基于相移光纤光栅微分器超短光脉冲整形

董小伟; 郭盼; 刘文楷

doi:doi:10.3788/gzxb20164502.0206003

光子学报, 2016, 45 (2): 0206003, 网络出版: 2016-04-01

基于相移光纤光栅微分器超短光脉冲整形

Ultrashort Optical Pulse Shaping Based on Phaseshifted Fiber Gratings Differentiators

论文大纲

董小伟 ^*郭盼刘文楷

作者单位

北方工业大学电子信息工程学院, 北京 100144

光纤光学相移光纤光栅脉冲整形平顶方形脉冲三角脉冲 Fiber optics Phaseshifted fiber grating Pulse shaping Rectangular pulse Triangular pulse

摘要

基于耦合模理论和传输矩阵法，对相移光纤光栅的反射谱、相移特性进行了分析.结果表明，相移光纤光栅随着相移点个数的增加，反射谱透射窗口数目增多，相移发生多次跳变，从而形成对信号的微分效应，并且相移的微分阶数与所增加的相移点个数成正比.设计出基于相移光纤光栅微分特性的脉冲整形器，通过优化高斯信号各阶微分的加权系数，将高斯型输入脉冲整形成近似方形或三角形状的输出脉冲，通过调整光纤光栅第一段与第二段的长度比，使输出三角脉冲形状的失真现象得到改善.分析输入的高斯脉冲的脉宽发生±5%的波动时，输出波形依然可以获得很好的三角和平顶方形脉冲效果，从而证明了所设计的脉冲整形器的稳定性和实用性.

Abstract

Based on the transfer matrix method and the couplemode theory, the characteristics of reflective spectrum and phase shift of the phaseshifted fiber Bragg gratings were analyzed. The result showed that the transmission windows in the reflection spectrum increased and the phase jumped frequently with the increasing of the phase points, thus the differential effects on signals were generated. Besides, the phase differential orders were proportional to phaseshift points. On this basis, a pulse shaper was designed based on the characteristics of the differential phase shift grating. By optimizing the weighting factors for each order derivative of the Gaussian input pulse, the output pulse can be formed the shapes of rectangular and triangular. By changing the length ratio of the first section optical fiber grating and the second section, the distorting phenomenon of the triangular output pulse was improved. Finally, changing the Gaussian input pulse width by ±5%，the output waveform were synthesized as rectangular pulse and triangular pulse. Thus the stability and practicality of the pulse shaping system were verified.

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董小伟, 郭盼, 刘文楷. 基于相移光纤光栅微分器超短光脉冲整形[J]. 光子学报, 2016, 45(2): 0206003. DONG Xiaowei, GUO Pan, LIU Wenkai. Ultrashort Optical Pulse Shaping Based on Phaseshifted Fiber Gratings Differentiators[J]. ACTA PHOTONICA SINICA, 2016, 45(2): 0206003.

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