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In-fiber Mach–Zehnder interferometer and sphere whispering gallery mode resonator coupling structure

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Abstract

An in-fiber Mach–Zehnder interferometer and sphere whispering gallery mode resonator coupling structure is demonstrated by femtosecond laser micromachining. Asymmetric spectra around the resonant wavelength of the whispering gallery cavities in different coupling states are experimentally observed. An extinction ratio of 7dB and a slope of 117 dB/nm can be achieved in the asymmetric spectrum of the overcoupled whispering gallery cavity, where an additional π phase shift at the resonant wavelength is introduced to the Mach–Zehnder interferometer.

© 2016 Optical Society of America

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