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PRO8 Laser Diode Temperature Controller Modules


  • 3 Current / Power Ranges
  • Excellent Temperature Stabilization
  • Easy-to-Access PID Adjustments

TED8020 Module

TED8080 Module

PRO8000 8 Slot Chassis with LDC8000,
TED8000, ITC8000, & PDA8000 Modules

Easy to Read Display
No PC Required for Operation

Related Items


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PRO8 Laser Diode Current Control Module Options
Item # TED8020 TED8040 TED8080
TEC Current ±2 A ±4 A ±8 A
Max Output Power 16 W 32 W 64 W
Module Width 1 Slot 2 Slots
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

  • Temperature Control Range: -12.375 to 90.000 °C (Semiconductor Sensor)
  • Temperature Control Range: 5 Ω to 20 kΩ and 50 Ω to 200 kΩ (Thermistor in 2 Ranges)
  • Temperature Stability: <0.002 °C
  • TEC Current Ranges: ±2 A and 16 W, ±4 A and 32 W, ±8 A and 64 W
  • Supports Thermistors: AD590, AD592, and LM335
  • Optional Sensors (Pt 100, Pt 1000 - Replaces AD590/AD592/LM335 Sensors) Upon Request
  • Adjustable P, I and D Settings

Introduction
The TED8000 Series Modules are plug-in temperature controllers for our PRO8 Platform. They provide excellent temperature stabilization, typically ±0.001 °C (AD590 sensor), for optimal laser operation and other applications requiring precise thermal control. This facilitates highly stable operation of temperature sensitive components, for example optical nonlinear birefringent crystal, where phase matching requires sensitive control of the crystal’s temperature. Separate adjustment of the P, I and D settings of the temperature control loop enables optimal settling times for different thermal loads. The TED8000 Series of temperature controllers are ideal companions to our LDC8000 Laser Diode Current Controller Modules. When the TED8000 module is used with a laser diode control module in the same PRO8 chassis, the temperature window protection feature switches off the laser diode current if the temperature of the laser exceeds a used-defined temperature window (high and low threshold).

High Power Laser Systems
With up to 64 W of cooling power, the TED8080 is well matched to our LDC8080 Laser Diode Control Module that provides 8 A laser drive current.

TEC Safeguards
Damage to the TEC cooler is prevented by setting an adjustable TEC current limit. This can either be set via a recessed potentiometer on the module front panel (hardware limit), via the front panel softkeys or by one of the standard interfaces (software limit).

The TED8000 Series modules meet extremely high standards regarding precision and drift performance and provide a low noise, bipolar output. This enables extremely stable wavelength control and safe thermal load management.

Choice of Temperature Sensors
The TED8000 Series modules can be operated with thermistors, AD590/AD592 IC sensors and LM335 transducers. When operated with a thermistor the thermistor calibration constant can be set so that all applicable settings and displays can be done directly in °C, rather than Ω (ohms). Optionally, the TED8000 Series Controllers can be fitted to ultra low temperature applications (lead-salt lasers), where heating only is required (KRYO option).

Adjustable PID Control Loop
For optimization of laser temperature settling time the P-, I- and D- settings of the temperature control loop can be set via menu-driven softkeys or via one of the remote interfaces.

User-Friendly Controls
The PRO8 display menu allows configuration of any module in the chassis. The operational parameters are easily accessed using mneumonic symbols and simple prompts for user-friendly operations. 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.

Connection Cables
A CAB420-15 cable is required to connect the TED8000 Series Modules to a Thorlabs' Laser Diode Mount. This cable can be ordered separately. It has a length of 1.5 m, PIN Diagrams are shown below.

For further information, please contact our Tech Support Team.

Item # TED8020 TED8040 TED8080
TEC Current Control Range -2 to +2 A -4 to +4 A -8 to +8 A
Compliance Voltage >8 V
Maximum Output Power 16 W 32 W 64 W
Measurement Resolution TEC Current 0.07 mA 0.15 mA 0.3 mA
Measurement Accuracy TEC Current ±10 mA ±20 mA ± 50 mA
Measurement Resolution TEC Voltage 0.3 mV
Measurement Accuracy TEC Voltage ±20 mV
Noise & Ripple (Typical) <1 mA <2 mA <4 mA
TEC Current Limit
Setting Range (20-Turn Pot) 0 to ≥2 A 0 to ≥4 A 0 to ≥8 A
Resolution D/A Converter 0.5 mA 1 mA 2 mA
Accuracy ±20 mA ±40 mA ±80 mA
Temperature Sensors: Thermistor (TED80X0 & TED80X0PT)
Control Range 5 Ω to 20 kΩ and 50 Ω to 200 kΩ (Switchable)
Calibration Exponential Form, Steinhart-Hart
Resolution 0.3 Ω/3 Ω
Accuracy ±2.5 Ω/±25 Ω
Stability (24h), Typical <0.5 Ω/<5 Ω
Temperature Sensor: IC-Sensors (AD590 / AD592 / LM335) (TED80X0)
Control Range -12.375 to +90 °C
Calibration 2-Point Linearization
Resolution 0.0015 °C
Accuracy ±0.1 °C
Setting Resolution 0.025 °C
Stability (24 hr), Typcial < 0.001 °C
Temperature Sensor Pt100 Platinum: Optional Feature (PT) for TED80X0a
Control Range -12.375 to +90°C
Resolution 0.0015 °C
Accuracy ±0.3 °C
Stability (24 hr), Typical <0.005 °C
Temperature Sensor Pt1000 KRYO: Optional Feature (KRYO) for TED80x0; Heating Onlya
Measurement Current 1 mA / 400 μA
Control Range 20 to 310 K
Resolution 2 mK (Within Temp Range of 20 to 155 K)
Accuracy ±2 K (Within Temp Range of 20 to 155 K)
Stability (24 hr), Typical 0.005 K (Within Temp Range of 20 to 155 K)
  • Pt100 and Pt1000 options replaces AD590, AD592, and LM335 sensors

