ILX Lightwave LDC-3916371 User manual

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User’s Guide
High TEC Resolution
Laser Diode Controller Module
LDC-3916371
ILX Lightwave Corporation P. O.Box 6310 Bozeman, MT, U.S.A. 59771 :· · · 1-800-459-9459 · ·
www.ilxlightwave.com
U.S. & Canada International Inquiries: 406-586-1244 Fax [phone]
E-mail: [email protected]
70028603_7/01
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Safety and Warranty Information
! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !
S AFETY AND W ARRANTY I NFORMATION
The Safety and Warranty Information section provides details about cautionary symbols used in the
manual, safety markings used on the instrument, and information about the Warranty including
Customer Service contact information.
Safety Information and the Manual
Throughout this manual, you will see the words Caution and Warning indicating potentially
dangerous or hazardous situations which, if not avoided, could result in death, serious or minor
injury, or damage to the product. Specifically:
!
CAUTION
Caution indicates a potentially hazardous situation which can result in minor or
moderate injury or damage to the product or equipment.
WARNING
Warning indicates a potentially dangerous situation which can result in serious injury or
death.
WARNING
Visible and/or invisible laser radiation. Avoid direct exposure to the beam.
General Safety Considerations
If any of the following conditions exist, or are even suspected, do not use the instrument until safe
operation can be verified by trained service personnel:
•Visible damage
•Severe transport stress
•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.
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Safety and Warranty Information
S AFETY S YMBOLS
This section describes the safety symbols and classifications.
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.
•Class I Equipment (grounded type)
•Mains supply voltage fluctuations are not to exceed ±10% of the nominal supply voltage.
•Pollution Degree II
•Installation (overvoltage) Category II for transient overvoltages
•Maximum Relative Humidity: <80% RH, non−condensing
•Operating temperature range of 0 °C to 40 °C
•Storage and transportation temperature of ˘40 °C to 70 °C
•Maximum altitude: 3000 m (9843 ft)
•This equipment is suitable for continuous operation.
Safety Marking Symbols
This section provides a description of the safety marking symbols that appear on the instrument.
These symbols provide information about potentially dangerous situations which can result in death,
injury, or damage to the instrument and other components.
Caution,
refer to
manual
Earth
ground
Terminal
Alternating
current
Visible and/or
invisible laser
radiation
Caution, risk
of electric
shock
Protective
Conductor
Terminal
Caution, hot
surface
Frame or
chassis
Terminal
On: In position of a bistable push control. The
slash (I) only denotes that mains are on.
Off: Out position of a bistable push control.
The circle (O) only denotes that mains are off.
or
(I) or
(O)
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Safety and Warranty Information
W ARRANTY
ILX LIGHTWAVE CORPORATION warrants this instrument to be free from defects in material and
workmanship for a period of one year from date of shipment. During the warranty period, ILX will
repair or replace the unit, at our option, without charge.
Limitations
This warranty does not apply to fuses, lamps, defects caused by abuse, modifications, or to use of
the product for which it was not intended.
This warranty is in lieu of all other warranties, expressed or implied, including any implied warranty
of merchantability or fitness for any particular purpose. ILX Lightwave Corporation shall not be liable
for any incidental, special, or consequential damages.
If a problem occurs, please contact ILX Lightwave Corporation with the instrument’s serial number,
and thoroughly describe the nature of the problem.
Returning an Instrument
If an instrument is to be shipped to ILX Lightwave for repair or service, be sure to:
1Obtain a Return Authorization number (RA) from ILX Customer Service.
2Attach a tag to the instrument identifying the owner and indicating the required service or
repair. Include the instrument serial number from the rear panel of the instrument.
3Attach the anti−static protective caps that were shipped with the instrument and place the
instrument in a protective anti−static bag.
4Place the instrument in the original packing container with at least 3 inches (7. 5 cm) of
compressible packaging material. Shipping damage is not covered by this warranty.
5Secure the packing box with fiber reinforced strapping tape or metal bands.
