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PRO8 Laser Diode Current & Temperature Control Modules


  • Low Laser Current Noise
  • Built-in Laser Diode Protection Features
  • 2 Versions: Separate or Single Output Connectors

ITC8022
Module

ITC8052
Module

ITC8102DS15
Module

Application Idea

PRO800 Chassis with ITC8052 and PDA8000 Amplifier
(Chassis and Modules Sold Separately)

Related Items


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PRO8 Laser Diode Current Control Module Options
Item # ITC8022 ITC8022DS15 ITC8052 ITC8052DS15 ITC8102 ITC8102DS15
LD Current ±200 mA ±500 mA ±1 A
Max TEC
Output Power
16 W
Connector(s)
9-Pin (LD),
15-Pin (TEC)
15-Pin
(LD & TEC)
9-Pin (LD),
15-Pin (TEC)
15-Pin
(LD & TEC)
9-Pin (LD),
15-Pin (TEC)
15-Pin
(LD & TEC)
Module Width 1 Slot
PRO8 Series Optionsa
Laser Diode Current Controllers (Up to 8 A) PRO8000-4 High-Power Chassis with Modules
TEC Temperature Controllers (Up to 64 W)
Combination Laser Diode Current (Up to 1 A) &
TEC Temperature Controllers (Up to 16 W)
DWDM DFB Laser Modulesb
Optical Switches
Photocurrent Measurement Modules
  • Our PRO8 Series Chassis can accommodate multiple PRO8 Series Modules, allowing for a customized telecom solution.
  • Please contact Tech Support for availability of desired wavelength.

Features

  • 3 Different Laser Current Ranges: ±200 mA, ±500 mA and ±1 A
  • TEC Cooling Power: ±2 A / 16 W
  • Supports All Laser and Monitor Diode Polarities (Anode Grounded / Cathode Grounded)
  • Supports Constant Current (CC) and Constant Power (CP) Mode
  • Low Noise and Highly Stable Operation
  • Multiple Built-In Laser Diode Protection Features
  • Excellent Temperature Stability (up to <0.001 °C)
  • Support for Thermistor & IC Sensors
  • Adjustable P, I and D-Settings of the PID Servo Loop for Optimal Temperature Settling Time

Combination Current & Temperature Control Modules
These modules, designed for our PRO8 platform (not included), are combination Laser Diode and TEC Temperature Controllers. Each module offers laser drive current ranges of 0 to ±200mA, 0 to ±500 mA, and 0 to ±1 A, along with a TEC controller that provides up to ±2 A/16 W.

The modules comes in two versions, a 9-pin connector for laser current output and a 15-pin connector for TEC current output (Item # ITC8022, ITC8052, or ITC8102) or with a common 15-pin connector for both laser and TEC current output (Item # Suffix DS15). See the list to the above right for the six options.

Extremely Low Noise
Every module features exceptionally low laser current noise (see Specs Tab), and exceptional temperature stability better than 0.002 °C (measured with the AD590 Temperature Sensor). They also offer the same great performance independent of the mode of operation - constant current (CC), or constant power (CP).

User-Friendly Controls
The PRO8 display menu allows for the configuration of any module in the chassis. Mnemonic symbols provide user-friendly access to all operational parameters. All settings are retained in memory and automatically recalled upon powering on the mainframe as long as modules are not being moved to a different slot.

Built-In Laser Diode Protection Features
Proven laser protection features are included to safeguard sensitive laser diodes. Besides common protection functions, such as current limits, laser current soft start, and interrupt protection, an advanced circuit design ensures that AC power-line transients or power outages, as well as RF pickup, cannot affect the laser diode. Additionally, a temperature window can be set that will shut the laser down in the event the high or low thresholds of the window are exceeded.

The controllers meet the international requirements regarding laser protection (e.g. CDRH US21 CFR 1040.10). All modules include a key-operated power switch and interlock, plus many additional features.

Calibrating the Power Display
The display of the laser power can easily be calibrated with respect to the laser's monitor diode current to provide a direct optical power read-out. This is accomplished by adjusting the “CALPD” calibration constant that is accessed via the front panel soft keys or the computer interface. Please note that an optical power meter is required for this setting procedure. See our Power Meters for more details.

