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Proceedings Paper

Second order add/drop filter with a single ring resonator
Author(s): Matteo Cherchi; Fei Sun; Markku Kapulainen; Tapani Vehmas; Mikko Harjanne; Timo Aalto
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Paper 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.

Paper Details

Date Published: 20 February 2017
PDF: 9 pages
Proc. SPIE 10108, Silicon Photonics XII, 101080B (20 February 2017); doi: 10.1117/12.2252146
Show Author Affiliations
Matteo Cherchi, VTT Technical Research Ctr. of Finland Ltd. (Finland)
Fei Sun, VTT Technical Research Ctr. of Finland Ltd. (Finland)
Markku Kapulainen, VTT Technical Research Ctr. of Finland Ltd. (Finland)
Tapani Vehmas, VTT Technical Research Ctr. of Finland Ltd. (Finland)
Mikko Harjanne, VTT Technical Research Ctr. of Finland Ltd. (Finland)
Timo Aalto, VTT Technical Research Ctr. of Finland Ltd. (Finland)

Published in SPIE Proceedings Vol. 10108:
Silicon Photonics XII
Graham T. Reed; Andrew P. Knights, Editor(s)

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