LDC
3908
8 Channel Laser
Diode Controller

Specifications

Product Features

GENERAL

3908

3916

Chassis Ground:
GPIB Connector:
RS-232 Connector:
Power Requirements:

4mm Banana Jack
24-pin IEEE-488
9–pin D–sub
50–60Hz; selectable voltage
100V, 120V, 220V, 240V,(+6%, –10%)133mm x 482mm x 389mm
5.25" x 18.98" x 15.3"4mm Banana Jack
24-pin IEEE-4888
9–pin D–sub
50–60Hz; selectable voltage
120V, 220V, 240V,(+6%, –10%)133mm x 482mm x 653mm
5.25" x 18.98" x 25.7"

20 kg (44lbs)
24kg (52lbs)
0°C to 40°C
–40°C to 70°C
20–85%, noncondensing
Keyswitch, Interlock, Output Delay:(Meets 21CFR1040.10)
Vacuum fluorescent, 64 x 128 pixels
83 mm x 41 mm

34.4kg (76lbs)
41kg (91lbs)
0°C to 40°C
–40°C to 70°C
20–85%, noncondensing
Keyswitch, Interlock, Output Delay:(Meets 21CFR1040.10)
Vacuum fluorescent, 64 x 128 pixels
83mm x 41mm

Size (HxWxD):
Weight (typical)
Mainframe Only:
With Modules:
Operating Temperature:
Storage Temperature:
Humidity:1
Laser Safety Features:
Display:

Mainframe

8 independent channels
with up to 16 isolated outputs
Fast GPIB/IEEE-488 interface“Smart” modules for flexibility andspeed

Laser Current SourcesHigh compliance voltage
Direct modulation up to 1.2MHz
Four-wire measurement of laser
diode forward voltage
Advanced laser protection features
including adjustable voltage limit

NOTES
1

Based on the vacuum fluorescent display specification.

The LDC-3908 8-Channel Laser Diode Controller has
all of the same great features as our popular LDC-3916
16-Channel Laser Diode Controller. In fact, modules areinterchangeable between the two instruments. The smaller
size and lighter weight of the LDC-3908 make it an ideal
instrument for smaller channel count applications such as
R&D or production test of EDFAs and Raman amplifiers.
Handles on the front panel and flip-up feet on thebottom facilitate bench-top use, while flanges facilitate
installation into standard 19 inch instrument racks. “Smart”
modules include controller modules with up to 1.5A oflaser current source and 9W of TEC control, dual current
source modules with two isolated currents of up to 1A, adual 9W TEC module, a 3A laser current module, and a
3A 24W TEC module.

TEC Controllers

LabVIEW® is a registered trademark of National Instruments.

TEC voltage measurement

This product has passed all CE requirements and bears the CE mark.
In keeping with our commitment to continuous improvement, ILX Lightwave reserves the right to change specifications without notice and without
liability for such changes.

Resistive heater control adapters
available

ORDERING INFORMATION
LDC-3908
LDC-3916
LDC-3916371
LDC-3916372
LDC-3916374
LDC-3916376
LDC-3916332
LDC-3916334
LDC-3916338
LDC-3916550
LDC-3916558
RM-137
RM-1388-Channel Laser Diode Controller
Mainframe
16-Channel Laser Diode
Controller MainframeHigh TEC Resolution
500mA/9W Controller Module
500mA/9W Controller Module
1A/9W Controller Module
1.5A/9W Controller Module
500mA/ 500mA Dual Current
Source Module
1A /1A Dual Current Source
Module3A Current Source Module
9W/9W Dual Temperature (TEC)
Controller Module
3A (24W) Temperature (TEC)
Controller Module
Rack Mount Kit, 20.5" holespacing
Rack Mount Kit, 25" hole spacing

CC-305S

Current Source/Laser Diode Mount
Interconnect Cable
CC-306S
Current Source/UnterminatedInterconnect Cable
CC-316M
Laser Current Cables (bundle of 8)
CC-501STE Controller/UnterminatedInterconnect Cable
CC-505STE Controller/Laser Diode Mount
Interconnect Cable
CC-516M
TE Controller Cables (bundle of 8)
LNF-320
Low Noise Filter
LDM-4616
16-Channel Laser Diode Mount
LDM-4604/xBFY Butterfly Module for LDM-4616 Mount
LDM-4604/xDFB DFB Butterfly Module for LDM-4616 Mount
LDM-4604/xDIL
DIL Module for LDM-4616 Mount
UCA-350
Unipolar Heater Control Adapter
LabVIEW® Instrument Driver

8 Channels of Laser Diode Control
For information call
1-800-459-9459

P.O. Box 6310, Bozeman, MT 59771 • FAX: 406-586-9405

www.ilxlightwave.com

International Inquiries: 406-556-2481
email: sales@ilxlightwave.com
REV02.062705

LDC
3908
8 Channel Laser
Diode Controller

LDC
3908
8 Channel Laser
Diode Controller

Specifications

Dual Current Source Modules*
Front Panel Interface
Provides Simple Operation
The front-panel interface features a brightvacuum fluorescent display, making theinformation readable from almost any angle. You
can easily monitor the operations of up to fourchannels at a time. Simple and intuitive menus,
supported by screen-specific soft-keys, allow you
to quickly configure and operate each channel.
Menu depths have been intentionally limited tokeep the front-panel operation concise, whilemore sophisticated operations are reserved for
the GPIB interface. Setpoints and other values
can be entered through your choice of numeric
keypad entry, up-down arrow keys, or a rotary
adjustment knob.

Powerful GPIB Interface Offers
Robust, Automated Control
A powerful processor platform drives the LDC3908 8 Channel Laser Diode Controller. Whencoupled with GPIB technology from National
Instruments’ HS488 TNT chipset, you get all theprocessing capability needed for mission-criticalproduction testing. With microprocessors oneach module, the mainframe engine manages
8 independent control channels quickly andreliably. Free LabVIEW® instrument drivers areavailable upon request or by downloading themfrom www.ilxlightwave.com.

High Performance Modules
Support Future System Expansion
Designed to provide the cleanest, safest
power available for laser diode control, each
module’s control functions are handled locallyand communicated quickly to the host processor.
On-board intelligence simplifies future additionof modules since all operational and calibration
data is stored in the module. Simply plug in yournew module and power up the system. Your

3916332

CURRENTSOURCE
mainframe never needs to leave the rack. This
simplicity, coupled with low noise, high stability
outputs, and state-of-the-art laser diode protection
equals ultimate performance.

State-of-the-Art Current Source
Design Brings New Levelsof PerformanceThis new current source topology uses aninnovative, proprietary control loop and incorporates the latest techniques for signal filtering andcircuit board shielding. These advancements
provide unbeatable stability and unparallelednoise performance, ideal for the most demanding
production test applications. This design also
incorporates adjustable compliance voltage andfaster shutoff, helping prevent dangerous “reconnect” transients that can occur from intermittent
connections between the controller and yourlaser diode. This new level of protection adds toour proven list of protection features: independent
current limits, output shorting circuits, and a slow
start turn-on feature.