Setting the Temperature Control Loop
The Proportional (gain), Derivative and Integral settings of the PID control loop can each be set independently to optimize the temperature response of the system to different thermal loads.

Connection Cables
Depending on the item chosen, different cables are required to connect the modules to a Thorlabs' Laser Diode Mount. The ITC8022, ITC8052, and ITC8102, with 2 separate connectors, require the CAB400 for the laser controller and the CAB420-15 cable for the temperature controller. The ITC8022DS15, ITC8052DS15, and ITC8102DS15, with one single connector, require the CAB430 cable. The cables have to be ordered separately.

For further information, please contact tech support.

Item #ITC8022ITC8052ITC8102
Laser Controller: Current Control
Control Range of Injection Current0 to ± 200 mA0 to ± 500 mA0 to ± 1 A
Compliance Voltage>5 V
Setting Resolution3 µA7.5 µA15 µA
Accuracy (Full Scale)±0.05 %±0.05%±0.1%
Noise without Ripple (10Hz to 10MHz, rms, typ.)<2 µA<5 µA<10 µA
Ripple (50 Hz, rms, typ.)<1 µA<1 µA<1.5 µA
Transients (processor, typ.)<15 µA<30 µA<50 µA
Transients (other, typ.)<200 µA<500 µA<1 mA
Drift (24hrs, at constant ambient temperature, typ.)<3 µA<10 µA<25 µA
Temperature Coefficient<50 ppm/ °C
Laser Controller: Power Control
Control Range of Photo Current10 µA to 2 mA
Reverse Bias Voltage0 to 10 V (adjustable)
Resolution Photo Current30 nA
Accuracy (typ.)±0.1%
Laser Controller: Current Limit
Setting Range0 to ≥ 200 mA0 to ≥ 500 mA0 to ≥ 1 A
Resolution6 µA15 µA30 µA
Accuracy±200 µA±500 µA±2 mA
Laser Voltage Measurement
Measurement Principle4-Wire (improves accuracy by compensating for cable resistance)
Measurement Range0 to 10 V
Resolution0.3 mV
Accuracy±5 mV
Temperature Controller: Output
Control Range of TEC Current-2 to +2 A
Compliance Voltage>8 V
Maximum Output Power16 W
Measurement resolution of TEC Current0.07 mA
Measurement resolution of TEC Voltage0.3 mV
Noise and Ripple Typ.<1 mA
Temperature Controller: Current Limit
Setting Range (20-Turn Pot)0 to ≥2 A
Resolution0.5 mA
Setting Accuracy±20 mA
Temperature Controller: Sensor Data
Thermistor
Control Range200 Ω to 40 kΩ (10 kΩ norminal resistance at 25 °C)
Resolution0.7 Ω
Accuracy±10 Ω
Stability (24 hrs)<1 Ω
AD590, AD592, & LM335
Control Range-12.375 to +90 °C
Resolution0.0015 °C
Accuracy±0.1 °C
Temperature Stability Typ.<0.001 °C
General Data
Width1 PRO8 Slot
LD/TEC-Connector9-pin (LD)/15-pin (TE) D-Sub (ITC8000); Common 15-pin D-Sub (ITC8000DS15)
Operating Temperature0 to 40 °C
Storage Temperature-40 to +70 °C

All Data Valid at 23 ± 5 °C and 45 ± 15% Rel. Humidity

ITC8XXX Laser Diode Contoller

DB9 Female

PinConnectionPinConnection
1Output for Interlock and Status LASER ON/OFF6Laser Diode Cathode Measurement Input for Laser Diode Voltage)
2Monitor Diode Ground7Laser Diode Cathode (with Polarity AG)
3Laser Diode Ground8Laser Diode Anode (with Polarity CG)
4Monitor Diode Input
5Pin 1 Ground9Laser Diode Anode (Measurement Input for Laser Diode Voltage)

ITC8XXX TEC Connection

DB15 Female

PinConnectionPinConnection
1Status-LED Anode9Not Connected
2Not Connected10AD590 (-)
(PT100 for TC8xxxPT)
3Thermistor Ground (-)11AD590 (+)
(PT100 for TC8xxxPT)
4Thermistor (+)
5TEC Element (+)12Not Connected
6TEC Element (+)13TEC Element Ground (-)
7Not Connected14TEC Element Ground (-)
8Status LED
Cathode (Ground)
15TEC Element Ground (-)

*Connect the TEC element and the temperature sensor with shielded cables to the TEC connector. The shielding of the cables must be connected to ground (pins 13, 14, 15).

