光学学报, 2013, 33 (6): 0606002, 网络出版: 2013-05-14
大气湍流像差对空间零差二进制相移键控相干光通信误码性能的影响
Effect of Atmospheric Turbulence Aberration on the Bit-Error Performance of Homodyne Binary Phase Shift Keying Coherent Optical Communication
光通信 零差二进制相移键控 大气湍流像差 误码率 相干混频效率 optical communications homodyne binary phase shift keying atmospheric turbulence aberration bit error rate coherent mixing efficiency
摘要
通过研究不同大气湍流条件下的系统误码率(BER)来说明大气湍流引起的波前畸变给零差二进制相移键控(BPSK)相干光通信系统带来的恶劣影响。结果显示,大气湍流引起的像差可以独立于系统信噪比(SNR)作用于相干光通信系统,导致误码出现。即使在SNR无限大的情况下,当接收光信号的波面峰谷值(PV)大于一个波长后,就容易出现误码;并且随着SNR的降低,对波面PV的要求更加严格。另外,大气湍流引起的光强起伏和相位畸变会导致相干混频效率急剧下降,从而增加系统误码率。
Abstract
The bit error rate (BER) at different atmospheric turbulence conditions is analyzed, which illustrates the adverse affection of wave-front aberration caused by atmospheric turbulence on binary phase shift keying(BPSK) coherent optical communication system. Atmospheric turbulence aberration can act on optical communication system, which leads to bit error and is independent of system signal-to-noise ratio (SNR). Simulation results note that bit error is prone to emerge in the case of infinite SNR, when the peak-to-valley (PV) value of wave-front of received optical signal is greater than one wavelength. And the PV value of wave-front is strictly required with the decreasing of SNR. In addition, coherent mixing efficiency decreases rapidly, which is caused by the intensity fluctuation and phase aberration, consequently, resulting in the system bit error rate increasing.
武云云, 李新阳, 饶长辉. 大气湍流像差对空间零差二进制相移键控相干光通信误码性能的影响[J]. 光学学报, 2013, 33(6): 0606002. Wu Yunyun, Li Xinyang, Rao Changhui. Effect of Atmospheric Turbulence Aberration on the Bit-Error Performance of Homodyne Binary Phase Shift Keying Coherent Optical Communication[J]. Acta Optica Sinica, 2013, 33(6): 0606002.