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基于大气湍流影响下的空间相干光通信系统模型和孔径平均效应的平面波模型,通过数值模拟研究了弱光强波动条件下孔径平均效应以及大气湍流内外尺度对相干光通信系统误码率和接收孔径直径最优值的影响。研究结果表明:孔径平均效应能够有效减小相干光通信系统的误码率,改善系统性能;原始信噪比越高,传输距离越短,波长越长,相位补偿模式的J值越大,接收孔径直径越接近最优值,孔径平均效应对误码率的改善效果越明显;孔径平均效应会影响接收孔径直径的最优值,相位补偿模式的J值越大,影响越明显;系统误码率和接收孔径直径最优值会随着大气湍流内尺度的增大而相应增大,随着大气湍流外尺度的减小而相应减小。研究结果将为空间相干光通信系统设计提供必要的理论依据。
Based on the model of the coherent optical communication system under atmospheric turbulence and the plane wave model of the average aperture effect, the numerical simulation of the average aperture effect under weak light intensity fluctuation and the effect of the turbulent internal and external scale on the error rate and the receive aperture The effect of the optimum diameter. The results show that the average aperture effect can effectively reduce the bit error rate of coherent optical communication system and improve the system performance. The higher the original SNR is, the shorter the transmission distance and the longer the wavelength are, the larger the J value of the phase compensation mode is. The closer the aperture diameter is to the optimal value, the more the aperture average effect will improve the error rate. The average aperture effect will affect the optimal aperture diameter. The larger the J value of phase compensation mode is, the more obvious the effect is. The system error code The optimal values of the rate and the diameter of the receiving aperture increase correspondingly with the increase of the internal turbulence in the atmosphere, and decrease with the decrease of the atmospheric turbulence. The results will provide the necessary theoretical basis for the design of spatially coherent optical communication system.