光纤旋转连接的温度和插入损耗特性研究

Research of Temperature and Insertion Loss Characteristics of Optical Fiber Rotary Connection

光纤旋转连接通常采用光纤扩束来实现旋转耦合,多芯光纤旋转连接一般采用道威棱镜来解旋,温度变化时空间光路受棱镜变化影响发生倾斜和偏离,导致插入损耗增大。针对多芯光纤旋转连接的结构和工艺,建立了光纤旋转连接温度和插入损耗的联合仿真模型,设计了热膨胀匹配光路,仿真分析了应力和形变及棱镜变形后的单模和多模光路插入损耗特性。在仿真研究的基础上,制作了6芯单模和8芯多模混装光纤旋转接头,经实测其-40~65℃温度范围内插入损耗<2.5 dB,插入损耗变化≤0.5 dB,验证了仿真模型的有效性。此研究方法对其他光器件的温度与插入损耗特性评估有指导作用。

The optical fiber rotary connection usually uses optical fiber beam expansion to achieve rotary coupling.The multi-core optical fiber rotary connection generally uses Dove prism to untwist.When the temperature changes,the optical path will tilt and deviate,resulting in increasing insertion loss.Aiming at the structure and process of the optical fiber rotary connection,a joint simulation model of the temperature and insertion loss of the optical fiber rotary connection is established.The thermal expansion matching optical path is designed,and the stress,deformation and insertion loss characteristics of single-mode optical path and multi-mode optical path of the deformed prism are simulated and analyzed.On the basis of simulation research,the 6-core single-mode and 8-core multi-mode mixed optical fiber rotary connection is produced.After actual testing,its insertion loss is less than 2.5 dB,and the change in insertion loss is not greater than 0.5 dB within the temperature range of-40~65 ℃,which verifies the effectiveness of the simulation model.The research approach is instructive for the evaluation of the temperature and insertion loss characteristics of otheroptical devices.