Dual 500mA

LASER CURRENT OUTPUT
Output Current Range:
Setpoint
Resolution:
Accuracy:
Compliance Voltage:

0–500mA

3916334

Dual 1A

0–1000mA

10µA
20µA
0.1% of FS
0.1% of FS
6V
6V(adjustable voltage limit)
Temperature Coefficient:<50ppm/°C<50ppm/°C<20ppmShort-Term Stability (one-hour):2 <20ppm
3<50ppmLong-Term Stability (24-hours): <50ppm
Noise and Ripple4
High Bandwidth:<10µA rms
<12µA rms
Low Bandwidth:<5µA rms<8µA rms
Transients
5
<3mA
<3mA
Operational:
1kV EFT:
<4mA
<5mA
6
<8mA
<10mA
Surge:LASER DRIVE LIMIT SETTINGS
Current Limit
Range:
Resolution:
Accuracy:
Voltage Limit
Range:
Resolution:

0–500mA
0.2mA±0.7mA

0–1000mA
0.4mA±1.4mA

0–7.5V
0.1V

0–7.5V
0.1V

PHOTODIODE FEEDBACK

Differential 10Ω
Input.
Selectable Zero
Bias or 5V
Reverse Bias
0–5000µA
0.01%±0.1% of FS

Type:Photodiode Current Range:
Output Stability:7
Setpoint Accuracy:

0–10V, 50W
50mA/V

0–10V, 50W
100mA/V

New Capabilities from theFlexible Current Source You Trust
Operational modes including constant current,
constant current high-bandwidth, or constant
optical power are selectable from the front panel
or via the GPIB interface. Measurement of yourlaser diode’s forward voltage is possible with 4-wireaccuracy, which can be helpful in production environments where longer cable runs are common. A
single, rear-panel modulation port can individuallyenable direct modulation of each channel’s laser
current. This new current source design supports
modulation bandwidths of up to 1.2MHz (small
signal), achieving the highest direct modulationlevels available today. Modules also include
reverse photodiode bias capabilities, especially
important for telecom wavelength devices.

TEC Modules

TEMPERATURE 3916550
Dual 9W
CONTROLTEMPERATURE SENSOR
Types:

7

Thermistor Sensing Current:
Usable Thermistor Range:
User Calibration:

Thermistor(2-wire NTC)
10µA/100µA
25–450,000Ω, typical
Steinhart-Hart,
3 constants

Dual1ADC to 1.2MHz
DC to 1.0MHz
DC to 30kHz

DC to 1.0MHz
DC to 1.0MHz
DC to 30kHz

LASER CURRENT
MEASUREMENT (DISPLAY)
Output Current
Range:
Resolution:
Accuracy (at 25°C):
Photodiode Current
Range:
Resolution:
Accuracy (at 25°C):
Photodiode Responsivity
Range:11
Resolution:
Optical Power
Range:
Resolution:
Forward Voltage
Range:
Forward Voltage
Resolution:12
Accuracy:13

0–500.0mA
0.01mA±0.05% of FS

0–1000.0mA
0.01mA±0.05% of FS

0–5000µA
0.1µA
±2µA

0–5000µA
0.1µA
±2µA

0.00–1000.00µA/mW 0.00–1000.00µA/mW
0.01µA/mW
0.01µA/mW
0.0– 5000.00mW
100µW

0.0– 5000.00mW
100µW

0.00– 7.5V

0.0– 7.5V

10mV
±7mV

10mV
±7mV

*Two isolated laser sources in each module.
1 All values after a one-hour warm-up period.
2 Over any one-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. powerline plug removal).
6 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.
7 Maximum monitor photodiode current drift over any 30-minute period. Assumes zero drift in
responsivity of photodiode.
8 Modulation input is 50Ω terminated inside the mainframe.
9 250mA setpoint, 50mA modulation current, 1Ω load.
10 50% modulation at mid-scale output, 1Ω load, high bandwidth mode.
11 Responsivity value is user-defined and is used to calculate the optical power.
12 1mV through GPIB.
13 Four-wire voltage measurement while driving calibration load. Specifications valid for values
above 10mV. Accuracy is ±2mV through GPIB.

3916558

3916550

Dual 9W

Single 24W (3A)

TEMPERATURE CONTROL OUTPUT

Temperature Control Range:2 –99.9°C to 150°C
Temperature Setpoint
Resolution Accuracy3
Resolution and Accuracy:–20°C to 20°C:
0.1°C±0.2°C
20°C–50°C:
0.2°C±0.2°C
Short-Term Stability (one-hour):4 <±0.007°C
Long-Term Stability (24-hours):5 <±0.01°C
Output Type:
Bipolar current source
Compliance Voltage:>6V DC
Maximum Output Current:
1.5A
Maximum Output Power:
9W
Current Noise and Ripple:<1mA rms6
Current Limit
Range:
0.1–1.6A
Set Accuracy:±0.05A
Control Algorithm:
Smart Integrator,
Hybrid PI Gain adjustable from 1–127

High Bandwidth Mode
Small Signal Bandwidth:9Large Signal Bandwidth:10
Low Bandwidth Mode:

3916334

Dual 500mA

DUAL CURRENT SOURCE NOTES
Differential 10Ω
Input.
Selectable Zero
Bias or 5V
Reverse Bias
0–5000µA
0.01%±0.1% of FS

EXTERNAL ANALOG MODULATION
Input:8
Transfer Function:

3916332–99.9°C to 150°C

Resolution Accuracy3
0.1°C±0.2°C
0.2°C±0.2°C<±0.007°C<±0.01°C
Bipolar current source>8V DC
3A
24W<2mA rms12
0.1–3.10A±0.05A
Smart Integrator,
Hybrid PI Gain adjustable from 1–127
Thermistor(2-wire NTC)
10µA/100µA
25–450,000Ω, typical
Steinhart-Hart,
3 constants

3916558

Single 24W (3A)

TEC MEASUREMENT (DISPLAY)
Temperature
Range:8
Accuracy:
Thermistor Resistance
10 µA Setting
Range:
Accuracy:
100 µA Setting
Range:
Accuracy:
TEC Current
Range:
Accuracy:
Voltage
Range:
Resolution:
Accuracy:11

NOTES–99.9°C to 199.9°C±0.5°C–99.9°C to 199.9°C±0.5°C

0.01–450.00kΩ±0.05kΩ9

0.01–450.00kΩ±0.05kΩ90.001–45.000kΩ±0.005kΩ100.001–45.000kΩ±0.005kΩ10–1.50 to 1.50A±0.04A–3.00 to 3.00A±0.04A–9.999 to 9.999V
100mV (1 mV in GPIB)±70mV (±20mV
in GPIB)–10.75 to 10.75V
100mV (1mV in GPIB)±70mV(±20mV
in GPIB)

See Current Source Notes and Temperature Control Notes under Controller Modules
Specifications.

LDC
3908
8 Channel Laser
Diode Controller

LDC
3908
8 Channel Laser
Diode Controller

LDC
3908

Specifications
Controller Modules (Laser and TE Control)continued
TEMPERATURECONTROL139163723916374

500mA/9W

1A/9W

3916376
1.5A/9W

OUTPUT

Temperature Control Range:2
Temperature Setpoint
Resolution and Accuracy:–20°C to 20°C:
20°C–50°C:
Short-Term Stability (one-hour):4
Long-Term Stability (24 hours):5
Output Type:
Compliance Voltage:
Short Circuit Output Current:
Maximum Output Power:
Current Noise and Ripple:6
Current Limit
Range:
Set Accuracy:
Control Algorithm:–99°C to 150°C
Resolution Accuracy
0.1°C±0.2°C
0.2°C±0.2°C<±0.007°C<±0.01°C
Bipolar current source>7V DC
1.5A
9W<1mA rms–99°C to 150°C
3Resolution Accuracy
0.1°C±0.2°C
0.2°C±0.2°C<±0.007°C<±0.01°C
Bipolar current source>7V DC
1.5A
9W<1mA rms–99°C to 150°C
3Resolution
Accuracy3
0.1°C±0.2°C
0.2°C±0.2°C<±0.007°C<±0.01°C
Bipolar current source>7V DC
1.5A
9W<1mA rms

