| Coherent system has enormous potential for space optical communication in the future because of its high sensitivity, high modulation rate and high security.Aim at the design of receiving system in coherent optical communication, the technology of demodulation using the OPLL is provided. Also, the thesis analyzes the feasibility that the carrier phase of receiver is estimated by digital signal processing (DSP) on homodyne-detected signal. States the specific programs of the phase-estimation by DSP according to the features of homodyne detection. By establishing a model of space coherent optical communication, simulations are conducted by Optisystem and Matlab. The results shows:the carrier phase-estimation and data-demodulation by DSP are valid in homodyne-detected system. And can meet the performance-required for coherent system. |
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