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Resumo - Neste trabalho é apresentada uma transmiss&#227 o óptica experimental de 3,58 TB/s utilizando 32 canais modulados a 112 Gb/s com o uso do formato de modula&#231 &#227 o NRZ-DP-QPSK e detec&#231 &#227 o coerente. Os efeitos da filtragem óptica imposta pelos ROADMs em redes ópticas s&#227 o analisados. Um alcance máximo de 4050 km é obtido em uma estrutura de propaga&#231 &#227 o baseada em fibras de sílica pura e EDFAs como estrutura de amplifica&#231 &#227 o.
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内容介绍
<html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta charset="utf-8"> <meta name="generator" content="pdf2htmlEX"> <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"> <link rel="stylesheet" href="https://static.pudn.com/base/css/base.min.css"> <link rel="stylesheet" href="https://static.pudn.com/base/css/fancy.min.css"> <link rel="stylesheet" href="https://static.pudn.com/prod/directory_preview_static/626b9c347ae5df2aa7180f7f/raw.css"> <script src="https://static.pudn.com/base/js/compatibility.min.js"></script> <script src="https://static.pudn.com/base/js/pdf2htmlEX.min.js"></script> <script> try{ pdf2htmlEX.defaultViewer = new pdf2htmlEX.Viewer({}); }catch(e){} </script> <title></title> </head> <body> <div id="sidebar" style="display: none"> <div id="outline"> </div> </div> <div id="pf1" class="pf w0 h0" data-page-no="1"><div class="pc pc1 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/626b9c347ae5df2aa7180f7f/bg1.jpg"><div class="t m0 x1 h2 y1 ff1 fs0 fc0 sc0 ls0 ws0">XXIX SI<span class="_ _0"></span>MP&#211;SIO BRASIL<span class="_ _0"></span>EIRO DE TELECOMUNI<span class="_ _0"></span>CA&#199;&#213;ES <span class="ff2">&#8211;</span> <span class="ff2">SBrT&#8217;11, 02</span>-05 DE OU<span class="_ _0"></span>TUBRO DE 2011,<span class="_ _0"></span> CURITI<span class="_ _0"></span>BA, PR </div><div class="t m0 x2 h3 y2 ff1 fs1 fc0 sc0 ls0 ws0"> </div><div class="t m0 x3 h4 y3 ff1 fs2 fc0 sc0 ls0 ws0">Transmission of 32 x 112 Gb/s using the <span class="ls1">NRZ</span>-<span class="_ _1"></span><span class="ls1">DP</span>-</div><div class="t m0 x4 h4 y4 ff1 fs2 fc0 sc0 ls0 ws0">QPSK Modulation Form<span class="_ _0"></span>at over<span class="_ _1"></span> 4050 km <span class="ls2">in</span> High </div><div class="t m0 x5 h4 y5 ff1 fs2 fc0 sc0 ls0 ws0">Spectrally Efficient WDM networks </div><div class="t m0 x6 h5 y6 ff1 fs3 fc0 sc0 ls0 ws0">J&#250;lio C. R. F. Oliveira, Reginaldo Silva, Adolfo F. Herbster, Edson P. Silva, Vitor R. Bedotti, J<span class="_ _1"></span>&#250;lio C. M. </div><div class="t m0 x7 h5 y7 ff1 fs3 fc0 sc0 ls0 ws0">Diniz, Eduardo S. Rosa, Ant&#244;nio A. Juriollo<span class="_ _1"></span> e Alberto<span class="_ _0"></span> Paradisi </div><div class="t m0 x2 h3 y8 ff1 fs1 fc0 sc0 ls0 ws0"> </div><div class="t m0 x8 h6 y9 ff3 fs4 fc0 sc0 ls0 ws0">Resumo<span class="ff4"> <span class="_ _2"> </span>- <span class="_ _3"> </span>Neste <span class="_ _3"> </span>trabalho <span class="_ _3"> </span>&#233; <span class="_ _3"> </span>apresentada <span class="_ _3"> </span>uma <span class="_ _3"> </span>transmiss&#227;o </span></div><div class="t m0 x1 h6 ya ff4 fs4 fc0 sc0 ls0 ws0">&#243;ptica <span class="_ _1"></span>experimental <span class="_ _1"></span>de <span class="_ _4"></span>3,58 <span class="_ _4"></span>TB/s <span class="_ _1"></span>utilizando <span class="_ _1"></span>3<span class="_ _1"></span>2 <span class="_ _1"></span>canais <span class="_ _4"></span>m<span class="_ _0"></span>odulados </div><div class="t m0 x1 h6 yb ff4 fs4 fc0 sc0 ls0 ws0">a 112 Gb/s com o <span class="_ _1"></span>uso do for<span class="_ _1"></span>ma<span class="_ _0"></span>to <span class="_ _1"></span>de modula&#231;&#227;o NRZ-<span class="ls3">DP</span>-QPSK<span class="_ _1"></span> e </div><div class="t m0 x1 h6 yc ff4 fs4 fc0 sc0 ls4 ws0">de<span class="ls0">tec&#231;&#227;o <span class="_ _5"> </span>coerente. <span class="_ _5"> </span>Os <span class="_ _5"> </span>efeitos <span class="_ _5"> </span>da <span class="_ _6"></span>filtragem <span class="_ _5"> </span>&#243;ptica <span class="_ _6"> </span>i<span class="_ _1"></span>mposta <span class="_ _6"> </span>pelos </span></div><div class="t m0 x1 h6 yd ff4 fs4 fc0 sc0 ls0 ws0">ROADMs <span class="_ _7"></span>em <span class="_ _7"></span>redes <span class="_ _7"></span>&#243;pticas <span class="_ _4"></span>s&#227;<span class="_ _1"></span>o <span class="_ _4"></span>a<span class="_ _1"></span>nalisados. <span class="_ _7"></span>Um <span class="_ _7"></span>alcance <span class="_ _7"></span>m&#225;ximo </div><div class="t m0 x1 h6 ye ff4 fs4 fc0 sc0 ls0 ws0">de <span class="_ _7"></span>4050 <span class="_ _6"></span>km <span class="_ _7"></span>&#233; <span class="_ _6"></span>obtido <span class="_ _7"></span>em <span class="_ _6"></span>uma <span class="_ _7"></span>estrutura <span class="_ _7"></span>de <span class="_ _6"></span>propaga&#231;&#227;o <span class="_ _7"></span>baseada </div><div class="t m0 x1 h6 yf ff4 fs4 fc0 sc0 ls0 ws0">em <span class="_ _8"> </span>fibras <span class="_ _8"> </span>de <span class="_ _9"> </span>s&#237;lica <span class="_ _8"> </span>pura <span class="_ _9"> </span>e <span class="_ _8"> </span>EDFAs <span class="_ _8"> </span>c<span class="_ _1"></span>omo <span class="_ _8"> </span>estrutura <span class="_ _9"> </span>de </div><div class="t m0 x1 h6 y10 ff4 fs4 fc0 sc0 ls0 ws0">amplifica&#231;&#227;o. </div><div class="t m0 x8 h7 y11 ff3 fs4 fc0 sc0 ls0 ws0">Palavras-Chave <span class="_ _8"> </span><span class="ff5">&#8212;</span> <span class="_ _8"> </span>Siste<span class="_ _0"></span>mas <span class="_ _8"> </span>&#243;pticos <span class="_ _8"> </span>de <span class="_ _a"> </span>alta <span class="_ _8"> </span>velocidade, </div><div class="t m0 x1 h7 y12 ff3 fs4 fc0 sc0 ls0 ws0">efici&#234;ncia <span class="_"> </span>espectral, <span class="_ _b"> </span>redes <span class="_"> </span>&#243;pti<span class="_ _1"></span>cas, <span class="_"> </span>filtragem <span class="_"> </span>&#243;<span class="_ _1"></span>ptica, <span class="_ _b"> </span>formatos <span class="_"> </span>de </div><div class="t m0 x1 h7 y13 ff3 fs4 fc0 sc0 ls0 ws0">modula&#231;&#227;o. </div><div class="t m0 x8 h6 y14 ff6 fs4 fc0 sc0 ls0 ws0">Abstract<span class="ff7">&#8212;<span class="ff4">In <span class="_ _6"> </span>this <span class="_ _6"> </span>w<span class="_ _1"></span>ork <span class="_ _6"></span>is <span class="_ _6"></span>presented <span class="_ _6"> </span>an <span class="_ _5"> </span>experimental <span class="_ _6"> </span>optical </span></span></div><div class="t m0 x1 h6 y15 ff4 fs4 fc0 sc0 ls0 ws0">transmission <span class="_ _c"> </span>at <span class="_ _c"> </span>3.58 <span class="_ _d"> </span>TB/s <span class="_ _c"> </span>using <span class="_ _c"> </span>32<span class="_ _1"></span> <span class="_ _c"> </span>channels <span class="_ _d"> </span>modula<span class="_ _0"></span>ted <span class="_ _e"> </span>at </div><div class="t m0 x1 h6 y16 ff4 fs4 fc0 sc0 ls0 ws0">112Gb/s <span class="_ _7"></span>w<span class="_ _1"></span>ith <span class="_ _7"></span>NRZ-<span class="ls3">DP</span>-QPSK<span class="_ _1"></span> <span class="_ _7"></span>modulation <span class="_ _7"></span>format <span class="_ _6"></span>w<span class="_ _1"></span>ith <span class="_ _7"></span>coherent </div><div class="t m0 x1 h6 y17 ff4 fs4 fc0 sc0 ls0 ws0">detection. <span class="_ _c"> </span>Optical <span class="_ _c"> </span>filtering <span class="_ _c"> </span>effects <span class="_ _c"> </span>i<span class="_ _1"></span>mposed<span class="_ _0"></span> <span class="_ _c"> </span>by <span class="_ _c"> </span>R<span class="_ _1"></span>OADMs <span class="_ _c"> </span>in </div><div class="t m0 x1 h6 y18 ff4 fs4 fc0 sc0 ls0 ws0">optical <span class="_ _4"></span>netw<span class="_ _1"></span>orks <span class="_ _4"></span>w<span class="_ _1"></span>ere <span class="_ _4"></span>analyzed. <span class="_ _7"></span>A <span class="_ _7"></span>maximum<span class="_ _0"></span> <span class="_ _7"></span>reach <span class="_ _7"></span>of <span class="_ _4"></span>40<span class="_ _1"></span>50 <span class="_ _4"></span>K<span class="_ _1"></span>m </div><div class="t m0 x1 h6 y19 ff4 fs4 fc0 sc0 ls0 ws0">was <span class="_ _2"> </span>obtained <span class="_ _2"> </span>in <span class="_ _2"> </span>a <span class="_ _2"> </span>p<span class="_ _1"></span>ure <span class="_ _3"> </span>silic<span class="_ _1"></span>a <span class="_ _3"> </span>fiber <span class="_ _2"> </span>r<span class="_ _1"></span>ecirculation <span class="_ _2"> </span>loop <span class="_ _2"> </span>using </div><div class="t m0 x1 h6 y1a ff4 fs4 fc0 sc0 ls0 ws0">EDFAs as amplification structure. </div><div class="t m0 x8 h7 y1b ff3 fs4 fc0 sc0 ls0 ws0">Keywords <span class="_"> </span><span class="ff5">&#8212;</span> <span class="_ _f"> </span>High <span class="_"> </span>speed <span class="_ _f"> </span>optical <span class="_"> </span>systems, <span class="_"> </span>spectral <span class="_"> </span>e<span class="_ _0"></span>fficiency, </div><div class="t m0 x1 h7 y1c ff3 fs4 fc0 sc0 ls0 ws0">optical networks, optical filtering, modulation formats. </div><div class="t m0 x9 h3 y1d ff1 fs1 fc0 sc0 ls5 ws0">I.<span class="ff8 ls0"> <span class="_ _10"> </span><span class="ff1 fs0"> <span class="fs1">I</span>NTRODU&#199;&#195;<span class="_ _0"></span>O<span class="fs1"> </span></span></span></div><div class="t m0 x8 h3 y1e ff1 fs1 fc0 sc0 ls0 ws0">The continuous development of <span class="_ _1"></span>media driven by <span class="_ _1"></span>the spr<span class="_ _1"></span>ead </div><div class="t m0 x1 h3 y1f ff1 fs1 fc0 sc0 ls0 ws0">of <span class="_ _f"> </span>the <span class="_ _f"> </span>I<span class="_ _1"></span>ntern<span class="_ _0"></span>et <span class="_ _f"> </span>and <span class="_ _f"> </span>its <span class="_ _f"> </span>applications <span class="_ _5"> </span>has <span class="_ _11"> </span>been <span class="_ _f"> </span>exerting <span class="_ _f"> </span>in <span class="_ _f"> </span>the </div><div class="t m0 x1 h3 y20 ff1 fs1 fc0 sc0 ls0 ws0">telecomm<span class="_ _0"></span>unications <span class="_ _b"> </span>network <span class="_ _3"> </span>a <span class="_ _3"> </span>co<span class="_ _1"></span>ntinuous<span class="_ _0"></span> <span class="_ _3"> </span>need <span class="_ _3"> </span>to <span class="_ _2"> </span>increase </div><div class="t m0 x1 h3 y21 ff1 fs1 fc0 sc0 ls0 ws0">capacity<span class="_ _0"></span> <span class="_ _12"> </span>[1]. <span class="_ _12"> </span>The <span class="_ _12"> </span>optic<span class="_ _0"></span>al <span class="_ _12"> </span>comm<span class="_ _0"></span>unication <span class="_ _12"> </span>sy<span class="_ _0"></span>stems <span class="_ _12"> </span>are </div><div class="t m0 x1 h3 y22 ff1 fs1 fc0 sc0 ls0 ws0">considere<span class="_ _0"></span>d <span class="_ _7"></span>the <span class="_ _7"></span>m<span class="_ _0"></span>ain <span class="_ _7"></span>soluti<span class="_ _0"></span>on <span class="_ _4"></span>for <span class="_ _7"></span>high <span class="_ _4"></span>speed <span class="_ _7"></span>data <span class="_ _4"></span>transm<span class="_ _0"></span>ission </div><div class="t m0 x1 h3 y23 ff1 fs1 fc0 sc0 ls0 ws0">capable <span class="_ _d"> </span>of <span class="_ _e"> </span>meeting <span class="_ _e"> </span>the <span class="_ _e"> </span>grow<span class="_ _0"></span>ing <span class="_ _e"> </span>demand <span class="_ _e"> </span>for <span class="_ _e"> </span>bandwidth; </div><div class="t m0 x1 h3 y24 ff1 fs1 fc0 sc0 ls0 ws0">howev<span class="_ _0"></span>er, <span class="_ _4"></span>for <span class="_ _1"></span>this, <span class="_ _1"></span>they <span class="_ _1"></span>foresee <span class="_ _1"></span>that <span class="_ _4"></span>techn<span class="_ _0"></span>ology <span class="_ _1"></span>will <span class="_ _1"></span><span class="ls6">go<span class="_ _1"></span></span> <span class="_ _1"></span>through </div><div class="t m0 x1 h3 y25 ff1 fs1 fc0 sc0 ls0 ws0">profound <span class="_ _c"> </span>changes<span class="ls7">. <span class="_ _c"> </span></span>In <span class="_ _c"> </span>recent <span class="_ _c"> </span>years <span class="_ _c"> </span>optical <span class="_ _d"> </span>netw<span class="_ _0"></span>orks <span class="_ _d"> </span>have </div><div class="t m0 x1 h3 y26 ff1 fs1 fc0 sc0 ls0 ws0">advanced <span class="_ _1"></span><span class="ls8">fro</span>m <span class="_ _1"></span>p<span