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Comprehensive grating enabled silicon nitride fiber-chip couplers in the SNIR wavelength band

Nambiar, S and Chatterjee, A and Selvaraja, SK (2022) Comprehensive grating enabled silicon nitride fiber-chip couplers in the SNIR wavelength band. In: Optics Express, 30 (3). pp. 4327-4341.

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Official URL: https://doi.org/10.1364/OE.444784


We present silicon nitride grating enabled fiber-chip coupling in the sub-near-infrared band. We present a comprehensive design and simulation and experimental demonstration of uniform and apodized grating couplers, with and without bottom reflectors. The mode engineering yields a best efficiency of -1.6 dB for apodized grating design, which is further improved to -0.66 dB with a bottom reflector. Experimentally, we demonstrate a coupling efficiency of -2.2 dB for the optimized design. Furthermore, we present a detailed simulation and measurement comparison of various grating parameters and the effect of fabrication tolerances on the grating performance. © 2022 Optica Publishing Group.

Item Type: Journal Article
Publication: Optics Express
Publisher: The Optical Society
Additional Information: The copyright for this article belongs to Authors
Keywords: Efficiency; Infrared devices; Reflection, Apodized gratings; Comprehensive designs; Coupling efficiency; Design and simulation; Experimental demonstrations; Fiber-chip-coupling; Grating couplers; Grating design; Near infrared band; Wavelength band, Silicon nitride
Department/Centre: Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited: 07 Feb 2022 12:06
Last Modified: 07 Feb 2022 12:06
URI: http://eprints.iisc.ac.in/id/eprint/71234

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