0–1.5A±0.05A
Smart Integrator,
Hybrid PI
Gain adjustablefrom 1–127

0–1.5A±0.05A
Smart Integrator,
Hybrid PI
Gain adjustablefrom 1–127

0–1.5A±0.05A
Smart Integrator,
Hybrid PI
Gain adjustablefrom 1–127

Thermistor (2-wire NTC)
10/100µA
25–450,000Ω, typical
Steinhart-Hart, 3 constants

Thermistor (2-wire NTC)
10/100µA
25–450,000Ω, typical
Steinhart-Hart, 3 constants

Thermistor (2-wire NTC)
10/100µA
25–450,000Ω, typical
Steinhart-Hart, 3 constants–99.9°C to 199.9°C±0.5°C–99.9°C to 199.9°C±0.5°C–99.9°C to 199.9°C±0.5°C

0.01–450.00kΩ±0.05kΩ0.01–450.00kΩ±0.05kΩ0.01–450.00kΩ±0.05kΩ0.001–45.000kΩ±0.005kΩ

0.001–45.000kΩ±0.005 kΩ

0.001–45.000kΩ±0.005kΩ–1.50 to 1.50A±0.04A±0.01A–1.50 to 1.50A±0.04A±0.01A–1.50 to 1.50A±0.04A±0.01A–9.999 to 9.999V
100mV (1mV in GPIB)±70mV (±20mV in GPIB)–9.999 to 9.999V
100mV (1mV in GPIB)±70mV (±20mV in GPIB)–9.999 to 9.999V
100mV (1mV in GPIB)±70mV (±20mV in GPIB)

8 Channel Laser
Diode Controller

TEMPERATURE SENSOR
Types:
Thermistor Sensing Current:7
Usable Thermistor Range:
User Calibration:

TEC MEASUREMENT (DISPLAY)
Temperature:
Range:8
Accuracy:
Thermistor Resistance
10µA Setting
Range:
Accuracy:9
100µA Setting
Range:
Accuracy:10
TEC Current
Range:
Accuracy:
Current Resolution:
Voltage
Range:
Resolution:
Accuracy:11

TEMPERATURE CONTROL NOTES
1
2

When coupled with the LDM-4616 Modular Laser Diode Mount,the LDC-3916 Multi-Channel Controllers provide a configurable,
cost-effective solution for multi-channel DWDM signal sources. The
mount can also support many popular 980nm and 1480nm pumplaser diodes for EDFA test applications.

All values relate to a one-hour warm-up period.
Software limits of range. Actual range possible depends on thephysical load, thermistor type, and TEC module used.
3 Accuracy figures are quoted for a typical 10kΩ thermistor and100µA current setting for –5°C to 50°C and typical 100kΩ
thermistor and 10µA current setting for –20°C to –5°C. Accuracy figures are relative to the calibration standard. Bothresolution and accuracy are dependent upon the user-defined
configuration of the instrument.
4 Over any one-hour period, half-scale output, controlling an
LDM-4412 mount at 25°C with 10kΩ thermistor on 100µA setting.
5 Over any 24-hour period, half-scale output, controlling an LDM4412 Mount at 25°C with 10kΩ thermistor on 100µA setting.
6 Measured at 1A output over a bandwidth of 10Hz to 10MHz.
7 Thermistor current range software selectable by front panel or
GPIB.
8 Software limits of display range.
9 Using a 10kΩ thermistor, controlling an LDM-4412 mount over
–30°C to 65°C (~200–2kΩ) or a 100kΩ thermistor controllingan LDM-4412 mount over 10°C–85°C (~200–10kΩ).
10 Using a 10kΩ thermistor, controlling an LDM-4412 mount over
–5°C to 90°C (~45–1kΩ).
11 Voltage measurement accuracy while driving calibration load.
Accuracy is dependent upon load used.
12 Measured at 2A output over a bandwidth of DC to 25MHz.

High-Stability TEC Control
Keeps Your Device Temperature
in Check
Equipped with a smart integrator control loop
and an expanded gain setting range, the temperature control circuits optimize settling times.
These modules also provide voltage measurement of your TEC and allow internal selectionof thermistor current ranges via front-panel or
GPIB. Achieve unparalleled temperature stabilities with ultra-stable design topology and low
noise bipolar output stages.

Flexible Control Over a
Wide Range of Applications
By combining true modularity with highchannel density, the LDC-3908 easily grows
with your applications. When coupled with our
16-channel mounting tray, this controller also
serves as a cost effective DWDM optical source
set. Simply mount your choice of WDM DFB
laser diodes in the mounting tray, connect tothe controller, and you’ll have full control over
8 WDM signal sources at a time. If your specified test wavelengths change, simply drop in

new DFB laser diodes. For even higher channel
counts, add another controller and mounting tray
to your rack. If your device drive specifications
change, look to ILX Lightwave for new modules
that can be easily added to your system in the
future.

Protect Your Investment with theLeader in Laser Diode Protection
The LDC-3908 8 Channel Controller
provides all of ILX Lightwave’s proven laser
protection features like independent current
limits, slow-start turn-on circuits, and isolated
power supplies.* The adjustable compliancevoltage capability brings even greater levelsof protection to your devices. Designed
for time-critical production test needs, theLDC-3908 will satisfy your test requirements with
fast, reliable, and secure laser diode control.
* Semiconductor lasers are sensitive devices. Always take appropriate
antistatic precautions and use extreme care when handling laser diodes. For
more information, request ILX Application Note #3, “Protecting Your
Laser Diode.”

LDC
3908
8 Channel Laser
Diode Controller

Specifications

Specifications

Fine Temperature Resolution Controller Module

Controller Modules (Laser and TE Control)

1

CURRENT SOURCE1

3916371
500mA/9W
0–500mA
10µA±0.1% of FS>6V (adjustable voltage limit)<50ppm/°C<20ppm<50ppm<10µA rms
<5µA rms
<3mA
<4mA
<8mA

LASER DRIVE LIMIT SETTINGS
Current Limit
Range:
Resolution:
Accuracy:
Voltage Limit
Range:
Resolution:

Photodiode Current Range:
Output Stability:7
Setpoint Accuracy:

LASER CURRENT OUTPUT

0.01°C±0.2°C<±0.007°C<±0.01°C
Bipolar current source>7V DC
1.5A
9W<1mA rms

Output Current Range:
Setpoint
Resolution:
Accuracy:
Compliance Voltage:
Temperature Coefficient:
Short-Term Stability (one-hour):2
Long-Term Stability (24-hour):3
Noise and Ripple4
High Bandwidth:
Low Bandwidth:
Transients
Operational:5
1kV EFT:
Surge:6

0–1.5A±0.05A
Smart Integrator, Hybrid PI,
Gain adjustable from 1–127

TEMPERATURE SENSOR

0–7.5V
0.1V

TEC MEASUREMENT (DISPLAY)

Differential 10Ω Input.
Selectable Zero Biasor 5 V Reverse Bias
0–5000µA
0.01%±0.1% of FS
0–10V, 50Ω
50mA/VDC to 1.2MHz
DC to 1.0MHz
DC to 30kHz

LASER CURRENT MEASUREMENT (DISPLAY)
Output Current
Range:
Resolution:
Accuracy (at 25°C):
Photodiode Current
Range:
Resolution:
Accuracy:
Photodiode Responsivity
Range:11
Resolution:
Optical Power
Range:
Resolution:
Forward Voltage
Range:
Resolution:
Accuracy:12-5°C to 50°C

Types:
Thermistor Sensing Current:
Usable Thermistor Range:
User Calibration:

EXTERNAL ANALOG MODULATION
Input:8
Transfer Function:
High Bandwidth Mode
Small Signal Bandwidth:9Large Signal Bandwidth:10
Low Bandwidth Mode:

