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ILX Lightwave LDC-3916330 Series User Manual

Dual laser diode current source modules
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1-866-396-6248
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is the one-stop shop for all your fiber optic test equipment and measurement needs. As we are
exclusively focused on e-commerce and international distribution of photonic products since 2000, our customers rely on
the
AssetRelay
catalog to find our stock listings of thousands of used and refurbished popular test equipment. They know
they can get repair, customization and calibration services from our laboratory for their own fiber optic instruments from all
renowned brand manufacturers.
If you wish to buy an ILX Laser Controller or current source module or would consider another brand, visit our catalog
to see our current stock with actual photos.
ILX LDC-391633x series current source modules. Trust the Simbol Test
With more than 20 years of expertise in repair of OSA, Tunable Lasers, Wavemeters, Laser drivers and controllers, and
many more, the quality of our services is renowned amongst the service centers community and highly appreciated by our
partners and customers. We developed custom software allowing fast testing of Laser controllers racks and modules.
Each module is tested with a butterfly laser attached to it to ensure all its control functions are per specifications. Each
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Simbol Test Systems ILX Laser current sources LDC-3991633x modules testing
The ILX LDC-391633x series current source modules sold by AssetRelay or Serviced by Simbol Test Systems will go
through a series of tests to ensure they meet or exceed manufacturer's published specifications. The equipment is shipped
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the machine. Module numbers are LDC-3916332, LDC-3916334 and LDC-3916338.
ILX LDC-391633x tests performed:
- Current Driver Operational Test
- Full Scale Current Source at max Range
- Current Limit
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  • Page 1 BUY – SELL – REPAIR – CALIBRATE sales@simbol.ca 1-866-396-6248 Simbol Test Systems is the one-stop shop for all your fiber optic test equipment and measurement needs. As we are exclusively focused on e-commerce and international distribution of photonic products since 2000, our customers rely on AssetRelay catalog to find our stock listings of thousands of used and refurbished popular test equipment.
  • Page 2 User’s Guide Dual Laser Diode Current Source Modules LDC-3916330 Series ILX Lightwave Corporation P. O. Box 6310 Bozeman, MT, U.S.A. 59771 · · · U.S. & Canada 1-800-459-9459 · International Inquiries: 406-586-1244 Fax 406-586-9405 · E-mail: support@ilxlightwave.com www.ilxlightwave.com 70028103_7/01...

  • Page 4: Safety And Warranty Information

    • Prolonged storage under adverse conditions • Failure to perform intended measurements or functions If necessary, return the instrument to ILX Lightwave, or authorized local ILX Lightwave distributor, for service or repair to ensure that safety features are maintained. All instruments returned to ILX Lightwave are required to have a Return Authorization Number assigned by an official representative of ILX Lightwave Corporation.

  • Page 5: Safety Marking Symbols

    Technical specifications including electrical ratings and weight are included within the manual. See the Table of Contents to locate the specifications and other product information. The following classifications are standard across all ILX Lightwave products: • Indoor use only • Ordinary Protection: This product is NOT protected against the harmful ingress of moisture.

  • Page 6: Warranty

    Returning an Instrument If an instrument is to be shipped to ILX Lightwave for repair or service, be sure to: Obtain a Return Authorization number (RA) from ILX Customer Service. Attach a tag to the instrument identifying the owner and indicating the required service or repair.

  • Page 7: Comments, Suggestions, And Problems

    Comments, Suggestions, and Problems To ensure that you get the most out of your ILX Lightwave product, we ask that you direct any product operation or service related questions or comments to ILX Lightwave Customer Support. You may contact us in whatever way is most convenient: Phone .

  • Page 8: Table Of Contents

    Table of Contents Module Instruction Manual Chapter 1 Introduction to the LDC-3916330 Series Dual Laser Diode Current Source Modules Introduction ................................1 Safety Symbols and Terms ..............................1 Product Overview ................................2 Initial Inspection................................2 Installing your LDC-3916330 Series Laser Diode Controller Module................2 LDC-3916330 Series Controller Module Specifications ....................4...
  • Page 10 CHAPTER 1 INTRODUCTION TO THE LDC-3916330 SERIES DUAL LASER DIODE CURRENT SOURCE MODULES INTRODUCTION SAFETY SYMBOLS AND TERMS PRODUCT OVERVIEW INITIAL INSPECTION INSTALLING YOUR LDC-3916330 SERIES LASER DIODE CONTROLLER MODULE Installation into LDC-3916 Laser Diode Controller Mainframe General Shipping Instructions...

