准连续光抽运光子晶体光纤产生超连续谱

孙婷婷; 王志; 李传起

中国激光, 2009, 36 (1): 154, 网络出版: 2009-02-10

准连续光抽运光子晶体光纤产生超连续谱

Supercontinnum Generation in Photonic Crystal Fiber by Using Quasi-Continuous Pump

论文大纲

孙婷婷 ^1,2,*王志 ²李传起 ¹

作者单位

¹ 南京信息工程大学数理学院, 江苏南京 210044

² 南开大学现代光学研究所, 天津 300071

摘要

对准连续光在光子晶体光纤中的传输特性进行了理论和实验研究。利用分步傅里叶方法求解非线性薛定谔方程, 数值模拟了准连续光在光子晶体光纤中传输时光谱和脉冲的演化, 并分析了其非线性机理和光谱展宽机制。通过比较不同条件下脉冲时域和频域的演化过程, 发现低功率、宽脉冲条件下引起光谱展宽的主要因素是光纤反常色散区的调制不稳(MI)作用。此外, 还分析了脉冲功率、光纤非线性系数、脉冲宽度等因素对光谱展宽的影响。在理论研究基础上, 将脉冲宽度为80 ps的准连续光耦合入70 m长的非线性光子晶体光纤, 获得了覆盖整个通信波段的超连续(SC)谱, 波长范围1300～1700 nm。

Abstract

In this paper, propagation of quasi-continuous wave in photonic crystal fiber (PCF) is theoretically and experimentally investigated. With the nonlinear Schrdinger equation (NLSE) and split-step Fourier transform method, evolution of spectrum and pulse profile of quasi-continuous pump is numerically simulated, and the nonlinear mechanism for supercontinnum (SC) generation is analyzed. By comparing different simulative conditions, it′s shown that modulation instability (MI) in anomalous dispersion region dominates the spectrum broadening. Moreover, the effects of pump power, pulse width and fiber′s nonlinear coefficient on SC are also studied. Based on the theoretical results, quasi-continuous wave with pulse width of 80 ps was lunched into a 70m long nonlinear PCF and SC with the spectral range from 1300 nm to 1700 nm was generated, covering the whole communication window.

参考文献

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孙婷婷, 王志, 李传起. 准连续光抽运光子晶体光纤产生超连续谱[J]. 中国激光, 2009, 36(1): 154. Sun Tingting, Wang Zhi, Li Chuanqi. Supercontinnum Generation in Photonic Crystal Fiber by Using Quasi-Continuous Pump[J]. Chinese Journal of Lasers, 2009, 36(1): 154.

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