Active Feedback Noise Reduction for Free Space Optical Communications

A method of using active feedback noise reduction for optically receiving a beam of light through a variably refractive medium, the method comprising:

• receiving, by a routing system, an inbound beam of light;
• receiving, by a splitter via a first multimode fiber from the routing system, the inbound beam of light and generating a first portion and a second portion of the inbound beam of light;
• receiving, by a second detector via a second multimode fiber from the splitter, the second portion of the inbound beam of light and generating a sampled signal;
• receiving, by a controller, the sampled signal and generating a control signal;
• receiving, by a modulator, the control signal and, via a third multimode fiber from the splitter, the first portion of the inbound beam of light, wherein the modulator is configured to attenuate, based on the control signal, the first portion of the inbound beam of light to generate an attenuated beam of light, thereby reducing a variable noise caused by a variably refractive medium;
• and
• detecting, by a first detector, the attenuated beam of light.