  • Page 12: Introduction

    SOURCE MODULES INTRODUCTION This chapter is an introduction to the LDC-3916330 Series Dual Laser Diode Current Source Modules for the LDC- 3916 LD Controller Mainframe. Contained in Chapter 1 is unpacking information, instructions on how to install and apply power, and safety considerations and instructions. It also contains some maintenance information, and specifications.

  • Page 13: Product Overview

    INITIAL INSPECTION When you receive your LDC-3916330 Series Module, verify that the shipping kit with 9-pin D-sub connectors and hoods was included in the shipment. INSTALLING YOUR LDC-3916330 SERIES LASER DIODE CONTROLLER MODULE...
  • Page 14 Attach a tag to the module identifying the owner and indicating the service or repair needed. Include the model number and serial number. We suggest that you insure the shipment. See your LDC-3916 Mainframe manual for instructions on where to ship the module. INTRODUCTION TO THE LDC-3916330 SERIES DUAL CURRENT SOURCE MODULES CHPT 1 PAGE...
  • Page 15 Maximum output current transient resulting from normal operational situations (e.g., power on-off, current on-off), as well as accidental situations (e.g., power line plug removal). Maximum output current transient resulting from a 1000V power-line transient spike. Tested to ILX Lightwave Technical Standard #LDC-00196. Request ILX Application Note #3.
  • Page 16 CHAPTER 2 HOW TO OPERATE YOUR LDC-3916330 SERIES DUAL LASER DIODE CURRENT SOURCE MODULE INTRODUCTION CONNECTING TO THE LASER CURRENT SOURCE Interlock Connections Four-Wire Voltage Sense Photodiode Connections Grounding considerations OPERATING THE LASER CURRENT SOURCE FROM THE FRONT PANEL OPERATING A LASER IN CONSTANT CURRENT MODE...

  • Page 18: Introduction

    CURRENT SOURCE MODULE INTRODUCTION This chapter introduces you to the operation of the LDC-3916330 Series Dual LD Current Source's control functions. It offers instructions for connecting your lasers to the current sources. This chapter also contains step by step procedures that teach you how to operate your module in Constant Current Mode or Constant Power Mode. We recommend that you review the contents of this chapter at a minimum before operating your new LDC-3916 16- channel Laser Diode Controller.

  • Page 19: Connecting To The Laser Current Source

    LASER outputs off. It is also recommended that the connections to the LDC-3916330 Series module output be made using twisted wire pairs with an earth-grounded shield (see Figures 2.1 A - D). We recommend using our CC-303 Shielded Laser Cable which is a unique twisted-pair cable with braided outer shield designed to provide the best possible rejection of most transient noise signals.
  • Page 20 LAS2. There are connections provided for laser cathode and anode, photodiode cathode and anode, chassis ground, interlock, and laser forward voltage. The pinout diagram for these connectors is shown in Figure 2.2. HOW TO OPERATE YOUR LDC-3916330 SERIES DUAL CURRENT SOURCE MODULE CHPT 2 PAGE...

  • Page 21: Interlock Connections

    Four-Wire Voltage Sense The LDC-3916330 Series Modules have a 4-wire voltage sense feature. The laser voltage is sensed through a pair of connections (pins 4 and 8) that is separate from the laser current drive connections (pins 5 and 9). This allows a more accurate laser voltage reading for the voltage limit feature.

  • Page 22: Operating The Laser Current Source From The Front Panel

    OPERATING A LASER IN CONSTANT CURRENT MODE Suppose you have an LDC-3916330 Series Module and you want to run the instrument in Constant Current low bandwidth mode (Ilbw), with a set point of 150 mA, a current limit of 175 mA, and a voltage limit of 6 volts. The Ilbw mode uses a low-pass filter on the laser drive current output to significantly reduce noise.

  • Page 23: Selecting The Mode Of Control

    (Constant Current or Constant Power). CAUTION Failure to set and ensure a proper Ilim value could result in laser damage. HOW TO OPERATE YOUR LDC-3916330 SERIES DUAL CURRENT SOURCE MODULE CHPT 2 PAGE...

