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

Optics Letters
Shen LiuYiping Wang

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 ∼14.12  pm/μϵ), and the corresponding tuning accuracy is better than 0.03 pm. Since the tensile strain applied on the resonator can reach 1000  μϵ, the achievable total tunable bandwidth of ∼14.12  nm is more than two times that of its azimuthal free spectral range.

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Citations

Jul 7, 2020·Optics Letters·Haoye QinMing Ding
Mar 7, 2020·Light, Science & Applications·Xuefeng Jiang, Lan Yang
Dec 10, 2020·Sensors·David Pallarés-AldeiturriagaJosé Miguel López-Higuera
Feb 24, 2021·Light, Science & Applications·Xuefeng Jiang, Lan Yang

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