UCL Discovery
UCL home » Library Services » Electronic resources » UCL Discovery

Modulator-free quadrature amplitude modulation signal synthesis

Liu, Z; Kakande, J; Kelly, B; O'Carroll, J; Phelan, R; Richardson, DJ; Slavik, R; (2014) Modulator-free quadrature amplitude modulation signal synthesis. Nature Communications , 5 , Article 5911. 10.1038/ncomms6911. Green open access

[thumbnail of Published article]
Text (Published article)
Liu_ncomms6911.pdf - Published Version

Download (3MB) | Preview
[thumbnail of Supplementary data]
Text (Supplementary data)
Liu_ncomms6911-s1.pdf - Published Version

Download (502kB) | Preview


The ability to generate high-speed on–off-keyed telecommunication signals by directly modulating a semiconductor laser’s drive current was one of the most exciting prospective applications of the nascent field of laser technology throughout the 1960s. Three decades of progress led to the commercialization of 2.5 Gbit s−1-per-channel submarine fibre optic systems that drove the growth of the internet as a global phenomenon. However, the detrimental frequency chirp associated with direct modulation forced industry to use external electro-optic modulators to deliver the next generation of on–off-keyed 10 Gbit s−1 systems and is absolutely prohibitive for today’s (>)100 Gbit s−1 coherent systems, which use complex modulation formats (for example, quadrature amplitude modulation). Here we use optical injection locking of directly modulated semiconductor lasers to generate complex modulation format signals showing distinct advantages over current and other currently researched solutions.

Type: Article
Title: Modulator-free quadrature amplitude modulation signal synthesis
Open access status: An open access version is available from UCL Discovery
DOI: 10.1038/ncomms6911
Publisher version: https://doi.org/10.1038/ncomms6911
Language: English
Additional information: This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10055090
Downloads since deposit
Download activity - last month
Download activity - last 12 months
Downloads by country - last 12 months

Archive Staff Only

View Item View Item