needs a longer acceleration/deceleration span. This can reduce the usable sweep range, available sweep power and repetition rate.
  • Page 114 The wavelength at which the sweep ends as a float value in meters. If you specify no units in your command, meters are used as the default. Response: none Example: wav:swe:stop 1550nm Cannot be set while a sweep is running. NOTE Keysight 81960A Compact TLS Module User’s Guide...
  • Page 115 <=100001 the start wavelength is less than the stop wavelength. In addition, a continuous sweep with lambda logging requires: the trigger output to be set to step finished modulation set to coherence control or off. Keysight 81960A Compact TLS Module User’s Guide...
  • Page 116 Parameters: none Response: none Example: wav:swe:step:next Command: [:SOURce[n]][:CHANnel[m]]:WAVelength:SWEep:STEP:PREVious Syntax: [:SOURce[n]][:CHANnel[m]]:WAVelength:SWEep:STEP:PREVious Description: Performs one sweep step backwards in stepped sweep if it is paused or in manual sweep Parameters: none Response: none Example: wav:swe:step:prev Keysight 81960A Compact TLS Module User’s Guide...
  • Page 117 Example: wav:swe:step 5nm The step of the 81960A can be set with a resolution of 0.1 pm. The NOTE duration of a step in continuous sweep mode, dependent on the step width and sweep speed, can be set as short as 1 µs.
  • Page 119 Keysight 81960A Compact Tunable Laser Source Module User’s Guide Specifications Keysight 81960A Tunable Laser Source Family 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 120 (given by start wavelength, end wavelength and sweep speed). During a continuous sweep the dynamic specifications and the “Logged wavelength” (see above) applies. Keysight 81960A Compact TLS Module User’s Guide...
  • Page 121 Using a wavelength meter, averaging time 1 s. The absolute wavelength accuracy of the low -SSE output (if applicable) NOTE is the same as the absolute wavelength accuracy of the high power output (guaranteed by design). Keysight 81960A Compact TLS Module User’s Guide...
  • Page 122 Cond itions: Uninterrupted tunable laser source output power, constant power setting, constant temperature, no mode-hop. Other conditions as specified. Measurement: Reference sweep speed value 0.5 nm/s. Keysight 81960A Compact TLS Module User’s Guide...
  • Page 123 The electrical noise spectrum of the photo-detector current is measured with a Keysight Lightwave signal analyzer, and the linewidth calculated from the heterodyne spectrum (Lightwave signal analyzer settings: resolution bandwidth 1 MHz, video bandwidth 10 kHz, sweep time 20 ms, single scan).
  • Page 124 The electrical noise spectrum of the photodetector current is measured with Keysight lightwave signal analyzer, and the linewidth is calculated from the heterodyne spectrum. Alternatively, Using a heterodyning technique: The output of the laser under test is mixed with another laser of the same type on a wide bandwidth photo-detector.
  • Page 125 The ambient temperature range and humidity range of the tunable laser source for which the specifications apply. If the optical mainframe hosting the tunable laser source module is NOTE rack-mounted the temperature and humidity within the rack apply. Keysight 81960A Compact TLS Module User’s Guide...
  • Page 126 Poincaré sphere. Calculate the polarization extinction ratio from the diameters of these circles. Figure 41 Circular traces on the Poincaré sphere used to calculate polarization extinction ratio Keysight 81960A Compact TLS Module User’s Guide...
  • Page 127 ± half the difference between the maximum and the minimum value of all ratios. Figure 43 Power linearity Keysight 81960A Compact TLS Module User’s Guide...
  • Page 128 Specifies the change of the power level of the tunable laser source over time, expressed as ± half the span (in dB) between the highest and lowest actual power. Figure 44 Power stability Keysight 81960A Compact TLS Module User’s Guide...
  • Page 129 RIN, if expressed as “dB/Hz”, is calculated by: Cond itions: As specified. Measurement: Using a Keysight Lightwave signal analyzer and bandwidth set to 3 MHz. Relative wavelength accuracy (continuous sweep mode) When measuring the differences between the actual and Logged...
  • Page 130 Using a wavelength meter , averaging time 1 s. The relative wavelength accuracy of the low -SSE output (if applicable) is NOTE the same as the relative wavelength accuracy of the high power output (guaranteed by design). Keysight 81960A Compact TLS Module User’s Guide...