ITC8XXXDS15 LD/TED Connection

DB15 Female

PinConnectionPinConnection
1Interlock9Laser Diode Cathode (Measurement Input for Laser Diode Voltage)
2Monitor Diode Ground10Laser diode cathode (polarity AG)
3Laser Diode Ground11Laser diode anode (polarity CG)
4Monitor Diode Anode or Cathode / Bias12Laser Diode Anode (Measurement Input for Laser Diode Voltage)
5Interlock Ground
6AD 590 (+)13AD 590 (-)
7TEC (+)14Thermistor Ground
8TEC (-) (ground)15Thermistor

The following parts are included together with each of our ITC8000 Series Current & Temperature Controllers:

  • ITC8000 Series Current & Temperature Controller Module
  • Operating Manual

PID Basics

The PID circuit is often utilized as a control loop feedback controller and is very commonly used for many forms of servo circuits. The letters making up the acronym PID correspond to Proportional (P), Integral (I), and Derivative (D), which represents the three control settings of a PID circuit. The purpose of any servo circuit is to hold the system at a predetermined value (set point) for long periods of time. The PID circuit actively controls the system so as to hold it at the set point by generating an error signal that is essentially the difference between the set point and the current value. The three controls relate to the time-dependent error signal; at its simplest, this can be thought of as follows: Proportional is dependent upon the present error, Integral is dependent upon the accumulation of past error, and Derivative is the prediction of future error. The results of each of the controls are then fed into a weighted sum, which then adjusts the output of the circuit, u(t). This output is fed into a control device, its value is fed back into the circuit, and the process is allowed to actively stabilize the circuit’s output to reach and hold at the set point value. The block diagram below illustrates very simply the action of a PID circuit. One or more of the controls can be utilized in any servo circuit depending on system demand and requirement (i.e., P, I, PI, PD, or PID).

PID Diagram

Through proper setting of the controls in a PID circuit, relatively quick response with minimal overshoot (passing the set point value) and ringing (oscillation about the set point value) can be achieved. Let’s take as an example a temperature servo, such as that for temperature stabilization of a laser diode. The PID circuit will ultimately servo the current to a Thermo Electric Cooler (TEC) (often times through control of the gate voltage on an FET). Under this example, the current is referred to as the Manipulated Variable (MV). A thermistor is used to monitor the temperature of the laser diode, and the voltage over the thermistor is used as the Process Variable (PV). The Set Point (SP) voltage is set to correspond to the desired temperature. The error signal, e(t), is then just the difference between the SP and PV. A PID controller will generate the error signal and then change the MV to reach the desired result. If, for instance, e(t) states that the laser diode is too hot, the circuit will allow more current to flow through the TEC (proportional control). Since proportional control is proportional to e(t), it may not cool the laser diode quickly enough. In that event, the circuit will further increase the amount of current through the TEC (integral control) by looking at the previous errors and adjusting the output in order to reach the desired value. As the SP is reached [e(t) approaches zero], the circuit will decrease the current through the TEC in anticipation of reaching the SP (derivative control).

Please note that a PID circuit will not guarantee optimal control. Improper setting of the PID controls can cause the circuit to oscillate significantly and lead to instability in control. It is up to the user to properly adjust the PID gains to ensure proper performance.

PID Theory

The output of the PID control circuit, u(t), is given as

Equation 1

where
Kp= Proportional Gain
Ki = Integral Gain
Kd = Derivative Gain
e(t) = SP - PV(t)

From here we can define the control units through their mathematical definition and discuss each in a little more detail. Proportional control is proportional to the error signal; as such, it is a direct response to the error signal generated by the circuit:

Equation 2

Larger proportional gain results is larger changes in response to the error, and thus affects the speed at which the controller can respond to changes in the system. While a high proportional gain can cause a circuit to respond swiftly, too high a value can cause oscillations about the SP value. Too low a value and the circuit cannot efficiently respond to changes in the system.