6Send the instrument, transportation pre−paid, to ILX Lightwave. Clearly write the return
authorization number on the outside of the box and on the shipping paperwork. ILX
Lightwave recommends you insure the shipment.
If the original shipping container is not available, place your instrument in a container with at least 3
inches (7.5 cm) of compressible packaging material on all sides.
Repairs are made and the instrument returned transportation pre−paid. Repairs are warranted for the
remainder of the original warranty or for 90 days, whichever is greater.
Claims for Shipping Damage
When you receive the instrument, inspect it immediately for any damage or shortages on the
packing list. If the instrument is damaged, file a claim with the carrier. The factory will supply you
with a quotation for estimated costs of repair. You must negotiate and settle with the carrier for the
amount of damage.
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Safety and Warranty Information
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . (800) 459−9459 or (406) 586−1244
Fax . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (406) 586−9405
Email. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [e-mail]
Or mail to:
ILX Lightwave Corporation
P. O. Box 6310
Bozeman, Montana, U.S.A 59771
www.ilxlightwave.com
When you contact us, please have the following information:
If ILX Lightwave determines that a return to the factory is necessary, you are issued a Return
Authorization (RA) number. Please mark this number on the outside of the shipping box.
You or your shipping service are responsible for any shipping damage when returning the
instrument to ILX Lightwave; ILX recommends you insure the shipment. If the original shipping
container is not available, place your instrument in a container with at least 3 inches (7.5cm) of
compressible packaging material on all sides.
We look forward to serving you even better in the future!
Model Number:
Serial Number:
End−user Name:
Company:
Phone:
Fax:
Description or sketch of what
is connected to the ILX
Lightwave instrument:
Description of the problem:
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Table of Contents
Module Instruction Manual
Chapter 1 Introduction to the LDC-3916371 Controller Module
Introduction ...............................................................................................................................................................1
Safety Symbols and Terms..............................................................................................................................................1
Product Overview............................................................................................................................................................2
Initial Inspection..............................................................................................................................................................2
Installing your LDC-3916371 Laser Diode Controller Module......................................................................................2
LDC-3916371 Controller Module Specifications............................................................................................................4
Chapter 2 How to Operate Your LDC-3916371 Controller Module
Introduction ...............................................................................................................................................................1
Connecting to the Laser Controller..................................................................................................................................2
Connecting to the TEC Controller...................................................................................................................................5
Operating the Laser Current Source from the Front Panel..............................................................................................6
Operating a Laser in Constant Current (I) Mode............................................................................................................6
Operating a Laser in Constant Power (P) Mode.............................................................................................................9
Conditions which will Automatically Shut Off the Laser Output ................................................................................13
Operating the TEC Controller from the Front Panel.....................................................................................................15
Operating the Controller in Constant Temperature (T) Mode......................................................................................15
Understanding DAC Mode……………………………………………………………………………………………18
TEC Error Indicators.....................................................................................................................................................21
Chapter 3 Operating in Remote Control
Introduction ...............................................................................................................................................................1
Remote Configuration......................................................................................................................................................1
LDC-3916371 Laser Diode Controller Command Set.....................................................................................................1
Status Reporting..............................................................................................................................................................4
Chapter 4 Command Reference
Introduction ...............................................................................................................................................................1
LDC-3916371 Device-Dependent Commands................................................................................................................4
LDC-3916371 Device-Command Reference....................................................................................................................4
Commands listed in Alphabetical Order..........................................................................................................................6
Chapter 5 Calibration and Troubleshooting Guide
Introduction ...............................................................................................................................................................1
Calibration Overview.......................................................................................................................................................1
Local Calibration of the Temperature Controller.............................................................................................................3
Local Calibration of the Laser Current Source.................................................................................................................5
Remote Calibration of the 3916371 Controller................................................................................................................8
Troubleshooting Guide..................................................................................................................................................18
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INTRODUCTION TO THE LDC-3916371 CONTROLLER MODULE CHPT 1
CHAPTER 1 1
INTRODUCTION TO THE LDC-3916371 CONTROLLER MODULE 1
INTRODUCTION 1
SAFETY SYMBOLS AND TERMS 1
PRODUCT OVERVIEW 2
INITIAL INSPECTION 2
INSTALLING YOUR LDC-3916371 LASER DIODE CONTROLLER MODULE 2
Installation into LDC-3916 Laser Diode Controller Mainframe 2
General Shipping Instructions 3
LDC-3916371 LASER DIODE CONTROLLER MODULE SPECIFICATIONS 4
Laser Current Source Specifications 4
Temperature Control (TEC) Specifications 5
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INTRODUCTION TO THE LDC-3916371 CONTROLLER MODULE CHPT 1
PAGE 1
CHAPTER 1
INTRODUCTION TO THE LDC-3916371 CONTROLLER MODULE
INTRODUCTION
This chapter is an introduction to the LDC-3916371 Laser Diode Controller Module for the LDC-3916 LD Controller
Mainframe containing unpacking information, instructions on how to install and apply power, and safety
considerations and instructions. It also contains some maintenance information, and specifications.
