飞秒脉冲在高非线性光纤中产生超连续谱的特性研究

摘要/Abstract

摘要：

采用分步傅里叶方法,对飞秒脉冲在高非线性光纤中超连续谱的形成过程进行了研究,分析了脉冲峰值功率,脉冲宽度及初始频率啁啾对超连续谱特性的影响.结果表明,脉冲峰值功率、脉冲宽度以及初始啁啾对超连续谱的形成有着极其重要的影响;当脉冲峰值功率逐渐增大,超连续谱随之愈宽(-20dB处谱宽从170nm展宽到400nm以上),平坦度愈好.与之相反,脉冲宽度逐渐增大,超连续谱展宽范围减小,其平坦度也逐渐劣化;初始负啁啾有利于脉冲SC谱的展宽而正啁啾使脉冲SC谱的展宽受到一定抑制.进一步研究表明,适当的峰值功率超短啁啾脉冲在高非线性光纤传输时,得到没有泵浦成份残余的超宽且平坦超连续谱.

关键词: 光通信, 高非线性光纤, 超连续谱, 啁啾

Abstract:

The supercontinuum generation in high nonlinear fiber with the normal dispersion has been investigated the split-step Fourier method. The effect of the peak power of pump pulse, pulse width and the frequency chirp on the characteristics of the supercontinuum spectrum is analyzed. The research results show that the pulse width, peak power and initial chirp of the pump pulse are very important to flat wideband supercontinuum generation. With the increase of the peak power, the spectral width becomes wider (170nm to more than 400nm at-20dB) and the flatness of supercontinuum becomes better. By contrast, the spectral width becomes narrower and the flatness of supercontinuum becomes worser when the pulse width increases gradually. The negative initial chirp is profitable for spectrum broadening, but the positive chirp is a certain impact on spectrum broadening. It is further investigated that a broadband and flat supercontinuum without residual pump was generated from such a high nonlinear fiber pumped at the normal dispersion region.

Key words: optical communication; high nonlinear fiber;supercontinuum spectrum; chirp

江光裕陈凤英肖慧荣柴明钢. 飞秒脉冲在高非线性光纤中产生超连续谱的特性研究[J]. J4, 2010, 27(2): 198-203.

JIANG Guang-Yu, CHEN Feng-Ying, XIAO Hui-Rong, CHAI Ming-Gang. Supercontinuum generation of femtosecond pulse in high nonlinear fiber[J]. J4, 2010, 27(2): 198-203.

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