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考虑到抽运损耗、走离、色散和非线性等效应,用分步傅里叶方法求解耦合的非线性薛定谔方程组,就强脉冲信号在连续光抽运光纤参变放大器中的放大情况进行了理论研究。研究结果表明,强脉冲信号除经历振幅放大,脉冲时域展宽等过程外,还会发生令人感兴趣的脉冲分裂现象,即一个脉冲信号分裂为两个子脉冲。而且即使在连续光抽运的情况下,走离效应对强脉冲信号的放大也产生了显著影响,即促使两个子脉冲振幅不等以及脉冲漂移。最后,强脉冲信号独特的放大特性用光纤参变放大器的饱和增益特性做了很好的解释,并指出脉冲分裂现象在信号抽样、脉冲压缩、光时分复用系统中有潜在用途。
Taking into account the effects of pumping loss, dispersion, dispersion and nonlinearity, the coupled nonlinear Schrödinger equation is solved by the split-step Fourier method and the amplification of the strong pulse signal in the continuous optical pumping fiber parametric amplifier Theoretical research. The results show that in addition to the strong pulse signal amplitude amplification, pulse time domain broadening process, but also interesting pulse splitting phenomenon occurs, that is, a pulse signal split into two sub-pulses. And even in the case of continuous optical pumping, the stripping effect has a significant impact on the amplification of the strong pulse signal, that is, to promote the two sub-pulse amplitude and pulse drift. Finally, the unique amplifying characteristic of strong pulse signal is well explained by the saturation gain of fiber parametric amplifier. It is pointed out that the phenomenon of pulse splitting has potential applications in signal sampling, pulse compression and optical time division multiplexing.