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OEM VCSEL Diode Drivers


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OEM VCSEL Diode Drivers

Features

  • Constant Current Operation
  • Modulation Input
  • Internal Triangular Modulation for Sweep Application
  • Low Noise Output Stage
  • Analog Control Outputs for Laser Current, Laser Current Limit, Monitor Photodiode Current
  • Laser Temperature Control with Standard Thermistor (VITC002 only)
  • Analog Control Outputs for Set and Actual Thermistor Resistance (VITC002 only)
  • Two Available Versions:
    • VLDC002: OEM VCSEL Driver without Temperature Controller, TO-46 Socket on Board
    • VITC002: OEM VCSEL Driver with Temperature Controller, TO-46 and TO-5 Socket on Board

The VLDC002 and VITC002 are compact and easy to use laser current controllers for VCSEL Diodes (Vertical Cavity Surface Emitting Laser). These controllers are designed to supply the low drive current typical for a VCSEL. They are well suited for OEM application as well as for flexible setups in the lab. A universal 5V DC power supply is included.

Functionality
These drivers have an onboard TO-Type Socket into which the VCSEL diodes can be directly plugged. An integrated triangular current modulation feature allows high speed sweeping of the wavelength of the VCSEL for spectroscopy applications. Alternatively, an analog input enables external wavelength modulation. An adjustable modulation current upper limit protects the laser diode from accidental damage when using either of these features.

Safe VCSEL Operation
A variety of safety measures allows easy and safe operation of VCSEL up to 25mA. Special attention has been paid to ensuring an extremely clean low noise drive current to prevent damage to the highly sensitive VCSEL Diodes. A temperature window indicator LED shows when the diode leaves a desired operation temperature range, thus providing an indication that an unwanted wavelength shift may have occurred (VITC002 only). An open circuit output detection, and an interlock which prevents damage from bad contacts enhance the safe operation of the sensitive VCSEL diodes.

Special Note: Please determine the polarity of the VCSEL being driven. The polarity of the VCSEL Laser Current Source is fixed in the AG (anode grounded) arrangement and cannot be changed. These drivers can operate only pin compatible VCSEL lasers. The VLDC002 is designed for the VCL Laser Series, while VITC002 is suited for both the VCL and VCT laser series. For more information, please see the VLDC002 or VITC002 operating manuals or contact tech support.
Specification for VLDC002 and VITC002
Current Control
Laser Diode PolarityAnode Grounded (AG), Fixed
Current Range0 - 25 mA
Compliance Voltage>5 V
Noise<0.8 µA typ.
Drift (24 h at constant ambient temperature)<5 µA
Temperature Coefficient≤± 50 ppm/°C
Current Limit0 - 25 mA
Internal Triangular Modulation
Frequency Range1 Hz - 10 kHz
Amplitude0 - 25 mA
Modulation Depth90% typ.
Balance Rise / Fall50% typ.
Analog Modulation Input
Frequency Range (-3 dB)DC - 100 kHz
Input Voltage Range0 - 2.5 V
Input impedance10 kΩ
Modulation Coefficient10 mA/V ± 5 %
Photodiode Input
Input Current Range0 to ± 2.5 mA
Input ImpedanceVirtual Ground
Control Outputs
Set Laser Current0 - 2.5 V
Actual Laser Current0 - 2.5 V
Photodiode Current0 to ±2.5 V
Min. Load Resistance for Rated Accuracy1 MΩ
Accuracy (f.s.)±1%
Connectors
Laser Socket3-pin on 2.54 mm Diameter Circle
10-pin on 5.84 mm Diameter Circle (VITC002 only)
Laser / Photodiode / InterlockD-Sub 9 pin, Female
Modulation InputSMB
PD Input:SMB
TEC Element / Thermistor (VITC200 only)D-Sub 9 pin, Male
General data
Power Supply Requirement5 VDC ±5%, Regulated,
350 mA (VLDC002), 1.3 A (VITC002)
Included Wall Power Supply90 ... 264VAC / 5VDC
Current Requirement350 mA (VLDC002), 1.3 A (VITC002)
Operating Temperature0 - 40 °C
Storage Temperature-40 - 70 °C
Dimensions PCB (W x D)VLDC002: 80 mm x 100 mm
VITC002: 80 mm x 140 mm
Dimensions Overall (W x D x H)VLDC002: 87 mm x 105 mm x 17 mm
VITC002: 87 mm x 145 mm x 17 mm

 