Temperature Control Range:2
Thermistor Setpoint
Resolution:
Accuracy:3
Short-Term Stability (1 hr.):4
Long-Term Stability (24 hrs.):5
Output Type:
Compliance Voltage:
Maximum Output Current:
Maximum Output Power:
Current Noise and Ripple:6
Current Limit
Range:
Set Accuracy:
Control Algorithm:

0–500mA
0.2mA±0.7mAPHOTODIODE FEEDBACKType:

CURRENT SOURCE1

391637239163743916376

500mA/9W

1A/9W

1.5A/9W

0–500mA

0–1000mA

0–1500mA

10µA±0.1% of FS
6V (adjustable voltage limit)<50ppm/°C<20ppm<50ppm20µA±0.1% of FS
6V (adjustable voltage limit)<50ppm/°C<20ppm<50ppm40µA±0.1% of FS
4.75V (adjustable voltage limit)<50ppm/°C<20ppm<50ppm<10µA rms
<5µA rms<10µA rms
<5µA rms<12µA rms
<8µA rms

<3mA
<4mA
<8mA

<3mA
<5mA
<10mA

<3mA
<5mA
<10mA

0–500mA
0.2mA±0.7mA

0–1000mA
0.4mA±1.4mA

0–1500mA
0.6mA±4.5mA

0–7.5V
0.1V±0.2V

0–7.5V
0.1V±0.2V

0–7.5V
0.1V±0.2V

TEMPERATURE CONTROL OUTPUTLASER CURRENT OUTPUT
Output Current Range:
Setpoint
Resolution:
Accuracy:
Compliance Voltage:
Temperature Coefficient:
Short-Term Stability (one-hour):2
Long-Term Stability (24 hours):3
Noise and Ripple4
High bandwidth:
Low bandwidth:
Transients
Operational:5
1kV EFT:
Surge:63916371
TEMPERATURE CONTROL1 500mA/9W

LDC
3908

0–500.00mA
0.01mA±0.05% of FS
0–5000µA
0.1µA±2µA (at 25°C)
0.00–1000.00µA/mW
0.01µA/mW
0.00–5000.0mW
100µW
0.00–7.5V
10mV
±7mV

Temperature
Range:7
Accuracy:3
Thermistor ResistanceRange:
Accuracy:
TEC Current
Range:
Accuracy:
Voltage
Range:
Resolution:
Accuracy:8

Thermistor (2-wire NTC)
100µA
5100–13,000Ω, typical
Steinhart-Hart, 3 constants–99.9°C to 199.9°C±0.5°C
5100–13,000Ω±5Ω–1.50 to 1.50A±0.04A–9.999 to 9.999V
100mV (1mV in GPIB)±70mV (±20mV in GPIB)NOTES
The 3916371 Laser Current Source specifications are the same as the 3916372
Controller Module specifications.
Current Source Notes and Temperature Control Notes are on the following pages.

LASER DRIVE LIMIT SETTINGS
Current Limit
Range:
Resolution:
Accuracy:
Voltage Limit
Range:
Resolution:
Accuracy:

PHOTODIODE FEEDBACKType:
Photodiode Current Range:
Output Stability:7
Setpoint Accuracy:

Differential 10Ω Input, Selectable Zero Bias or 5V Reverse Bias on all modules
0–5000µA
0–5000µA
0–5000µA±0.01%±0.01%±0.01%±0.1% of FS±0.1% of FS±0.1% of FS

EXTERNAL ANALOG MODULATION
Input:8
Transfer Function:
High Bandwidth Mode
Small Signal Bandwidth:9Large Signal Bandwidth:10
Low Bandwidth Mode:

0–10V, 50Ω
50mA/ V

0–10V, 50Ω
100mA/ V

0–7.5V, 50Ω
200mA/ V

DC to 1.2 MHz
DC to 1.0MHz
DC to 30kHz

DC to 1.0MHz
DC to 1.0MHz
DC to 30kHz

DC to 0.9MHz
DC to 0.9MHz
DC to 30kHz

0–500.00mA
0.01mA±0.05% of FS

0–1000.0mA
0.01mA±0.05% of FS

0–1500.0mA
0.03mA±0.07% of FS

0–5000µA
0.1µA
±2µA

0–5000µA
0.1µA
±2µA

0–5000µA
0.1µA
±2µA

0.0–1000.00µA/mW
0.01µA/mW

0.0–1000.00µA/mW
0.01µA/mW

0.0–1000.00µA/mW
0.01µA/mW

0.0–5000.00mW
100µW

0.0–5000.00mW
100µW

0.0–5000.00mW
100µW

0.00–7.5V
10mV (1mV through GPIB)±7mV (±2mV through GPIB)

0.00–7.5V
10mV (1mV through GPIB)±7mV (±2mV through GPIB)

0.00–5V
10mV (1mV through GPIB)±7mV (±2mV through GPIB)LASER CURRENT MEASUREMENT (DISPLAY)
Output Current
Range:
Resolution:
Accuracy (@25°C):
Photodiode Current
Range:
Resolution:
Accuracy (@25°C):
Photodiode Responsivity
Range:11
Resolution:
Optical Power
Range:
Resolution:
Forward Voltage
Range:
Resolution:
Accuracy:12

CURRENT SOURCE NOTES
1
2
3
4
5

6

All values relate to a one-hour warm-up period.
Over any one-hour period, half-scale output.
Over any 24-hour period, half-scale output.
Measured optically, evaluating noise intensity of a laser diode into a photodetector with
150kHz bandwidth.
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.

7

Maximum monitor photodiode current drift over any 30-minute period. Assumes
zero drift in responsivity of photodiode.
8 Modulation input is 50Ω terminated inside the mainframe.
9 250mA setpoint, 50mA modulation current, 1Ω load.
10 50% modulation at mid-scale output, 1Ω load.
11 Responsivity value is user-defined and is used to calculate the optical power.
12 Four-wire voltage measurement while driving calibration load. Specification valid forvalues above 10mV.

8 Channel Laser
Diode Controller

Specifications1
3 Amp Current Source Module
CURRENT SOURCE 3916338
Single 3A
LASER CURRENT OUTPUT
Output Current Range:
Setpoint
Resolution:
Accuracy:2
Compliance Voltage:
Temperature Coefficient:
Short-Term Stability (one-hour):3
Long-Term Stability (24-hour):4
Noise and Ripple5
High bandwidth:
Low bandwidth:
Transients
Operational:6
1kV EFT/Surge:70–3000mA
80µA±0.1% of FS
4.5V (adjustable voltage limit)<100ppm/°C<50ppm<75ppm<36µA rms
<24µA rms
<5mA
<5mA/<10 mA

LASER DRIVE LIMIT SETTINGS
Current Limit
Range:
Resolution:
Accuracy:
Voltage Limit
Range:
Resolution:
Accuracy:

0–3000mA
1.025mA±9mA
0–7.5V
0.2V±0.2V

PHOTODIODE FEEDBACKType:

Photodiode Current Range:
Output Stability:8
Accuracy, Setpoint:

Differential 10Ω
Input. Selectable
Zero Bias or 5V
Reverse Bias
0–5000µA±0.01%±0.1% of FS

EXTERNAL ANALOG MODULATION
Input:9Transfer Function:
High Bandwidth Mode
Small Signal Bandwidth:10
Large Signal Bandwidth:11
Low Bandwidth Mode:

0–8.0V, 50Ω
375mA/V ±10%
DC to 0.6MHz
DC to 0.6MHz
DC to 30kHz

LASER CURRENT MEASUREMENT(DISPLAY)
Output Current
Range:
Resolution:
Accuracy (at 25°C):
Photodiode Current
Range:
Resolution:
Accuracy (at 25°C):
Photodiode Responsivity
Range:12
Resolution:
Optical Power
Range:
Resolution:
Forward Voltage
Range:
Resolution:
Accuracy:13

