I have a video signal coming from a composite video out (we can ignore audio at this point). Products such as EasyCAP can convert such signal to usb differential(d+/d-) signal. Arduino/raspberrypi can process the incoming signal voltage from usb and modulate the LED accordingly. Modulate LED light to transmit the digital usb signal (d+/d-) to the receiver end. At the receiver end the generated optical signal needs to be converted back to equivalent voltage, this voltage will be fed to a usb-->composite video converter to play on the screen in real time. (At Receiver end is a PD to convert light to voltage. Again, for processing either arduino/raspberry pi.)
Now, From usb i have d+ and d- differential signal coming out. How do I achieve equivalent optical signal from it? How do I establish the half duplex system (any code)?
Thank you in advance.