Second order add/drop filter with a single ring resonator

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    Abstract

    We show theoretically and experimentally how a flat-top second-order response can be achieved with a self-coupled single add-drop ring resonator based on two couplers with different splitting ratios. The resulting device is a 1x1 filter, reflecting light back in the input waveguide at resonating wavelengths in the passbands, and transmitting light in the output waveguide at all other non-resonating wavelengths. Different implementations of the filter have been designed and fabricated on a micron-scale silicon photonics platform. They are based on compact Euler bends - either U-bends or Lbends - and Multi-Mode Interferometers as splitters for the ring resonators. Different finesse values have been achieved by using either 50:50 MMIs in conjunction with 85:15 MMIs or 85:15 MMIs in conjunction with 95:05 double MMIs. Unlike ordinary lowest order directional couplers, the MMIs couple most of the power in the cross-port which make them particularly suitable for the topology of the self-coupled ring, which would otherwise require a waveguide crossing. Experimental results are presented, showing good agreement with simulations. The proposed devices can find applications as wavelength-selective reflectors for relatively broad-band lasers or used as 2x2 add-drop filters when two exact replicas of the device are placed on the arms of a Mach-Zehnder interferometer.
    Original languageEnglish
    Title of host publicationSilicon Photonics XII
    EditorsAndrew P. Knights, Graham T. Reed
    PublisherInternational Society for Optics and Photonics SPIE
    ISBN (Electronic)9781510606579
    ISBN (Print)978-1-5106-0657-9
    DOIs
    Publication statusPublished - 1 Jan 2017
    MoE publication typeA4 Article in a conference publication
    EventSilicon Photonics XII: SPIE OPTO 2017 - San Francisco, United States
    Duration: 30 Jan 20171 Feb 2017

    Publication series

    SeriesProceedings of SPIE
    Volume10108
    ISSN0277-786X

    Conference

    ConferenceSilicon Photonics XII
    CountryUnited States
    CitySan Francisco
    Period30/01/171/02/17

    Keywords

    • flat-top filters
    • integrated optics
    • multimode interference splitters
    • photonic integrated circuits
    • ring resonators
    • silicon photonics
    • WDM filters
    • Integrated optics
    • OtaNano

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  • Cite this

    Cherchi, M., Sun, F., Kapulainen, M., Vehmas, T., Harjanne, M., & Aalto, T. (2017). Second order add/drop filter with a single ring resonator. In A. P. Knights, & G. T. Reed (Eds.), Silicon Photonics XII [101080B] International Society for Optics and Photonics SPIE. Proceedings of SPIE, Vol.. 10108 https://doi.org/10.1117/12.2252146