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dc.contributor.authorFaruk, Mden
dc.contributor.authorSavory, Seben
dc.date.accessioned2017-04-12T13:16:38Z
dc.date.available2017-04-12T13:16:38Z
dc.date.issued2017-02-01en
dc.identifier.issn0733-8724
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/263634
dc.description.abstractDigital coherent transceivers have revolutionized optical fiber communications due to their superior performance offered compared to intensity modulation and direct detection based alternatives. As systems employing digital coherent transceivers seek to approach their information theoretic capacity, the use of multilevel modulation formats combined with appropriate forward error correction becomes essential. Given this context, in this tutorial paper, we therefore explore the digital signal processing (DSP) utilized in a coherent transceiver with a focus on multilevel modulation formats. By way of an introduction, we open by discussing the photonic technology required to realize a coherent transceiver. After discussing this interface between the analog optical channel and the digital domain, the rest of the paper is focused on DSP. We begin by discussing algorithms that correct for imperfections in the optical to digital conversion, including IQ imbalance and timing skew. Next, we discuss channel equalization including means for their realization for both quasi-static and dynamic channel impairments. Synchronization algorithms that correct for the difference between the transmitter and receiver oscillators both optical and electrical are then discussed and issues associated with symbol decoding highlighted. For most of the cases, we start with polarization division multiplexed quadrature phase-shift keying (PDM-QPSK) format as a basis and then discuss the extension to allow for high order multilevel formats. Finally, we conclude by discussing some of the open research challenges in the field.
dc.description.sponsorshipThis work was supported in part by the EU project ICONE (608099) and EPSRC through INSIGHT (EP/L026155/2) and UNLOC (EP/J017582/1).
dc.language.isoenen
dc.publisherIEEE
dc.subjectmodulationen
dc.subjectoptical transmittersen
dc.subjecttransceiversen
dc.subjectoptical fibersen
dc.subjectoptical receiversen
dc.subjectoptical fiber communicationen
dc.subjectcoherent detectionen
dc.titleDigital Signal Processing for Coherent Transceivers Employing Multilevel Formatsen
dc.typeArticle
prism.publicationDate2017en
prism.publicationNameJournal of Lightwave Technologyen
dc.identifier.doi10.17863/CAM.8992
dcterms.dateAccepted2017-01-25en
rioxxterms.versionofrecord10.1109/JLT.2017.2662319en
rioxxterms.versionAMen
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2017-02-01en
dc.contributor.orcidFaruk, Md [0000-0002-6045-6291]
dc.contributor.orcidSavory, Seb [0000-0002-6803-718X]
dc.identifier.eissn1558-2213
rioxxterms.typeJournal Article/Reviewen
pubs.funder-project-idEPSRC (via University College London (UCL)) (EP/J017582/1)
pubs.funder-project-idEPSRC (EP/L026155/2)
pubs.funder-project-idEC FP7 MC ITN (608099)


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