What I am interested in here specifically is - how are bits represented? Is it as "1" is represented with a sent photon [at those specific frequencies] and "0" with a .. silence (no photon sent) ? ... but this, in that case, would get really complicated, because other photons from other sources would interfere and the "silence" would easily be filled with something. .. or is this avoided by making the silence not necessarily as long [think wavelength] as the photons, so that, even if disturbance occurs, it cannot possibly be interpreted to be from the same signal as the timing would not mach they would overlay .. so only the photon that comes i at specific time is registered.. im just really just thinking out loud here as I write. But this bothers me. At a fundamental level.