We have developed two versions of a simple, LabVIEW-controlled laser communication protocol. Both versions use one computer's DAQ card to write a message, and a second computer's DAQ card to read and decode the message. The two versions are amplitude- and frequency-shift keying. Supporting electro-optical components include a laser, photodiode, and low-pass filter (ASK), or two frequency-stable lasers, a phase-locked loop, photodiode, Schmitt trigger, and low-pass filter. The options for the receiving computer to post the message to Twitter or to play the message through a speaker are also included.
Click here to download a .zip file of materials for this laboratory project.