We theoretically and experimentally study an add-drop ring resonator to achieve tunable Fano resonance. In this system, the Fano resonance results from the interference of two beams from add and through port. The line shapes of the Fano resonances are tunable through controlling the phase bias of the two beams from add and through port. At the same time, add-drop ring resonator structure enabling the truly on/off switching mechanism is realized when the phase bias is 0 or π. The experimental results well agree with the theoretical calculation.

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Yundong Zhang, Yongfeng Wu, Hui Li, Changqiu Yu, and Ping Yuan, "Tunable Fano resonance based on add-drop ring resonator structure," Proc. SPIE 9949, Polymer Optics and Molded Glass Optics: Design, Fabrication, and Materials 2016, 994902 (Presented at SPIE Optical Engineering + Applications: August 29, 2016; Published: 27 September 2016); https://doi.org/10.1117/12.2237235.