class="_ _1"></span>oint <span class="_ _1"></span>to <span class="_ _1"></span>point <span class="_ _1"></span>systems <span class="_ _1"></span>with <span class="_ _1"></span>rates <span class="_ _1"></span>of <span class="_ _1"></span>2.5 <span class="_ _4"></span>Gb/s <span class="_ _1"></span><span class="ls9">to</span> </div><div class="t m0 x1 h3 y27 ff1 fs1 fc0 sc0 ls0 ws0">reconfigu<span class="_ _0"></span>rable opt<span class="_ _0"></span>ical netw<span class="_ _0"></span>orks up to 100 G<span class="_ _0"></span>b/s [2]<span class="ls7">. <span class="_ _0"></span><span class="ls0"> </span></span></div><div class="t m0 x8 h3 y28 ff1 fs1 fc0 sc0 ls0 ws0">The <span class="_"> </span>10 <span class="_"> </span>Gb/s <span class="_"> </span>optical <span class="_"> </span>transmis<span class="_ _0"></span>sion <span class="_"> </span>systems <span class="_"> </span>are <span class="_"> </span>based <span class="_"> </span>on </div><div class="t m0 x1 h3 y29 ff1 fs1 fc0 sc0 ls0 ws0">intensity<span class="_ _0"></span> <span class="_ _9"> </span>modulati<span class="_ _0"></span>on <span class="_ _9"> </span>(OOK), <span class="_ _8"> </span>but <span class="_ _8"> </span>with <span class="_ _8"> </span>the <span class="_ _9"> </span>advance<span class="_ _0"></span> <span class="_ _8"> </span>o<span class="_ _1"></span>f </div><div class="t m0 x1 h3 y2a ff1 fs1 fc0 sc0 ls0 ws0">transmis<span class="_ _0"></span>sion <span class="_ _a"> </span>rates, <span class="_ _8"> </span>the<span class="_ _0"></span> <span class="_ _8"> </span>spe<span class="_ _0"></span>ctral <span class="_ _a"> </span>occupation <span class="_ _a"> </span>nece<span class="_ _1"></span>ssary<span class="_ _0"></span> <span class="_ _8"> </span>to </div><div class="t m0 x1 h3 y2b ff1 fs1 fc0 sc0 ls0 ws0">maintain<span class="_ _0"></span> <span class="_ _5"> </span>the <span class="_ _6"></span>DW<span class="_ _1"></span>DM <span class="_ _5"> </span>(50 <span class="_ _6"></span>GHz) <span class="_ _5"> </span>grid <span class="_ _6"></span>require<span class="_ _0"></span>d <span class="_ _5"> </span>changes <span class="_ _6"></span>in <span class="_ _6"></span>the<span class="_ _1"></span> </div><div class="t m0 x1 h3 y2c ff1 fs1 fc0 sc0 ls0 ws0">structure<span class="_ _0"></span> <span class="_ _4"></span>of <span class="_ _1"></span>transmiss<span class="_ _0"></span>ion <span class="_ _4"></span>and <span class="_ _1"></span>reception<span class="_ _0"></span> <span class="_ _4"></span>in <span class="_ _1"></span>order <span class="_ _4"></span>to <span class="_ _1"></span>increase <span class="_ _1"></span>the </div><div class="t m0 x1 h3 y2d ff1 fs1 fc0 sc0 ls0 ws0">spectral<span class="_ _0"></span> <span class="_ _7"></span>efficien<span class="_ _0"></span>cy. <span class="_ _4"></span>I<span class="_ _1"></span>n <span class="_ _4"></span>this <span class="_ _4"></span>context, <span class="_ _7"></span>system<span class="_ _0"></span>s <span class="_ _4"></span>o<span class="_ _1"></span>f <span class="_ _4"></span>40 <span class="_ _7"></span>Gb/s <span class="_ _7"></span>sta<span class="_ _0"></span>rted </div><div class="t m0 x1 h3 y2e ff1 fs1 fc0 sc0 ls0 ws0">to operate, <span class="_ _1"></span>mostly<span class="_ _0"></span> <span class="_ _1"></span>with transmitters with<span class="_ _0"></span> <span class="_ _1"></span>phase <span class="_ _1"></span>modulati<span class="_ _0"></span>on <span class="_ _4"></span>an<span class="_ _0"></span>d </div><div class="t m0 x1 h3 y2f ff1 fs1 fc0 sc0 ls0 ws0">differenti<span class="_ _0"></span>al encoding w<span class="_ _0"></span>ith tw<span class="_ _0"></span>o bits per sym<span class="_ _0"></span>bol (DQPSK), w<span class="_ _0"></span>hile </div><div class="t m0 x1 h3 y30 ff1 fs1 fc0 sc0 ls0 ws0">the <span class="_ _2"> </span>recepti<span class="_ _0"></span>on <span class="_ _2"> </span>structure <span class="_ _3"> </span>had <span class="_ _3"> </span>to <span class="_ _13"> </span>adjust <span class="_ _3"> </span>an <span class="_ _2"> </span>interferom<span class="_ _0"></span>eter <span class="_ _2"> </span>for </div><div class="t m0 x1 h3 y31 ff1 fs1 fc0 sc0 ls0 