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

Shen Liu, Zhongyuan Sun, Lin Zhang, Cailing Fu, Yu Liu, Changrui Liao, Jun He, Zhiyong Bai, Ying Wang, Yiping Wang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Pages (from-to)4077-4080
Number of pages4
JournalOptics Letters
Issue number17
Early online date26 Jul 2018
Publication statusPublished - 16 Aug 2018

Bibliographical note

This paper was published in Optics Letters and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.


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