  • Page 24: Setting The Constant Current Value

    The Bias parameter setting controls whether a 5-volt reverse voltage is supplied to the monitor photodiode or not. Set the Bias parameter to ON or OFF as desired. HOW TO OPERATE YOUR LDC-3916330 SERIES DUAL CURRENT SOURCE MODULE CHPT 2 PAGE...

  • Page 25: Operating A Laser In Constant Power Mode

    OPERATING A LASER IN CONSTANT POWER MODE Suppose you want to operate a 3 mW laser in constant optical power at 1 mW. The LDC-3916330 Series Dual Current Source Modules allow you to operate the instrument current source drivers in Constant Optical Power (P) mode. In the “P”...

  • Page 26: Selecting The Mode Of Control

    Vlim value. The Vlim value should be set slightly above the operating voltage of the laser diode to provide maximum protection. HOW TO OPERATE YOUR LDC-3916330 SERIES DUAL CURRENT SOURCE MODULE CHPT 2 PAGE...

  • Page 27: Setting The Power Limit

    • Measure the corresponding monitor photodiode current. • Calculate the responsivity (CalPD) by dividing the photodiode current by the optical power noting the units required are µA/mW. HOW TO OPERATE YOUR LDC-3916330 SERIES DUAL CURRENT SOURCE MODULE CHPT 2 PAGE...

  • Page 28: Setting The Photodiode Bias Voltage

    ( Plim) value high or set CalPD to zero which will disable the power limit feature. Be sure to set the Ilim and Vlim values on LAS1 p.1 of the laser setup menu to protect your laser. HOW TO OPERATE YOUR LDC-3916330 SERIES DUAL CURRENT SOURCE MODULE CHPT 2 PAGE...

  • Page 29: Conditions Which Will Automatically Shut Off The Laser Output

    LASER output is active. The LDC-3916330 Series Modules’ response to sensing the various limits can be controlled via the GPIB interface. Most high limit responses can be set to either turn off the source or just give a limit warning through the GPIB interface.
  • Page 30 Table 2.3 LASER Error Indicators The E4## error codes indicate errors for the LAS1 current source, and the E5## error codes indicate errors for the LAS2 current source. HOW TO OPERATE YOUR LDC-3916330 SERIES DUAL CURRENT SOURCE MODULE CHPT 2 PAGE...
  • Page 32 CHAPTER 3 OPERATING IN REMOTE CONTROL INTRODUCTION REMOTE CONFIGURATION LDC-3916330 SERIES DUAL LASER DIODE CURRENT SOURCE COMMAND SET LDC-3916330 Series Dual Laser Diode Current Source Often Used Commands Command Timing and Completion STATUS REPORTING Status Registers Output Off Registers Error Messages...

  • Page 34: Chapter 3 Operating In Remote Control

    LDC-3916330 Series modules in conjunction with the LDC-3916. Note: The LDC-3916330 Series modules are dual current sources. Commands to control a parameter in one of the current sources are the same as commands for the other source; they are differentiated by the use of the "LASER1" or "LASER2"...
  • Page 35 : S Y N C L D V ? :SYNCMDI? : S Y N C M D P :TOL : T O L ? Figure 3.1 LDC-3916330 Series Dual Laser Diode Current Source Command Path Structure OPERATING IN REMOTE CONTROL CHPT 3 PAGE 2...

  • Page 36: Ldc-3916330 Series Dual Laser Diode Current Source Often Used Commands

    LDC-3916330 Series Dual Laser Diode Current Source Often Used Commands The complete command set of the LDC-3916330 Series Dual Laser Diode Current Source module contains over 100 commands that allow you to operate the module for a variety of applications. Within the command set, however, is a smaller subset of commands that will meet most of your needs;...

  • Page 37: Status Reporting

    Status Registers The LDC-3916330 Series modules provide status registers which are summarized in the LDC-3916 mainframe. These summaries are accessed via the “ALLCOND?” and “ALLEVE?” remote queries. Refer to the LDC-3916 Instruction Manual for details on remote status reporting.
  • Page 38 LASER1 Condition Status Register LASER1:COND? 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 bit-wise LOGICAL OR LOGICAL AND 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 LASER1 Condition Status Enable Register LASER1 :ENABle:COND <nrf>...
  • Page 39 LASER1 Event Status Register LASER1:EVEnt? 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 bit-wise LOGICAL OR LOGICAL AND 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 LASER1 Event Status Enable Register LASER1:ENABle:EVEnt <nrf>...

