Broadly tunable and low power penalty radio frequency phase shifter using a coupled silicon microcavity

Pandey, A and Selvaraja, SK (2020) Broadly tunable and low power penalty radio frequency phase shifter using a coupled silicon microcavity. In: Applied Optics, 59 (2). pp. 425-432.

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Abstract

We present a continuously tunable silicon photonics assisted radio frequency (RF) phase shifter using a coupled microring resonator. Using the coupled cavity, we demonstrate a sub-1 dB power penalty for a RF bandwidth of 34.5 GHz (9�43.5 GHz) and a phase shift of � over the reported frequency range. Rigorous optimization of the cavity design using the coupled-mode theory is carried out to realize ultranarrow resonance peaks with a low-extinction ratio and large phase shift. Thermal tuning of the cavity is used to tune the phase while all-optical tuning is exploited to achieve broadband operation. We present a detailed simulation and experimental study of the proposed configuration. The proposed device configuration exhibits a configurable resonance linewidth and extinction ratio that allows for a broad bandwidth and an extremely low power penalty microwave phase shifter. We believe the demonstration would allow better integration of the on-chip functional elements of integrated microwave photonics.

Item Type:	Journal Article
Publication:	Applied Optics
Publisher:	OSA - The Optical Society
Additional Information:	Copyright of this article belongs to OSA - The Optical Society
Keywords:	Bandwidth; Light extinction; Radio waves; Silicon photonics; Tuning, Coupled mode theory; Device configurations; Functional elements; Microring resonator; Microwave phase shifters; Microwave Photonics; Resonance linewidth; Silicon microcavities, Phase shifters
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	29 Jan 2020 06:03
Last Modified:	29 Jan 2020 06:03
URI:	http://eprints.iisc.ac.in/id/eprint/64398

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