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Second-order filtering and sensing with partially coupled traveling waves in a single resonator

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Abstract

The counterpropagating waves in a single traveling-wave cavity can be partially coupled by means of a small perturbation such as a notch. When it is side coupled to a waveguide, this single cavity yields a general second-order (Chebyshev) reflection response in the waveguide, which is useful for narrow-bandwidth reflecting applications. In a different application, the cavity amplifies small reflections induced by external perturbations, thus finding use in ultrafine sensing. Amplification factors as great as 1012 are predicted for the highest-Q microsphere resonators. The analytic theory of these devices is presented.

© 1998 Optical Society of America

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