  • Page 40: Output Off Registers

    LDC-3916330 Output Off Registers, for Laser 1 and Laser 2. The default (factory) settings for the Output Off registers for LDC-3916330 Series modules are shown in Table 3.2. These settings are not affected by the *PSC (Power-On Status Clear) command.

  • Page 41: Error Messages

    Error Messages This section contains descriptions of the errors which are specific to the LDC-3916330 Series modules. These are the error codes which are returned via the “MODERR?” query. Refer to the LDC-3916 Instruction Manual, Chapter 3, for a list of LDC-3916 mainframe error codes and descriptions (the codes returned via the “ERR?” query).
  • Page 42 LDC-3916330 ERROR MESSAGES, continued Error Code Explanation E-401 Interlock Open forces Laser 1 output off. E-403 Laser 1 Voltage Limit forces output off. “Open Circuit” error. E-404 Laser 1 Current Limit forces output off. E-405 Laser 1 Voltage Limit forces output off. E-407 Laser 1 Monitor Diode Power Limit forces output off.
  • Page 44 CHAPTER 4 COMMAND REFERENCE INTRODUCTION LDC-3916330 SERIES DEVICE-DEPENDENT COMMANDS LDC-3916330 SERIES DEVICE-COMMAND REFERENCE COMMAND REFERENCE FOR YOUR LDC-3916330 SERIES MODULE CHPT 4...

  • Page 46: Introduction

    COMMAND REFERENCE INTRODUCTION This chapter is a guide to all of the device-dependent commands for the LDC-3916330 Series Dual Laser Diode Current Source Modules. This chapter is divided into two parts. The first part contains an overview of the remote commands used by the LDC-3916330 Series.
  • Page 47 Sets line n of the status menu to display photodiode current. STATMENU:LINEn:PPD NONE Sets line n of the status menu to display optical power. Table 4.1 LDC-3916330 Series Device-Dependent Commands (Cont.) COMMAND REFERENCE FOR YOUR LDC-3916330 SERIES MODULE CHPT 4 PAGE...

  • Page 48: Ldc-3916330 Series Device-Dependent Commands

    LDC-3916330 SERIES DEVICE-DEPENDENT COMMANDS This section contains all of the device-dependent commands for the LDC-3916330 Series Dual Laser Current Source Modules, listed in alphabetical order. Sub-sections for each path are presented, listing the commands which are legal for that path. See Chapter 3 Figure 3.1 for command path tree structure.

