基于非线性光纤布拉格光栅的宽带慢光缓存器

项目名称： 基于非线性光纤布拉格光栅的宽带慢光缓存器

项目编号： No.11204236

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 物理学I

项目作者： 陈涛

作者单位： 西安交通大学

项目金额： 30万元

中文摘要： 基于慢光技术的光缓存器是目前实现全光路由的关键，它需要满足宽带宽、宽可调谐延迟的要求。传统的超短脉冲慢光技术在利用介质色散产生慢光的同时，往往会引起脉冲的展宽，大大限制了光缓存器件的应用带宽。本项目针对目前超短脉冲慢光缓存技术存在的带宽窄、脉冲展宽等问题，提出基于非线性光纤布拉格光栅的慢光效应和时间孤子效应，实现延迟可调的宽带慢光缓存器；研究飞秒激光相位掩模技术在具有高光学非线性的光纤中刻写光栅结构的关键技术，以及非线性光纤布拉格光栅中的慢光效应和光孤子形成动力学过程；通过优化布拉格光栅的周期结构调控光子带隙带边结构，以增大器件的带宽；选择具有高非线性的碲酸盐等玻璃光纤制备布拉格光栅，降低超短脉冲在光纤中形成光孤子的阈值，补偿慢光系统的色散以保证器件带宽；展示低阈值、宽带宽、延迟可调的布拉格光栅慢光缓存器，带宽优于1GHz，阈值低于0.5kW，脉冲延迟调谐量超过2ns。

中文关键词： 光纤布拉格光栅；飞秒激光；光开关；慢光；

英文摘要： Optical buffer based on slow light techniques is the key to realize the all-optical router, which should satisfy the requirements of broad bandwith and wide variable delay range. The traditional slow light producing techniques will broaden the pulse and limit the bandwidth, as the material dispersion is utilized. In this project, we propose to realize the delay-tunable broadband slow light buffer based on the slow light effect and temporal soliton effect of nonlinear fiber Bragg gratings (FBG) to overcome the problems presented in current slow light techniques, such as narrow bandwidth and pulse broadening. The study includes: (1) Developing the key technique of inscribing Bragg grating in nonlinear optical fiber utilizing femtosecond laser pulses and phase mask, and investiging slow light effect as well as the formation dynamic of temporal soliton in fiber. (2) Increasing the device bandwidth by controlling the band-edge condition via optimizing the perodic structure of the Bragg grating. (3) Improving the device bandwidth by compensating the dispersion of FBG using solition, and decreasing the peak power threshold for soliton formation using FBG based on highly nonlinear optical fiber such as tellurate glass fibe. The final goal is to exhibit the broadband delay-tunable slow light buffer, characterized by the

英文关键词： Fiber Bragg grating；femtosecond laser；optical switch；slow light；