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Optimized pilot structure for PS-PDM ultrahigh-order QAM coherent optical transmission
We proposed and experimentally demonstrated a general pilot structure for probabilistic shaped (PS)-polarization division multiplexing (PDM) M-ary quadrature amplitude modulation (MQAM) coherent optical transmission, where a portion of PS-MQAM symbols is exploited as the pilot symbols with the same...
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Published in: | Optics letters 2024-03, Vol.49 (6), p.1579-1582 |
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container_title | Optics letters |
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creator | Shi, Xin Gao, Mingyi Huang, Xuejing Fan, Jiamin Han, Xinbang You, Xiaodi Shen, Gangxiang |
description | We proposed and experimentally demonstrated a general pilot structure for probabilistic shaped (PS)-polarization division multiplexing (PDM) M-ary quadrature amplitude modulation (MQAM) coherent optical transmission, where a portion of PS-MQAM symbols is exploited as the pilot symbols with the same information entropy as the transmitted signal. The pilot symbols are simultaneously used in the entire digital signal processing (DSP) modules for polarization de-multiplexing, frequency offset estimation, carrier phase recovery, nonlinear equalization, and linear equalization. Compared to the conventional quadrature phase shift keying (QPSK) pilot structure, the proposed MQAM pilot structure can yield the nonlinear properties of the overall signal so that nonlinear equalization can effectively improve the performance of the normalized generalized mutual information. The remarkable performance has been achieved at the shaping parameters of 3.25 and 4.35 for 1024QAM and 4096QAM signals based on the proposed pilot scheme, which corresponds to the raw spectral efficiency of 16.190 and 20.381 bit/s/Hz, respectively. The pilot ratio is optimized to 5% for higher achievable information rates (AIRs). |
doi_str_mv | 10.1364/OL.519424 |
format | article |
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The pilot symbols are simultaneously used in the entire digital signal processing (DSP) modules for polarization de-multiplexing, frequency offset estimation, carrier phase recovery, nonlinear equalization, and linear equalization. Compared to the conventional quadrature phase shift keying (QPSK) pilot structure, the proposed MQAM pilot structure can yield the nonlinear properties of the overall signal so that nonlinear equalization can effectively improve the performance of the normalized generalized mutual information. The remarkable performance has been achieved at the shaping parameters of 3.25 and 4.35 for 1024QAM and 4096QAM signals based on the proposed pilot scheme, which corresponds to the raw spectral efficiency of 16.190 and 20.381 bit/s/Hz, respectively. 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The pilot ratio is optimized to 5% for higher achievable information rates (AIRs).</description><subject>Digital signal processing</subject><subject>Entropy (Information theory)</subject><subject>Equalization</subject><subject>Multiplexing</subject><subject>Performance enhancement</subject><subject>Polarization</subject><subject>Pulse duration modulation</subject><subject>Quadrature amplitude modulation</subject><subject>Quadrature phase shift keying</subject><subject>Symbols</subject><issn>0146-9592</issn><issn>1539-4794</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2024</creationdate><recordtype>article</recordtype><recordid>eNpd0LtOwzAYBWALgWgpDLwAssQCQ4rviUdUrlKqFHFZo1xsmiqJg-0M8PQYtTAw_ZL16ej4AHCK0RxTwa6ydM6xZITtgSnmVEYslmwfTBFmIpJckgk4cm6DEBIxpYdgQhOWSMb5FLxlg2-65kvVcGha46Hzdqz8aBXUxsLVc7S6WcKx9bZYN-_ryNhaWfh0vYSVWSureg9NSKiKFgbSu65xrjH9MTjQRevUye7OwOvd7cviIUqz-8fFdRpVJKY-KnlChdAVCxcLnTBKa6ZERVFRht5SEF0nQlGhJMYJ0SS8lbIgOny2wAmnM3CxzR2s-RiV83koUKm2LXplRpcTyRMiJUYy0PN_dGNG24d2QcUkjmOOUVCXW1VZ45xVOh9s0xX2M8co_xk7z9J8O3awZ7vEsexU_Sd_16XfIyF35A</recordid><startdate>20240315</startdate><enddate>20240315</enddate><creator>Shi, Xin</creator><creator>Gao, Mingyi</creator><creator>Huang, Xuejing</creator><creator>Fan, Jiamin</creator><creator>Han, Xinbang</creator><creator>You, Xiaodi</creator><creator>Shen, Gangxiang</creator><general>Optical