谐振腔品质因数增强技术的研究

Research on enhancement technique of resonator quality factor

光纤谐振腔是谐振式光纤陀螺系统的核心单元,其品质因数直接影响陀螺的极限灵敏度。因受限于光在谐振腔内的损耗,其品质因数常常被制约。为解决这个问题,提出了利用掺铒光纤和980nm激光器实现对光在谐振腔内损耗的补偿。通过1∶9和1∶99耦合器制作了两个直径为10cm的谐振腔,实验测试结果显示在分光比为1∶99的耦合器下得到了最高品质因数为1.09×109的光纤谐振腔。相比于加入掺铒光纤之前的谐振腔,品质因数提高了7.4倍。

The fiber resonant resonator is a key device of resonant fiber optical gyro（RFOG） system,whose Q-factor influences the limited sensitivity of RFOG.Because of loss of the light in resonator,it is difficult to improve the Q-factor of resonator.To solve this problem,a compensation method is proposed by using erbium doped fiber and 980 nm laser for compensating the loss of light in resonator.Two resonant resonator with a diameter of 10 cm are fabricated by the couplers of coupling ratio of 1：9 and 1：99.The performances of the fabricated resonator with the coupling ratio of 1：99 are measured and the experimental Q-factor of 1.09 ×10^9.Compared with the resonator without the erbium doped fiber,the Q-factor of the proposed device is increased by 7.4 times.