I had a friend who worked at Planet labs for a while - he had the craziest stories as to how laser based communication systems worked. He even had a co-worker

I had a friend who worked at Planet labs for a while - he had the craziest stories as to how laser based communication systems worked. He even had a co-worker who as a physicist had thought through how communicating with lasers between large interstellar distances could work. Very curious to see what this thread returns :)