WARNING
If any of the following symptoms exist, or are even suspected, remove the LDC-3916371
Controller Module from service. Do not use the LDC-3916371 module until safe operation can
be verified by trained service personnel.
1. Visible damage
2. Severe transport stress
3. Prolonged storage under adverse conditions
4. Failure to perform intended measurements or functions
If necessary, return the LDC-3916371 module to ILX Lightwave for service and repair to ensure
that safety features are maintained.
SAFETY SYMBOLS AND TERMS
The following safety terms are used in this manual:
•The WARNING heading explains dangers that could result in personal injury or death.
•The CAUTION heading explains hazards that could damage your instrument.
•The NOTES heading gives information to the user that may be beneficial in the use of the instrument and to the
devices being tested.
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INTRODUCTION TO THE LDC-3916371 CONTROLLER MODULE CHPT 1
PAGE 2
The following symbols are used in this manual and on the instrument:
Earth Ground and/or Protective Conductor Terminal
Caution: Refer to accompanying documents
Caution: Risk of Electrical Shock
Instrument Power Off
Instrument Power On
PRODUCT OVERVIEW
The LDC-3916371 Laser Diode Controller Module is a combination laser current source and temperature controller.
This module is targeted for DWDM signal source DFB lasers and has higher temperature resolution for fine tuning
the wavelength of the laser. The built-in bi-polar temperature controller can work with thermistor type temperature
sensors and most TEC modules to deliver precise laser temperature control. Other features of the TEC control circuit
include TEC voltage measurement and control loop gain adjustment from 1 to 127. The laser current source provides
high stability output of up to 500 mA with fully redundant current limits and multiple laser protection features such as
contact bounce detection, voltage limit adjust, and 4-wire voltage measurement for precise laser voltage
measurement.
INITIAL INSPECTION
When you receive your LDC-3916371 Controller Module, inspect it for any shipping damage. A shipping kit should
be included which contains 9-pin and 15-pin D-sub connectors with hoods plus this Instruction Manual.
INSTALLING YOUR LDC-3916371 LASER DIODE CONTROLLER MODULE
Installation into LDC-3916 Laser Diode Controller Mainframe
If you are receiving this new module for installation into a previously purchased LDC-3916 mainframe, follow the
instructions below. If your mainframe system was configured at the factory with your desired modules, use this
section for reference when moving modules.
Turn off the mainframe power switch before inserting or removing any modules. Damage from "hot swapping" the
modules is not covered under the warranty.
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INTRODUCTION TO THE LDC-3916371 CONTROLLER MODULE CHPT 1
PAGE 3
CAUTION
Static discharge can damage your new Laser Diode Controller Module. Be certain you use
proper grounding procedures before you unpack and install your controller module(s) into the
LDC-3916 Mainframe.
