20 February 2017 Second order add/drop filter with a single ring resonator
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Proceedings Volume 10108, Silicon Photonics XII; 101080B (2017) https://doi.org/10.1117/12.2252146
Event: SPIE OPTO, 2017, San Francisco, California, United States
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.
Conference Presentation
© (2017) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Matteo Cherchi, Matteo Cherchi, Fei Sun, Fei Sun, Markku Kapulainen, Markku Kapulainen, Tapani Vehmas, Tapani Vehmas, Mikko Harjanne, Mikko Harjanne, Timo Aalto, Timo Aalto, } "Second order add/drop filter with a single ring resonator", Proc. SPIE 10108, Silicon Photonics XII, 101080B (20 February 2017); doi: 10.1117/12.2252146; https://doi.org/10.1117/12.2252146
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