It is some years since I last tried optical communications. This has been because of my poor health. 481THz is easy: all gear was home made and test gear is simple. In most ways nanowaves are easier than microwaves. My "speciality" was non line of sight (NLOS) using digital techniques. I also had one 2-way optical QSO over about 11km. Then I had a stroke and everything stopped!
My experiments used low cost red LEDs. At some point I'd like to try infrared. My tripod was low cost. A better one is really needed as aiming is important.