Inspect the module for any visible shipping damage that may have occurred before inserting the
module into the mainframe. Pay special attention to the copper shielding material on the back
edge of the module.
Be sure that the LDC-3916 Mainframe power is off before inserting your new laser diode
controller module. Damage from "hot swapping" is not included under the warranty.
Unwrap the module from the anti-static bag it was packaged in.
Insert the module into the desired slot from the rear of the LDC-3916 Mainframe. Each module is supported by two
plastic card guides inside of the mainframe. Insert the module, 40 pin connector first, by lining up the edges of the
module frame with the appropriate card guides (one on top and one on the bottom). Carefully slide the module into
the mainframe slot until the connector is seated. You will have to push a little harder to seat the module. The rear
panel of the module should be flush with the mainframe when properly inserted. Fasten the module to the mainframe
with two screws located at the top and bottom of the module rear panel.
General Shipping Instructions
If you need to ship your LDC-3916371 Laser Diode Controller Module back to the factory for repair, be sure that the
module is packaged in an anti-static bag and an enclosure with cushioning material to prevent damage to the module
during shipment (use the original shipping containers and accessories if possible). Re-install the ESD protective
caps on the rear panel over the connectors (9-pin and 15-pin D). Shipping damage is not covered under warranty.
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 the
warranty and instructions on where to ship the module.
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INTRODUCTION TO THE LDC-3916371 CONTROLLER MODULE CHPT 1
PAGE 4
LDC-3916371 LASER DIODE CONTROLLER MODULE SPECIFICATIONS
Laser Current Source Specifications
MODEL NUMBER: 3916371
DRIVE CURRENT OUTPUT1
Output Current Range: 0 to 500 mA
Set-Point Resolution: 10 µA
Set-Point Accuracy: ±0.1% of full scale
Compliance Voltage: 6 V (adjustable voltage limit)
Temperature Coefficient: ≤50ppm/°C
Short Term Stability (1 hr.):2≤20 ppm
Long Term Stability (24 hr.):3≤50 ppm
Noise and Ripple:4
High Bandwidth Mode: < 10µA rms
Low Bandwidth Mode: < 5µA rms
Transients:
Operational: 5< 3 mA
1kV EFT / Surge:6< 4 mA / < 8 mA
DRIVE CURRENT LIMIT SETTINGS
Range: 0 to 500 mA
Resolution 0.2 mA
Accuracy: ± .70mA
PHOTODIODE FEEDBACK
Type: Differential 10ΩInput,
Selectable Zero Bias or 5V Reverse Bias
PD Current Range: 0 to 5,000µA
Output Stability:7±0.01%
Accuracy, set point (% of FS): ± 0.1%
EXTERNAL ANALOG MODULATION
Input :80 to 10V, 50Ω
Transfer Function: 50 mA / V
High Bandwidth Mode, Small Signal Bandwidth:9DC to 1.2 MHz
High Bandwidth Mode, Large Signal Bandwidth:10 DC to 1.0 MHz
Low Bandwidth Mode: DC to 30KHz
DRIVE CURRENT MEASUREMENT
(DISPLAY)
Output Current Range: 0 to 500.00 mA
Output Current Resolution: 0.01 mA
Output Current Accuracy (@25°C): ± 0.05% of Full Scale
Photodiode Current Range: 0 to 5,000µA
PD Current Resolution: 0.1 µA
PD Current Accuracy (@25°C): ± 2µA
PD Responsivity Range:11 0.00 to 1000.00µA/ mW
PD Responsivity Resolution: 0.01 µA/ mW
Optical Power Range: 0.00 to 500.00 mW
Optical Power Resolution: 100 µW
Forward Voltage Range: 0.00 to 7.5 V
Forward Voltage Resolution: 10 mV
Forward Voltage Accuracy:12 ± 2 mV
1. All values relate to a one-hour warm-up period.
2. Over any 1-hour period, half-scale output.
3. Over any 24-hour period, half-scale output.
4. Measured optically, evaluating noise intensity of a laser diode into a photodetector with 150kHz Bandwidth.
5. 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).
