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Effective linewidth of semiconductor lasers for coherent optical data links
RISE, Swedish ICT, Acreo.
RISE, Swedish ICT, Acreo.ORCID iD: 0000-0001-9839-7488
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2016 (English)In: Photonics, ISSN 2304-6732, Vol. 3, no 2, article id 39Article in journal (Refereed) Published
Abstract [en]

We discuss the implications of using monolithically integrated semiconductor lasers in high capacity optical coherent links suitable for metro applications, where the integration capabilities of semiconductor lasers make them an attractive candidate to reduce transceiver cost. By investigating semiconductor laser frequency noise profiles we show that carrier induced frequency noise plays an important role in system performance. We point out that, when such lasers are employed, the commonly used laser linewidth fails to estimate systemperformance, and we propose an alternative figure of merit that we name "Effective Linewidth". We derive this figure of merit analytically, explore it by numerical simulations and experimentally validate our results by transmitting a 28 Gbaud DP-16QAM over an optical link. Our investigations cover the use of semiconductor lasers both in the transmitter side and as a local oscillator at the receiver. The obtained results show that our proposed "effective linewidth" is easy to measure and accounts for frequency noise more accurately, and hence the penalties associated to phase noise in the received signal.

Place, publisher, year, edition, pages
2016. Vol. 3, no 2, article id 39
Keywords [en]
Coherent communications, Fiber optics communications, Laser linewidth
National Category
Computer and Information Sciences
Identifiers
URN: urn:nbn:se:ri:diva-32584DOI: 10.3390/photonics3020039Scopus ID: 2-s2.0-85018311747OAI: oai:DiVA.org:ri-32584DiVA, id: diva2:1155345
Available from: 2017-11-07 Created: 2017-11-07 Last updated: 2018-07-05Bibliographically approved

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  • apa
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