All-Pass and Add-Drop Microsphere Resonator in a Suspended Dual-Core Hollow Fiber

Yang, Lei; Zhang, Xiaobei; Yang, Yong; Hou, Fengyu; Sun, Wei; Sun, Hong‐Bo; Yu, Qianqing; Wang, Tingyun

doi:10.1109/lpt.2020.2986549

Cited by 6 publications

(5 citation statements)

References 16 publications

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“…Moreover, the in-fiber resonator can work as a convenient sensing probe due to its reflection mode operation. Heretofore, it has been used in the sensing of temperature [ 50 , 53 ], humidity [ 84 ], hydrostatic pressure [ 78 ], refractive index [ 39 ], chemical vapor [ 81 ], biomolecule identity [ 28 , 85 ], etc. The sensing functions are realized by monitoring the change of WGM resonance.…”

Section: Discussionmentioning

confidence: 99%

“…The sensing functions are realized by monitoring the change of WGM resonance. Furthermore, the spectral peak or dip of WGM resonance makes in-fiber resonator capable of optical filtering [ 39 ], where the peak and dip are found in the operation mode of reflection and transmission, respectively. Meanwhile, the WGM peak can also be regarded as a narrow-band wavelength-selective reflector [ 57 ].…”

Section: Discussionmentioning

confidence: 99%

“…Furthermore, when the solid microsphere inside capillary is replaced by a HGM, the two-beam interference can be realized [ 78 ]. Besides the capillary, micro-structure hollow fibers can be also employed to construct in-fiber couplers, including the HACF [ 50 ], SDCHF [ 39 ] and EDCHF [ 37 ]. High coupling efficiencies can be achieved by optimizing the cone-apex angle of coupler.…”

Section: Discussionmentioning

confidence: 99%

“…In 2020, Yang et al proposed a SDCHF based in-fiber resonator consisting of SMF, SDCHF, and a barium titanate glass microsphere, as shown in Fig. 26 a [ 39 ]. The SDCHF comprises a cladding with diameter of 125 μm, an air hole with diameter of 83.5 μm, and two suspended cores with distance D c of 63.5 μm.…”

Section: Micro-structure Hollow Fiber Based In-fiber Couplermentioning

confidence: 99%

“…For microspheres, either passive or active ones with diameter slightly smaller than that of the fiber can be adopted. Passive microspheres made of polymethyl methacrylate (PMMA), polymer, borosilicate, Ba-Ti oxide, polystyrene, silica, barium titanate, and so on, can be embedded into the mentioned optical fibers to construct in-fiber resonators, and have been successfully applied in applications including temperature [ 37 ], refractive index [ 39 ], and displacement sensing [ 40 ]. Besides, dye and rare-earth ion can be doped into the microsphere material, thereby emitting fluorescence [ 41 – 45 ].…”

Section: Introductionmentioning

confidence: 99%

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Recent progress of in-fiber WGM microsphere resonator

Yang

Zhang

2023

Front. Optoelectron.

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In-fiber whispering gallery mode (WGM) microsphere resonators have received remarkable attention due to the superiorities of compact structure, high stability and self-alignment. As an in-fiber structure, WGM microsphere resonators have been demonstrated in various applications, such as sensors, filters and lasers, which have significant impacts on modern optics. Herein, we review recent progress of in-fiber WGM microsphere resonators, which involve fibers of diverse structures and microspheres of different materials. First, a brief introduction is given to in-fiber WGM microsphere resonators, from structures to applications. Then, we focus on recent progresses in this field, including in-fiber couplers based on conventional fibers, capillaries and micro-structure hollow fibers, and passive/active microspheres. Finally, future developments of the in-fiber WGM microsphere resonators are envisioned. Graphical Abstract

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