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由于大气湍流的影响,光束在大气中传输时产生严重畸变,造成自由空间光(FSO)通信链路性能恶化。为了提高系统性能,构建了基于盲优化自适应光学的FSO通信系统,提出了一种新的自适应增益随机并行梯度下降(SPGD)优化算法。数值模拟结果表明,本文算法对大气湍流引起的波前误差进行实时补偿,能够达到很好的校正效果,比固定增益优化算法具有更好的收敛速度和精度。
Due to the effects of atmospheric turbulence, severe aberrations in the transmission of light beams in the atmosphere cause deterioration of FSO communication link performance. In order to improve the system performance, an FSO communication system based on blind opti- mized opti- mized optics is constructed. A new adaptive parallel gradient descent (SPGD) algorithm with adaptive gain is proposed. The numerical simulation results show that the proposed algorithm compensates the wavefront error caused by atmospheric turbulence in real time and achieves a good correction effect, which has better convergence speed and precision than the fixed gain optimization algorithm.