光学微腔由于其场增强效应，在微纳传感领域具有极高的应用前景。然 而，因为谐振的存在，其对时域调制的响应并非完全平坦，这对后续的应用 带来了一定的困难。为深入理解光学微腔的时域传输特性，进一步优化其在 高速、高灵敏度传感领域的应用场景，本文从耦合模方程引入，以 F-P 腔为 例，通过理论推导，采用傅里叶变换处理入射波并结合耦合腔理论等内容进 行研究，得到传输谱、出射频谱与入射波的关系式。并给出一些常用波形入 射时的传输谱和频谱图像。又从光学角度考虑整个过程，计算输出形式并将 结果与运用耦合模方程推导所得的结果相对比，考虑微腔条件下两者的近似 情况。

Optical microcavity has a very high application prospect in micro/nano sensing field because of its field enhancement effect. However, due to the existence of resonance, its response to time-domain modulation is not completely flat, which brings some difficulties to subsequent applications. In order to deeply understand the time-domain transmission characteristics of optical microcavity and further optimize its application scenario in the field of high-speed and highsensitivity sensing ,we will introduce the coupled-mode equations first and then taking F - P cavity as an example. Through theoretical derivation, we use the Fourier transform to deal with the incident wave and then get the transmission spectrum, the output spectrum, and the relation between the incident wave by combining the theory of coupled cavity and other contents. The transmission spectra and spectral images of some common waveforms are given. Considering the whole process from the optical point of view, the output form is calculated and the result is compared with the result derived by using the coupling mode equation. Considering the approximate situation of the two under the condition of micro cavity.