• Photonics Research
  • Vol. 4, Issue 5, 0191 (2016)
Song Zhu, Yang Liu, Lei Shi*, Xinbiao Xu, and Xinliang Zhang
Author Affiliations
  • Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China
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    DOI: 10.1364/prj.4.000191 Cite this Article Set citation alerts
    Song Zhu, Yang Liu, Lei Shi, Xinbiao Xu, Xinliang Zhang, "Extinction ratio and resonant wavelength tuning using three dimensions of silica microresonators," Photonics Res. 4, 0191 (2016) Copy Citation Text show less

    Abstract

    In this paper, a multidimensional tuning method of the silica microcapillary resonator (MCR) is proposed and demonstrated whereby the extinction ratio (ER) as well as the resonant wavelength can be individually controlled. An ER tuning range of up to 17 dB and a maximum tuning sensitivity of 0.3 dB/μm are realized due to the taperedprofile of the silica optical microfiber (MF) when the MF is adjusted along its axial direction. Compared to direct tuning of the coupling gap, this method could lower the requirement for the resolution of displacement stage to micrometers. When the MF is adjusted along the axial direction of the silica microcapillary, a resonance shift of3.06 nm and maximum tuning sensitivity of 0.01 nm/μm are achieved. This method avoids the use of an applied external field to control the silica microresonators. Moreover, when air is replaced by ethanol and water in the core of the silica microcapillary, a maximum resonance shift of 5.22 nm is also achieved to further enlarge the resonancetuning range. Finally, a microbubble resonator with a higher Q factor is also fabricated to achieve an ER tuning range of 8.5 dB. Our method fully takes advantage of the unique structure of the MCR to separately and easily tune its key parameters, and may broaden its applications in optical signal processing and sensing.
    Δλ=λR·RL·ΔL.(1)

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    Em,l(r)={AJm(k0(l)n1r)(rr1)BJm(k0(l)n2r)+CHm(1)(k0(l)n2r)(r1<rr2)DHm(1)(k0(l)n3r)(r>r2),(2)

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    Δλ=λneff·neffncore·Δncore,(3)

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    Song Zhu, Yang Liu, Lei Shi, Xinbiao Xu, Xinliang Zhang, "Extinction ratio and resonant wavelength tuning using three dimensions of silica microresonators," Photonics Res. 4, 0191 (2016)
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