Abstract

We propose, model, and demonstrate a sensing method based on monitoring changes in the resonances' dip depth of optical resonators as a response to induced optical losses. Specifically, we present a γ dosimeter based on a Phosphorus-doped fiber ring resonator, suffering strong optical losses by the radiation. We study, theoretically and experimentally, the effect of induced optical losses on the resonator's coupling regime, and explore possible working points for such a sensor. We show that the recommended working point for maximizing the responsivity to induced losses, is the strong over-coupling regime. In addition, we show increase in sensitivity with increasing Q factor. We show that the suggested resonator-based sensing approach may provide higher sensitivity for ionizing radiation sensing, than the more common single-path Radiation-Induced Attenuation (RIA) approach even with a length equivalent to the effective length of the resonator. Furthermore, it may be incorporated in systems where the optical path length is limited.