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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。
An optimized scheme of generating triangular light pulses by using chirped fiber Bragg grating (FBG) and Mach-Zehnder modulator is proposed. In the scheme, the dispersion characteristics of single-mode fiber with FBG are simulated, and triangular light pulses are generated by combining with the modulation suppression of light-carrier. The length and depth of FBG are selected through simulation analysis. The appropriate refractive index apodization function is used to measure the linear characteristics of triangular light pulse Optimized. The simulation results show that under the same chirp factor, the distortions of the triangular light pulses generated by the chirped fiber grating increase with the increase of the modulation depth, and the influence of grating length and refractive index apodization on the triangular light pulse is also obvious . Compared with the existing system, FBG is introduced into the system, eliminating the need for long-distance optical fibers. The system structure of the optimization scheme is simpler, and the linear optical pulse characteristics of the triangle are better.