GaN-based Distributed Feedback Laser Diodes for Optical Communications

Gwyn, S. et al. (2019) GaN-based Distributed Feedback Laser Diodes for Optical Communications. In: Fourth International Conference on Applications of Optics and Photonics, Lisbon, Portugal, 31 May - 04 Jun 2019, 112070O. ISBN 9781510631632 (doi: 10.1117/12.2527074)

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Over the past 20 years, research into Gallium Nitride (GaN) has evolved from LED lighting to Laser Diodes (LDs), with applications ranging from quantum to medical and into communications. Previously, off-the-shelf GaN LDs have been reported with a view on free space and underwater communications. However, there are applications where the ability to select a single emitted wavelength is highly desirable, namely in atomic clocks or in filtered free-space communications systems. To accomplish this, Distributed Feedback (DFB) geometries are utilised. Due to the complexity of overgrowth steps for buried gratings in III-Nitride material systems, GaN DFBs have a grating etched into the sidewall to ensure single mode operation, with wavelengths ranging from 405nm to 435nm achieved. The main motivation in developing these devices is for the cooling of strontium ions (Sr+ ) in atomic clock applications, but their feasibility for optical communications have also been investigated. Data transmission rates exceeding 1 Gbit/s have been observed in unfiltered systems, and work is currently ongoing to examine their viability for filtered communications. Ultimately, transmission through Wavelength Division Multiplexing (WDM) or Orthogonal Frequency Division Multiplexing (OFDM) is desired, to ensure that data is communicated more coherently and efficiently. We present results on the characterisation of GaN DFBs, and demonstrate their capability for use in filtered optical communications systems.

Item Type:Conference Proceedings
Additional Information:This research has been supported by the European Union with grant E10509, Innovate UK through grant 132543, the National Centre for Research and Development (E10509/29/NCBR/2017 and 1/POLBER-3/2018 and project NCN-2013/11/B/ST3/04263), and the Engineering and Physical Sciences Research Council (RCUK Grant no. EP/L015323/1).
Glasgow Author(s) Enlighten ID:Docherty, Mr Kevin and Viola, Mr Shaun and Watson, Dr Scott and Gwyn, Mr Steffan and Kelly, Professor Anthony and Giuliano, Mr Giovanni
Authors: Gwyn, S., Watson, S., Viola, S., Giuliano, G., Slight, T. J., Stanczyk, S., Grzanka, S., Yadav, A., Docherty, K. E., Rafailov, E., Perlin, P., Najda, S. P., Leszczynski, M., and Kelly, A. E.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Copyright Holders:Copyright © 2019 SPIE
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
174106Coolblue - 132543Anthony KellyEngineering and Physical Sciences Research Council (EPSRC)EP/R001774/1ENG - Electronics & Nanoscale Engineering