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

265 €

Ref.: DRV200-A-200

Quantity Price
1+ 265 €
5+ 245 €
25+ 225 €

Koheron DRV200 is an ultra-low noise current driver that combines 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: 1 mA/V, 10 mA/V or 100 mA/V.

Product details

  • Laser current: 0 - 200 mA
  • Supply voltage VS: 5 V (4.6 - 5.5 V)
  • Compliance voltage at 100 mA: 3 V
  • Compliance voltage at 200 mA: 2 V
  • 3 dB modulation bandwidth: 6.8 MHz
  • Current monitor gain: 20 mV / mA (measured at IMON pin)
  • Temperature coefficient: 15 ppm / °C max. 20 ppm / °C (max. 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

More laser diode drivers


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


Discover more hardware