As the title says, I would like to add an external Bias tee to modulate a high frequency signal into a laser diode, because the laser driver I have chosen does not have a built-in modulation circuit. I have bought the MLD203P1 laser diode driver from Thorlabs. This laser driver does not have the modulation circuit, so I decided to add an external bias-tee to it. The typical application of the MLD203P1 is seen below.
What I know so far is that a bias-tee consists of an inductor and a capacitor, which is in parallel and with one DC-input, one AC-input and one AC+DC output. So I think this should be the solution. This is seen below.
I just only need a modulation range of 10 kHz to 20 MHz. I have also read the datasheet of the MLD203P1 and don't see a problem if I attach the external bias to the LDA (Laser diode Anode). Although, I will add a current limit resistor between the LDA and the DC input of the Bias Tee.
So I wonder if this is working or has anyone tried it with another laser driver? And is this the right path I am following, to get a modulation signal of the laser diode?