title: Series-coupled silicon racetrack resonators and the Vernier effect: theory and measurement.
abstract: Silicon-on-insulator racetrack resonators can be used as multiplexers in wavelength division multiplexing applications. The free spectral range should be comparable to the span of the C-band so that a maximum number of channels can be multiplexed. However, the free spectral range is inversely proportional to the length of the resonator and, therefore, bending losses can become non-negligible. A viable alternative to increase the free spectral range is to use the Vernier effect. In this work, we present the theory of series-coupled racetrack resonators exhibiting the Vernier effect. We demonstrate the experimental performance of the device using silicon-on-insulator strip waveguides. The extended free spectral range is 36 nm and the interstitial peak suppression is from 9 dB to 17 dB.
authors.affiliation: Department of Electrical and Computer Engineering, University of British Columbia, Vancouver, British Columbia, Canada. rboeck@ieee.org
authors.forename: Robi
authors.initials: R
authors.lastname: Boeck
authors.forename: Nicolas A
authors.initials: NA
authors.lastname: Jaeger
authors.forename: Nicolas
authors.initials: N
authors.lastname: Rouger
authors.forename: Lukas
authors.initials: L
authors.lastname: Chrostowski