Society of America</general><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7SP</scope><scope>7U5</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><scope>7X8</scope><orcidid>https://orcid.org/0000-0001-5935-1225</orcidid><orcidid>https://orcid.org/0000-0002-2085-4578</orcidid></search><sort><creationdate>20240315</creationdate><title>Optimized pilot structure for PS-PDM ultrahigh-order QAM coherent optical transmission</title><author>Shi, Xin ; Gao, Mingyi ; Huang, Xuejing ; Fan, Jiamin ; Han, Xinbang ; You, Xiaodi ; Shen, Gangxiang</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c273t-b58366fc458316f8433d4e6c30ab959962fd86e36e91182f2599b9a2f942a1853</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2024</creationdate><topic>Digital signal processing</topic><topic>Entropy (Information theory)</topic><topic>Equalization</topic><topic>Multiplexing</topic><topic>Performance enhancement</topic><topic>Polarization</topic><topic>Pulse duration modulation</topic><topic>Quadrature amplitude modulation</topic><topic>Quadrature phase shift keying</topic><topic>Symbols</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Shi, Xin</creatorcontrib><creatorcontrib>Gao, Mingyi</creatorcontrib><creatorcontrib>Huang, Xuejing</creatorcontrib><creatorcontrib>Fan, Jiamin</creatorcontrib><creatorcontrib>Han, Xinbang</creatorcontrib><creatorcontrib>You, Xiaodi</creatorcontrib><creatorcontrib>Shen, Gangxiang</creatorcontrib><collection>PubMed</collection><collection>CrossRef</collection><collection>Electronics & Communications Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>MEDLINE - Academic</collection><jtitle>Optics letters</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Shi, Xin</au><au>Gao, Mingyi</au><au>Huang, Xuejing</au><au>Fan, Jiamin</au><au>Han, Xinbang</au><au>You, Xiaodi</au><au>Shen, Gangxiang</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Optimized pilot structure for PS-PDM ultrahigh-order QAM coherent optical transmission</atitle><jtitle>Optics letters</jtitle><addtitle>Opt Lett</addtitle><date>2024-03-15</date><risdate>2024</risdate><volume>49</volume><issue>6</issue><spage>1579</spage><epage>1582</epage><pages>1579-1582</pages><issn>0146-9592</issn><eissn>1539-4794</eissn><abstract>We proposed and experimentally demonstrated a general pilot structure for probabilistic shaped (PS)-polarization division multiplexing (PDM) M-ary quadrature amplitude modulation (MQAM) coherent optical transmission, where a portion of PS-MQAM symbols is exploited as the pilot symbols with the same information entropy as the transmitted signal. The pilot symbols are simultaneously used in the entire digital signal processing (DSP) modules for polarization de-multiplexing, frequency offset estimation, carrier phase recovery, nonlinear equalization, and linear equalization. Compared to the conventional quadrature phase shift keying (QPSK) pilot structure, the proposed MQAM pilot structure can yield the nonlinear properties of the overall signal so that nonlinear equalization can effectively improve the performance of the normalized generalized mutual information. The remarkable performance has been achieved at the shaping parameters of 3.25 and 4.35 for 1024QAM and 4096QAM signals based on the proposed pilot scheme, which corresponds to the raw spectral efficiency of 16.190 and 20.381 bit/s/Hz, respectively. 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source | Optica Publishing Group (OPG) |
subjects | Digital signal processing Entropy (Information theory) Equalization Multiplexing Performance enhancement Polarization Pulse duration modulation Quadrature amplitude modulation Quadrature phase shift keying Symbols |
title | Optimized pilot structure for PS-PDM ultrahigh-order QAM coherent optical transmission |
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