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A compound fiber ring resonator is made with a Fabry–Perot étalon built inside a fiber ring that is fed through a 2 × 2 directional single-mode fiber coupler. It is theoretically analyzed by an unfolded equivalent model and a transfer-matrix method. The output intensities are presented, and four cases are discussed. The results may be useful in applications such as fiber spectrum analyzers, sensors, and lasers.
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Zhang et al. (1994) studied this question.
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