0–3000.0mA
0.01mA±0.07% of FS
0–5000µA
0.1µA±2µA
0.00–1000.00µA/mW
0.01µA/mW
0.0–5000.0mW
100µW
0.00–7.5V
10 mV (1mV GPIB)±7mV (±2mV GPIB)

CURRENT SOURCE NOTES
1 All values relate to a one-hour warm-up period.
2 Accuracy is 0.15% above 2.5A after one-hour warm-up period.
3 Over any one-hour period, half-scale output.
4 Over any 24-hour period, half-scale output.
5 Measured optically, evaluating noise intensity of a laser diodeinto a photodetector with 150kHz bandwidth.
6 Maximum output current transient resulting from normal
operational situations (e.g. power on-off, current on-off), as wellas accidental situations (e.g. power line plug removal).
7 Maximum output current transient resulting from a 1000V
power-line transient spike. Tested to ILX Lightwave TechnicalStandard #LDC-00196. Request ILX Application Note #3,“Protecting Your Laser Diode”.
8 Maximum monitor photodiode current drift over any 30-minuteperiod. Assumes zero drift in responsivity of photodiode.
9 Modulation input is 50Ω terminated inside the mainframe.
10 250mA setpoint, 50mA modulation current, 1Ω load.
High bandwidth mode.
11 50% modulation at mid-scale output, 1Ω load. High bandwidth
mode.
12 Responsivity value is user-defined and is used to calculate theoptical power.
13 Four-wire voltage measurement while driving calibration load.
Specification valid for values above 10mV.
In keeping with our commitment to continuing improvement, ILX Lightwave
reserves the right to change specifications without notice and without
liability for such changes.

For information call
1-800-459-9459
P.O. Box 6310, Bozeman, MT 59771• FAX: 406-586-9405

www.ilxlightwave.com

International Inquiries: 406-556-2481
email: sales@ilxlightwave.com
REV02.062705

LDC
3908
8 Channel Laser
Diode Controller

LDC
3908
8 Channel Laser
Diode Controller

Specifications

Specifications

Fine Temperature Resolution Controller Module

Controller Modules (Laser and TE Control)

1

CURRENT SOURCE1

3916371
500mA/9W
0–500mA
10µA±0.1% of FS>6V (adjustable voltage limit)<50ppm/°C<20ppm<50ppm<10µA rms
<5µA rms
<3mA
<4mA
<8mA

LASER DRIVE LIMIT SETTINGS
Current Limit
Range:
Resolution:
Accuracy:
Voltage Limit
Range:
Resolution:

Photodiode Current Range:
Output Stability:7
Setpoint Accuracy:

LASER CURRENT OUTPUT

0.01°C±0.2°C<±0.007°C<±0.01°C
Bipolar current source>7V DC
1.5A
9W<1mA rms

Output Current Range:
Setpoint
Resolution:
Accuracy:
Compliance Voltage:
Temperature Coefficient:
Short-Term Stability (one-hour):2
Long-Term Stability (24-hour):3
Noise and Ripple4
High Bandwidth:
Low Bandwidth:
Transients
Operational:5
1kV EFT:
Surge:6

0–1.5A±0.05A
Smart Integrator, Hybrid PI,
Gain adjustable from 1–127

TEMPERATURE SENSOR

0–7.5V
0.1V

TEC MEASUREMENT (DISPLAY)

Differential 10Ω Input.
Selectable Zero Biasor 5 V Reverse Bias
0–5000µA
0.01%±0.1% of FS
0–10V, 50Ω
50mA/VDC to 1.2MHz
DC to 1.0MHz
DC to 30kHz

LASER CURRENT MEASUREMENT (DISPLAY)
Output Current
Range:
Resolution:
Accuracy (at 25°C):
Photodiode Current
Range:
Resolution:
Accuracy:
Photodiode Responsivity
Range:11
Resolution:
Optical Power
Range:
Resolution:
Forward Voltage
Range:
Resolution:
Accuracy:12-5°C to 50°C

Types:
Thermistor Sensing Current:
Usable Thermistor Range:
User Calibration:

EXTERNAL ANALOG MODULATION
Input:8
Transfer Function:
High Bandwidth Mode
Small Signal Bandwidth:9Large Signal Bandwidth:10
Low Bandwidth Mode:

Temperature Control Range:2
Thermistor Setpoint
Resolution:
Accuracy:3
Short-Term Stability (1 hr.):4
Long-Term Stability (24 hrs.):5
Output Type:
Compliance Voltage:
Maximum Output Current:
Maximum Output Power:
Current Noise and Ripple:6
Current Limit
Range:
Set Accuracy:
Control Algorithm:

0–500mA
0.2mA±0.7mAPHOTODIODE FEEDBACKType:

CURRENT SOURCE1

391637239163743916376

500mA/9W

1A/9W

1.5A/9W

0–500mA

0–1000mA

0–1500mA

10µA±0.1% of FS
6V (adjustable voltage limit)<50ppm/°C<20ppm<50ppm20µA±0.1% of FS
6V (adjustable voltage limit)<50ppm/°C<20ppm<50ppm40µA±0.1% of FS
4.75V (adjustable voltage limit)<50ppm/°C<20ppm<50ppm<10µA rms
<5µA rms<10µA rms
<5µA rms<12µA rms
<8µA rms

<3mA
<4mA
<8mA

<3mA
<5mA
<10mA

<3mA
<5mA
<10mA

0–500mA
0.2mA±0.7mA

0–1000mA
0.4mA±1.4mA

0–1500mA
0.6mA±4.5mA

0–7.5V
0.1V±0.2V

0–7.5V
0.1V±0.2V

0–7.5V
0.1V±0.2V

TEMPERATURE CONTROL OUTPUTLASER CURRENT OUTPUT
Output Current Range:
Setpoint
Resolution:
Accuracy:
Compliance Voltage:
Temperature Coefficient:
Short-Term Stability (one-hour):2
Long-Term Stability (24 hours):3
Noise and Ripple4
High bandwidth:
Low bandwidth:
Transients
Operational:5
1kV EFT:
Surge:63916371
TEMPERATURE CONTROL1 500mA/9W

LDC
3908

0–500.00mA
0.01mA±0.05% of FS
0–5000µA
0.1µA±2µA (at 25°C)
0.00–1000.00µA/mW
0.01µA/mW
0.00–5000.0mW
100µW
0.00–7.5V
10mV
±7mV

Temperature
Range:7
Accuracy:3
Thermistor ResistanceRange:
Accuracy:
TEC Current
Range:
Accuracy:
Voltage
Range:
Resolution:
Accuracy:8

Thermistor (2-wire NTC)
100µA
5100–13,000Ω, typical
Steinhart-Hart, 3 constants–99.9°C to 199.9°C±0.5°C
5100–13,000Ω±5Ω–1.50 to 1.50A±0.04A–9.999 to 9.999V
100mV (1mV in GPIB)±70mV (±20mV in GPIB)NOTES
The 3916371 Laser Current Source specifications are the same as the 3916372
Controller Module specifications.
Current Source Notes and Temperature Control Notes are on the following pages.

