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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。
The adverse effect of wavefront distortion caused by atmospheric turbulence on homodyne binary phase shift keying (BPSK) coherent optical communication system is illustrated by studying the system BER under different atmospheric turbulence conditions. The results show that the atmospheric turbulence-induced aberrations can act on the coherent optical communication system independently of the system signal-to-noise ratio (SNR), resulting in bit errors. Even in the case of an infinite SNR, the error is prone to occur when the peak-to-valley value (PV) of the received optical signal is greater than one wavelength, and the requirement for the wavefront PV becomes more severe as the SNR decreases. In addition, atmospheric turbulence caused by fluctuations in light intensity and phase distortion will lead to a sharp decline in the coherent mixing efficiency, thereby increasing the system error rate.