109. hybrid multimode resonators based on grating assisted counter-directional couplers

Department: Electrical & Computer Engineering
Faculty Advisor(s): Y. Shaya Fainman

Primary Student
Name: Jordan Austin Davis
Email: jad022@ucsd.edu
Phone: 937-251-9251
Grad Year: 2020

Abstract
Silicon photonic waveguides are typically designed to operate with the fundamental mode due to low cross talk with higher order modes and low propagation loss. However, currently, silicon photonics is being exploited for operation with higher order modes propagation for mode-division multiplexing (MDM). This approach utilizes the orthogonal modes of a waveguide by encoding information both in space and wavelength to augment bandwidth limited wavelength-division multiplexing (WDM) systems. Conventionally, ring resonators and grating structures are applied to achieve spatial modes conversion. We explore an alternative approach to mode conversion using counter-directional resonators. We introduce a cavity into grating assisted directional couplers, offering both flexibility in design and wavelength selectivity provided by resonant structures. Our compact (54.5 μm2) device is demonstrated experimentally to operate with resonant 1st and 2nd order guided TE-modes. We observe 9 dB extinction ratio for the 1st order quasi-TE mode input.

Industry Application Area(s)
Electronics/Photonics | Semiconductor

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