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色散渐减光纤(DDF)和3dB光纤耦合器构成的非线性光纤环镜(DDF—NOLM)具有无基座脉冲压缩的效应,给出了达到最佳脉冲压缩效应的物理条件。结果表明:光纤环的最佳长度主要由入射脉冲的孤子阶数决定。在光纤环中反向传输两脉冲的压缩效果区别越大则脉冲峰值处的相对相位差越接近于0,从而使DDF—NOLM达到脉冲压缩的最佳条件。
Nonlinear fiber loop mirror (DDF-NOLM) consisting of DDF and 3dB fiber coupler has the effect of no base pulse compression, and gives the physical conditions to achieve the best pulse compression effect. The results show that the optimal length of fiber ring is mainly determined by the order of soliton of incident pulse. The greater the difference between the compression effects of the two pulses transmitted in the fiber loop, the closer the relative phase difference at the peak of the pulse is to 0, so as to make the DDF-NOLM reach the optimum condition for pulse compression.