A simple and novel method to make a silicon ring resonator without the limit of free spectral range (FSR) is presented. For many applications, a ring resonator is desired with an ultra-wide FSR, a high quality factor, a large extinction ratio and low-fabrication complexity. In this paper we propose a novel method to obtain such a ring resonator, which is a single all-silicon micro-ring with a FSR as large as 150 nm around 1550 nm. It's based on the well-known phenomenon of resonance splitting.
Ang Li and Wim Bogaerts, "A simple and novel method to obtain an FSR free silicon ring resonator," Proc. SPIE 9891, Silicon Photonics and Photonic Integrated Circuits V, 989115 (Presented at SPIE Photonics Europe: April 06, 2016; Published: 13 May 2016); https://doi.org/10.1117/12.2223644.
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