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飞秒脉冲在高非线性光纤中产生超连续谱的特性研究

, PP. 198-203

Keywords: 光通信,高非线性光纤,超连续谱,啁啾

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Abstract:

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.

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