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

NameProceedings of SPIE
PublisherSPIE
Volume10108
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

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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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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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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AU - Cherchi, Matteo

AU - Sun, Fei

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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 - multimode interference splitters

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KW - ring resonators

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KW - WDM filters

KW - Integrated optics

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A2 - Knights, Andrew P.

A2 - Reed, Graham T.

PB - International Society for Optics and Photonics SPIE

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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