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Strain-based tunable optical microresonator with an in-fiber rectangular air bubble

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Abstract

We demonstrate a strain-based fully tunable, near-lossless, whispering gallery mode (WGM) resonator made of an in-fiber rectangular air bubble, which is fabricated by splicing two segments of standard single-mode fibers. Such a resonator, with a 39 μm order radius and 1 μm order wall thickness, contributes to a high quality factor exceeding 106. The tuning in resonant wavelength is achieved by applying tensile strain to the resonator, and the voltage-tuning rate of the WGM resonance peaks is about 31.96 pm/V (strain-tuning rate 14.12pm/μϵ), and the corresponding tuning accuracy is better than 0.03 pm. Since the tensile strain applied on the resonator can reach 1000μϵ, the achievable total tunable bandwidth of 14.12nm is more than two times that of its azimuthal free spectral range.

© 2018 Optical Society of America

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