Integral control goes a step further than proportional gain, as it is proportional to not just the magnitude of the error signal but also the duration of the error.

Equation 3

Integral control is highly effective at increasing the response time of a circuit along with eliminating the steady-state error associated with purely proportional control. In essence integral control sums over the previous error, which was not corrected, and then multiplies that error by Ki to produce the integral response. Thus, for even small sustained error, a large aggregated integral response can be realized. However, due to the fast response of integral control, high gain values can cause significant overshoot of the SP value and lead to oscillation and instability. Too low and the circuit will be significantly slower in responding to changes in the system.

Derivative control attempts to reduce the overshoot and ringing potential from proportional and integral control. It determines how quickly the circuit is changing over time (by looking at the derivative of the error signal) and multiplies it by Kd to produce the derivative response.

Equation 4

Unlike proportional and integral control, derivative control will slow the response of the circuit. In doing so, it is able to partially compensate for the overshoot as well as damp out any oscillations caused by integral and proportional control. High gain values cause the circuit to respond very slowly and can leave one susceptible to noise and high frequency oscillation (as the circuit becomes too slow to respond quickly). Too low and the circuit is prone to overshooting the SP value. However, in some cases overshooting the SP value by any significant amount must be avoided and thus a higher derivative gain (along with lower proportional gain) can be used. The chart below explains the effects of increasing the gain of any one of the parameters independently.

Parameter IncreasedRise TimeOvershootSettling TimeSteady-State ErrorStability
KpDecreaseIncreaseSmall ChangeDecreaseDegrade
KiDecreaseIncreaseIncreaseDecrease SignificantlyDegrade
KdMinor DecreaseMinor DecreaseMinor DecreaseNo EffectImprove (for small Kd)

Tuning

In general the gains of P, I, and D will need to be adjusted by the user in order to best servo the system. While there is not a static set of rules for what the values should be for any specific system, following the general procedures should help in tuning a circuit to match one’s system and environment. In general a PID circuit will typically overshoot the SP value slightly and then quickly damp out to reach the SP value.

Manual tuning of the gain settings is the simplest method for setting the PID controls. However, this procedure is done actively (the PID controller turned on and properly attached to the system) and requires some amount of experience to fully integrate. To tune your PID controller manually, first the integral and derivative gains are set to zero. Increase the proportional gain until you observe oscillation in the output. Your proportional gain should then be set to roughly half this value. After the proportional gain is set, increase the integral gain until any offset is corrected for on a time scale appropriate for your system. If you increase this gain too much, you will observe significant overshoot of the SP value and instability in the circuit. Once the integral gain is set, the derivative gain can then be increased. Derivative gain will reduce overshoot and damp the system quickly to the SP value. If you increase the derivative gain too much, you will see large overshoot (due to the circuit being too slow to respond). By playing with the gain settings, you can maximize the performance of your PID circuit, resulting in a circuit that quickly responds to changes in the system and effectively damps out oscillation about the SP value.

Control TypeKpKiKd
P0.50 Ku--
PI0.45 Ku1.2 Kp/Pu-
PID0.60 Ku2 Kp/PuKpPu/8

While manual tuning can be very effective at setting a PID circuit for your specific system, it does require some amount of experience and understanding of PID circuits and response. The Ziegler-Nichols method for PID tuning offers a bit more structured guide to setting PID values. Again, you’ll want to set the integral and derivative gain to zero. Increase the proportional gain until the circuit starts to oscillate. We will call this gain level Ku. The oscillation will have a period of Pu. Gains are for various control circuits are then given below in the chart.