ws0">maintain<span class="_ _0"></span>ing <span class="_ _f"> </span>the <span class="_"> </span>recepti<span class="_ _0"></span>on <span class="_ _11"> </span>differenti<span class="_ _0"></span>al, <span class="_ _f"> </span>extracting <span class="_ _f"> </span>informati<span class="_ _0"></span>on </div><div class="t m0 x1 h3 y32 ff1 fs1 fc0 sc0 ls0 ws0">from <span class="_ _7"></span>the <span class="_ _5"> </span>phase <span class="_ _6"></span>diff<span class="_ _0"></span>erence <span class="_ _6"></span>betw<span class="_ _0"></span>een <span class="_ _6"></span>successive <span class="_ _6"></span>bits <span class="_ _6"></span>[3]. <span class="_ _6"></span>These </div><div class="t m0 x1 h3 y33 ff1 fs1 fc0 sc0 ls0 ws0">system<span class="_ _0"></span>s <span class="_ _1"></span>evolved from the <span class="_ _1"></span>spec<span class="_ _0"></span>tral efficiency 0.5 b/s/Hz (OOK) </div><div class="t m0 x1 h3 y34 ff1 fs1 fc0 sc0 ls0 ws0">for <span class="_ _4"></span>1b/s/Hz, <span class="_ _4"></span>making<span class="_ _0"></span> <span class="_ _4"></span>p<span class="_ _1"></span>ossible <span class="_ _4"></span>the <span class="_ _4"></span>transmission <span class="_ _4"></span>of <span class="_ _4"></span>signals <span class="_ _4"></span>at <span class="_ _4"></span>40 </div><div class="t m0 x1 h3 y35 ff1 fs1 fc0 sc0 lsa ws0">Gb<span class="ls0">/s DWDM grid<span class="_ _0"></span>. However, for system<span class="_ _0"></span>s operating<span class="_ _0"></span> at 100 Gb/s </span></div><div class="t m0 xa h3 y36 ff1 fs1 fc0 sc0 ls0 ws0">it <span class="_ _1"></span>is <span class="_ _4"></span>requir<span class="_ _0"></span>ed <span class="_ _1"></span>a <span class="_ _4"></span>spectral <span class="_ _1"></span>effici<span class="_ _0"></span>ency <span class="_ _1"></span>of <span class="_ _1"></span>2<span class="_ _1"></span>b/s/Hz <span class="_ _1"></span>to <span class="_ _4"></span>ensu<span class="_ _0"></span>re <span class="_ _4"></span>that <span class="_ _1"></span>the </div><div class="t m0 xa h3 y37 ff1 fs1 fc0 sc0 ls0 ws0">spectral <span class="_"> </span>components <span class="_ _b"> </span>fit <span class="_ _3"> </span>the <span class="_ _b"> </span>DW<span class="_ _1"></span>DM <span class="_ _b"> </span>grid. <span class="_ _3"> </span>For <span class="_"> </span>this <span class="_ _3"> </span>spectral<span class="_ _0"></span> </div><div class="t m0 xa h3 y38 ff1 fs1 fc0 sc0 ls0 ws0">efficiency<span class="_ _0"></span>, <span class="_ _6"></span>the <span class="_ _6"></span>current <span class="_ _7"></span>optical <span class="_ _7"></span>transmission<span class="_ _0"></span> <span class="_ _6"></span>systems <span class="_ _7"></span>are <span class="_ _6"></span>under </div><div class="t m0 xa h3 y39 ff1 fs1 fc0 sc0 ls0 ws0">developm<span class="_ _0"></span>ent <span class="_ _d"> </span>by <span class="_ _d"> </span>ad<span class="_ _1"></span>opting <span class="_ _d"> </span>a <span class="_ _d"> </span>modulation <span class="_ _d"> </span>form<span class="_ _0"></span>at <span class="_ _d"> </span>b<span class="_ _1"></span>ased <span class="_ _c"> </span>o<span class="_ _1"></span>n </div><div class="t m0 xa h3 y3a ff1 fs1 fc0 sc0 ls0 ws0">polarizati<span class="_ _0"></span>on <span class="_ _5"> </span>multiplexing<span class="_ _0"></span> <span class="_ _5"> </span>with <span class="_ _5"> </span>phase <span class="_ _5"> </span>modulation. <span class="_ _6"></span>The <span class="_ _5"> </span>use <span class="_ _5"> </span>of </div><div class="t m0 xa h3 y3b ff1 fs1 fc0 sc0 lsa ws0">DP<span class="ls0">-QPSK <span class="_ _d"> </span>modulati<span class="_ _0"></span>on <span class="_ _e"> </span>system<span class="_ _0"></span>s <span class="_ _e"> </span>leads <span class="_ _e"> </span>for <span class="_ _d"> </span>optical <span class="_ _d"> </span>coherent </span></div><div class="t m0 xa h3 y3c ff1 fs1 fc0 sc0 ls0 ws0">detecti<span class="_ _0"></span>on<span class="ls7">, </span>due the<span class="_ _0"></span> need to<span class="_ _0"></span> recover th<span class="_ _0"></span>e signal phas<span class="_ _0"></span>e. </div><div class="t m0 xb