光纤环形谐振腔Q值与谐振深度优化研究

Research on optical fiber ring resonator Q value and resonant depth optimization

高Q值、高谐振深度的光纤环形谐振腔影响着以其为核心敏感元件的光学检测系统精度。为了提升谐振腔Q值和谐振深度,理论分析了腔长、分光比和腔内损耗对两者的影响。分别使用5种分光比的耦合器搭配5种长度的光纤制作了谐振腔并进行测试。结果表明:Q值与腔长呈正相关,与分光比呈负相关;谐振深度和分光比与腔内损耗之间的匹配程度呈正相关。实验中得到了Q值超过1×10~8、谐振深度超过85%的谐振腔。

The optical fiber ring resonator with high Q value and high resonant depth affect the detection pre- cision of the optical detection system with the resonator as core of sensitive component. In order to improve Q value and resonant depth, this paper analyzes the effect of length, coupling ratio and loss of the fiber resonator theoretically. It fabricates the resonators fabricated with five coupling ratios of the couplers and five lengths fiber respectively and carries out the test. The result shows that the Q value is positively related with the length and negatively related with the coupling ratio respectively; the resonant depth is positively related with match- ing degree between coupling ratio and loss of the fiber ring resonator. The experiment obtains the resonator with Q value over 1 × 10^8 and the resonant depth over 85% in the experiment.