  • Page 49: Ldc-3916330 Series Device-Command Reference

    LDC-3916330 SERIES DEVICE-COMMAND REFERENCE The following pages contain a reference for the device-dependent commands of the LDC-3916330 Series Dual Laser Current Source Modules. It contains useful information for remote operation of the the modules. It contains the commands for only the Laser1 current source. The commands for Laser2 are identical; merely replace “Laser1” with “Laser2”.
  • Page 50 LASER1: n Front Panel n Remote The LASER1: command path is used to access the LDC-3916330 Series Dual Laser Diode Current Source's Laser1 current source commands. The following command paths may be reached from the LASER1: command path. LASER1:CAL: LASER1:ENABle:...
  • Page 51 None. The response is an <nrf value>. POINTS OF INTEREST Photodiode bias is turned off when a *RST command is issued. EXAMPLES "Laser1:BIAS?" -response: 0, means that the selected module's Laser1 photodiode bias is off. COMMAND REFERENCE FOR YOUR LDC-3916330 SERIES MODULE CHPT 4 PAGE...
  • Page 52 "LASER1:CALPD 0" -action: sets the CAL PD parameter to 0. "Laser1:Calpd 10.0" -action: sets the CAL PD parameter to 10 microamp/milliwatt. A photodiode µA feedback current will cause measured optical power 1 mW. COMMAND REFERENCE FOR YOUR LDC-3916330 SERIES MODULE CHPT 4 PAGE...
  • Page 53 The LASER1:CAL: command path is used to access the selected module's Laser1 calibration commands. The following commands may be reached directly from the LASER1:CAL: command path. LASER1:CAL:ABORT LASER1:CAL:DEFAULT LASER1:CAL:LDI LASER1:CAL:LDV LASER1:CAL:MDI LASER1:CAL:MEAS LASER1:CAL:STATUS? LASER1:CAL:VALUE? COMMAND REFERENCE FOR YOUR LDC-3916330 SERIES MODULE CHPT 4 PAGE...
  • Page 54 POINTS OF INTEREST If this command is issued while the LDC-3916330 Series Dual Laser Diode Current Source is in a Laser1 calibration, the calibration will be terminated and the module will operate with the same calibration values as before the calibration mode was started.
  • Page 55 PARAMETERS None. POINTS OF INTEREST See the Service Reference portion of this manual for complete calibration instructions. EXAMPLES "Laser1:CAL:Ldv" -action: the selected module enters calibration mode for Laser1 voltage measurement. COMMAND REFERENCE FOR YOUR LDC-3916330 SERIES MODULE CHPT 4 PAGE...
  • Page 56 POINTS OF INTEREST See the Service Reference portion of this manual for complete calibration instructions. EXAMPLES "Laser1:CAL:MEAS 4.95" -action: the module uses the value 4.95 for the required measurement value. COMMAND REFERENCE FOR YOUR LDC-3916330 SERIES MODULE CHPT 4 PAGE...
  • Page 57 "LAser1:Cal:Stat?" -response: 0, means the module is not yet ready for the LASER1 calibration measurement value to be entered. LASER1:CAL:VALUE? ¨Front Panel n Remote The LASER1:CAL:VALUE? query is used at the factory only. COMMAND REFERENCE FOR YOUR LDC-3916330 SERIES MODULE CHPT 4 PAGE...
  • Page 58 Limit (2), and it is in Current Limit (1). "LA SER1:COND?" -response: 272, means that the Laser1 Output is shorted (turned off - 256) and its Interlock pins are not connected (16). COMMAND REFERENCE FOR YOUR LDC-3916330 SERIES MODULE CHPT 4 PAGE...
  • Page 59 "laser1:step 1.0; laser1:dec 10,1000" -action: the step size is set to 1.0 mA, the setpoint is decremented by 1.0 mA, 10 times, with 1 second between decrement steps. The Laser1 output is decremented a total of 10 mA over a period of 10 seconds. COMMAND REFERENCE FOR YOUR LDC-3916330 SERIES MODULE CHPT 4 PAGE...
  • Page 60 EXAMPLES "LASER1:ENAB:COND 9" -action: the only conditions from the selected module that will be reported to the 3916 Status Byte are the Power Limit (8) and Current Limit (1) conditions. COMMAND REFERENCE FOR YOUR LDC-3916330 SERIES MODULE CHPT 4 PAGE...
  • Page 61 "LASER1:ENAB:COND?" -response: 258, means that only the following two conditions will be reported (in summarized form) to the 3916's Status Byte: Output Shorted (256) and Voltage Limit (2). Note that the "Output Shorted" condition is the same as "Output Off". COMMAND REFERENCE FOR YOUR LDC-3916330 SERIES MODULE CHPT 4 PAGE...
