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We propose and demonstrate a self-coupled microring resonator for resonancesplitting by mutual mode coupling of cavity mode and counter-propagating modein Silicon-on-Insulator platform The resonator is constructed with aself-coupling region that can excite counter-propagating mode. Weexperimentally study the effect of self-coupling on the resonance splitting,resonance extinction, and quality-factor evolution and stability. Based on thecoupling, we achieve 72% of FSR splitting for a cavity with FSR 2.1 nm with <5% variation in the cavity quality factor. The self-coupled resonance splittingshows highly robust spectral characteristic that can be exploited for sensingand optical signal processing.

Tunable coupling-induced resonance splitting in self-coupled Silicon ring cavity with robust spectral characteristics