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.
0-200 mA laser current
0-40 mA laser current
|Laser current||0 - 200 mA||0 - 40 mA|
|Supply voltage VS||5 V (4.6 V - 5.5 V)||5 V (4.6 V - 5.5 V)|
|Compliance voltage||3 V at 100 mA, 2 V at 200 mA||3 V at 20 mA, 2 V at 40 mA|
|3 dB modulation bandwidth||6 MHz||8 MHz|
|Current monitor gain||20 mV / mA (at IMON)||100 mV / mA (at IMON)|
|Temperature coefficient||15 ppm / °C (up to 20 ppm / °C)||15 ppm / °C (up to 20 ppm / °C)|
|RMS noise (10 Hz - 1 MHz)||255 nArms||65 nArms|
|Current noise density (1 kHz)||270 pA / Hz1/2||55 pA / Hz1/2|
|Current limit||200 mA||42 mA|
|Slow start (90 % setpoint)||990 ms||990 ms|
|Modulation gains||1 mA / V, 10 mA / V, 100 mA / V||200 µA / V, 2 mA / V, 20 mA / V|
|Dimensions||62 mm x 38 mm x 12 mm||62 mm x 38 mm x 12 mm|
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The figure below shows the current noise of the DRV200-A-200 (in blue) for a current setpoint of 80 mA:
Current noise was measured across a 30 Ω precision resistor sensed with a 5000 V/V instrumentation amplifier. The resulting noise floor is below 60 pA/Hz1/2.
Current noise integrated from 10 Hz to 1 MHz is 224 nArms. The noise of the Koheron DRV100 (293 nArms) is shown for comparison.
Modulation performance was characterized with a DFB laser controlled with a current bias of 50 mA (IMON = 1 V). The DRV200-A-200 modulation gain is set to 100 mA/V. A waveform generator controls the driver with a sine wave modulation of 500 mVpp, resulting in a current modulation between 25 and 75 mA. The modulation is then detected by a 150 MHz bandwidth PD100 photodetector and observed on a spectrum analyzer:
The frequency response of the system is shown below. 3 dB modulation bandwidth is 6.8 MHz.