光纤环形谐振腔作为谐振式陀螺的关键部件,其对频率的敏感程度决定了陀螺的性能。空芯光子晶体光纤作为一种新型光纤可以有效地抑制谐振式陀螺中的各种光学噪声,具有广阔的应用前景。采用光叠加法对空芯光子晶体光纤谐振腔各参数对谐振腔的Q值、陀螺灵敏度的影响进行了仿真。通过计算分析表明,当耦合器插入损耗为0.04,激光器线宽为60 kHz,光纤长度为10 m时,存在一个最佳耦合系数0.123,使得陀螺灵敏度最小值为0.572 5°/h。

As the key element of R-FOG,the sensitivity of fiber ring resonator(FRR) to frequency determines a gyroscope’s performance.Air core photonic-bandgap fiber(PBG-PCF) is a new type of fiber,which can inhibit optic noise in a certain extent and has potentially broad application in the future.The effects of various FRR parameters on FRR’s Q,the sensitivity of R-FOG was simulated with optical superposition method.The calculation and analysis indicated that,when insert loss of coupler is 0.04,linewidth of laser is 60 kHz and length of fiber is 10 m,There is an optimum coupling coefficient 0.123,which leads sensitivity of gyroscope is 0.572 5°/h.