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 ${10}^6$. 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 $\sim 14.12\mathrm{pm}/\mathrm{\mu ϵ}$), and the corresponding tuning accuracy is better than 0.03 pm. Since the tensile strain applied on the resonator can reach $1000\mathrm{\mu ϵ}$, the achievable total tunable bandwidth of $\sim 14.12\mathrm{nm}$ is more than two times that of its azimuthal free spectral range.

© 2018 Optical Society of America

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