4 September 2015 The performance of coherent receiver controlled by the phase lock loop in dual rate free-space laser communication
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Abstract
The technique of differential phase shift keying(DPSK) modulation is applied into demodulating phase information in the coherent optical receiver. The dual rate free-space receiving structure on the base of Mach-Zehnder delay interferometer with the lens is used suitably for differential delay which is equal to the one bit corresponding to a certain data rate. Delay distance at the interference receiver is varied with transmission rata from satellite to ground. Differential information is obtained by the subtraction of the two successive wave-front phases when made to interfere. The phase demodulation is extremely sensitive to phase fluctuation. Because of the incident light through atmospheric turbulence, the wave-front of optical signal became jittered in the temporal and spatial domain rapidly. In the paper, the dual rate free-space laser communication receiver for phase lock to stable signal light phase is proposed, increasing the homodyne efficiency and decreasing the bit error rate.
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Xiaoping Ma, Xiaoping Ma, Jianfeng Sun, Jianfeng Sun, Peipei Hou, Peipei Hou, Wei Lu, Wei Lu, Qian Xu, Qian Xu, Liren Liu, Liren Liu, } "The performance of coherent receiver controlled by the phase lock loop in dual rate free-space laser communication", Proc. SPIE 9614, Laser Communication and Propagation through the Atmosphere and Oceans IV, 96140T (4 September 2015); doi: 10.1117/12.2187226; https://doi.org/10.1117/12.2187226
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