An add-drop ring resonator interferometer sensor with high sensitivity

We propose an add-drop ring resonator interferometer with high sensitivity. We theoretically demonstrate this add-drop ring resonator configuration with a compact size enables the simultaneously producing fast light and slow light. We also theoretically calculate the sensitivity of the add-drop ring resonator interferometer as a sensing system. The sensitivity of our configuration can achieve 13.48/rad, which is enhanced by 6.46/rad compared to that of the traditional single-bus ring resonator which is 7.02/rad. This proposed structure enables highly sensitive, compact and stable sensors.