The Study Of Coherent Optical Communication Of Heterodyne Asynchronous Demodulation Technology

In free space optical communications, Coherent optical communication have advantages of high sensitivity, long distance relay, large capacity of communication and so on. The technology has been the research hotspot by scholars from various countries, Also become the great potential choice in development of future space laser communication .This paper is the study of heterodyne receiver mode, Paper gives the demodulation of heterodyne asynchronous in the program receiver, and then simulated it. The paper also conducted a study of mixing efficiency, And did the simulations of the affects from signal light's and LO optical's amplitude,Gaussian beam waist radius and detector size,Space loss of supporting and wave area bending for mixing efficiency. At last, this paper described the impact of two factors in coherent optical communications: Doppler frequency shift and Vibration.this paper only did some work on primary design and calculations ,However, only do a lot of detailed demonstrations and some feasible trial, can this project realization come true.