基于交叉相位调制的孤子脉冲压缩效应研究

Soliton Pulse Compression Based on Cross-phase-modulation in Anomalous Dispersive Optical Fiber

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 。

In anomalous dispersive fiber, fundamental soliton pulse have the desirable property i.e. their shape and pulse width are invariant during propagation along the fiber. A new method to compress fundamental soliton pulses in the anomalous dispersion regime through cross-phase-modulation for pump pulse and soliton pulse is proposed. Two nonlinear coupled equations were established to describe the propagation of pulses in the fiber and solved numerically. It is found that the fundamental soliton can be compressed by using the method of the cross-phase modulation and exists an optimum value of fiber length in the compression. It is also found that the pump pulse power, pump frequency chirp and various pulse widths have great effects on soliton pulse compression. In order to obtain large compression factor, pump pulses with negative chirp and narrow pulse-width are desirable selected.