The response of fiber grating FP cavity to different frequency pulse injection is theoretically studied and experimentally demonstrated. The fiber grating FP cavity is composed of a pair of identical uniform fiber Bragg gratings connected by a piece of fiber, and the ring-down spectral characteristics of the fiber grating FP cavity with different frequency pulse laser injection are studied. The results show that the ring-down time of the fiber grating FP cavity is independent of the frequency of the pulsed laser, and the time that the intensity of the light in the fiber grating FP cavity reaches the maximum value is related to the frequency of the pulsed laser. If the frequency of the pulsed laser is too high, the stability of the light intensity in the cavity will be affected, which results in the measurement error of the cavity ring-down time.

理论研究了光纤光栅FP腔对不同频率脉冲注入的响应。光纤光栅FP腔由一对相同的均匀的光纤布拉格光栅通过一条光纤连接而成，研究了不同频率脉冲激光注入的光纤光栅FP腔的衰荡光谱特性。结果表明，光纤光栅FP腔的衰荡时间与脉冲激光的频率无关，光纤光栅FP腔中的光强达到最大值的时间与激光的频率有关。脉冲激光。如果脉冲激光的频率太高，将会影响腔体内光强度的稳定性，从而导致腔衰荡时间的测量误差。