h3 y3d ff1 fs1 fc0 sc0 ls0 ws0">Through <span class="_ _6"></span>the <span class="_ _f"> </span>use <span class="_ _5"> </span>o<span class="_ _1"></span>f <span class="_ _5"> </span>polarization <span class="_ _5"> </span>multiplex<span class="_ _0"></span>ed <span class="_ _5"> </span>I<span class="_ _1"></span>Q <span class="_ _5"> </span>(PM-IQ) </div><div class="t m0 xa h3 y3e ff1 fs1 fc0 sc0 ls0 ws0">modulat<span class="_ _0"></span>ors <span class="_ _1"></span>in <span class="_ _4"></span>con<span class="_ _0"></span>junction <span class="_ _1"></span>with <span class="_ _1"></span>coherent detection <span class="_ _1"></span>mechanism<span class="_ _0"></span>, </div><div class="t m0 xa h3 y3f ff1 fs1 fc0 sc0 ls0 ws0">it <span class="_"> </span>becomes <span class="_"> </span>possible <span class="_"> </span>to <span class="_"> </span>transm<span class="_ _0"></span>it <span class="_"> </span>signals <span class="_"> </span>at <span class="_ _3"> </span>100 <span class="_"> </span>Gb/s <span class="_ _b"> </span>in <span class="_ _b"> </span>the </div><div class="t m0 xa h3 y40 ff1 fs1 fc0 sc0 ls0 ws0">DWDM <span class="_ _1"></span>grid. The <span class="_ _1"></span>use <span class="_ _1"></span>of <span class="_ _1"></span>coherent detecti<span class="_ _0"></span>on <span class="_ _1"></span>makes available <span class="_ _1"></span>in </div><div class="t m0 xa h3 y41 ff1 fs1 fc0 sc0 ls0 ws0">the <span class="_ _13"> </span>electrical <span class="_ _2"> </span>domain <span class="_ _13"> </span>all <span class="_ _13"> </span>the <span class="_ _13"> </span>optical <span class="_ _13"> </span>signal <span class="_ _2"> </span>characteristics.<span class="_ _0"></span> </div><div class="t m0 xa h3 y42 ff1 fs1 fc0 sc0 ls0 ws0">Because <span class="_ _7"></span>o<span class="_ _1"></span>f <span class="_ _6"></span>that <span class="_ _6"></span><span class="ls9">it <span class="_ _6"></span></span>is <span class="_ _6"></span>possible <span class="_ _7"></span>to<span class="_ _1"></span> <span class="_ _6"></span>use <span class="_ _6"></span>digital <span class="_ _7"></span>signal <span class="_ _6"></span>processi<span class="_ _0"></span>ng </div><div class="t m0 xa h3 y43 ff1 fs1 fc0 sc0 ls0 ws0">algorithm<span class="_ _0"></span>s to compensate for the linea<span class="_ _0"></span>r and nonlinear eff<span class="_ _0"></span>ects of </div><div class="t m0 xa h3 y44 ff1 fs1 fc0 sc0 ls0 ws0">the comm<span class="_ _0"></span>unication chann<span class="_ _0"></span>el [4]. </div><div class="t m0 xb h3 y45 ff1 fs1 fc0 sc0 ls0 ws0">This <span class="_"> </span>work <span class="_"> </span>presen<span class="_ _0"></span>ts <span class="_"> </span>the <span class="_"> </span>first<span class="_ _0"></span> <span class="_"> </span>experimental <span class="_"> </span>WDM <span class="_"> </span>optical </div><div class="t m0 xa h3 y46 ff1 fs1 fc0 sc0 ls0 ws0">transmis<span class="_ _0"></span>sion <span class="_ _f"> </span>at <span class="_"> </span>1<span class="_ _0"></span>12 <span class="_ _f"> </span>Gb/s <span class="_"> </span>re<span class="_ _0"></span>ported <span class="_ _f"> </span>in <span class="_ _f"> </span>Latin <span class="_ _f"> </span>America. <span class="_ _f"> </span>It <span class="_"> </span>al<span class="_ _0"></span>so </div><div class="t m0 xa h3 y47 ff1 fs1 fc0 sc0 ls0 ws0">show <span class="_ _9"> </span>the <span class="_ _9"> </span>structures <span class="_ _9"> </span>o<span class="_ _1"></span>f <span class="_ _9"> </span>the <span class="_ _9"> </span>DP<span class="_ _1"></span>-QPSK <span class="_ _9"> </span>transmitte<span class="_ _0"></span>r, <span class="_ _14"> </span>the </div><div class="t m0 xa h3 y48 ff1 fs1 fc0 sc0 ls0 ws0">recircula<span class="_ _0"></span>tion ring<span class="_ _0"></span>, the structu<span class="_ _0"></span>re of c<span class="_ _0"></span>oherent rece<span class="_ _0"></span>ption, as w<span class="_ _0"></span>ell as </div><div class="t m0 xa h3 y49 ff1 fs1 fc0 sc0 ls0 ws0">digital filte<span class="_ _0"></span>ring algorithm<span class="_ _0"></span>s developed for post-process<span class="_ _0"></span>ing of the </div><div class="t m0 