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. 2. The timeline on Fano resonance in fiber-optic structures illustrates a significant increase in the annual number of articles published between 2005 and 2025.
Fig
. 3. Optical fiber structures that enable a Fano-like spectrum: a) a microbubble coupled to a taper fiber [ 22 ], b) a Bragg grating etalon-based optical fiber [ 52 ], c) a microsphere coupled to a taper fiber as a whispering-gallery resonators [ 14 ].
enhanced Fano resonance in a non-adiabatic tapered fiber coupled with a microresonator, demonstrating its potential for high-sensitivity optical sensing and laser stabilization.
In 2018, Pant et al. [ 32 ] reported wideband excitation of Fano resonances and induced transparency through coherent interactions between multiple Brillouin resonances, revealing a new mechanism for controlling light – sound interactions in optical fibers. In the same year, Zhang et al. [ 33 ] proposed an in-line fiber Michelson interferometer designed to enhance the Q-factor of cone-shaped in-wall capillary – coupled resonators, providing improved mode confinement and sharper resonance features.
In 2019, Jiang et al. [ 34 ] demonstrated Fano-like resonance in an all-fiber structure, achieving high spectral asymmetry and tunability through precise control of fiber coupling conditions. Lu et al. [ 35 ] reported tunable oscillating Fano spectra in a fiber taper – coupled conical microresonator, showing dynamic control of resonance profiles by adjusting the coupling gap and taper diameter. Wang et al. [ 36 ] proposed an ultranarrow optical filter based on Fano resonance in a single cylindrical microresonator, enabling single-longitudinal-mode operation in fiber lasers with high spectral purity. Tsai et al. [ 37 ] simulated a numerically method to minimize Fresnel reflections with an inscribed FBG at the fiber tip.
In 2020, Li et al. [ 38 ] introduced a continuously tunable fiber laser based on a Fano resonance filter using a thin fiber taper – coupled conical microresonator. This configuration allowed stable single-mode lasing and continuous wavelength tuning, demonstrating the potential of Fano-resonant devices for narrow-linewidth laser design and precision optical sensing.
In 2021, Li et al. [ 39 ] realized and modulated Fano-like lineshapes in fiber Bragg gratings, providing new insight