Fig. 1. The coupling resonance of fiber wedge end face and micro-tubular cavity

Fig. 2. Optical field distribution and coupled resonance states of wedge-terminated fibers with different throw angles θ

Fig. 3. (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

Fig. 4. Simulation of WGM coupled resonant spectrum.（a） Monitor1； （b） Monitor2

Fig. 5. Simulation of WGM coupled resonant transmission spectrum

Fig. 6. Diagram of wedge fiber under microscope

Fig. 7. Coupling resonance experimental test system

Fig. 8. (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

Fig. 9. Resonance spectra of different coupling distances

Fig. 10. The local amplification diagram of WGM resonant transmission spectrum