Open AccessCascade-coupled racetrack resonators based on the Vernier effect in the mid-infrared
Author(s) -
Benedetto Troia,
Ali Z. Khokhar,
Miloš Nedeljković,
Jordi Soler Penadés,
Vittorio M. N. Passaro,
Goran Z. Mashanovich
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.22.023990
Subject(s) - vernier scale , optics , materials science , resonator , free spectral range , insertion loss , extinction ratio , cascade , silicon on insulator , infrared , wavelength , silicon , optoelectronics , physics , chemistry , chromatography
In this paper we report the experimental demonstration of racetrack resonators in silicon-on-insulator technology platform operating in the mid-infrared wavelength range of 3.7-3.8 μm. Insertion loss lower than 1 dB and extinction ratio up to 30 dB were measured for single resonators. The experimental characterization of directional couplers and bending losses in silicon rib waveguides are also reported. Furthermore, we present the design and fabrication of cascade-coupled racetrack resonators based on the Vernier effect. Experimental spectra of Vernier architectures were demonstrated for the first time in the mid-infrared with insertion loss lower than 1 dB and maximum interstitial peak suppression of 10 dB.