基于啁啾FBG的三角形光脉冲发生器的优化设计.pdfVIP

第44卷第4期 红外与激光工程 2015年4 月 Vol.44No.4 InfraredandLaserEngineering Apr.2015 基于啁啾 FBG的三角形光脉冲发生器的优化设计 张 岩，裴 丽，王一群，黄 琳，刘 超 (北京交通大学 光波技术研究所，北京 100044) 摘 要院提出了利用啁啾光纤布拉格光栅(FBG)和马赫增德尔调制器产生三角形光脉冲的优化方案。 方案采用FBG模拟单模光纤的色散特性，结合光载波抑制调制产生了三角形光脉冲, 并通过仿真分 析，选择FBG 的长度、调制深度、适当的折射率切趾函数对三角形光脉冲的线性特征进行了优化。仿 真结果表明，在同一啁啾系数下，产生的三角形光脉冲的失真程度随啁啾光纤光栅的调制深度增大而 增大，光栅长度、折射率切趾函数对三角形光脉冲的影响也比较明显。与现有系统相比，由于将FBG 引入系统，省去长距离的光纤，优化方案系统结构更为简单，三角形光脉冲线性特征更好。 关键词院三角形光脉冲； 啁啾光纤光栅； 色散； 光载波抑制调制 中图分类号院TN929.11 文献标志码院A 文章编号院1007-2276(2015)04-1306-05 Optimization of optical triangular pulses generator based on chirped fiber Bragg grating Zhang Yan, Pei Li, Wang Yiqun, Huang Lin, Liu Chao (Institute of Lightwave Technology, Beijing Jiaotong University, Beijing 100044, China) Abstract: An optimized scheme was proposed to generate optical triangular pulses by using chirped fiber Bragg grating (FBG) and Mach鄄Zehnder modulator. Optical triangular pulses were obtained based on dispersion character of standard single鄄mode fiber substituted for a chirped FBG combined with optical carrier suppression modulation. The obtained triangular pulses linear feature was optimized by simulation analysis of length, modulation index, and appropriate apodization of FBG. The simulation results indicate that the distortion of finally generated triangular pulses increase with the modulation index忆s raising under the same chirp coefficient. The length of fiber grating and the apodization also have an obvious impact on the triangular pulses. Compared with the present generator, the proposed system has distinct advantages of simple configuration and the triangular pulses ha