  • Page 62 EXAMPLES "LASER1:ENAB:EVENT 136" -action: only the "Open Circuit Changed State" (128) and "Power Limit Changed State" (8) events will be reported (in summarized form) to the 3916's Status Byte. COMMAND REFERENCE FOR YOUR LDC-3916330 SERIES MODULE CHPT 4 PAGE...
  • Page 63 EXAMPLES "LASER1:ENAB:EVE?" - r esponse: 256, means that the selected module's Laser1 "Output Shorted Changed State" event is the only event that will be reported to the 3916 Status Byte. COMMAND REFERENCE FOR YOUR LDC-3916330 SERIES MODULE CHPT 4 PAGE...
  • Page 64 NOTE Open Circuit or Interlock Open conditions will always turn off the current source. They are not included in the Output Off Enable Register because they cannot be disabled. COMMAND REFERENCE FOR YOUR LDC-3916330 SERIES MODULE CHPT 4 PAGE...
  • Page 65 Laser1 output status can be monitored by the LASER1:EVEnt? query. EXAMPLES "LASER1:ENAB:OUTOFF?" - r esponse: 8, means that the selected module's Power Limit condition will cause the selected module's Laser1 output to be turned off. COMMAND REFERENCE FOR YOUR LDC-3916330 SERIES MODULE CHPT 4 PAGE...
  • Page 66 "LASER1:EVE?" -response: 131, means that an "Open Circuit Changed State" event (128), a "Voltage Limit Changed State" event (2), and a "Current Limit Changed State" event (1) have occurred since the last LASER1:EVEnt? query. COMMAND REFERENCE FOR YOUR LDC-3916330 SERIES MODULE CHPT 4 PAGE...
  • Page 67 The setpoint is read using the LASER1:SET:LDI? query. EXAMPLES "Laser1:LDI 400" -action: sets the selected module's Laser1 output current to 400.00 mA. "LASER1:ldi 100" -action: sets the selected module's Laser1 output current to 100.00 mA. COMMAND REFERENCE FOR YOUR LDC-3916330 SERIES MODULE CHPT 4 PAGE...
  • Page 68 This measurement is updated approximately once every 600 msec. EXAMPLES "LASER1:ldv?" -response: 3.03, means the measured Laser1 output voltage is 3.03 volts. "Laser1:LDV?" -response: 1.0, means the measured Laser1 output voltage is 1.00 volts. COMMAND REFERENCE FOR YOUR LDC-3916330 SERIES MODULE CHPT 4 PAGE...
  • Page 69 The current limit is valid for all modes of operation. EXAMPLES "LASER1:LIM:I?" -response: 40, means the selected module's Laser1 current limit is 40 mA. "Laser1:LIM:I?" -response: 300, means the selected module's Laser1 current limit is 300 mA. COMMAND REFERENCE FOR YOUR LDC-3916330 SERIES MODULE CHPT 4 PAGE...
  • Page 70 None. The response is an <nrf value>. POINTS OF INTEREST The selected module's voltage limit is valid for all modes of operation. EXAMPLES "LASER1:LIM:V?" -response: 4.0, means the selected module's Laser1 voltage limit is 4.0 volts. COMMAND REFERENCE FOR YOUR LDC-3916330 SERIES MODULE CHPT 4 PAGE...
  • Page 71 The LASER1:LIMit:MDP? query returns the value of the selected module's Laser1 optical power limit setpoint. SYNTAX DIAGRAM LASER1 PARAMETERS None. The response is an <nrf value>. EXAMPLES "LASER1:LIM:MDP?" -response: 300.0, means the selected module's monitor PD power limit is set to 300.0 mW. COMMAND REFERENCE FOR YOUR LDC-3916330 SERIES MODULE CHPT 4 PAGE...
  • Page 72 INTEREST This measurement is updated approximately once every 600 msec. "Laser1:MDi?" -response: 57.3, means 57.3 µA of photodetector current was measured in the EXAMPLES selected module's Laser1 monitor photodiode circuit. COMMAND REFERENCE FOR YOUR LDC-3916330 SERIES MODULE CHPT 4 PAGE...
  • Page 73 MDI by CalPD. If CalPD is 0, this query returns a -1.0. This measurement is updated approximately once every 600 msec. EXAMPLES "Laser1:MDp?" -response: 100.0, means Laser1's optical power is calculated to be 100 mW. COMMAND REFERENCE FOR YOUR LDC-3916330 SERIES MODULE CHPT 4 PAGE...
  • Page 74 The LASER1:MODE: command path is used to access the selected module's Laser1 mode selection commands. The following commands may be reached directly from the LASER1:MODE: command path. LASER1:MODE:IHBW LASER1:MODE:ILBW LASER1:MODE:MDI LASER1:MODE:MDP COMMAND REFERENCE FOR YOUR LDC-3916330 SERIES MODULE CHPT 4 PAGE...
  • Page 75 Constant ILBW mode (low bandwidth) enables the selected module's output low bandpass filter. EXAMPLES "Laser1:mode:ilbw" -action: enables the low bandwidth constant current mode for the selected module's Laser1 current source. COMMAND REFERENCE FOR YOUR LDC-3916330 SERIES MODULE CHPT 4 PAGE...