Posted Comments:
pedrueze  (posted 2015-11-04 13:01:27.1)
Dear all, I have a controller (ITC8052 module in a rack Profile PRO 8000), a cable type SR9-DB9 to use with a L9805E2P5 laser diode. As I read the manual of the module, it is not clear to me which are the parameters that I have to control in order to get the diode laser running. For example (if I see the speecsheet of this laser diode), it is not clear which are the parameters that I have to change for control: Operating volage LD reverse voltage PD reverse voltage Operating voltage I see the following parameters in the display (pag 30 in the manual): For the current: I LD I max I lim (I think this is the one that is controller by the screw, right?) I PD For the voltage: U LD U bia seems to be the ones that I have to operate, but i am not sure. Another problem is the diverse current parameters: Ilim is supposed to be the 120 mA for my laser, so I have to change this with a scredriver in the fron panel (that "brown box"?) until which point? How can I see the change in the current limit when I manipulate the screw? My intention is to switch on the laser and change the optical power by changing the power. I am not currently using a TEC so I will work at low powers. As long I have a photodiode in my laser diode, both manual and specsheet are poor self-explained on how to make it work and not burn it. Any help is very welcome. Kind regards
shallwig  (posted 2015-11-05 05:17:04.0)
This is a response from Stefan at Thorlabs. Thank you very much for your inquiry. Before running the laser diode it is important to check the laser diodes limits and its polarity. You can find these information in the spec sheet of the diode here: http://www.thorlabs.com/thorcat/6100/L9805E2P5-SpecSheet.pdf The polarity of the laser diode is anode grounded (AG). The photodiode has polarity cathode grounded (CG). The typical operating current is at 95mA while the maximum rating is 120mA. For the operating voltage the maximum is given with 1.7V. To avoid damaging the diode by not proper heat dissipation/ sufficient cooling we recommend to use a TEC element here. By inserting the diode in one of our mounts and using the appropriate cables you make sure the wiring is done correctly. Then you can follow the instruction in the manual from page 13 http://www.thorlabs.de/thorcat/7500/ITC8052-Manual.pdf First it is important to set the hardware limit current I_LIM: the laser diode current is set with the potentiometer marked I_LIM at the front panel of the ITC8. The value is displayed continually in the channel menu of the module so you can watch it during adjustment. I_Max denotes the software limit and can be changed in the channel menu. The software Limitn I_Max has same protective function as the Hardware limit I_Lim. The lower of the two limits will limit the laser diode current. If you are not using a mount from us please check the Pin Assignment of the LD connector as shown on page 16. How to use the operation menu of the PRO8 is described from page 27. You can choose between two modes, constant current or constant power. In first mode you set a laser diode current I_LD while in constant power you can control the output via monitor photodiode which is built in the laser diode. In the menu only three parameters can be shown at the same time for setting all other parameters please use the scroll functions. You can find a list of all parameters also in the manual on page 30. The monitor diode input can be operated without or with bias voltage (0 V...10 V). The polarity for the monitor diode must be set accordingly. A calibration of the monitor diode is described on page 32 in the manual. I will contact you directly to check if you need any further assistance to run your laser diode.
adan  (posted 2015-05-01 18:18:20.073)
Could you please tell us if the ITC8102 MODULE (PRICE $2160) include the following items: 1.- PRO800 chassis 2.- TEC CONTROLLER Like apear in the page of PRO8 LASER DIODE CURRENT & TEMPERATURE CONYTOL MODULES OF YOUR CATALOG.
shallwig  (posted 2015-05-04 05:35:11.0)
This is a response from Stefan at Thorlabs. Thank you very much for your inquiry. The ITC80102 Module contains a current and TEC controller but the PRO8 chassis in which you have to build in this card is not included at this price you mentioned. The different PRO8 systems can be found on our website here: http://www.thorlabs.de/newgrouppage9.cfm?objectgroup_id=895&pn=PRO800 We will contact you directly to discuss your needs in detail.

