Comparison of Cross-section Profile Designs for Integrated Polarization Mode Controllers

Andersson, S. M.L., Hou, L. , Marsh, J. H. and Farmer, C. D. (2020) Comparison of Cross-section Profile Designs for Integrated Polarization Mode Controllers. In: 5th International Conference on the UK-China Emerging Technologies (UCET 2020), Glasgow, UK, 20-21 Aug 2020, ISBN 9781728194882 (doi:10.1109/UCET51115.2020.9205445)

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Abstract

Many laser applications in quantum technology require circularly polarized light at wavelengths accessible only through the GaAs-AlGaAs material system. Two proven designs of polarization mode convertor (PMC) were compared through simulation for a modified commercial 830 nm GaAs-AlGaAs structure. Structure type 1 used a deep-etched ridge waveguide, with a shallow-etched slot placed asymmetrically within the ridge. Structure type 2 also used a deep-etched ridge, but with sides of the ridge etched to different depths. Both structures support zero-order TE and TM modes, with the effective index difference between the modes determining the length of the PMC device. Although a range of dimensions and compositions was investigated, it was found the geometry of the waveguides did not significantly affect the effective index difference. The refractive index of the waveguide core was swept from 3.39 to 3.43, corresponding to Al contents from 0.45 to 0.3 respectively. In both structures, a higher index leads to the mode being concentrated in the core, which may lead to lower losses. As the structures give similar results, the main decider as to which one should be chosen should be the relative simplicity of fabrication.

Item Type:Conference Proceedings
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Farmer, Dr Corrie and Andersson, Sia and Marsh, Professor John and Hou, Dr Lianping
Authors: Andersson, S. M.L., Hou, L., Marsh, J. H., and Farmer, C. D.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
ISBN:9781728194882
Copyright Holders:Copyright © 2020 IEEE
First Published:First published in 2020 International Conference on UK-China Emerging Technologies (UCET)
Publisher Policy:Reproduced in accordance with the publisher copyright policy
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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
172610External engagement manager: CDT Photonic Integration for Advanced Data StorageJohn MarshEngineering and Physical Sciences Research Council (EPSRC)EP/L015323/1ENG - Electronics & Nanoscale Engineering