光子晶体光纤超连续谱的孤子俘获数值研究

通过数值求解广义非线性薛定谔方程, 本文对光子晶体光纤中超连续谱的孤子俘获现象进行研究. 利用交叉相关频率分辨光学开关(X-FROG)技术, 观测并记录了超连续谱沿着光纤长度的演化, 得到孤子俘获的整个过程. 研究发现: 当满足相位匹配条件时, 孤子与非孤子辐射波发生四波混频, 产生的俘获波频谱随着孤子红移而逐渐蓝移; 增加抽运功率, 孤子与俘获波的作用增强. 为可调谐超短脉冲和超连续谱研究提供理论依据.

Numerical simulation of soliton trapping of the supercontinuum in photonic crystal fiber

In this paper, we numerically study the soliton trapping of supercontinuum in photonic crystal fiber by solving generalized nolinear Schrödinger equation. Using the cross-correlation frequency resolved optical gating (X-FROG) technique, the propagation of the supercontinuum is recorded along the fiber and the evolution of soliton trapping is observed. When the phase-matching condition is met, new frequency of the pulse trapping is generated from four-wave mixing of soliton with nonsolitonic radiation, and is continuously blueshifted while the soliton is redshifted. Higher pump-power shows the strong interaction between soliton and nonsolitonic radiation. Provided in the paper is a theoretical basis for tunable ultra-short laser pulses and supercontinuum researches.