Infrared and Laser Engineering, Volume. 52, Issue 9, 20220851(2023)

Fiber wedge end-face coupler for capillary whispering-gallery-mode resonators

Guoqing Yuan1,2,3, Hong Li1,2,3, Xinjian Luo2, Lidan Lu2, and Lianqing Zhu1,2,3
Author Affiliations
  • 1Key Laboratory of the Ministry of Education for Optoelectronic Measurement Technology and Instrument, Beijing Information Science & Technology University, Beijing 100016, China
  • 2Beijing Laboratory of Optical Fiber Sensing and System, Beijing Information Science & Technology University, Beijing 100016, China
  • 3Guangzhou Nansha Intelligent Photonic Sensing Research Institute, Beijing Information Science & Technology University, Guangzhou 511462, China
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    Figures & Tables(12)
    The coupling resonance of fiber wedge end face and micro-tubular cavity
    Optical field distribution and coupled resonance states of wedge-terminated fibers with different throw angles θ
    (a) Simulation design of coupling structure of fiber wedged end face and micro capillary tube; (b) Characteristic spectrum of Lorentz peak; (c) Characteristic spectrum of Lorentz dip
    Simulation of WGM coupled resonant spectrum.(a) Monitor1; (b) Monitor2
    Simulation of WGM coupled resonant transmission spectrum
    Diagram of wedge fiber under microscope
    Coupling resonance experimental test system
    (a) The structure position diagram of the fiber wedged end face and the micropipe cavity; (b) Microscope1 captures the main view image of the coupled structure; (c) Microscope2 captures the top view image of the coupled structure
    Resonance spectra of different coupling distances
    The local amplification diagram of WGM resonant transmission spectrum
    • Table 1. Program parameters for fabrication of fiber wedge end coupler structure

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      Table 1. Program parameters for fabrication of fiber wedge end coupler structure

      ParametersValue
      Fiber diameter/μm125
      Strip length/mm12
      Grinding methodSlope grinding
      Angle choiceAdjustable
      Grinding disc speed/r·s-130
      Ceramic ferrule Grinding time/min30
      Z axis descending speed/μm·s-12
      Fiber Grinding time/min1
    • Table 2. Comparison of different coupling methods for capillary resonance

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      Table 2. Comparison of different coupling methods for capillary resonance

      Ref.Coupling method System complexity RobustnessQ factor
      [8] PrismComplexGood6.23×103
      [10] Tapered fiberSimpleGeneral1.80×103
      [11] Tapered fiberSimpleGeneral4.40×104
      This paperWedge end faceSimpleGood6.15×103
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    Guoqing Yuan, Hong Li, Xinjian Luo, Lidan Lu, Lianqing Zhu. Fiber wedge end-face coupler for capillary whispering-gallery-mode resonators[J]. Infrared and Laser Engineering, 2023, 52(9): 20220851

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    Paper Information

    Category: Optical communication and sensing

    Received: Nov. 29, 2022

    Accepted: --

    Published Online: Oct. 23, 2023

    The Author Email:

    DOI:10.3788/IRLA20220851

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