6. Maximum output current transient resulting from a 1000V power-line transient spike.
7. Maximum monitor photodiode current drift over any30 minute period. Assumes zero drift inresponsivity of photodiode.
8. Modulation input is 50Ωterminated inside the mainframe.
9. 250 mA set point, 50 mA modulation current, 1Ωload. High bandwidth mode.
10. 50% modulation at mid-scale output, 1Ωload. High bandwidth mode.
11. Responsivity value is user-defined and is used to calculate the optical power.
12. Four wire voltage measurement. Voltage measurement accuracy while driving calibration load. Accuracy is dependent upon load and cable used.
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INTRODUCTION TO THE LDC-3916371 CONTROLLER MODULE CHPT 1
PAGE 5
Temperature Control (TEC) Specifications
TEMPERATURE CONTROL1
Temperature Control Range:2-5 °C to 50°C
Thermistor Setpoint
Resolution: 0.01 °C
Accuracy:3± 0.2 °C
Short Term Stability (1 hr.):4< ±0.007 °C
Long Term Stability (24 hrs.):5< ±0.01 °C
Output Type: Bipolar, current source
Compliance Voltage: > 7 V DC
Short Circuit Output Current: 1.5 Amps
Maximum Output Power: 9 Watts
Current Noise and Ripple:6< 1 mA rms
Current Limit Range: 0.1 to 1.5 Amps
Current Limit Set Accuracy: ±0.05 Amps
Control Algorithm: Smart Integrator, Hybrid PI
Gain adjustable from 1 to 127
TEMPERATURE SENSOR
Types: Thermistor (2-wire NTC)
Thermistor Sensing Current: 100
µ
A
Useable Thermistor Range: 3,500 to 45,000Ω, typical
User Calibration: Steinhart-Hart, 3 constants
TEC MEASUREMENT (DISPLAY)
Temperature
Range:7-99.9 °C to +199.9°C
Accuracy:3±0.5 °C
Thermistor Resistance
Range: 3,500 to 45,000Ω
Accuracy: ±0.005 kΩ
TE Current
Range: -1.50 to +1.50 Amps
Accuracy: ±0.04 Amps
Current Resolution: ±0.01 Amps
Voltage
Range: -9.999 to +9.999 V
Resolution: 100 mV (1 mV through GPIB)
Accuracy:8±70 mV
TEMPERATURE CONTROL NOTES
1. All values relate to a one-hour warm-up period.
2. Software limits of range. Actual range possible depends on the physical load, thermistor type, and TEC module used.
3. Accuracy figures are quoted for a typical 10 kΩthermistor and 100
µ
A current setting. Accuracy figures are relative to the calibration standard. Both
resolution and accuracy are dependent upon the user-defined configuration of the instrument.
4. Over any 1-hour period, half-scale output, controlling an LDM-4412 mount @ 25°C, with10 kΩthermistor, on 100
µ
A setting.
5. Over any 24-hour period, half-scale output, controlling an LDM-4412 mount @ 25°C, with10 kΩthermistor, on 100
µ
A setting.
6. Measured at 1 Amp output over a bandwidth of 10 Hz - 10MHz.
7. Software limits of display range.
8. Voltage measurement accuracy while driving calibration load. Accuracy is dependent upon load used.
In keeping with our commitment to continuing improvement, ILX Lightwave reserves the right to change
specifications without notice or liability for such changes.
