Low noise laser diode driver with modulation

PRODUCTS > PHOTONICS > LASER DRIVERS > LOW NOISE LASER DIODE DRIVER WITH MODULATION
DRV200 - 200 mA low noise laser diode driver
DRV200 - 200 mA low noise laser diode driver DRV200 - Current noise DRV200 - Modulation bandwidth DRV200 - Stability 40 hours DRV200 - Temperature coefficient DRV200 - Mechanical drawing

Koheron DRV200 drivers are ultra-low noise current drivers combining a very stable current bias with a +/-1 V modulation input from DC to 5 MHz. Current bias can be set from 0 to 200 mA with a manual potentiometer. A jumper allows to choose between 3 modulation gains.

275 €

DRV200-A-40

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Specifications

DRV200-A-40
DRV200-A-200
DRV200-A-400
Laser current 0 - 40 mA 0 - 200 mA 0 - 400 mA
Supply voltage VS 5 V or 6 V 5 V or 6 V 5 V or 6 V
Compliance voltage 5V supply 2.8 V at 50 % current max., 1.8 V at current max. 2.8 V at 50 % current max., 1.8 V at current max. 2.8 V at 50 % current max., 1.8 V at current max.
Compliance voltage 6V supply 3.8 V at 50 % current max., 2.8 V at current max. 3.8 V at 50 % current max., 2.8 V at current max. 3.8 V at 50 % current max., 2.8 V at current max.
3 db modulation bandwidth 8 MHz 6 MHz 6 MHz
Current monitor gain 100 mV / mA (up to 40 mA) 20 mV / mA (up to 200 mA) 10 mV / mA (up to 400 mA)
Temperature coefficient 30 ppm / °C 30 ppm / °C 30 ppm / °C
RMS noise (10 Hz - 1 MHz) 65 nArms 255 nArms 530 nArms
Current noise density (1 kHz) 55 pA / Hz1/2 270 pA / Hz1/2 480 pA / Hz1/2
Current limit 48 mA (ILIM H), 32 mA (ILIM L) 240 mA (ILIM H), 160 mA (ILIM L) 480 mA (ILIM H), 320 mA (ILIM L)
Slow start (90 % setpoint) 1.0 s 1.0 s 1.0 s
Modulation gains 200 µA / V, 2 mA / V, 20 mA / V 1 mA / V, 10 mA / V, 100 mA / V 2 mA / V, 20 mA / V, 200 mA / V
Dimensions 62 mm x 38 mm x 12 mm 62 mm x 38 mm x 12 mm 62 mm x 38 mm x 12 mm
Compatible lasers Floating diodes / anode-grounded Floating diodes / anode-grounded Floating diodes / anode-grounded

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Characterization

Current noise

The figure below shows the current noise of the different DRV200 laser driver variants operated at a maximum rated current:

DRV200 Laser driver current noise measurement

Current noise was measured across a 30 Ω resistor for the 40 mA laser current version (A-40) and a 5 Ω resistor for the 200 mA laser current version (A-200) and for the 400 mA laser current version (A-400).

Current stability

The figure below shows the current evolution of the 200 mA laser current version driver (A-200) delivering 200 mA over 40 hours. The ambient temperature is 25 °C. Current is measured using a 5 Ω precision resistor and a 7.5-digit digital voltmeter.

DRV200 Laser driver current stability

Fluctuation is about 10 ppm per day.

Temperature coefficient

The figure below shows the current variation for different ambient temperatures between 5 and 55 °C. Temperature coefficient is below 30 ppm/°C.

DRV200 Laser driver temperature coefficient

DC current modulation input

The DC modulation input controls the current setpoint. It combines large bandwidth and high linearity.

DRV200 Laser driver modulation transfer function for the 40 mA laser current version

Transfer functions of the modulation input. 40 mA laser current version (A-40)

DRV200 Laser driver modulation transfer function for the 200 mA laser current version

Transfer functions of the modulation input. 200 mA laser current version (A-200)

DRV200 Laser driver modulation transfer function for the 400 mA laser current version

Transfer functions of the modulation input. 400 mA laser current version (A-400)

Modulation performance are characterized using a DFB laser. Large and small signal correspond to a modulation signal of 2 Vpp and 500 mVpp, respectively. The modulation is detected by a 70 MHz DC coupled PD100 photodetector and measured on an oscilloscope.



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Revision history

  • 2 - July 2018: Add jumpers for selection of current limit (High / Low) and supply voltage (5 V / 6 V).

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