Applications of Single Frequency Blue Lasers

Scott Watson, Steffan Gwyn, Martin Knapp, Shaun Viola, Giovanni Giuliano, Thomas J. Slight, Szymon Stanczyk, Szymon Grzanka, Conor Robinson, Amit Yadav, Kevin E. Docherty, Edik Rafailov, Piotr Perlin, Stephen P. Najda, Mike Leszczynski, Mohsin Haji, Anthony E. Kelly

Research output: Chapter in Book/Published conference outputConference publication


Gallium nitride (GaN) sources are becoming a regular part of today’s world and are now key devices for lighting infrastructures, communications systems and quantum applications, amongst others. In particular, many applications have seen the shift from LEDs to laser diodes to make use of higher powers, higher bandwidths and increased transmission distances. Laser communication systems are well established, however there are applications where the ability to select a single emitted wavelength is highly desirable, such as quantum atomic clocks or in filtered communication systems. Distributed feedback (DFB) lasers have been realised emitting at a single wavelength where the grating structure is etched into the sidewall of the ridge. The main motivation in developing these lasers is for the cooling of ions in atomic clocks; however their feasibility for optical communications is also explored. Narrow linewidth lasers are desirable and this paper will explore how this is achieved. Data rates in excess of 1 Gbit/s have also been achieved in a directly modulated, unfiltered system. These devices lend themselves towards wavelength division multiplexing and filtered optical communications systems and this will be analysed further in the work presented here.
Original languageEnglish
Title of host publication21st International Conference on Transparent Optical Networks, ICTON 2019
ISBN (Electronic)978-1-7281-2779-8
ISBN (Print)978-1-7281-2780-4
Publication statusE-pub ahead of print - 19 Sept 2019
Event2019 21st International Conference on Transparent Optical Networks (ICTON) - Angers, France
Duration: 9 Jul 201913 Jul 2019

Publication series

Name2019 21st International Conference on Transparent Optical Networks (ICTON)
ISSN (Print)2162-7339
ISSN (Electronic)2161-2064


Conference2019 21st International Conference on Transparent Optical Networks (ICTON)


  • Distributed feedback lasers
  • Gallium nitride
  • Optical atomic clocks
  • Optical communications


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