Second order add/drop filter with a single ring resonator

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    1 Citation (Scopus)

    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

    Fingerprint

    Ring Resonator
    Waveguide
    Resonators
    Waveguides
    resonators
    Coupler
    Wavelength
    Filter
    waveguides
    filters
    rings
    U bends
    wavelengths
    Silicon Photonics
    Mach-Zehnder Interferometer
    Mach-Zehnder interferometers
    Directional couplers
    Optical filters
    directional couplers
    Reflector

    Keywords

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

    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
    Cherchi, Matteo ; Sun, Fei ; Kapulainen, Markku ; Vehmas, Tapani ; Harjanne, Mikko ; Aalto, Timo. / Second order add/drop filter with a single ring resonator. Silicon Photonics XII. editor / Andrew P. Knights ; Graham T. Reed. International Society for Optics and Photonics SPIE, 2017. (Proceedings of SPIE, Vol. 10108).
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    title = "Second order add/drop filter with a single ring resonator",
    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.",
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    author = "Matteo Cherchi and Fei Sun and Markku Kapulainen and Tapani Vehmas and Mikko Harjanne and Timo Aalto",
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    Cherchi, M, Sun, F, Kapulainen, M, Vehmas, T, Harjanne, M & Aalto, T 2017, Second order add/drop filter with a single ring resonator. in AP Knights & GT Reed (eds), Silicon Photonics XII., 101080B, International Society for Optics and Photonics SPIE, Proceedings of SPIE, vol. 10108, Silicon Photonics XII, San Francisco, United States, 30/01/17. https://doi.org/10.1117/12.2252146

    Second order add/drop filter with a single ring resonator. / Cherchi, Matteo; Sun, Fei; Kapulainen, Markku; Vehmas, Tapani; Harjanne, Mikko; Aalto, Timo.

    Silicon Photonics XII. ed. / Andrew P. Knights; Graham T. Reed. International Society for Optics and Photonics SPIE, 2017. 101080B (Proceedings of SPIE, Vol. 10108).

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

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    T1 - Second order add/drop filter with a single ring resonator

    AU - Cherchi, Matteo

    AU - Sun, Fei

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    AU - Vehmas, Tapani

    AU - Harjanne, Mikko

    AU - Aalto, Timo

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    N2 - 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.

    AB - 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.

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    KW - integrated optics

    KW - multimode interference splitters

    KW - photonic integrated circuits

    KW - ring resonators

    KW - silicon photonics

    KW - WDM filters

    KW - Integrated optics

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    M3 - Conference article in proceedings

    SN - 978-1-5106-0657-9

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    A2 - Reed, Graham T.

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