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Comprehensive Study of Equalization-Enhanced Phase Noise in Coherent Optical Systems
RISE, Swedish ICT, Acreo.ORCID iD: 0000-0001-8389-158x
RISE, Swedish ICT, Acreo.ORCID iD: 0000-0001-5730-9656
KTH Royal Institute of Technology, Sweden.
VPIPhotonics GmBH, Germany.
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2015 (English)In: IEEE transactions on intelligent transportation systems (Print), ISSN 1524-9050, E-ISSN 1558-0016, Vol. 33, no 23, p. 4834 -4841Article in journal (Refereed) Published
Abstract [en]

A thorough analysis of equalization-enhanced phase noise (EEPN) and its impact on the coherent optical system is presented. We show with a time-domain analysis that EEPN is caused due to the interference of multiple delayed versions of the dispersed signal, generated by intermixing of the received dispersed signal, and the noise side bands of the local oscillator (LO) in the photodetectors. We derive statistical properties such as the mean, variance, and error vector magnitude of the received signal influenced with EEPN. We show that in coherent optical systems utilizing electronic dispersion compensation, this noise corresponds to multipath fading in wireless communication systems. Closed-form expressions of necessary LO linewidth and/or mitigation bandwidth for a general system configuration and specified OSNR penalty are given. The expressions for system design parameters, validated with system simulations, show that higher order modulation formats, such as 16-quadrature amplitude modulation and beyond, put stringent demands on the LO linewidth unless a mitigation technique is used.

Place, publisher, year, edition, pages
2015. Vol. 33, no 23, p. 4834 -4841
Keywords [en]
Coherent receivers, quadrature amplitude modulation (QAM), equalization-enhanced phase noise (EEPN), laser linewidth, optical communication, digital signal processing (DSP), electronic dispersion compensation (EDC), multipath fading
National Category
Computer and Information Sciences
Identifiers
URN: urn:nbn:se:ri:diva-31897DOI: 10.1109/JLT.2015.2491363OAI: oai:DiVA.org:ri-31897DiVA, id: diva2:1151755
Available from: 2017-10-24 Created: 2017-10-24 Last updated: 2019-07-02Bibliographically approved

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Kakkar, AdityaNavarro, Jaime RodrigoOzolins, Oskars

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