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在负色散区 ,基本孤子在光纤中传输时其波形与脉宽保持不变。提出一种在负色散区利用交叉相位调制效应压缩基本孤子脉冲的新方法。采用分步傅里叶方法对非线性耦合方程进行了数值计算与模拟。研究了不同抽运功率、不同抽运脉冲啁啾参数以及不同脉宽对基本孤子脉冲压缩的影响。发现基本孤子脉冲不仅能够被压缩 ,而且光纤存在最佳压缩长度。在抽运功率一定的条件下 ,选取负啁啾的抽运脉冲 ,可获得更高压缩比的压缩光脉冲。另外 ,不同的脉冲宽度对孤子脉冲的压缩产生较大的影响 ,一般情况下 ,选用较窄的抽运脉冲易于产生较短的压缩光脉冲
In the negative dispersion region, the basic soliton waveforms and pulse widths remain the same when transmitted in an optical fiber. A new method of compressing fundamental soliton pulses by cross-phase modulation in negative dispersion region is proposed. The non-linear coupling equations are numerically calculated and simulated using a step-and-step Fourier method. The effects of different pumping powers, chirp parameters of different pumping pulses, and different pulse widths on the compression of basic soliton pulses were studied. It was found that not only basic soliton pulses can be compressed, but also the optimal compression length of optical fiber. Under the condition of a certain pumping power, a negative chirped pumping pulse is selected to obtain a compressed light pulse with a higher compression ratio. In addition, the different pulse width of the soliton pulse compression has a greater impact, under normal circumstances, the use of narrow pumping pulse is easy to produce shorter compressed light pulse