摘要
利用激光脉冲在光纤光栅中传播时所遵守的相干耦合非线性薛定谔方程,通过多重尺度理论,主要研究了激光脉冲在高斯变迹布拉格光纤光栅中传输时,在反常色散区所产生的调制不稳定性和对应相关参量的关系;结果表明在反常色散区,当输入功率、传输距离一定时,当f=-1禁带之上能带底时,调制不稳定性增益的强度最强、宽度最窄;当远离能带底时强度减弱、宽度变宽;并且,增益谱都受到高斯变迹函数的制约。
Based on the coherently coupled nonlinear Schrtidinger （NLS） equation of a light pulse propagation inside tiber Bragg gratings . We have studiecl medulation instability of la.ser pulses as relationship parameter in fiber Bragg gratings with Gaussian apodization function in anomalous dispersion regime by use the method of multiple scales. The results show that modulation instability can be produced in anomalous dispersion regime. The gain spectra＇s intensity is strongest and width is narrowest at the bottom of the dispersion relation correspond to f= - 1 when input power and propagation distance have been given. The gain spectra＇ s intensity is weakening and width is brnadening when apart from the bottom of the dispersion relation. Furthermore, the gain spectra have been restrained by Gaussian apedization function.
出处
《激光杂志》
CAS
CSCD
北大核心
2008年第5期51-53,共3页
Laser Journal
基金
国家自然科学基金资助项目(批准号:60468001)
关键词
多重尺度理论
布拉格光栅
高斯变迹
调制不稳定性
method of multiple scales
bragg gratings
Gaussian apodization
modulation instability
