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Authors: A. Li, W. Bogaerts
Title: Backcoupling manipulation in silicon ring resonators
Format: International Journal
Publication date: 6/2018
Journal/Conference/Book: Photonics Research
Volume(Issue): 6(6) p.620-629
DOI: 10.1364/PRJ.6.000620
Citations: 19 ( - last update: 14/7/2024)
17 (OpenCitations - last update: 27/6/2024)
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In this paper, we theoretically propose and experimentally demonstrate the manipulation of a novel degree of freedom in ring resonators, which is the coupling from the clockwise input to the counterclockwise propagating mode (and vice versa). We name this mechanism backcoupling, in contrast with the normal forward-coupling of a directional coupler. It is well known that internal reflections will cause peak splitting in a ring resonator. Our previous research demonstrated that the peak asymmetry will be strongly influenced by the backcoupling. Thus, it is worth manipulating the backcoupling in order to gain full control of a split resonance for the benefit of various resonance-splitting-based applications. While it is difficult to directly manipulate the backcoupling of a conventional directional coupler, here we design a circuit explicitly for manipulating the backcoupling. It can be potentially developed for applications such as single sideband filter, resonance splitting elimination, Fano resonance, and ultrahigh-Q and finesse.

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