Low noise butterfly laser diode controller

PRODUCTS > PHOTONICS > LASER DRIVERS > LOW NOISE BUTTERFLY LASER DIODE CONTROLLER
400 mA low noise butterfly laser controller
400 mA low noise butterfly laser controller CTL100 ZIF socket CTL100 with butterfly laser CTL100 current noise CTL100 current stability CTL100 temperature coefficient CTL100 modulation transfer function CTL100 mechanical drawing

Koheron CTL100 is a low noise current driver with modulation combined with a temperature controller. It is designed to drive narrow-linewidth laser diodes in Type 2 butterfly package. It is compatible with floating diodes, which means that neither the anode nor the cathode should be connected to the case. It drives up to 400 mA laser current with a current noise density of only 450 pA / √Hz. The CTL100 fits in a 75 mm x 75 mm square, uses a single 5 V supply, and can operate between 0 and 50°C. The CTL100 is conduction-cooled. It comes with an aluminium base plate and a zero insertion force socket for easy mounting.

990 €

CTL100-B-400
400 mA / 10 MHz bandwidth

Quantity Price
1+ 990 €
4+ 845 €
20+ 690 €

Resources

Specifications

Reference CTL100-B-400
CTL100-A-400
Current driver
Laser current 5 - 400 mA 5 - 400 mA
Compliance voltage at 400 mA 2.3 V 2.3 V
RMS noise (10 Hz - 1 MHz) 510 nArms at 20 mA / V modulation 386 nArms at 20 mA / V modulation
Current noise density (1 kHz) 450 pA / Hz1/2 450 pA / Hz1/2
1 / f corner noise 20 Hz 20 Hz
Temperature coefficient 15 ppm / °C 15 ppm / °C
Current limit 420 mA 420 mA
Slow start (90 % setpoint) 1000 ms 1000 ms
Modulation gains 2 mA / V, 20 mA / V, 200 mA / V 2 mA / V, 20 mA / V, 200 mA / V
3 dB modulation bandwidth 11 MHz 150 kHz
AC modulation cutoff frequency 1.5 MHz 70 kHz
TEC controller
Maximum current 1.2 A 1.2 A
Temperature range 12 °C to 25 °C (standard 10 K thermistor) 12 °C to 25 °C (standard 10 K thermistor)
Compliance voltage 3.4 V when cooling, 0.7 V when heating 3.4 V when cooling, 0.7 V when heating
Temperature stability 0.0015 °C / °C 0.0015 °C / °C
Laser power monitor
Photodiode current 0 - 1 mA 0 - 1 mA
Gain 3.9 V / mA 3.9 V / mA
Frequency range DC - 50 MHz DC - 50 MHz
Other
Dimensions 75 mm x 84.7 mm x 20 mm 75 mm x 84.7 mm x 20 mm
Weight 103 g 103 g
Supply voltage 4.9 V to 5.5 V 4.9 V to 5.5 V
Operating temperature 0 °C - 50 °C 0 °C - 50 °C

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Current driver

Current stability

Current stability is depicted in the following figure showing a 24-hour long evolution of current, set to 350 mA at 25 °C ambient temperature. After a 2 h warm-up time, current is stable within +/- 5 ppm.

CTL100 current stability

Evolution of current, set at 350 mA. Measured with a Keysight 34470A digital multimeter across a 5 Ohm resistor.

The figure below shows the current variation for different ambient temperatures between 5 and 55 °C. Temperature coefficient is below 15 ppm/°C.

CTL100 temperature coefficient

Current modulation

DC current modulation input

A modulation input from DC to 100 kHz is available (10 MHz for the CTL100-A-400).

A jumper allows to choose between 3 modulation gains (2 mA/V, 20 mA/V or 200 mA/V).

AC modulation input

An AC modulation input using a bias-tee is available for modulation frequencies above 100 kHz (3 MHz for the CTL100-B-400). The actual modulation gain depends on the value of the resistor integrated in the laser.

CTL100 modulation transfer function

Transfer functions of the modulation inputs with 100 kHz bandwidth (CTL100-A-400)

CTL100 modulation transfer function

Transfer functions of the modulation inputs with 10 MHz bandwidth (CTL100-B-400)

Current noise

The power spectral density of the CTL100-A-400 current noise was characterized for the 3 modulation gains.

CTL100 current noise

Current noise integrated between 10 Hz and 1 MHz is 385 nA, 386 nA and 406 nA RMS at the low, medium and high gain settings respectively.

Temperature controller

The temperature controller consists of a precision Wheatstone bridge, an analog PID controller and a linear current driving stage. PID gains are fixed and have been adjusted for a typical butterfly laser diode. Temperature setpoint is adjusted with an ultra high precision trimming potentiometer.


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