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A novel ring-based optical guided-wave resonator is proposed. The resonator has a free spectral range double that of a double-coupler ring resonator (DCRR) with the same radius of curvature. Moreover, it features higher transmission at resonance and better extinction ratio than a DCRR with the same values of finesse and waveguide propagation loss.
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Barbarossa et al. (1994) studied this question.
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