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Analysis of Spectral and Energy Efficiency Tradeoff in Single-Line Rate WDM Links
KTH Royal Institute of Technology, Sweden.ORCID iD: 0000-0003-3754-0265
RISE - Research Institutes of Sweden, ICT, Acreo. KTH Royal Institute of Technology, Sweden.
KTH Royal Institute of Technology, Sweden.
KTH Royal Institute of Technology, Sweden.
2017 (English)In: Journal of Lightwave Technology, ISSN 0733-8724, E-ISSN 1558-2213, Vol. 35, no 10, p. 1847-1857, article id 7812686Article in journal (Refereed) Published
Abstract [en]

This paper investigates, through simulations, the tradeoff between energy efficiency (EE) and the overall spectral efficiency (SE) of fiber optic links for a given capacity and a link length. The comparison is made for various modulation formats, span lengths, and with/without using forward error correction (FEC). The power consumption of the different system components is estimated from the data sheets of the state-of-the-art equipment. Results show that the use of long single-mode fiber spans (i.e., more than 40 km) improves EE when coherent modulation formats are used. However, with noncoherent formats, the span length must be selected depending on SE, aggregated traffic amount needs to be transmitted, and link length. For almost all modulation formats, FEC reduces the overall energy consumption despite being one of the main power consumers in fiber optic communication systems. The power consumption of 3Rs becomes particularly important when the linear crosstalk limits the system reach. In all other cases, the power consumption of transponders and optical line amplifiers is dominating, but their contribution changes depending on the aggregated traffic amount and system reach.

Place, publisher, year, edition, pages
2017. Vol. 35, no 10, p. 1847-1857, article id 7812686
Keywords [en]
3R regeneration, energy efficiency, energy per bit, forward-error correction, modulation formats, span length, spectral efficiency, Communication channels (information theory), Electric power utilization, Energy utilization, Error correction, Fiber optics, Forward error correction, Light amplifiers, Modulation, Optical fiber communication, Single mode fibers, Energy-per-bit, Spectral efficiencies
National Category
Computer and Information Sciences
Identifiers
URN: urn:nbn:se:ri:diva-32519DOI: 10.1109/JLT.2017.2651165Scopus ID: 2-s2.0-85018908373OAI: oai:DiVA.org:ri-32519DiVA, id: diva2:1155553
Available from: 2017-11-08 Created: 2017-11-08 Last updated: 2018-07-10Bibliographically approved

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Udalcovs, Aleksejs

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