For my project I need to design a cheap VCSEL laser driver which can be modulated up to 10 MHz. My laserdiode is VCSEL-1550 nm-T (built-in TEC and no monitordiode for APC). Datasheet link is here: https://www.oequest.com/getDatasheet/id/13138-13138.pdf.
In my previous design of the VCSEL laser driver, I have employed a laser driver IC-chip from Thorlabs with MAX1978 as TEC-controller. This works well. However, the laser driver chip is costly and is not programmable, so I am searching for alternatives.
What I have searched so far are vcsel laser drivers, for example, MAX3996CTP+, but don't suit to our application. Alternatively, ADN8810, a 12-bit programmable current source, can be used. Now, with this IC-chip I would like to use is as a VCSEL laser driver. Unfortunately, there is no modulation feature. From the internet, I have found out that you can use a bias-tee, but it's quite difficult to design for low to moderate frequencies. Is there an alternative configuration for modulating VCSEL laserdiode in combination with ADN8810?
Square wave or sine wave with a modulation bandwidth of up to 10 MHz is fine to me. My absolute maximum laser current is 25 mA, but we will only use laser currents up to 20 mA.
This picture is from https://www.analog.com/media/en/technical-documentation/data-sheets/ADN8810.pdf