高精度环形谐振腔的结构设计及优化

Structure design and optimization of high fineness ring resonator

环形谐振器作为谐振式光学陀螺的核心敏感部件,其精细度的大小直接影响光纤陀螺的灵敏度,所以研究光纤环形谐振器的特性及其精细度是优化陀螺设计和制造及提高性能的关键。通过对比分析不同耦合器结构的耦合原理,系统分析了在一定激光器线宽的基础上,谐振式光学陀螺系统灵敏度和谐振腔光路中各参数的间的关系及耦合器耦合系数与各损耗参数间的关系。设计优化R-MOG系统的主要参数。最终在同时考虑到谐振腔的高精细度和高Q值得前提下,得到当腔长尺寸为21.4 cm时,精细度达170,Q值为3.34×107,此时,灵敏度为0.48(°)/h,并且,通过建立一个R-MOG闭环实验系统,对系统双路转动的闭环响应进行了测试,这为陀螺系统的构建提供了理论和实验基础。

Resonator is the core sensing element of resonant optical gyroscope, its fineness is an important parameter of gyroscope. Fineness F directly affects the size of the sensitivity of fiber﹣optic gyroscope （FOG）, so research on the characteristics of optical fiber ring resonator and its fineness is the key to optimize the design, manufacture and improve its performance. In this paper, the working principle of ring resonator was introduced in detail, including the coupling principle of the coupler structure and the transmission mode of light in resonator. Each influenced parameters of sensitivity and some parameters between coupling coefficient and loss were analyzed. Finally by considering the resonator of high precision and high Q, when the cavity size is 21.4 cm, the fineness can reach 170, the Q value can reach 3.34＆#215;107, and at this point, the sensitivity is 0.48 （＆#176;）/h. Moreover, the R- MOG closed loop experiment system was established and closed﹣loop response of a two﹣way rotation system was tested, which provides theoretical and experimental basis for the construction of gyro system.