  • Page 76 CALPD conversion factor. Therefore, in this mode the set point is only as accurate as the user’s CALPD value. EXAMPLES "LASER1:MODE:MDP" -action: sets the selected module's Laser1 operating mode to constant optical power mode. COMMAND REFERENCE FOR YOUR LDC-3916330 SERIES MODULE CHPT 4 PAGE...
  • Page 77 "LASER1:MOD?" -response: 1, means that the selected module's Laser1 modulation switch is enabled. A signal applied to the back panel modulation connector will modulate the selected module's Laser1 current. COMMAND REFERENCE FOR YOUR LDC-3916330 SERIES MODULE CHPT 4 PAGE...
  • Page 78 - r esponse: 0, means that the selected module's Laser1 output switch is disabled; devices may be safely disconnected or connected at the selected module's Laser1 output terminal. "LASER1:OUT?" - response: 1, means that the selected module's Laser1 output switch is enabled. COMMAND REFERENCE FOR YOUR LDC-3916330 SERIES MODULE CHPT 4 PAGE...
  • Page 79 The LDI set point is only in effect when the operating mode is IHBW or ILBW. EXAMPLES "LA SER1:SET:LDI?" -response: 50.0, means the selected module's Laser output current set point value is 50.0 mA. COMMAND REFERENCE FOR YOUR LDC-3916330 SERIES MODULE CHPT 4 PAGE...
  • Page 80 POINTS OF INTEREST This set point is used in constant MDP (P) mode only. EXAMPLES "LASER1:Set:MDP?" -response: 10.0, means the selected module's Laser1 monitor PD feedback set point is 10.0 mW. COMMAND REFERENCE FOR YOUR LDC-3916330 SERIES MODULE CHPT 4 PAGE...
  • Page 81 None. The response is an <nrf value> of the selected module's step amount. POINTS OF INTEREST The step of 1 corresponds to 1.0 mA. EXAMPLES "Laser1:Step?" -response: 1.0 means the selected module's Laser1 step size is 1.0 mA. COMMAND REFERENCE FOR YOUR LDC-3916330 SERIES MODULE CHPT 4 PAGE...
  • Page 82 In contrast, the laser:ldi? query returns immediately, but the measurement can be up to 600 msec old. EXAMPLES "LASER1:syncldi?" -response: 54.1, means the measured laser current is 54.1 mA. COMMAND REFERENCE FOR YOUR LDC-3916330 SERIES MODULE CHPT 4 PAGE...
  • Page 83 In contrast, the laser:ldv? query returns immediately, but the measurement can be up to 600 msec old. EXAMPLES "LASER1:syncldv?" -response: 3.03, means the measured laser output voltage is 3.03 volts. COMMAND REFERENCE FOR YOUR LDC-3916330 SERIES MODULE CHPT 4 PAGE...
  • Page 84 In contrast, the laser:mdi? query returns immediately, but the measurement can be up to 600 msec old. "LASER1:syncmdi?" -response: 145.5, means the measured photodiode current is 145.5 µA. EXAMPLES COMMAND REFERENCE FOR YOUR LDC-3916330 SERIES MODULE CHPT 4 PAGE...
  • Page 85 In contrast, the laser:mdp? query returns immediately, but the measurement can be up to 600 msec old. EXAMPLES "LASER1:syncmdp?" -response: 5.5, means the calculated optical power is 5.5 mW. COMMAND REFERENCE FOR YOUR LDC-3916330 SERIES MODULE CHPT 4 PAGE...
  • Page 86 “STATMENU:LINE1?” -response: “PPD”, means that optical power from laser 1 is selected to be displayed on line 1. “STATMENU:LINE2?” -response: “PPD”, means that optical power from laser 2 is selected to be displayed on line 2. COMMAND REFERENCE FOR YOUR LDC-3916330 SERIES MODULE CHPT 4 PAGE...
  • Page 87 “STATMENU:LINE1:LDI” -response: laser diode current of laser 1 is displayed on line 1 of the status menu. “STATMENU:LINE2:LDI” -response: laser diode current of laser 2 is displayed on line 2 of the status menu. COMMAND REFERENCE FOR YOUR LDC-3916330 SERIES MODULE CHPT 4 PAGE...
  • Page 88 “STATMENU:LINE1:VF” -response: laser diode forward voltage of laser 1 is displayed on line 1 of the status menu. “STATMENU:LINE2:VF” -response: laser diode forward voltage of laser 2 is displayed on line 2 of the status menu. COMMAND REFERENCE FOR YOUR LDC-3916330 SERIES MODULE CHPT 4 PAGE...
  • Page 90 CHAPTER 5 CALIBRATION AND TROUBLESHOOTING GUIDE INTRODUCTION CALIBRATION OVERVIEW Recommended Equipment LOCAL CALIBRATION OF THE LASER CURRENT SOURCE Current Source Calibration IPD Current Calibration Laser Forward Voltage Measurement Calibration REMOTE CALIBRATION OF THE 3916330 DUAL CURRENT SOURCE MODULE Laser Current Source Calibration LDI Calibration IPD Current Calibration Laser Forward Voltage Measurement Calibration...

