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JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
卷 30, 期 2, 页码 377-381出版社
OPTICAL SOC AMER
DOI: 10.1364/JOSAB.30.000377
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We analyze how the evanescent coupling, kappa(e), between the outermost resonators and input/output waveguides of an N-resonator coupled resonator optical waveguide (CROW) gyroscope affects the transmission and sensitivity to rotations. For constant coupling between resonators kappa, rotation sensitivities increase as both kappa(e) -> 0 and kappa(e) -> 1 while between these two limits the sensitivity has a minimum. In the weak coupling regime, kappa(e) -> 0, the sensitivity is enhanced by Fabry-Perot oscillations due to the impedance mismatch at the input/output waveguide-CROW interface, while in the strong coupling regime, kappa(e) -> 1, the sensitivity is reduced because the outermost resonators no longer contribute to the CROW transmission. For small N the sensitivity is proportional to N-2, while at larger N the sensitivity begins to decrease due to resonator losses. (C) 2013 Optical Society of America
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