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《Semiconductor Optoelectronics》 2016-01
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Research on Heterodyne Efficiency of Inter-satellite Coherent Laser Communication Based on Scalar Diffraction

DING Ke;LI Xiaofeng;ZHAO Hua;Key Lab.of Beam Control of the Chinese Academy of Sciences;Institute of Optics and Electronics,The Chinese Academy of Sciences;Institute of Astronautics and Aeronautics,University of Electronic Science and Technology of China;  
First,assuming that the local oscillator wave obeys gaussian distribution and the received signal wave obeys airy distribution,numerical computation was adopted to acquire the maximum heterodyne efficiency.When the ration of airy spot diameter and gaussian spot waist diameter is 1.719,the maximum efficiency is 81.45%.Second,scalar diffraction and Zernike aberrations theory of optical field ere introduced and conditions that Franuhofer diffraction can be applied to coherent focus optical field.The sampling requirements for planar,gaussian and airy optical field were calculated.Then heterodyne efficiency simulation of optical system with various aberrations:tip/tilt,defocus,astigmatism,coma,spherical and their compositions were conducted.The results reveal that the order of aberrations' influence to the efficiency from low to high is astigmatism,tip/tilt,defocus,coma and spherical;3dB efficiency loss means that tracking error should be less than 1μrad(RMS)and wave-front error should be less than 0.1λfor a coherent laser communication system.Thus this study has some guidance significance to the link loss arrangement and engineering design of opto-mechanical system.
【CateGory Index】: TN929.1
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