光纤环镜中无基座脉冲产生的特性分析

Analysis of Pedestal-free Pulse Generation in Optical Loop Mirrors

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 optical loop mirrors （DDF-NOLM） constructed from dispersion-decreasing fibers （DDFs） and 3dB fiber couplers can realize pedestal-free pulse-compression, and the physical conditions for the optimal pulsecompression are given. The results show that the input pulse＇s soliton-order determines the optimal optical loop length. The larger the difference in the compression effect of the two counterpropagating pulses in optical loop, the closer to zero the relative phase difference at the pulse＇s peaks, and these make the DDF-NOLM optimized to compress pulses.