All Data valid at 23 ± 5 °C and 45 ± 15% Relative Humidity

TEC and Temperature Sensor Connector

DB15 Female

TED8xxx Series

PinConnection
1 Status-LED Anode
2 Voltage Detector TEC Element +
3 Thermistor (-), Ground
4 Thermistor (+)
5 TEC Element (+)
6 TEC Element (+)
7 TEC Element (+)
8 Status -LED Cathode (Ground)
9 Voltage Detector TEC Element (-)
10 AD590 -
11 AD590 +
12 Leave Open
13 TEC Element (-), Ground
14 TEC Element (-), Ground
15 TEC Element (-), Ground

TED8xxx-PT Series

PinConnection
1 Status-LED Anode
2 Voltage Detector TEC Element +
3 PT-100 Current Source (-), Ground
4 PT-100 Current Source (+)
5 TEC Element (+)
6 TEC Element (+)
7 TEC Element (+)
8 Status -LED Cathode (Ground)
9 Voltage Detector TEC Element (-)
10 Voltage Measurement Input (-)
11 Voltage Measurement Input (+)
12 Leave Open
13 TEC Element (-), Ground
14 TEC Element (-), Ground
15 TEC Element (-), Ground

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:
cblakesa47  (posted 2015-02-23 13:01:55.347)
Hello - I am wondering if it is possible to use the TED8020 with the PRO8000 chassis to control temperature in a heating-only configuration (using a resistive heater such as HT10K, for example, with an AD590 temperature Transducer). Thanks for your help.
tschalk  (posted 2015-02-26 11:52:14.0)
This is a response from Thomas at Thorlabs. Thank you very much for your inquiry. It is possible to use the TED in a heating-only configuration. Normally the device is used with a Peltier (TEC) element where current in one direction cools while current in the other direction heats the device. You have to make sure that current can only flow in one direction through the resistive heater. Therefore you can use two diodes to prevent the device from continuously heating up by just changing the current flow direction. I will contact you directly with detailed information.
sharrell  (posted 2012-05-21 12:05:00.0)
Response from Sean at Thorlabs: I am sorry that you had difficulty finding the CAB420-15 on our website. We have updated the link, but unfortunately this change will happen this evening when our website runs automatic updates. In the meantime, the cable may be found using this link: http://www.thorlabs.com/NewGroupPage9.cfm?ObjectGroup_ID=307. Thank you for your patience as we fix this link.
busko  (posted 2012-05-21 11:13:01.0)
I can't find CAB420-15 cable for temperature control unit. The link in description on this page just reload the current page.. Only TED modules are visible.

PRO8 Laser Diode Temperature Controller Modules

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
TED8020 Support Documentation
TED8020PRO8 TEC Controller Card, ±2 A, 16 W, Thermistor/IC-Sensor, 1 Slot
$706.62
Lead Time
TED8040 Support Documentation
TED8040PRO8 TEC Controller Card, ±4 A, 32 W, Thermistor/IC-Sensor, 1 Slot
$706.62
Lead Time
TED8080 Support Documentation
TED8080PRO8 TEC Controller Card, ±8 A, 64 W, Thermistor/IC-Sensor, 2 Slots
$845.14
Lead Time

CAB420-15 Connection Cables

The pin descriptions shown in the first two tables below denote the typical pin assignments used by Thorlabs' family of laser diode temperature controllers and laser diode mounts. The third table gives the physical pin connections between the 15-pin and 9-pin sides of the CAB420-15 cable.

CAB420-15 15 Pin Diagram
1 Status LED (+) (for TEC On/Off Indication)a
2 TEC Voltage Measurementb
3 Thermistor (-), Ground
4 Thermistor (+)
5 TEC (+)
6 TEC (+)
7 TEC (+)
8 LM 135/335 (-), Grounda
9 TEC Voltage Measurementb
10 Transducer AD 590/592 (-), LM 135/335 (+)
11 Transducer AD 590/592 (+), LM 135/335 (+)
12 No Connection
13 TEC (-), Status LED (-)
14 TEC (-), Status LED (-)
15 TEC (-), Status LED (-)
  • TTC001: No Connection
  • TED200C Series and TTC001: No Connection
CAB420-15 9 Pin Diagram
1 Status LED (+) (for TEC On/Off Indication)a
2 Thermistor (+)
3 Thermistor (-), Ground
4 TEC (+)
5 TEC (-), Status LED (-)
6 No Connection
7 Transducer AD 590/592 (-), LM 135/335 (+)
8 LM 135/335 (-), Grounda
9 Transducer AD 590/592 (+), LM 135/335 (+)
  • TTC001: No Connection
Pin Connections
15-Pin Side 9-Pin Side
1 1
2 4
3 3
4 2
5 4
6 4
7 No Connection
8 8
9 5
10 7
11 9
12 No Connection
13 5
14 5
15 No Connection
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
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