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  • Received: Sep. 13, 2018

    Accepted: Nov. 29, 2018

    Posted: Feb. 19, 2019

    Published Online: Feb. 19, 2019

    The Author Email: Qixiang Cheng (

    DOI: 10.1364/PRJ.7.000155

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    Qixiang Cheng, Liang Yuan Dai, Nathan C. Abrams, Yu-Han Hung, Padraic E. Morrissey, Madeleine Glick, Peter O’Brien, Keren Bergman. Ultralow-crosstalk, strictly non-blocking microring-based optical switch[J]. Photonics Research, 2019, 7(2): 02000155

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Photonics Research, Vol. 7, Issue 2, 02000155 (2019)

Ultralow-crosstalk, strictly non-blocking microring-based optical switch

Qixiang Cheng1,*, Liang Yuan Dai1, Nathan C. Abrams1, Yu-Han Hung1, Padraic E. Morrissey2, Madeleine Glick1, Peter O’Brien2, and Keren Bergman1

Author Affiliations

  • 1Department of Electrical Engineering, Columbia University, New York, New York 10027, USA
  • 2Tyndall National Institute, University College Cork, Cork, Ireland


We report on the first monolithically integrated microring-based optical switch in the switch-and-select architecture. The switch fabric delivers strictly non-blocking connectivity while completely canceling the first-order crosstalk. The 4×4 switching circuit consists of eight silicon microring-based spatial (de-)multiplexers interconnected by a Si/SiN dual-layer crossing-free central shuffle. Analysis of the on-state and off-state power transfer functions reveals the extinction ratios of individual ring resonators exceeding 25 dB, leading to switch crosstalk suppression of up to over 50 dB in the switch-and-select topology. Optical paths are assessed, showing losses as low as 0.1 dB per off-resonance ring and 0.5 dB per on-resonance ring. Photonic switching is actuated with integrated micro-heaters to give an 24 GHz passband. The fully packaged device is flip-chip bonded onto a printed circuit board breakout board with a UV-curved fiber array.

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