  • Page 92: Chapter 5 Calibration And Troubleshooting Guide

    CHAPTER 5 CALIBRATION AND TROUBLESHOOTING GUIDE INTRODUCTION This chapter describes calibration of your 3916330 Series Dual Laser Diode Current Source Module. Descriptions of the required test instruments, calibration conditions, and the detailed procedures for calibration of the instrument’s Laser Diode Current Sources are included. A troubleshooting guide is also offered for some of the more common failure symptoms.
  • Page 93 It will be necessary to connect various loads and circuits to the outputs of the module for the calibration procedure. The devices required for most of the calibration loads are listed in Table 5.2. A schematic is shown in Figure 5.1 for the photodiode calibration circuit, with the required components listed in Table 5.3.

  • Page 94: Local Calibration Of The Laser Current Source

    LOCAL CALIBRATION OF THE LASER CURRENT SOURCE There are three calibration adjustments for each current source (LAS1 and LAS2) of the 3916330 Series Dual Current Source Module. They are: calibration of the constant current (LDI) source, calibration of the constant light power (I PD ) feedback circuit, and calibration of the laser forward voltage (LDV) measurement.

  • Page 95: Ipd Current Calibration

    g. Measure the actual current, and enter that value into the IREAL adjust field. After you have entered the second value, the internal cal procedure calibrates the LD current measurement circuit, the LD current source for both low and high bandwidths, and the LD current limit circuit. IPD Current Calibration The following procedure is for calibrating the LASER I PD (photodiode monitor) measurement circuits.

  • Page 96: Laser Forward Voltage Measurement Calibration

    Laser Forward Voltage Measurement Calibration The following procedure is for calibrating the LASER forward voltage (LDV) measurement circuits. The internal calibration procedure sets the current to two values. You must enter the resulting forward voltage that you measure at both of these points. The internal procedure will then use this information to calibrate the LDV measurement circuit.

  • Page 97: Remote Calibration Of The 3916330 Dual Current Source Module

    REMOTE CALIBRATION OF THE 3916330 DUAL CURRENT SOURCE MODULE The 3916330 Modules can be calibrated remotely via the GPIB Interface. All of the required calibration commands are listed in Table 4.1 in Chapter 4. The procedures below are general guidelines for writing a program to calibrate your instrument.
  • Page 98 Enter the Laser Current Source calibration mode by sending the following command over GPIB: LASER1:CAL:LDI LASER2:CAL:LDI The internal cal procedure will begin by setting the Laser output current to approximately 25% of its full range. Allow the current to settle for at least 10 seconds. If this calibration value is to be measured and entered remotely via a GPIB controlled DMM, for example, the actual value of the current should not be entered until the cal procedure is ready to receive it.

  • Page 99: Ipd Current Calibration

    IPD Current Calibration The following procedure is for remotely calibrating the LASER I PD (photodiode monitor) measurement circuits. The module’s internal calibration procedure sets the current to two values. You must enter the resulting I PD (photodiode monitor) current that you measure at both of these points. The module’s internal cal procedure will then use this information to calibrate the I PD measurement circuit.

  • Page 100: Laser Forward Voltage Measurement Calibration

    Laser Forward Voltage Measurement Calibration The following procedure is for remotely calibrating the laser forward voltage measurement circuit. The module’s internal calibration procedure sets the current to two values. You must measure and enter the forward voltage at both of these points. The module’s internal cal procedure will then use this information to calibrate the voltage measurement system.

  • Page 101: Troubleshooting Guide

    TROUBLESHOOTING GUIDE This section is a guide to troubleshooting the 3916330 Series Dual Current Source Modules. Some of the more common symptoms are listed here, and the appropriate troubleshooting actions are given. We recommend that the user start at the beginning of this guide. Read the symptom descriptions, and follow the steps for the corrective actions which apply.
  • Page 102 Output goes off intermittently Check the interlock circuit. An intermittent interlock will turn the output off. Check that the AC power cord connection is secure. Power-line drop-outs may reset the unit and when power is restored, the output will be off. Unable to adjust output Make sure that the ISET adjust parameter is highlighted.

This manual is also suitable for:

Ldc-3916332Ldc-3916334

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