Saturday, 10 December 2016

Custom VCSEL Bias Driver

I have been working on a laser diode bias driver for a while now, in line with my latest research project. ThorLabs recently released some great looking bias driver "chip" things, the MLD203 series. I felt that I could use these on a custom board to modulate laser diodes and VCSELs using my USRPs.


In the image above (and below) you can see the two red PCBs which I have designed and constructed. The bias driver (left) connects with an SMA connector to a Bias-T from Mini-Circuits to to TO-Can laser diode adaptor PCB which is visible on the right. I have designed everything to be low noise and high frequency compatible.


Unfortunately, I made a mistake with the laser diode footprint and so I had to mount it upside down! I soldered a SMD capacitor at the point where the little red wire connects to the diode to minimise adverse high frequency effects.



Check out the Git repo for this and more: https://github.com/ManCaveMade/LDBiasDriver

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