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理论分析和讨论了基于频域相位共轭技术的交叉相位调制所致信号失真的复原和补偿机理,数值模拟了在交叉相位调制作用下,高斯脉冲在中距相位共轭光纤系统中的传输演化过程.结果表明,频域相位共轭技术能够抑制交叉相位调制对光纤系统中传输信号的损害,复原其所导致的信号失真,并能够同步补偿群速度色散和自相位调制非线性效应所导致的信号失真.合适的初始脉冲时延和初始脉冲啁啾有利于频域相位共轭技术对交叉相位调制所致信号失真的抑制.
The mechanism of signal distortion recovery and compensation due to cross-phase modulation based on frequency-domain phase conjugation is theoretically analyzed and discussed. The propagation evolution of Gaussian pulse in a phase-conjugate fiber system is numerically simulated under cross-phase modulation The results show that the frequency domain phase conjugation technique can restrain the cross-phase modulation from damaging the transmission signal in the optical fiber system and recover the signal distortion caused by it, and can simultaneously compensate the group velocity dispersion and self-phase modulation nonlinear effects Signal distortion. The appropriate initial pulse delay and initial pulse chirp are conducive to the frequency domain phase conjugation technique to suppress cross-phase modulation caused by signal distortion.