LASER DRIVE LIMIT SETTINGS
Current Limit
Range:
Resolution:
Accuracy:
Voltage Limit
Range:
Resolution:
Accuracy:

PHOTODIODE FEEDBACKType:
Photodiode Current Range:
Output Stability:7
Setpoint Accuracy:

Differential 10Ω Input, Selectable Zero Bias or 5V Reverse Bias on all modules
0–5000µA
0–5000µA
0–5000µA±0.01%±0.01%±0.01%±0.1% of FS±0.1% of FS±0.1% of FS

EXTERNAL ANALOG MODULATION
Input:8
Transfer Function:
High Bandwidth Mode
Small Signal Bandwidth:9Large Signal Bandwidth:10
Low Bandwidth Mode:

0–10V, 50Ω
50mA/ V

0–10V, 50Ω
100mA/ V

0–7.5V, 50Ω
200mA/ V

DC to 1.2 MHz
DC to 1.0MHz
DC to 30kHz

DC to 1.0MHz
DC to 1.0MHz
DC to 30kHz

DC to 0.9MHz
DC to 0.9MHz
DC to 30kHz

0–500.00mA
0.01mA±0.05% of FS

0–1000.0mA
0.01mA±0.05% of FS

0–1500.0mA
0.03mA±0.07% of FS

0–5000µA
0.1µA
±2µA

0–5000µA
0.1µA
±2µA

0–5000µA
0.1µA
±2µA

0.0–1000.00µA/mW
0.01µA/mW

0.0–1000.00µA/mW
0.01µA/mW

0.0–1000.00µA/mW
0.01µA/mW

0.0–5000.00mW
100µW

0.0–5000.00mW
100µW

0.0–5000.00mW
100µW

0.00–7.5V
10mV (1mV through GPIB)±7mV (±2mV through GPIB)

0.00–7.5V
10mV (1mV through GPIB)±7mV (±2mV through GPIB)

0.00–5V
10mV (1mV through GPIB)±7mV (±2mV through GPIB)LASER CURRENT MEASUREMENT (DISPLAY)
Output Current
Range:
Resolution:
Accuracy (@25°C):
Photodiode Current
Range:
Resolution:
Accuracy (@25°C):
Photodiode Responsivity
Range:11
Resolution:
Optical Power
Range:
Resolution:
Forward Voltage
Range:
Resolution:
Accuracy:12

CURRENT SOURCE NOTES
1
2
3
4
5

6

All values relate to a one-hour warm-up period.
Over any one-hour period, half-scale output.
Over any 24-hour period, half-scale output.
Measured optically, evaluating noise intensity of a laser diode into a photodetector with
150kHz bandwidth.
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.

7

Maximum monitor photodiode current drift over any 30-minute period. Assumes
zero drift in responsivity of photodiode.
8 Modulation input is 50Ω terminated inside the mainframe.
9 250mA setpoint, 50mA modulation current, 1Ω load.
10 50% modulation at mid-scale output, 1Ω load.
11 Responsivity value is user-defined and is used to calculate the optical power.
12 Four-wire voltage measurement while driving calibration load. Specification valid forvalues above 10mV.

8 Channel Laser
Diode Controller

LDC
3908
8 Channel Laser
Diode Controller

LDC
3908

Specifications
Controller Modules (Laser and TE Control)continued
TEMPERATURECONTROL139163723916374

500mA/9W

1A/9W

3916376
1.5A/9W

OUTPUT

Temperature Control Range:2
Temperature Setpoint
Resolution and Accuracy:–20°C to 20°C:
20°C–50°C:
Short-Term Stability (one-hour):4
Long-Term Stability (24 hours):5
Output Type:
Compliance Voltage:
Short Circuit Output Current:
Maximum Output Power:
Current Noise and Ripple:6
Current Limit
Range:
Set Accuracy:
Control Algorithm:–99°C to 150°C
Resolution Accuracy
0.1°C±0.2°C
0.2°C±0.2°C<±0.007°C<±0.01°C
Bipolar current source>7V DC
1.5A
9W<1mA rms–99°C to 150°C
3Resolution Accuracy
0.1°C±0.2°C
0.2°C±0.2°C<±0.007°C<±0.01°C
Bipolar current source>7V DC
1.5A
9W<1mA rms–99°C to 150°C
3Resolution
Accuracy3
0.1°C±0.2°C
0.2°C±0.2°C<±0.007°C<±0.01°C
Bipolar current source>7V DC
1.5A
9W<1mA rms

0–1.5A±0.05A
Smart Integrator,
Hybrid PI
Gain adjustablefrom 1–127

0–1.5A±0.05A
Smart Integrator,
Hybrid PI
Gain adjustablefrom 1–127

0–1.5A±0.05A
Smart Integrator,
Hybrid PI
Gain adjustablefrom 1–127

Thermistor (2-wire NTC)
10/100µA
25–450,000Ω, typical
Steinhart-Hart, 3 constants

Thermistor (2-wire NTC)
10/100µA
25–450,000Ω, typical
Steinhart-Hart, 3 constants

Thermistor (2-wire NTC)
10/100µA
25–450,000Ω, typical
Steinhart-Hart, 3 constants–99.9°C to 199.9°C±0.5°C–99.9°C to 199.9°C±0.5°C–99.9°C to 199.9°C±0.5°C

0.01–450.00kΩ±0.05kΩ0.01–450.00kΩ±0.05kΩ0.01–450.00kΩ±0.05kΩ0.001–45.000kΩ±0.005kΩ

0.001–45.000kΩ±0.005 kΩ

0.001–45.000kΩ±0.005kΩ–1.50 to 1.50A±0.04A±0.01A–1.50 to 1.50A±0.04A±0.01A–1.50 to 1.50A±0.04A±0.01A–9.999 to 9.999V
100mV (1mV in GPIB)±70mV (±20mV in GPIB)–9.999 to 9.999V
100mV (1mV in GPIB)±70mV (±20mV in GPIB)–9.999 to 9.999V
100mV (1mV in GPIB)±70mV (±20mV in GPIB)

8 Channel Laser
Diode Controller

TEMPERATURE SENSOR
Types:
Thermistor Sensing Current:7
Usable Thermistor Range:
User Calibration:

TEC MEASUREMENT (DISPLAY)
Temperature:
Range:8
Accuracy:
Thermistor Resistance
10µA Setting
Range:
Accuracy:9
100µA Setting
Range:
Accuracy:10
TEC Current
Range:
Accuracy:
Current Resolution:
Voltage
Range:
Resolution:
Accuracy:11

TEMPERATURE CONTROL NOTES
1
2

When coupled with the LDM-4616 Modular Laser Diode Mount,the LDC-3916 Multi-Channel Controllers provide a configurable,
cost-effective solution for multi-channel DWDM signal sources. The
mount can also support many popular 980nm and 1480nm pumplaser diodes for EDFA test applications.

All values relate to a one-hour warm-up period.
Software limits of range. Actual range possible depends on thephysical load, thermistor type, and TEC module used.
3 Accuracy figures are quoted for a typical 10kΩ thermistor and100µA current setting for –5°C to 50°C and typical 100kΩ
thermistor and 10µA current setting for –20°C to –5°C. Accuracy figures are relative to the calibration standard. Bothresolution and accuracy are dependent upon the user-defined
configuration of the instrument.
4 Over any one-hour period, half-scale output, controlling an
LDM-4412 mount at 25°C with 10kΩ thermistor on 100µA setting.
5 Over any 24-hour period, half-scale output, controlling an LDM4412 Mount at 25°C with 10kΩ thermistor on 100µA setting.
6 Measured at 1A output over a bandwidth of 10Hz to 10MHz.
7 Thermistor current range software selectable by front panel or
GPIB.
8 Software limits of display range.
9 Using a 10kΩ thermistor, controlling an LDM-4412 mount over
–30°C to 65°C (~200–2kΩ) or a 100kΩ thermistor controllingan LDM-4412 mount over 10°C–85°C (~200–10kΩ).
10 Using a 10kΩ thermistor, controlling an LDM-4412 mount over
–5°C to 90°C (~45–1kΩ).
11 Voltage measurement accuracy while driving calibration load.
Accuracy is dependent upon load used.
12 Measured at 2A output over a bandwidth of DC to 25MHz.

