We achieve Fano-like resonances in an all-in-fiber structure embedded with an in-line Mach-Zehnder interferometer (MZI). A fiber Bragg grating is inserted into MZI’s one arm to form a resonance, which functions as the discrete state of the Fano-like resonance to couple with the continuum propagating mode of MZI in the fiber core. A theoretical model predicts the controllable resonance lineshape by changing the phase difference between the MZI’s two interference pathways. Fano-like resonances with an extinction ratio over 20 dB are experimentally observed, which are reliably tuned into Lorentzian and electromagnetically induced transparency-like resonances by versatile methods. The realization of Fano-like resonances with broad tunability in this all-in-fiber structure holds potentials in fiber-based applications of sensing, signal processing and nonlinear optics.
CITATION STYLE
Jiang, B., Gan, X., Gu, L., Hao, Z., Wang, S., Bi, Z., … Zhao, J. (2019). Fano-like resonance in an all-in-fiber structure. IEEE Photonics Journal, 11(5). https://doi.org/10.1109/JPHOT.2019.2936485
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