PRO8 Laser Diode Current & Temperature Control Modules

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
ITC8022 Support Documentation
ITC8022PRO8000 LD and TEC Controller, ±200mA / 16W, Dual Connector
$1,981.36
Lead Time
ITC8022DS15 Support Documentation
ITC8022DS15PRO8000 LD and TEC Controller, ±200mA /16W
$1,926.17
Lead Time
ITC8052 Support Documentation
ITC8052PRO8000 LD and TEC Controller, ±500mA / 16W, Dual Connector
$2,136.10
Lead Time
ITC8052DS15 Support Documentation
ITC8052DS15PRO8000 LD and TEC Controller, ±500mA /16W
$2,058.19
Lead Time
ITC8102 Support Documentation
ITC8102PRO8000 LD and TEC Controller, ±1A / 16W, Dual Connector
$2,390.40
Lead Time
ITC8102DS15 Support Documentation
ITC8102DS15PRO8000 LD and TEC Controller, ±1A /16W
$2,335.21
Lead Time

Laser Diode Current Controller Connection Cable

Male 9 Pin Connector Diagram
Pin Connections
1Interlock and Status LASER
ON/OFF
2Photodiode
3Laser Diode Ground
4Photodiode
5Ground for Pin 1
6Voltage Measurement Laser Diode Cathode
7Laser Diode Cathode (with Polarity Anode Grounded - AG)
8Laser Diode Anode (with Polarity Cathode Grounded - CG)
9Voltage Measurement Laser Diode Anode
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
CAB400 Support Documentation
CAB400Cable; Current Controller with 9-Pin D-Sub Connector, 1.5 m
$75.21
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Temperature Controller Connection Cable

Female 9 Pin Connector Diagram
Pin Connections
1Status LED (+) (for TEC ON/OFF indication), CAB430: N.C.
2Thermistor (+)
3Thermistor (-), Ground
4TEC (+)
5TEC (-), Status LED (-)
6N.C.
7Transducer AD 590/592 (-), LM 135/335 (+)
8N.C.
9Transducer AD 590/592 (+), LM 135/335 (+)
Male 15 Pin Connector Diagram for CAB420-15
Pin Connections
1Status LED (+) (for TEC ON/OFF indication)
2N.C.
3Thermistor (-), Ground
4Thermistor (+)
5TEC (+)
6TEC (+)
7TEC (+)
8LM 135/335 (-), Ground
9N.C.
10Transducer AD 590/592 (-), LM 135/335 (+)
11Transducer AD 590/592 (+), LM 135/335 (+)
12N.C.
13TEC (-), Status LED (-)
14TEC (-), Status LED (-)
15TEC (-), Status LED (-)
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
CAB420-15 Support Documentation
CAB420-15Temperature Controller Cable with 15-Pin D-Sub Connector, 1.5 m
$79.54
Today

Laser Diode Current Controller and Temperature Controller Connection Cable

Male 9 Pin Connector Diagram
Pin Connections
1Interlock and Status LASER
ON/OFF
2Photodiode
3Laser Diode Ground
4Photodiode
5Ground for Pin 1
6Voltage Measurement Laser Diode Cathode
7Laser Diode Cathode (with Polarity Anode Grounded - AG)
8Laser Diode Anode (with Polarity Cathode Grounded - CG)
9Voltage Measurement Laser Diode Anode
Female 9 Pin Connector Diagram
Pin Connections
1Status LED (+) (for TEC ON/OFF indication), CAB430: N.C.
2Thermistor (+)
3Thermistor (-), Ground
4TEC (+)
5TEC (-), Status LED (-)
6N.C.
7Transducer AD 590/592 (-), LM 135/335 (+)
8N.C.
9Transducer AD 590/592 (+), LM 135/335 (+)
Male 15 Pin Connector Diagram for CAB430
Pin Connections
1Interlock and Status LASER ON/OFF
2Photodiode
3Laser Diode Ground
4Photodiode
5Ground for Pin 1
6Transducer AD 590/592 (+), LM 135/335 (+)
7TEC (+)
8TEC (-)
9Voltage Measurement Laser Diode Cathode
10Laser Diode Cathode (with Polarity Anode Grounded - AG)
11Laser Diode Anode (with Polarity Cathode Grounded - CG)
12Voltage Measurement Laser Diode Anode
13Transducer AD 590/592 (-), LM 135/335 (+)
14Thermistor (-), Ground
15Thermistor (+)
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
CAB430 Support Documentation
CAB430Cable for a LD and TEC Controller with 15-Pin D-Sub Connector to a Laser Diode Mount, 1.5 m
$137.43
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