可调谐的低阈值拉曼分布式反馈（DFB）脉冲光纤激光器研究

项目名称： 可调谐的低阈值拉曼分布式反馈（DFB）脉冲光纤激光器研究

项目编号： No.61307055

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 无线电电子学、电信技术

项目作者： 施进丹

作者单位： 北京邮电大学

项目金额： 26万元

中文摘要： 基于拉曼增益的分布式反馈（DFB）光纤激光器不仅具有光纤兼容性好、体积小、成本低、大功率输出、宽可连续调谐、低噪和窄线宽等优点，而且可以实现任意波长的输出。它在长距离相干通信、光纤传感和激光雷达等领域具有非常广泛的应用前景。为了克服目前拉曼DFB光纤激光器的阈值较高和不可调谐等关键技术问题，项目提出研究波长可连续调谐、低阈值且脉冲型拉曼DFB光纤激光器的基础理论、设计方法及关键技术。重点研制具有超高Q值且较长有效腔结构的非均匀相移的DFB光纤光栅，利用脉冲泵浦源，理论和实验实现可连续调谐、低阈值（<100 mW）且大功率输出（输出峰值功率 >10 W）的拉曼DFB脉冲光纤激光器。该研究成果对推动拉曼DFB光纤激光器的实用化进程将起到关键的重要作用，且为我国具有自主知识产权光纤激光器及传感的发展做出贡献。

中文关键词： DFB光纤激光器；四波混频；锁模光纤激光器；可调谐；超连续谱

英文摘要： A Raman gain-based distributed-feedback(R-DFB) fiber laser not only possesses the features of fiber compatibility, compact, low cost,high power output, broad-band continuously tunability, low noise and narrow-linewidth, but also it can be generated at any wavelength ranging from visible to infared. These attractive characteristics have let to R-DFB fiber lasers finding a number of applications in the areas of long-distance coherence telecommunications, fiber sensing and Light Detection and Ranging（LIDAR）. In order to overcome the main issues of the current R-DFB fiber lasers of high lasing threshold power and non-tunability, here, we propose to investigate the fundamental principle,cavity design and key techniques of continuously tunable, low threshold and pulsed R-DFB fiber lasers. We focus on designing a creative phase-shifted non-uniform DFB fiber cavity, which has ultra-high Q-factor and long effective cavity length. By employing a pulsed fiber laser as the pump source, we aim to both numerically and experimentally demonstrate a continuously tunable, low threshold pump power (<100 mW) and high output peak power (>10 W) R-DFB fiber laser. This research plays a key role in promoting the practical process of the R-DFB fiber lasers and we strive to contribute to the development of fiber lasers and sensing with

英文关键词： DFB fiber lasers；four-wave mixing；mode-locked fiber lasers；tunable；superconntiuum