Additional Specifications only for VITC002
Temperature Control
TEC Current0 to ±0.2 A / ±0.8 A (Selectable)
TEC Voltage>2.5 V
Max. TEC Power>2 W
Noise and Ripple<1 mA typ.
TEC Current Limit0.2 A / 0.8 A typ. (Selectable)
Temperature Sensor
Thermistor Control Range5 to 20 kΩ
Accuracy (f.s.)2% typ.
Stability2 Ω
Reproducibility±0.1%
Temperature Window±0.5 kΩ typ.
Control Outputs
Set Thermistor Resistance+0.5 to +2.5 V
Actual Thermistor Resistance+0.5 to +2.5 V

(All accuracy data is valid at 22 ± 5 °C and 45 ± 15% rel. humidity.)
Noise data is only valid if the unit is used in a closed, metallic, grounded housing.

Included Parts

VLDC002VITC002Part
x OEM VCSEL Driver with Temp. Controller, TO-46 Socket on Board (VLDC002)
 xOEM VCSEL Driver with Temp. Controller, TO-46 and TO-5 Sockets on Board (VITC002)
xxUniversal Input Power Supply
xxOperating Manual

Laser Diode Controller Selection Guide

The table below is designed to give a quick overview of the key specifications for our laser diode controllers. For more details and specifications, or to order a specific item, click on the appropriate item number below.

Item #Drive CurrentCompliance VoltageCCaCPbModulationPackage
LDC200CV20 mA6 VYes!Yes!ExternalBenchtop
VLDC00225 mA5 VYes! Int/ExtOEM
VITC00225 mA5 VYes! Int/ExtOEM
LDC201CU100 mA5 VYes!Yes!ExternalBenchtop
LD2000100 mA3.5 V Yes!ExternalOEM
LD2000R100 mA3.5 V Yes!ExternalOEM
EK2000100 mA3.5 V Yes!ExternalOEM
LDC202C200 mA10 VYes!Yes!ExternalBenchtop
TLD001200 mA8 VYes!Yes!ExternalT-Cube
IP250-BV250 mA8 VcYes!Yes!ExternalOEM
LD1100250 mA6.5 Vc Yes! --OEM
LD1101250 mA6.5 Vc Yes!--OEM
EK1101250 mA6.5 Vc Yes!--OEM
EK1102250 mA6.5 Vc Yes!--OEM
LD1255R250 mA3.3 VYes! ExternalOEM
LDC205C500 mA10 VYes!Yes!ExternalBenchtop
IP500500 mA3 VYes!Yes!ExternalOEM
LDC210C1 A10 VYes!Yes!ExternalBenchtop
LDC220C2 A4 VYes!Yes!ExternalBenchtop
LD30002.5 A--Yes! ExternalOEM
LD3000R2.5 A--Yes! ExternalOEM
LDC240C4 A5 VYes!Yes!ExternalBenchtop
LDC40055 A10 VYes!Yes!Int/ExtBenchtop
LDC40205 A10 VYes!Yes!Int/ExtBenchtop
Dual Temperature and Current Controllers
LDC1300B1 A5 VYes!Yes!--OEM
ITC40011 A>10 VYes!Yes!Int/ExtBenchtop
ITC40055 A>10 VYes!Yes!Int/ExtBenchtop
ITC402020 A>10 VYes!Yes!Int/ExtBenchtop

a Constant Current
b Constant Power
c When using a 12 V Power Supply

We also offer a variety of rack mounted laser diode current & temperature controllers (OEM Modules, TXP Rack Modules, PRO8 Rack Modules)

VLDC002 Top View

VLDC002

CON5 - Analog and TTL Control Outputs 

CON5

PINSignalRange
1GND-
2LD ONTTL, High when the output is switched on
3ERRORTTL, High when an error occurs
4ILD SETSet laser current, 100 mV/mA
5ILD ACTActual laser current, 100 mV/mA
6IPDPhotodiode current, 1V/mA
7...10Not Connected-

CON6 - Connector for External Laser Diode

D-type Female

D-type Female

PINFunctionRange
1Interlock / LED "ON"needs low ohmic return to pin 5
2Monitor Diode GND-
3Laser Anode, GND-
4Monitor Diode In0 ... 2.5 mA
5Interlock / LED GND-
7Laser Cathode0 ... 25 mA
6,8,9Not Connected-
ShieldGND-

SO1 - Laser Diode Socket

2 or 3 Pin Laser Diodes

Laser Socket

PinFunction
1Laser Cathode
2Laser Anode, GND
3Laser Anode, GND

JP1

Interlock

Interlock

A short-circuit or at least a low resistance (R<300 Ω) must be maintained between pin 1 and pin 5 for laser power to remain "on." It is also possible to use a LED with a 1 kΩ resistor in parallel between the two pins. The LED will light up if the laser current output is switched on.

