基于手征光纤的全光纤圆偏振器件的研究与制备

项目名称： 基于手征光纤的全光纤圆偏振器件的研究与制备

项目编号： No.61205028

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 信息四处

项目作者： 苏觉

作者单位： 中国科学技术大学

项目金额： 25万元

中文摘要： 圆偏振光具有不必对光轴、反射光与入射光偏振态正交、易于检测法拉第效应等良好性能，已引起国内外专家的广泛关注。但尚无成熟光纤圆偏振产品，而且圆偏振光在光纤中的起偏一般用从线偏振光转换成圆偏振光的间接起偏方法。为使光纤圆偏振技术得到长足的发展，扩大其应用前景，如何简便有效地设计和制作全光纤圆偏振器件是其中的难点和关键。为解决这个问题，本项目提出在熔融状态下扭转线保偏光纤形成手征光纤光栅（CFG）进行设计和制作全光纤圆偏振器件的方法。首先研究新型CFG中模式的耦合机理，建立一套设计新型CFG元件的方法或软件；然后制作一台新型CFG制作设备；最后利用CFG制作光纤圆偏振起偏器、圆偏振滤波器、单圆偏振光纤等全光纤器件。不仅可用于光纤电流传感等测试系统，而且凡是线偏振光应用的场合如高精度光纤激光陀螺都有圆偏振光潜在用武之地。此将为圆偏振技术在光纤传感和相干光通信中得到发展而做出贡献。

中文关键词： 光纤偏振技术；圆偏振；耦合模理论；手征光纤光栅；

英文摘要： There are some advantages of circularly polarized light over linearly polarized light such as no need to aim the optical axis when connecting different fibers, the polarization states of the reflected light and incident light are orthogonal, easy to detect the Faraday Effect and so on. So it had attracted extensive attention from domestic and foreign experts. But there is no mature product of all fiber circular polarizer. In general terms a circularly polarized light can be only transformed from linearly polarized light that is generated by a linear polarizer. How should we develop the fiber circular polarization technology by leaps and bounds and expand its application prospects? The nodus and key is how to design and product all fiber circular polarized devices by a simple and effective method. To deal with this challenging and attractive problem, a new method of designing and producting the devices based on chiral fiber grating (CFG) which was generated through twisting the linear polarization fiber is proposed. First，to study the mode coupling mechanism of the new CFG and build a modus or software of design of the new CFG devices; then to manufacture a equipment of the new CFG; finally using the CFG to fabricate all fiber circularly polarized devices such as optical fiber circular polarizer, circularly polar

英文关键词： Optical Fiber Polarization Technology；Circularly Polarization；Coupled-mode Theory；Chiral Fiber Grating；