When radiation propagates in an optical ring resonator, apart from the main peaks, additional peaks are observed. It is known that the strain of optical fiber induces birefringence. Assuming that an additional peak is associated with the main peak, we proposed a model describing the relative position of the main and additional resonance peaks. The model predicts induced birefringence based on the frequency difference between the main and additional peaks. For experimental verification, we fabricated an optical ring resonator, measured the difference between the main and additional peaks and obtained the birefringence value. This value was –(3.42 ± 0.51)·10−7, consistent with values obtained in other studies.

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