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26 February 2020 A widely tunable twin-fano resonator for wavelength monitor
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Proceedings Volume 11285, Silicon Photonics XV; 112851R (2020)
Event: SPIE OPTO, 2020, San Francisco, California, United States
A dual-microring resonator replaces one of the couplers of the Mach-Zehnder interferometer (MZI) to achieve a widely tunable twin-fano resonance, which originates from the interference and coupling of mode in a dual-microring resonator. The slope can be tuned in a wide range from -84.2 dB/nm to 91.0 dB/nm by metal heaters integrated on one arm of the MZI, and the resonant wavelength fixes when slope changes. The “X-type” spectrum is shown by self-alignment, which means manual alignment to form “X-type” line is unnecessary after tuning dual-microrings because the “X-type” line can be produced easily by the difference of two correlated spectrums rather than two independent spectra. Meanwhile, it shows high wavelength resolution of 1 pm with an ideal resolution of 0.4 pm in the region of the slope of 127.4 dB/nm, which can be applied to wavelength monitoring with ultra-high resolution.
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Xiaoqing Guo, Tingge Dai, Bei Chen, Hui Yu, Yuehai Wang, and Jianyi Yang "A widely tunable twin-fano resonator for wavelength monitor", Proc. SPIE 11285, Silicon Photonics XV, 112851R (26 February 2020);

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