Laser Frequency Noise in Coherent Optical Systems: Spectral Regimes and Impairments

Abstract Coherent communication networks are based on the ability to use multiple dimensions of the lightwave together with electrical domain compensation of transmission impairments. Electrical-domain dispersion compensation (EDC) provides many advantages such as network flexibility and enhanced fi...

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Autores principales:	Aditya Kakkar, Jaime Rodrigo Navarro, Richard Schatz, Xiaodan Pang, Oskars Ozolins, Aleksejs Udalcovs, Hadrien Louchet, Sergei Popov, Gunnar Jacobsen
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/d5810195914249a2b4208aa8d00fdc63
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spelling	oai:doaj.org-article:d5810195914249a2b4208aa8d00fdc632021-12-02T11:40:59ZLaser Frequency Noise in Coherent Optical Systems: Spectral Regimes and Impairments10.1038/s41598-017-00868-42045-2322https://doaj.org/article/d5810195914249a2b4208aa8d00fdc632017-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-00868-4https://doaj.org/toc/2045-2322Abstract Coherent communication networks are based on the ability to use multiple dimensions of the lightwave together with electrical domain compensation of transmission impairments. Electrical-domain dispersion compensation (EDC) provides many advantages such as network flexibility and enhanced fiber nonlinearity tolerance, but makes the system more susceptible to laser frequency noise (FN), e.g. to the local oscillator FN in systems with post-reception EDC. Although this problem has been extensively studied, statistically, for links assuming lasers with white-FN, many questions remain unanswered. Particularly, the influence of a realistic non-white FN-spectrum due to e.g., the presence of 1/f-flicker and carrier induced noise remains elusive and a statistical analysis becomes insufficient. Here we provide an experimentally validated theory for coherent optical links with lasers having general non-white FN-spectrum and EDC. The fundamental reason of the increased susceptibility is shown to be FN-induced symbol displacement that causes timing jitter and/or inter/intra symbol interference. We establish that different regimes of the laser FN-spectrum cause a different set of impairments. The influence of the impairments due to some regimes can be reduced by optimizing the corresponding mitigation algorithms, while other regimes cause irretrievable impairments. Theoretical boundaries of these regimes and corresponding criteria applicable to system/laser design are provided.Aditya KakkarJaime Rodrigo NavarroRichard SchatzXiaodan PangOskars OzolinsAleksejs UdalcovsHadrien LouchetSergei PopovGunnar JacobsenNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-10 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Aditya Kakkar Jaime Rodrigo Navarro Richard Schatz Xiaodan Pang Oskars Ozolins Aleksejs Udalcovs Hadrien Louchet Sergei Popov Gunnar Jacobsen Laser Frequency Noise in Coherent Optical Systems: Spectral Regimes and Impairments
description	Abstract Coherent communication networks are based on the ability to use multiple dimensions of the lightwave together with electrical domain compensation of transmission impairments. Electrical-domain dispersion compensation (EDC) provides many advantages such as network flexibility and enhanced fiber nonlinearity tolerance, but makes the system more susceptible to laser frequency noise (FN), e.g. to the local oscillator FN in systems with post-reception EDC. Although this problem has been extensively studied, statistically, for links assuming lasers with white-FN, many questions remain unanswered. Particularly, the influence of a realistic non-white FN-spectrum due to e.g., the presence of 1/f-flicker and carrier induced noise remains elusive and a statistical analysis becomes insufficient. Here we provide an experimentally validated theory for coherent optical links with lasers having general non-white FN-spectrum and EDC. The fundamental reason of the increased susceptibility is shown to be FN-induced symbol displacement that causes timing jitter and/or inter/intra symbol interference. We establish that different regimes of the laser FN-spectrum cause a different set of impairments. The influence of the impairments due to some regimes can be reduced by optimizing the corresponding mitigation algorithms, while other regimes cause irretrievable impairments. Theoretical boundaries of these regimes and corresponding criteria applicable to system/laser design are provided.
format	article
author	Aditya Kakkar Jaime Rodrigo Navarro Richard Schatz Xiaodan Pang Oskars Ozolins Aleksejs Udalcovs Hadrien Louchet Sergei Popov Gunnar Jacobsen
author_facet	Aditya Kakkar Jaime Rodrigo Navarro Richard Schatz Xiaodan Pang Oskars Ozolins Aleksejs Udalcovs Hadrien Louchet Sergei Popov Gunnar Jacobsen
author_sort	Aditya Kakkar
title	Laser Frequency Noise in Coherent Optical Systems: Spectral Regimes and Impairments
title_short	Laser Frequency Noise in Coherent Optical Systems: Spectral Regimes and Impairments
title_full	Laser Frequency Noise in Coherent Optical Systems: Spectral Regimes and Impairments
title_fullStr	Laser Frequency Noise in Coherent Optical Systems: Spectral Regimes and Impairments
title_full_unstemmed	Laser Frequency Noise in Coherent Optical Systems: Spectral Regimes and Impairments
title_sort	laser frequency noise in coherent optical systems: spectral regimes and impairments
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/d5810195914249a2b4208aa8d00fdc63
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Laser Frequency Noise in Coherent Optical Systems: Spectral Regimes and Impairments

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