I want to drive a DFB laser in a type-2, 14-pin butterfly package. The manufacturer has provided limited information on how to bias the laser diode and could not get any information on the reference or test circuit.
The laser diode's anode is connected to the case ground. I need to DC bias the cathode with a voltage of 2V at a maximum of 200mA current using a constant current source to drive the laser without damaging it. And, I do not want to monitor its output with the internal photo diode. I just want to bias the laser diode.
I have been researching for some circuits, they are either using LM317 or very complex circuits using integrated ICs with additional controls and functionalities.
I am looking for a very simple circuit to bias my laser. Please help!