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High efficiency DBR assisted grating chirp generators for silicon nitride fiber-chip coupling

Nambiar, Siddharth and Ranganath, Praveen and Kallega, Rakshitha and Selvaraja, Shankar Kumar (2019) High efficiency DBR assisted grating chirp generators for silicon nitride fiber-chip coupling. In: SCIENTIFIC REPORTS, 9 .

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Official URL: https://dx.doi.org/10.1038/s41598-019-55140-8

Abstract

Silicon Nitride (SiN) is emerging as a promising material for a variety of integrated photonic applications. Given its low index contrast however, a key challenge remains to design efficient couplers for the numerous platforms in SiN photonics portfolio. Using a combination of bottom reflector and a chirp generating algorithm, we propose and demonstrate high efficiency, grating couplers on two distinct SiN platforms. For a partially etched grating on 500 nm thick SiN, a calculated peak efficiency of -0.5 dB/coupler is predicted, while for a fully etched grating on 400 nm thick SiN, an efficiency of -0.4 dB/coupler is predicted. Experimentally measured coupling efficiencies are observed to be -1.17 and -1.24 dB/coupler for the partial and fully etched grating couplers respectively in the C-L band region. Furthermore, through numerical simulations, it is shown that the chirping algorithm can be implemented in eight additional combinations comprising SiN film thickness between 300-700 nm as well as alternate claddings, to achieve a per coupler loss between -0.33 to -0.65 dB.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to NATURE PUBLISHING GROUP, MACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLAND
Keywords: PHOTONIC CIRCUITS; WIDE BANDWIDTH; COUPLERS; DESIGN
Department/Centre: Division of Interdisciplinary Research > Centre for Nano Science and Engineering
Depositing User: Id for Latest eprints
Date Deposited: 07 Jan 2020 07:47
Last Modified: 07 Jan 2020 07:47
URI: http://eprints.iisc.ac.in/id/eprint/64292

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