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HOW TO OPERATE YOUR LDC-3916371 CONTROLLER MODULE CHPT 2
CHAPTER 2 1
HOW TO OPERATE YOUR LDC-3916371 CONTROLLER MODULE 1
INTRODUCTION 1
CONNECTING TO THE LASER CONTROLLER 2
Interlock Connections 4
Photodiode Connections 4
Grounding Considerations 4
CONNECTING TO THE TEC CONTROLLER 5
TEC Grounding Considerations 5
OPERATING THE LASER CURRENT SOURCE FROM THE FRONT PANEL 6
OPERATING A LASER IN CONSTANT CURRENT (I) MODE 6
Entering the Laser Channel Setup Menu 6
Selecting the Mode of Control 7
Setting the Current Limit 7
Setting the Constant Current Value 7
Setting the Voltage Limit 8
Enabling the Modulation Input 8
Setting Photodiode BIAS Voltage 8
Turning the Laser Current Source On 9
OPERATING A LASER IN CONSTANT POWER (P) MODE 9
Calculating Photodiode Responsivity Values 9
Entering the Laser Channel Setup Menu 9
Selecting the Mode of Control 10
Setting the Current Limit 10
Setting the Voltage Limit 10
Setting the Power Limit 11
Adjusting the Constant Power Setting 11
Setting the Responsivity Value (CalPD) 11
Setting the Photodiode Bias Voltage 12
Enabling the Modulation Input 12
Constant Power Mode If CalPD is Unknown 12
Turning the Laser Current Source On 13
CONDITIONS WHICH WILL AUTOMATICALLY SHUT OFF THE LASER OUTPUT 13
Laser Error Indicators 13
OPERATING THE TEC CONTROLLER FROM THE FRONT PANEL 15
Selecting the TEC Control Setup Menu 15
OPERATING THE CONTROLLER IN CONSTANT TEMPERATURE (T) MODE 15
Selecting the TEC Control Mode 16
Setting the Temperature Limit 16
Adjusting the Temperature Set Point 16
Setting TEC Current Limit 17
Setting TEC Control Loop Gain 17
Setting Temperature Sensor Constants 18
Understanding DAC Mode 18
Operating in DAC Mode 19
Conditions Which Will Automatically Shut Off the TEC Output 20
TEC ERROR INDICATORS 21
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HOW TO OPERATE YOUR LDC-3916371 CONTROLLER MODULE CHPT 2
PAGE 1
CHAPTER 2
HOW TO OPERATE YOUR LDC-3916371 CONTROLLER MODULE
INTRODUCTION
This chapter introduces you to the operation of the LDC-3916371 LD Controllers’ laser drive and TEC control
functions. It offers instructions for connecting your laser to the current source and temperature controller. This
chapter also contains step by step procedures that teach you how to operate your controller module in Constant
Current Mode and Constant Power Mode, and to operate the temperature controller in Constant Temperature Mode.
We recommend that you review the contents of this chapter at a minimum before operating your Laser Diode
Controller.
LDC-3916371 CONTROLLER DEFAULT CONFIGURATION
TEC CONTROLLER
TEC output off
TEC Mode = Constant Temperature (T)
Temperature set point (T or Tset) = 22°C
TEC current set point (ITE or Iset) = 1.0 Amp
TEC current limit (LIM:ITE or Ilim) = 1.0 Amps
Temperature limit (LIM:THI or Tlim) = 80.0°C
TEC resistance set point (R or Rset) = 10 kΩ
TEC Tolerance values = 0.2°C, 5 seconds
TEC Gain = 3
TEC SENSOR current fixed at 100µA range
C1 = 1.125 (x 10-3)
C2 = 2.347 (x 10-4)
C3 = 0.855 (x 10-7)
LASER CONTROLLER
LASER output off
LAS current set point (LDI or Iset) = 50mA
LAS current limit (LIM:I or Ilim) = 150mA
LAS voltage limit (LIM:V or Vlim) = 5.0 V
Mode = Constant Current low bandwidth mode (MODE:ILBW or Ilbw)
Modulation off
Optical power set point (MDP or Pset) = 3.0mW
Monitor responsivity (CALPD or CalPD) = 0.0µA/mW
Optical power limit (LIM:MDP or Plim) = 500mW
Monitor PD Bias off
LASER STEP value = 0.1mA
Monitor current set point (MDI or Ipdset) = 100µA
Table 2.1 LDC-3916371 Controller Default Settings
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