Thread: noise in optical resonator

There is formula of Shennon wich describe relation between channel capacity and power of signal and noise in this channel. If we will use this formula for analyze some optical resonator (for example Fabri-Perrot) as telecommunication channel that we should use information about noises in it. If we imagine a simple Fabri-Perrot resonator then it will be two translucent mirrors. One mirror is input of system and another is output. This system is filter for light which pass across it. Where noise in here? What kind of noise i should analyze? The optical resonator is passiv system and i think only exist quantum noise in here.

There would also be noise caused by imperfections in the mirrors, imperfections in the optical conductor (fiber optic cables, or whatever), noise introduced from the conversion to and from light, and probably some other things I'm even less familiar with.

thx! but i think we should use only noises generated in resonator (imperfections in the mirrors). Also we should define notion noise and assign difference between notion noise and notion aberration. As for me... i think a noise is active distortion usefull signal and an aberration is passiv distortion usefull signal. That's why imperfections in the mirrors is aberration of signal (passiv). Am i right?