CON2 - SMB Male

External Set Input for the Laser
Current

SMB Male

CON3 - SMB Male

Modulation Input for the Laser
Current

SMB Male

CON4 - SMB Male

Input for External Photo Diode

SMB Male

VITC002 Top View

VITC002

CON7 - Connector for External Temperature Control

D-type Female

D-type Female

PINFunctionRange
2Thermistor20 µA
3Thermistor Ground-
4TEC +-0.2 ?+0.2 A / -0.8 ?+0.8 A (selectable)
5TEC -+0.2 ?-0.2 A / +0.8 ?-0.8 A (selectable)
ShieldGND-

CON5 - Analog and TTL Control Outputs 

CON5

PINSignalRange
1GND-
2LD ONTTL, High when the output is switched on
3ERRORTTL, High when an error occurs
4ILD SETSet laser current, 100 mV/mA
5ILD ACTActual laser current, 100 mV/mA
6IPDPhotodiode current, 1V/mA
7R ACTActual thermistor resistance, 100 mV/kΩ
8R SETSet Tthermistor resistance, 100 mV/kΩ
9OUT OF WINTTL, High when the thermistor resistance is out of the window
10TEC ONTTL, High when the temperature control is switched on

CON6 - Connector for External Laser Diode

D-type Female

D-type Female

PINFunctionRange
1Interlock / LED "ON"needs low ohmic return to pin 5
2Monitor Diode GND-
3Laser Anode, GND-
4Monitor Diode In0 ... 2.5 mA
5Interlock / LED GND-
7Laser Cathode0 ... 25 mA
6,8,9Not Connected-
ShieldGND-

JP1

Interlock

Interlock

A short-circuit or at least a low resistance (R<300 Ω) must be maintained between pin 1 and pin 5 for laser power to remain "on." It is also possible to use a LED with a 1 kΩ resistor in parallel between the two pins. The LED will light up if the laser current output is switched on.

JP2

Laser Temperature Window Protection

Jumper

Pull jumper JP2 to enable the temperature window protection. With the temperature window protection enabled, the laser is switched off (or cannot be switched on) while the actual thermistor resistance is out of the ±0.5 kΩ window. As soon as the actual resistance re-enters the window, the laser is switched on again (or can be switched on again).

SO1 - Laser Diode Socket

2 or 3 Pin Laser Diodes

Laser Socket

PinFunction
1Laser Cathode
2Laser Anode, GND
3Laser Anode, GND

CON2 - SMB Male

External Set Input for the Laser Current

SMB Male

S02 - Laser Diode Socket

10 Pin Laser Diodes

10 Pin Laser Diode Socket

PinFunction
1TEC +
3Laser Cathode
4Laser Anode, GND
8Thermistor GND
9Thermistor
10TEC -
2,5,6,7Not Used

CON3 - SMB Male

Modulation Input for the Laser Current

SMB Male

CON4 - SMB Male

Input for External Photo Diode

SMB Male
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Posted Comments:
Poster: Tyler
Posted Date: 2008-10-03 09:14:29.0
A response from Tyler at Thorlabs to s.obyrne: After talking to our engineers in Germany I have some additional information. They recommend using Thorlabs benchtop controller (LDC200CV) since it was designed to allow for the operation of diodes with that pin configuration. However, if an OEM type driver is necessary, the only solution is to desolder the socket and rewire it for your pin configuration. This will potentially introduce noise into the system. The more elegant solution of altering the circuit directly is not possible because the circuit board is multilayered.
Poster: Tyler
Posted Date: 2008-09-25 09:50:11.0
A response from Tyler at Thorlabs to s.obyrne: Unfortunately, it is not reasonable to make changes to the VITC002 circuit to make it compatible with a cathode grounded VCSEL. Thank you for considering Thorlabs for you photonics needs.
Poster: s.obyrne
Posted Date: 2008-09-25 06:26:06.0
I would like to use this driver with a VCSEL from a company other than vertilas. They produce their diodes with the cathode at ground, and I understand that this circuit uses anode ground. Is there anything I can do with this circuit to allow it to work with a diode whose cathode is connected to the case and the negative TEC input? Thanks
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VLDC002 Support Documentation VLDC002 VCSEL Driver without Temperature Controller, TO-46 Socket on Board $360.00
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VITC002 Support Documentation VITC002 VCSEL Driver with Temperature Controller, TO-46 and TO-5 Sockets on Board $580.00
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