I want to use an AD laser driver IC to control AC and DC current applied to the laser diode (VCSEL). All ICs I found are designed to control the cathode current of the laser diode.
The problem now is that I am working with an array of laser diodes, which has the cathodes of all the diodes wired to one pin, only the lasers anodes are individually addressable. I need to be able to control AC and DC currents for each individual laser!
Is there a way I can use, for example the ADN2871, to control the anode current of the laser by inverting the ouput current - or something similar?
Thanks and kind regards,
The ADN2871 and ADN2847 are single loop laser drivers, the modulation amplitude is open loop and is set by the current in the ERSET resistor with a gain of 100.
Changing the value of the ERSET resistor or modulating the current in this resistor externall is also a way to externally control the modulation current.