Low noise laser diode driver with modulation

Low noise current driver with 5 MHz modulation bandwidth
DRV200 - 200 mA low noise laser diode driver
DRV200 - 200 mA low noise laser diode driver DRV200 - Current noise DRV200 - Modulation bandwidth DRV200 - Mechanical drawing

275 €

Ref.: DRV200-A-200

Quantity Price
1+ 275 €
5+ 255 €
25+ 235 €

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.

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Specifications

Parameter Value
Laser current 0 - 200 mA
Supply voltage VS 5 V (4.6 V - 5.5 V)
Compliance voltage at 100 mA 3 V
Compliance voltage at 200 mA 2 V
3 dB modulation bandwidth 6 MHz
Current monitor gain 20 mV / mA
Temperature coefficient 15 ppm / °C (up to 20 ppm / °C)
RMS noise (10 Hz - 1 MHz) 230 nArms
Current noise density (1 kHz) 240 pA / Hz1/2
Current limit 200 mA
Slow start (90 % setpoint) 990 ms
Modulation gains 1 mA / V, 10 mA / V, 100 mA / V
Dimensions 62 mm x 38 mm x 12 mm

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Characterization

Noise performance

The figure below shows the current noise of the DRV200-A-200 (in blue) for a current setpoint of 80 mA:

Current noise measurement

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

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:

Modulation setup

The frequency response of the system is shown below. 3 dB modulation bandwidth is 6.8 MHz.

Modulation bandwidth

Options

DRV200-A-200
275 €
DRV200-A-40
275 €
Laser current 0 - 200 mA 0 - 40 mA
RMS noise (10 Hz - 1 MHz) 230 nArms 60 nArms
Current noise density (1 kHz) 240 pA / Hz1/2 48 pA / Hz1/2
3 dB modulation bandwidth 6 MHz 8 MHz
Modulation gains 1 mA / V, 10 mA / V, 100 mA / V 200 µA / V, 2 mA / V, 20 mA / V

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