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为满足惯性制导对高精度、高稳定度陀螺仪的需求,进行了对基于高色散谐振环结构的光纤陀螺原理研究。在一些高色散耦合谐振环结构中,其色散性质使其系统传递函数对相位微扰十分敏感,可以对萨格纳克相移起到放大作用,从而大大提高传感灵敏度。理论与仿真研究结果表明:多点耦合内切谐振环慢光结构系统能够同时满足实现高灵敏度转动传感所要求的“方向性条件”和“高群折射率(慢光)”两个基本条件,且具有进一步使群折射率比传统结构高出几个数量级的潜力。同时,由于该结构系统可使用定向耦合器来方便搭建,具有用来制作低成本、高灵敏度的光纤陀螺的潜力。
In order to meet the demand of inertial guidance for high-precision and high-stability gyroscope, the principle of fiber optic gyroscope based on high-dispersion resonant ring structure is studied. In some highly chromatic dispersion coupled resonant ring structures, the dispersion property makes the system transfer function very sensitive to phase perturbation, which can amplify the Sagnac’s phase shift and greatly improve the sensing sensitivity. The theoretical and simulation results show that the multi-point coupled resonant cavity slow-light structure system can meet both the “directivity condition” and the “high group index (slow light)” required for high-sensitivity rotational sensing Two basic conditions, and has the potential to further make the group refractive index several orders of magnitude higher than traditional structures. In the meantime, since the structural system can be easily constructed using a directional coupler, it has the potential to be used to make a low-cost, high-sensitivity fiber optic gyroscope.