基于高增益光纤布里渊放大的宽带信号可控制慢光的研究

项目名称： 基于高增益光纤布里渊放大的宽带信号可控制慢光的研究

项目编号： No.10874118

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： 詹黎

作者单位： 上海交通大学

项目金额： 40万元

中文摘要： 可控制慢光延迟作为光缓存在全光交换中具有重要的应用前景，基于光纤受激布里渊散射（SBS）的慢光是当前最有可能成为实用光缓存的技术方案。项目实施过程中，实现了高增益短光纤布里渊放大的宽带信号慢光延迟，单级放大延迟可以达到52ns。并避免自发辐射噪声对泵浦功率的抽空效应，最终提高非饱和增益而实现大延迟量，降低噪声指数。利用光纤环FP腔的滤效应减少自发噪声积累，并提高腔内功率，极大地提高了信号光的快光效应，也即提高可控制延迟量。最后系统优化了宽带信号的慢光传输系统的性能，得出利用双级快慢光效应补偿减小脉冲展宽对脉冲畸变的影响，实现宽带信号的低信号畸变的可控制慢光延迟。另外，还提出并证实了基于有源光纤布拉格光栅和有源光纤中交叉增益调制的可控制慢光技术，具有结构简单，调控方便、宽带响应的优点。本项目的研究系统证实了SBS可控制慢光缓存的科学性和实用性，对全光交换中的全光缓存实现具有科学价值。在Phys. Rev. Lett., Opt. Lett., Opt. Express等专业顶级学术刊物上发表论文19篇。

中文关键词： 慢光；受激布里渊散射；光纤；光缓存；光通信

英文摘要： The controllable slow-light delay has potential application as optical buffer in all-optical exchange. The slow-light based on stimulated Brillouin scattering (SBS) in optical fiber has been considered the most successful candidate to be practical optical buffers. This project has been foucused on the study of the slow-light delay for broadband signal using high-gain SBS amplification in short fibers. The short fiber may avoid the limit of spontaneous Brillouin noise on depleting the pump power. The delay of 52ns have been observed in the single stage Brillouin amplification. In addition, it improved the non-saturated gain and results in a large time delay, and finally reduces the noise figure. The strong wavelength dependence at the FP resonant frequency may also enhance the dispersion slope, and thus enahnce the delay time. We apply fiber ring FP cavity to to enahnce the Brillouin fast light. Finally, we demosntrated that the fast light to compensate the signal distortion in slow light systems for broadband signal, which also obtain the larger delay to improve the delayed signal quality, and to reduce the limit of pulse broadening on delay time. Besides, we also the contrallable slow light systems based on active fiber Bragg gratings and the cross gain modulation in active fibers. These schemes performs the adavantages of simple constracture, easily controlling, and boardband responsing. The studies of this project have demonstrate the scientificity and practicability of this controllable slow-light buffer for broadband signals. Under the support of this project, there are 19 papers have been publised on the top journals including Phys. Rev. Lett., Opt. Lett., Opt. Express.

英文关键词： slow light; stimulated Brillouin scattering; optical fiber; optical buffer; optical communication