25 September 2013 The effect of the light size and telecommunication rate on homodyne detection efficiency in the satellite-to-ground laser communication
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Abstract
Atmospheric turbulence influences the wave-front, and reduces homodyne detection efficiency and bit error rate in the Satellite-to-Ground Laser Communication. Free-space differential interference structure based on differential phase shift keying (DPSK) is applied in the optical signal receiver. The free-space Mach-Zehnder delay interferometer without lens is suited for differential delay which is equal to the one bit period. Differential information is obtained by the subtraction of the two successive wave-front phases when made to interfere. Differential distance at the interference receiver is varied with transmission rate from satellite to ground. And through the receiving telescope, the spot size of incident signal light within the interference became small than before, which influences the interference efficiency of the two unequal branches. So that, it is significant for increasing homodyne efficiency to determine the optical signal rate and choose the magnification of receiving telescope. In this paper, the effect of the spot size of incident light and transmission data rate on homodyne detection efficiency is analysed. By the simulation result of efficiency in different spot size and transmission date of incident light, the homodyne efficiency will be predicted in the given data rate and light spot size on the basis of experiment setup. And application condition of free-space differential structure at DPSK differential receiver is proposed.
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Xiaoping Ma, Jianfeng Sun, Yanan Zhi, Wei Lu, Qian Xu, Liren Liu, "The effect of the light size and telecommunication rate on homodyne detection efficiency in the satellite-to-ground laser communication", Proc. SPIE 8874, Laser Communication and Propagation through the Atmosphere and Oceans II, 887414 (25 September 2013); doi: 10.1117/12.2022979; https://doi.org/10.1117/12.2022979
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