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International Workshop on Nonlinear Photonics (NLP)

Nonlinear Mach-Zehnder-Fano interferometer

Andrey E. Miroshnichenko, Yi Xu

Published Sep 1, 2011• 0 citations
Publisher

Abstract

We consider nonlinear Mach-Zehnder-Fano interferometer in which supports the nonlinear Fano resonances. Based on the introduced figure of merit, we demonstrate that the nonlinear Mach-Zehnder-Fano interferometer could enhance the nonlinear response up to two orders of magnitude and produce the nearly perfect dynamical bistable response compared to standard Fano resonance geometry. The enhanced resonance excitation in the nonlinear Fano defect and the step-function like linear transmission suggest that the Mach-Zehnder-Fano interferometer could be a suitable candidate involving in nonlinear manipulation of the Fano resonance. We confirm the significant enhancement of the nonlinear sensitivity both in stationary and dynamic manners. We further suggest a nonlinear photonic crystal circuit as one of the possibilities to realize our results.

DOI
10.1109/nlp.2011.6102666

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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.
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