Open AccessEmbedded coupled microrings with high-finesse and close-spaced resonances for optical signal processing
Author(s) -
Mario C. M. M. Souza,
Luís A. M. Barea,
Felipe Vallini,
Guilherme Rezende,
Gustavo S. Wiederhecker,
Newton C. Frateschi
Publication year - 2014
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.010430
Subject(s) - finesse , free spectral range , optics , resonator , resonance (particle physics) , footprint , photonics , materials science , extinction ratio , wavelength , optoelectronics , microwave , optical switch , channel spacing , optical ring resonators , wavelength division multiplexing , physics , fabry–pérot interferometer , paleontology , particle physics , quantum mechanics , biology
Single microring resonators have been used in applications such as wavelength multicasting and microwave photonics, but the dependence of the free spectral range with ring radius imposes a trade-off between the required GHz optical channel spacing, footprint and power consumption. We demonstrate four-channel all-optical wavelength multicasting using only 1 mW of control power, with converted channel spacing of 40-60 GHz. Our device is based on a compact embedded microring design fabricated on a scalable SOI platform. The coexistence of close resonance spacing and high finesse (205) in a compact footprint is possible due to enhanced quality factors (30,000) resulting from the embedded configuration and the coupling-strength dependence of resonance spacing, instead of ring size. In addition, we discuss the possibility of achieving continuously mode splitting from a single-notch resonance up to 40 GHz.