基于光纤相位共轭和色散的慢光系统

项目名称： 基于光纤相位共轭和色散的慢光系统

项目编号： No.60878007

项目类型： 面上项目

立项/批准年度： 2009

项目学科： 金属学与金属工艺

项目作者： 杨昌喜

作者单位： 清华大学

项目金额： 35万元

中文摘要： 基于光纤非线性效应的慢光技术，可用于设计制造延迟线、缓存器和路由器等全光功能器件，是未来智能化高速全光网络中的关键技术。本课题对基于光纤非线性效应的慢光，尤其是结合高非线性光纤中四波混频相位共轭技术以及色散模块的慢光方案，进行了以下研究。1、理论和实验研究了光纤中受激布里渊散射（SBS）的特性，实验上系统研究了高非线性光纤中SBS慢光特性并进行了相应分析，获得了近15ns的慢光延迟量。2、基于波长转换和色散的慢光实现方法，发展了高非线性光纤产生超连续谱技术与光纤色散相结合实现连续可调延时；实验获得了3.175ns的延时量，利用该方法有望获得高达800ns的延时量。3、对基于光纤四波混频（FWM）波长转换和色散的慢光实现进行了详细和系统的实验研究，并提出了几种基于FWM和色散相结合进行慢光的方案。实现了2ns左右的脉冲延迟或脉冲提前，并讨论了增大延迟量至μ#37327;级的方法。此外还从理论和实验两方面深入研究了非相干光的四波混频效应。这些研究为高性能光纤延迟线和全光缓存器等的实现和应用提供了支持。

中文关键词： 光速减慢；四波混频；受激布里渊散射；超连续谱产生；波长转换

英文摘要： Slow light technology based on nonlinear optical effects in fibers can be served as all-optical functional devices, such as delay line, buffer and router, which is the key technology in the high speed all optical network in the near future. In this project, slow light based on fiber nonlinear effects, especially the combination of four-wave mixing (FWM) and dispersion, are investigated. 1. The stimulated Brillouin scattering (SBS) in fibers are studied theoretically and experimentally. The slow light effect based on SBS in high nonlinear fiber (HNLF) is studied and analyzed. Approximate 15ns delay is achieved. 2. Based on the slow light technique using wavelength conversion and dispersion, a scheme to achieve wideband continuously tunable delays in all-fiber system is proposed, which uses fiber dispersion and supercontinuum generation of the signal pulse in HNLF. A delay of 3.175ns is experimentally demonstrated and the potential delay up to 800ns can be achieved using this scheme. 3. Slow light based on FWM wavelength conversion and optical fiber dispersion is investigated, and several schemes based on FWM and dispersive module are proposed. About 2ns delay or advancement are achieved. The method to increase the slow light delay up to micro-seconds is also discussed. Besides, FWM in HNLF involving incoherent waves is investigated theoretically and experimentally. Those investigations will help to realize high-efficiency fiber delay lines and all-fiber buffers.

英文关键词： slow light; four-wave mixing; stimulated Brillouin scattering; supercontinuum generation; wavelength conversion