High-Stability TEC Control
Keeps Your Device Temperature
in Check
Equipped with a smart integrator control loop
and an expanded gain setting range, the temperature control circuits optimize settling times.
These modules also provide voltage measurement of your TEC and allow internal selectionof thermistor current ranges via front-panel or
GPIB. Achieve unparalleled temperature stabilities with ultra-stable design topology and low
noise bipolar output stages.

Flexible Control Over a
Wide Range of Applications
By combining true modularity with highchannel density, the LDC-3908 easily grows
with your applications. When coupled with our
16-channel mounting tray, this controller also
serves as a cost effective DWDM optical source
set. Simply mount your choice of WDM DFB
laser diodes in the mounting tray, connect tothe controller, and you’ll have full control over
8 WDM signal sources at a time. If your specified test wavelengths change, simply drop in

new DFB laser diodes. For even higher channel
counts, add another controller and mounting tray
to your rack. If your device drive specifications
change, look to ILX Lightwave for new modules
that can be easily added to your system in the
future.

Protect Your Investment with theLeader in Laser Diode Protection
The LDC-3908 8 Channel Controller
provides all of ILX Lightwave’s proven laser
protection features like independent current
limits, slow-start turn-on circuits, and isolated
power supplies.* The adjustable compliancevoltage capability brings even greater levelsof protection to your devices. Designed
for time-critical production test needs, theLDC-3908 will satisfy your test requirements with
fast, reliable, and secure laser diode control.
* Semiconductor lasers are sensitive devices. Always take appropriate
antistatic precautions and use extreme care when handling laser diodes. For
more information, request ILX Application Note #3, “Protecting Your
Laser Diode.”

LDC
3908
8 Channel Laser
Diode Controller

Specifications

Dual Current Source Modules*
Front Panel Interface
Provides Simple Operation
The front-panel interface features a brightvacuum fluorescent display, making theinformation readable from almost any angle. You
can easily monitor the operations of up to fourchannels at a time. Simple and intuitive menus,
supported by screen-specific soft-keys, allow you
to quickly configure and operate each channel.
Menu depths have been intentionally limited tokeep the front-panel operation concise, whilemore sophisticated operations are reserved for
the GPIB interface. Setpoints and other values
can be entered through your choice of numeric
keypad entry, up-down arrow keys, or a rotary
adjustment knob.

Powerful GPIB Interface Offers
Robust, Automated Control
A powerful processor platform drives the LDC3908 8 Channel Laser Diode Controller. Whencoupled with GPIB technology from National
Instruments’ HS488 TNT chipset, you get all theprocessing capability needed for mission-criticalproduction testing. With microprocessors oneach module, the mainframe engine manages
8 independent control channels quickly andreliably. Free LabVIEW® instrument drivers areavailable upon request or by downloading themfrom www.ilxlightwave.com.

High Performance Modules
Support Future System Expansion
Designed to provide the cleanest, safest
power available for laser diode control, each
module’s control functions are handled locallyand communicated quickly to the host processor.
On-board intelligence simplifies future additionof modules since all operational and calibration
data is stored in the module. Simply plug in yournew module and power up the system. Your

3916332

CURRENTSOURCE
mainframe never needs to leave the rack. This
simplicity, coupled with low noise, high stability
outputs, and state-of-the-art laser diode protection
equals ultimate performance.

State-of-the-Art Current Source
Design Brings New Levelsof PerformanceThis new current source topology uses aninnovative, proprietary control loop and incorporates the latest techniques for signal filtering andcircuit board shielding. These advancements
provide unbeatable stability and unparallelednoise performance, ideal for the most demanding
production test applications. This design also
incorporates adjustable compliance voltage andfaster shutoff, helping prevent dangerous “reconnect” transients that can occur from intermittent
connections between the controller and yourlaser diode. This new level of protection adds toour proven list of protection features: independent
current limits, output shorting circuits, and a slow
start turn-on feature.

Dual 500mA

LASER CURRENT OUTPUT
Output Current Range:
Setpoint
Resolution:
Accuracy:
Compliance Voltage:

0–500mA

3916334

Dual 1A

0–1000mA

10µA
20µA
0.1% of FS
0.1% of FS
6V
6V(adjustable voltage limit)
Temperature Coefficient:<50ppm/°C<50ppm/°C<20ppmShort-Term Stability (one-hour):2 <20ppm
3<50ppmLong-Term Stability (24-hours): <50ppm
Noise and Ripple4
High Bandwidth:<10µA rms
<12µA rms
Low Bandwidth:<5µA rms<8µA rms
Transients
5
<3mA
<3mA
Operational:
1kV EFT:
<4mA
<5mA
6
<8mA
<10mA
Surge:LASER DRIVE LIMIT SETTINGS
Current Limit
Range:
Resolution:
Accuracy:
Voltage Limit
Range:
Resolution:

0–500mA
0.2mA±0.7mA

0–1000mA
0.4mA±1.4mA

0–7.5V
0.1V

0–7.5V
0.1V

PHOTODIODE FEEDBACK

Differential 10Ω
Input.
Selectable Zero
Bias or 5V
Reverse Bias
0–5000µA
0.01%±0.1% of FS

Type:Photodiode Current Range:
Output Stability:7
Setpoint Accuracy:

0–10V, 50W
50mA/V

0–10V, 50W
100mA/V

New Capabilities from theFlexible Current Source You Trust
Operational modes including constant current,
constant current high-bandwidth, or constant
optical power are selectable from the front panel
or via the GPIB interface. Measurement of yourlaser diode’s forward voltage is possible with 4-wireaccuracy, which can be helpful in production environments where longer cable runs are common. A
single, rear-panel modulation port can individuallyenable direct modulation of each channel’s laser
current. This new current source design supports
modulation bandwidths of up to 1.2MHz (small
signal), achieving the highest direct modulationlevels available today. Modules also include
reverse photodiode bias capabilities, especially
important for telecom wavelength devices.

TEC Modules

TEMPERATURE 3916550
Dual 9W
CONTROLTEMPERATURE SENSOR
Types:

7

Thermistor Sensing Current:
Usable Thermistor Range:
User Calibration:

Thermistor(2-wire NTC)
10µA/100µA
25–450,000Ω, typical
Steinhart-Hart,
3 constants

Dual1ADC to 1.2MHz
DC to 1.0MHz
DC to 30kHz

DC to 1.0MHz
DC to 1.0MHz
DC to 30kHz

LASER CURRENT
MEASUREMENT (DISPLAY)
Output Current
Range:
Resolution:
Accuracy (at 25°C):
Photodiode Current
Range:
Resolution:
Accuracy (at 25°C):
Photodiode Responsivity
Range:11
Resolution:
Optical Power
Range:
Resolution:
Forward Voltage
Range:
Forward Voltage
Resolution:12
Accuracy:13

0–500.0mA
0.01mA±0.05% of FS

0–1000.0mA
0.01mA±0.05% of FS

0–5000µA
0.1µA
±2µA

0–5000µA
0.1µA
±2µA

0.00–1000.00µA/mW 0.00–1000.00µA/mW
0.01µA/mW
0.01µA/mW
0.0– 5000.00mW
100µW

0.0– 5000.00mW
100µW

0.00– 7.5V

0.0– 7.5V

10mV
±7mV

10mV
±7mV

*Two isolated laser sources in each module.
1 All values after a one-hour warm-up period.
2 Over any one-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. powerline plug removal).
6 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.
7 Maximum monitor photodiode current drift over any 30-minute period. Assumes zero drift in
responsivity of photodiode.
8 Modulation input is 50Ω terminated inside the mainframe.
9 250mA setpoint, 50mA modulation current, 1Ω load.
10 50% modulation at mid-scale output, 1Ω load, high bandwidth mode.
11 Responsivity value is user-defined and is used to calculate the optical power.
12 1mV through GPIB.
13 Four-wire voltage measurement while driving calibration load. Specifications valid for values
above 10mV. Accuracy is ±2mV through GPIB.