  • Page 131 Modulation depth is a value between 0 and 100%. NOTE Side-mode suppression ratio The ratio of optical power in the main mode to the optical power of the highest sidemode, expressed in dB: Cond itions: As specified. Keysight 81960A Compact TLS Module User’s Guide...
  • Page 132 Specifications Measurement: Using the Keysight Lightwave signal analyzer, by analyzing the heterodyning between the main signal and the highest sidemode within 0.1 GHz to 6 GHz. Signal to source spontaneous emission (SSE) ratio Specifies the ratio between signal power and maximum spontaneous emission (SSE) power.
  • Page 133 For the low-SSE output, if applicable, with a fiber Bragg grating inserted between the tunable laser source and the OSA to suppress the signal, thereby enhancing the dynamic range of the OSA. Keysight 81960A Compact TLS Module User’s Guide...
  • Page 134 The random uncertainty in reproducing a wavelength of the tunable laser source after changing and re-setting the wavelength. The wavelength repeatability is ± half the span between the maximum and the minimum of all actual values of this wavelength. Keysight 81960A Compact TLS Module User’s Guide...
  • Page 135 Cond itions: Time span as specified, uninterrupted tunable laser source output power, constant wavelength and power level settings, constant temperature. Other conditions as specified. Measurement: ≥ Using a wavelength meter, averaging time 1 s. Keysight 81960A Compact TLS Module User’s Guide...
  • Page 136 Describe product performance that is usually met but not guaranteed. Supplementary performance characteristics: Describe the module’s non-warranted typical performance. Because of the modular nature of the instrument, these performance specifications apply to these modules rather than the mainframe unit. Keysight 81960A Compact TLS Module User’s Guide...
  • Page 137 4. Value for 1 nm resolution bandwidth. 5. Value for 0.1 nm resolution bandwidth. 7. For sweep range 1510 nm to 1625 nm. For 200 nm/s, sweep range is 1528 nm to 1608 nm. Keysight 81960A Compact TLS Module User’s Guide...
  • Page 138 SBS suppression Effective linewidth: 500 MHz Residual amplitude modulation: <±0.5% Continuous Sweep Mode Mode-hop free sweeping Full wavelength range at flat output power ≥ +10 dBm Ambient temperature within +20 °C and +30 °C Keysight 81960A Compact TLS Module User’s Guide...
  • Page 139 16 dB typical Recommended re-calibration period 2 years Connector option (required) Tunable laser must be ordered with connector option Option 072 PMF, angled contact output connector Connector interface One Keysight 81000xI-Series connector interface is required Keysight 81960A Compact TLS Module User’s Guide...
  • Page 141 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. Cleaning Instructions...
  • Page 142 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. Safety Precautions •...
  • Page 143 If you need further dust caps, please contact your nearest Keysight Technologies sales office. If you need further dust caps, please contact your nearest Keysight Technologies sales office. Keysight 81960A Compact TLS Module User’s Guide...
  • Page 144 Swabs should be used straight out of the packet, and never used twice. This is because dust and dirt in the atmosphere, or from a first cleaning, may collect on your swab and scratch the surface of your optical device. Keysight 81960A Compact TLS Module User’s Guide...
  • Page 145 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. Keysight 81960A Compact TLS Module User’s Guide...
  • Page 146 You can use a microscope to choose an appropriate cleaning method, and then to examine the results. 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 81960A Compact TLS Module User’s Guide...
  • Page 147 Polymer film Polymer film is available from laboratory suppliers or specialist mail order companies. Using polymer film is a gentle method of cleaning extremely sensitive devices, such as reference reflectors and mirrors. Keysight 81960A Compact TLS Module User’s Guide...
  • Page 148 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 149 Never look into the end of an optical cable that is connected to an active WARNING source. Keysight 81960A Compact TLS Module User’s Guide...
  • Page 150 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. Keysight 81960A Compact TLS Module User’s Guide...
  • Page 151 They can 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 81960A Compact TLS Module User’s Guide...
  • Page 152 This will degrade the performance of your transmission system. 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 81960A Compact TLS Module User’s Guide...
  • Page 153 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. For further information, please contact your local Keysight Technologies representative. Making the connection Before you make any connection you must ensure that all lightwave cables and connectors are clean.
  • Page 154 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 81960A Compact TLS Module User’s Guide...
  • Page 156 This information is subject to change without notice. © Keysight Technologies 2020 Edition 5.1, October 2020 www.keysight.com...

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