Zero-birefringence silicon slot waveguides with L-rails

Samad, SA and Talabattula, S (2019) Zero-birefringence silicon slot waveguides with L-rails. In: 2019 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics, 23-27 June, Munich; Germany.

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Abstract

Silicon slot waveguides are widely used for photonic sensing 1 and optical signal procesing 2. We propose a novel slot formed when a sub-micron rib waveguide is slit with vertical symmetry resulting in L shaped rails to have Zero Birefringence (ZB). This geometry gives the flexibility to choose the slab (strip-load) region for doping or modulation. Index modulation of the slab sidewall offers platform for Bragg gratings with sub-nanometer stop bands 3,4. We show that slots with L-rails possess better confinement and higher tolerance to sidewall width variations compared to strip-rails 5 and ZB can be achieved by engineering the waveguide geometry. Optimal waveguide-dimensions at a wavelength λ = 1550 nm are designed from modal analysis through full-vectorial computations.

Item Type:	Conference Paper
Publication:	Optics InfoBase Conference Papers
Publisher:	OSA - The Optical Society
Additional Information:	cited By 0; Conference of The European Conference on Lasers and Electro-Optics, CLEOEurope₂₀₁₉ ; Conference Date: 23 June 2019 Through 27 June 2019; Conference Code:142098
Keywords:	Birefringence; Modal analysis; Modulation; Silicon, Index modulation; Optical signals; Photonic sensing; Rib waveguides; Slot waveguide; Waveguide dimensions; Waveguide geometry; Zero birefringence, Waveguides
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering > Electrical Communication Engineering - Technical Reports
Date Deposited:	09 Jun 2020 11:04
Last Modified:	09 Jun 2020 11:04
URI:	http://eprints.iisc.ac.in/id/eprint/65545

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