3916558

3916550

Dual 9W

Single 24W (3A)

TEMPERATURE CONTROL OUTPUT

Temperature Control Range:2 –99.9°C to 150°C
Temperature Setpoint
Resolution Accuracy3
Resolution and Accuracy:–20°C to 20°C:
0.1°C±0.2°C
20°C–50°C:
0.2°C±0.2°C
Short-Term Stability (one-hour):4 <±0.007°C
Long-Term Stability (24-hours):5 <±0.01°C
Output Type:
Bipolar current source
Compliance Voltage:>6V DC
Maximum Output Current:
1.5A
Maximum Output Power:
9W
Current Noise and Ripple:<1mA rms6
Current Limit
Range:
0.1–1.6A
Set Accuracy:±0.05A
Control Algorithm:
Smart Integrator,
Hybrid PI Gain adjustable from 1–127

High Bandwidth Mode
Small Signal Bandwidth:9Large Signal Bandwidth:10
Low Bandwidth Mode:

3916334

Dual 500mA

DUAL CURRENT SOURCE NOTES
Differential 10Ω
Input.
Selectable Zero
Bias or 5V
Reverse Bias
0–5000µA
0.01%±0.1% of FS

EXTERNAL ANALOG MODULATION
Input:8
Transfer Function:

3916332–99.9°C to 150°C

Resolution Accuracy3
0.1°C±0.2°C
0.2°C±0.2°C<±0.007°C<±0.01°C
Bipolar current source>8V DC
3A
24W<2mA rms12
0.1–3.10A±0.05A
Smart Integrator,
Hybrid PI Gain adjustable from 1–127
Thermistor(2-wire NTC)
10µA/100µA
25–450,000Ω, typical
Steinhart-Hart,
3 constants

3916558

Single 24W (3A)

TEC MEASUREMENT (DISPLAY)
Temperature
Range:8
Accuracy:
Thermistor Resistance
10 µA Setting
Range:
Accuracy:
100 µA Setting
Range:
Accuracy:
TEC Current
Range:
Accuracy:
Voltage
Range:
Resolution:
Accuracy:11

NOTES–99.9°C to 199.9°C±0.5°C–99.9°C to 199.9°C±0.5°C

0.01–450.00kΩ±0.05kΩ9

0.01–450.00kΩ±0.05kΩ90.001–45.000kΩ±0.005kΩ100.001–45.000kΩ±0.005kΩ10–1.50 to 1.50A±0.04A–3.00 to 3.00A±0.04A–9.999 to 9.999V
100mV (1 mV in GPIB)±70mV (±20mV
in GPIB)–10.75 to 10.75V
100mV (1mV in GPIB)±70mV(±20mV
in GPIB)

See Current Source Notes and Temperature Control Notes under Controller Modules
Specifications.

LDC
3908
8 Channel Laser
Diode Controller

LDC
3908
8 Channel Laser
Diode Controller

Specifications

Product Features

GENERAL

3908

3916

Chassis Ground:
GPIB Connector:
RS-232 Connector:
Power Requirements:

4mm Banana Jack
24-pin IEEE-488
9–pin D–sub
50–60Hz; selectable voltage
100V, 120V, 220V, 240V,(+6%, –10%)133mm x 482mm x 389mm
5.25" x 18.98" x 15.3"4mm Banana Jack
24-pin IEEE-4888
9–pin D–sub
50–60Hz; selectable voltage
120V, 220V, 240V,(+6%, –10%)133mm x 482mm x 653mm
5.25" x 18.98" x 25.7"

20 kg (44lbs)
24kg (52lbs)
0°C to 40°C
–40°C to 70°C
20–85%, noncondensing
Keyswitch, Interlock, Output Delay:(Meets 21CFR1040.10)
Vacuum fluorescent, 64 x 128 pixels
83 mm x 41 mm

34.4kg (76lbs)
41kg (91lbs)
0°C to 40°C
–40°C to 70°C
20–85%, noncondensing
Keyswitch, Interlock, Output Delay:(Meets 21CFR1040.10)
Vacuum fluorescent, 64 x 128 pixels
83mm x 41mm

Size (HxWxD):
Weight (typical)
Mainframe Only:
With Modules:
Operating Temperature:
Storage Temperature:
Humidity:1
Laser Safety Features:
Display:

Mainframe

8 independent channels
with up to 16 isolated outputs
Fast GPIB/IEEE-488 interface“Smart” modules for flexibility andspeed

Laser Current SourcesHigh compliance voltage
Direct modulation up to 1.2MHz
Four-wire measurement of laser
diode forward voltage

NOTES
1

Advanced laser protection features
including adjustable voltage limit

Based on the vacuum fluorescent display specification.

LabVIEW® is a registered trademark of National Instruments.

The LDC-3908 8-Channel Laser Diode Controller has
all of the same great features as our popular LDC-3916
16-Channel Laser Diode Controller. In fact, modules areinterchangeable between the two instruments. The smaller
size and lighter weight of the LDC-3908 make it an ideal
instrument for smaller channel count applications such as
R&D or production test of EDFAs and Raman amplifiers.
Handles on the front panel and flip-up feet on thebottom facilitate bench-top use, while flanges facilitate
installation into standard 19 inch instrument racks. “Smart”
modules include controller modules with up to 1.5A oflaser current source and 9W of TEC control, dual current
source modules with two isolated currents of up to 1A, adual 9W TEC module, a 3A laser current module, and a
3A 24W TEC module.

TEC Controllers

This product has passed all CE requirements and bears the CE mark.

TEC voltage measurement

In keeping with our commitment to continuous improvement, ILX Lightwave reserves the right to change specifications without notice and without
liability for such changes.

Resistive heater control adapters
available

ORDERING INFORMATION
LDC-3908
LDC-3916
LDC-3916371
LDC-3916372
LDC-3916374
LDC-3916376
LDC-3916332
LDC-3916334
LDC-3916338
LDC-3916550
LDC-3916558
RM-137
RM-1388-Channel Laser Diode Controller
Mainframe
16-Channel Laser Diode
Controller MainframeHigh TEC Resolution
500mA/9W Controller Module
500mA/9W Controller Module
1A/9W Controller Module
1.5A/9W Controller Module
500mA/ 500mA Dual Current
Source Module
1A /1A Dual Current Source
Module3A Current Source Module
9W/9W Dual Temperature (TEC)
Controller Module
3A (24W) Temperature (TEC)
Controller Module
Rack Mount Kit, 20.5" holespacing
Rack Mount Kit, 25" hole spacing

CC-305S

Current Source/Laser Diode Mount
Interconnect Cable
CC-306S
Current Source/UnterminatedInterconnect Cable
CC-316M
Laser Current Cables (bundle of 8)
CC-501STE Controller/UnterminatedInterconnect Cable
CC-505STE Controller/Laser Diode Mount
Interconnect Cable
CC-516M
TE Controller Cables (bundle of 8)
LNF-320
Low Noise Filter
LDM-4616
16-Channel Laser Diode Mount
LDM-4604/xBFY Butterfly Module for LDM-4616 Mount
LDM-4604/xDFB DFB Butterfly Module for LDM-4616 Mount
LDM-4604/xDIL
DIL Module for LDM-4616 Mount
UCA-350
Unipolar Heater Control Adapter
LabVIEW® Instrument Driver

8 Channels of Laser Diode Control

For information call
1-800-459-9459
P.O. Box 6310, Bozeman, MT 59771 • FAX: 406-586-9405

www.ilxlightwave.com

International Inquiries: 406-556-2481
email: sales@ilxlightwave.com
REV02.062705

LDC
3908
8 Channel Laser
Diode Controller