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Athermal microring resonator based on the resonance splitting of dual-ring structure

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Abstract

Recently, silicon-on-insulator (SOI) microring resonators have attracted considerable attention for its potential applications in on-chip integrated photonic systems. But silicon possesses large positive thermo-optic coefficient (TOC), ~1.86×10-4 K-1, which is the main obstacle for microring resonators in thermally insensitive applications. Several methods have been reported aiming at athermal microring resonators such as integrating with heaters [1], cladding with negative TOC materials [2, 3], utilizing broadband microrings [4] and coupling with Mach–Zehnder Interferometer [5]. However, essential requirements for on-chip applications, such as compact footprint, CMOS compatibility, and low energy consumption, are not yet achieved, and the on-chip athermal microrings are still inaccessible. In this paper, we present a novel athermal scheme for achieving athermal SOI microring resonators based on dual-ring resonance splitting, which is promising to satisfy all the requirements mentioned above.

© 2014 Optical Society of America

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