xa h3 y4a ff1 fs1 fc0 sc0 ls0 ws0">signal. <span class="_"> </span>In <span class="_ _3"> </span><span class="lsb">a <span class="_ _3"> </span></span>ROADMs <span class="_ _3"> </span>optical <span class="_"> </span>network <span class="_ _b"> </span>based <span class="_ _3"> </span>scenario, <span class="_ _b"> </span>the </div><div class="t m0 xa h3 y1d ff1 fs1 fc0 sc0 ls0 ws0">range <span class="_ _6"></span>of <span class="_ _6"></span>systems <span class="_ _6"> </span>with <span class="_ _5"> </span>no <span class="_ _6"></span>filtering <span class="_ _6"></span>and <span class="_ _5"> </span>with<span class="_ _0"></span> <span class="_ _5"> </span>cascaded <span class="_ _6"></span>optical </div><div class="t m0 xa h3 y4b ff1 fs1 fc0 sc0 ls0 ws0">filters for 50 <span class="_ _1"></span>GHz and <span class="_ _1"></span>100 GHz <span class="_ _1"></span>are evaluated<span class="_ _0"></span>, <span class="_ _1"></span>and is <span class="_ _1"></span>presented </div><div class="t m0 xa h3 y4c ff1 fs1 fc0 sc0 ls0 ws0">the <span class="_ _13"> </span>feasibility <span class="_ _13"> </span>of <span class="_ _c"> </span>optic<span class="_ _0"></span>al <span class="_ _c"> </span>tra<span class="_ _0"></span>nsmission <span class="_ _13"> </span>of <span class="_ _c"> </span>32 <span class="_ _13"> </span>x <span class="_ _c"> </span>112 <span class="_ _13"> </span>Gb/<span class="_ _1"></span>s, </div><div class="t m0 xa h3 y4d ff1 fs1 fc0 sc0 ls0 ws0">defining th<span class="_ _0"></span>e lim<span class="_ _0"></span>its imposed<span class="_ _0"></span> by optical f<span class="_ _0"></span>iltering<span class="_ _0"></span> in each <span class="_ _0"></span>case. </div><div class="t m0 xc h3 y4e ff1 fs1 fc0 sc0 ls5 ws0">II.<span class="ff8 ls0"> <span class="_ _15"> </span><span class="ff1">E<span class="fs0">XPERIMENTAL<span class="_ _0"></span> <span class="fs1">S</span>ETUP<span class="fs1"> </span></span></span></span></div><div class="t m0 xb h3 y4f ff1 fs1 fc0 sc0 ls0 ws0">The <span class="_ _4"></span>optical <span class="_ _1"></span>system <span class="_ _4"></span>used <span class="_ _4"></span><span class="ls9">in</span> <span class="_ _4"></span>the <span class="_ _4"></span>experiment <span class="_ _4"></span>for <span class="_ _4"></span>transm<span class="_ _0"></span>itting </div><div class="t m0 xa h3 y50 ff1 fs1 fc0 sc0 ls0 ws0">32 <span class="_ _4"></span>DP-QPSK <span class="_ _4"></span>chann<span class="_ _0"></span>els <span class="_ _4"></span>modul<span class="_ _0"></span>ated <span class="_ _4"></span>at <span class="_ _4"></span>112 <span class="_ _4"></span>Gb/s <span class="_ _1"></span>is <span class="_ _4"></span>composed <span class="_ _1"></span>o<span class="_ _1"></span>f </div><div class="t m0 xa h3 y51 ff1 fs1 fc0 sc0 ls0 ws0">three blocks, as illust<span class="_ _0"></span>rated in Figu<span class="_ _0"></span>re 1. T<span class="_ _1"></span>he WDM sourc<span class="_ _0"></span>e of the </div><div class="t m0 xa h3 y52 ff1 fs1 fc0 sc0 ls0 ws0">first <span class="_ _1"></span>b<span class="_ _1"></span>lock, <span class="_ _4"></span>calle<span class="_ _0"></span>d <span class="_ _4"></span>Transm<span class="_ _0"></span>itter <span class="_ _4"></span>(Figure <span class="_ _4"></span>1a), <span class="_ _4"></span>cons<span class="_ _0"></span>ists <span class="_ _4"></span>of <span class="_ _1"></span>3<span class="_ _1"></span>1 <span class="_ _4"></span>DFB </div><div class="t m0 xa h3 y53 ff1 fs1 fc0 sc0 ls0 ws0">lasers, <span class="_ _7"></span>w<span class="_ _0"></span>hose <span class="_ _7"></span>channels <span class="_ _7"></span>in <span class="_ _7"></span>the <span class="_ _7"></span>ITU <span class="_ _7"></span>grid, <span class="_ _7"></span>varying <span class="_ _7"></span>between<span class="_ _0"></span> <span class="_ _7"></span>C2<span class="_ _1"></span>1 </div><div class="t m0 xa h3 y54 ff1 fs1 fc0 sc0 ls0 ws0">and <span class="_ _f"> </span>C60 <span class="_ _f"> </span>(except <span class="_ _f"> </span>C41). <span class="_ _5"> </span>T<span class="_ _1"></span>he <span class="_ _5"> </span>lasers <span class="_ _f"> </span>were <span class="_ _11"> </span>space<span class="_ _0"></span>d <span class="_ _f"> </span>at <span class="_ _f"> </span>100 <span class="_ _11"> </span>GHz </div><div class="t m0 xa h3 y55 ff1 fs1 fc0 sc0 ls0 ws0">from <span class="_ _6"></span>each <span class="_ _5"> </span>o<span class="_ _1"></span>ther <span class="_ _6"></span>and <span class="_ _f"> </span>had <span class="_ _5"> </span><span class="lsb">a <span class="_ _5"> </span></span>linewidth <span class="_ _6"></span>less <span class="_ _5"> </span>than <span class="_ _5"> </span>2 <span class="_ _5"> </span>MH<span class="_ _1"></span>z, <span class="_ _5"> </span>with </div><div class="t m0 xa h3 y56 ff1 fs1 fc0 sc0 ls0 ws0">polarizati<span class="_ _0"></span>on <span class="_ _4"></span>in<span class="_ _0"></span>dependent <span class="_ _1"></span>controll<span class="_ _0"></span>ers. <span class="_ _1"></span>T<span class="_ _1"></span>he <span class="_ _1"></span>channel <span class="_ _1"></span>C41 <span class="_ _1"></span>consists </div><div class="t m0 xa h3 y57 ff1 fs1 fc0 sc0 ls0 ws0">of a external c<span class="_ _0"></span>avity tu<span class="_ _0"></span>nable laser w<span class="_ _0"></span>ith linewidth bel<span class="_ _0"></span>ow 100 kHz </div><div class="t m0 xa h3 y58 ff1 fs1 fc0 sc0 ls0 ws0">and w<span class="_ _0"></span>ith polarizati<span class="_ _0"></span>on controll<span class="_ _0"></span>er<span class="lsc">. </span> </div><div class="t m0 xb h3 y59 ff1 fs1 fc0 sc0 ls0 ws0">All <span class="_ _1"></span>the <span class="_ _4"></span>lasers, <span class="_ _4"></span>inclu<span class="_ _0"></span>ding <span class="_ _4"></span>C41, <span class="_ _1"></span>are <span class="_ _4"></span>modulated <span class="_ _1"></span>with <span class="_ _4"></span>only <span class="_ _1"></span>one </div><div class="t m0 xa h3 y5a ff1 fs1 fc0 sc0 ls0 ws0">IQ <span class="_ _13"> </span>optical <span class="_ _c"> </span>m<span class="_ _0"></span>odulator. <span class="_ _c"> </span>F<span class="_ _0"></span>our <span class="_ _c"> </span>dist<span class="_ _0"></span>inct <span class="_ _13"> </span>electrical <span class="_ _13"> </span>NRZ <span class="_ _c"> </span>PRBS<span class="_ _0"></span> </div><div class="t m0 xa h3 y5b ff1 fs1 fc0 sc0 ls0 ws0">signals, <span class="_ _6"></span>operating<span class="_ _0"></span> <span class="_ _5"> </span>at <span class="_ _5"> </span>28Gb/s, <span class="_ _6"></span>and <span class="_ _5"> </span>with <span class="_ _5"> </span>amplitude <span class="_ _6"></span>o<span class="_ _1"></span>f <span class="_ _6"></span>7.0 <span class="_ _5"> </span>Vp<span class="ls6">p </span></div><div class="t m0 xa h3 y5c ff1 fs1 fc0 sc0 ls5 ws0">(2<span class="ls0">*V<span class="ff2">&#960;</span>) <span class="_ _e"> </span>are <span class="_ _e"> </span>used <span class="_ _e"> </span>to <span class="_ _16"> </span>modul<span class="_ _0"></span>ate <span class="_ _16"> </span>the <span class="_ _e"> </span>optical <span class="_ _e"> </span>channels. <span class="_ _d"> </span>The </span></div><div class="t m0 xa h3 y5d ff1 fs1 fc0 sc0 ls0 ws0">operatin<span class="_ _0"></span>g rate 28Gb/s <span class="_ _0"></span>considered the <span class="_ _0"></span>redundancy<span class="_ _0"></span> of 7% of FEC<span class="_ _0"></span> </div><div class="t m0 xa h3 y5e ff1 fs1 fc0 sc0 ls0 ws0">and <span class="_ _5"> </span>higher <span class="_ _f"> </span>layer <span class="_ _6"></span>protocols <span class="_ _5"> </span>[5]. <span class="_ _5"> </span>T<span class="_ _1"></span>he <span class="_ _5"> </span>optical <span class="_ _5"> </span>output <span class="_ _5"> </span>of <span class="_ _5"> </span>the <span class="_"> </span><span class="ls5">IQ<span class="_ _0"></span><span class="ls0"> </span></span></div><div class="t m0 xa h3 y5f ff1 fs1 fc0 sc0 ls0 ws0">modulat<span class="_ _0"></span>or <span class="_ _1"></span><span class="ls9">is</span> <span class="_ _1"></span>polariz<span class="_ _0"></span>ation <span class="_ _1"></span>mu<span class="_ _0"></span>ltiplexed by <span class="_ _1"></span>an optical coupler 1 <span class="_ _1"></span>x </div><div class="t m0 xa h3 y60 ff1 fs1 fc0 sc0 ls0 ws0">2, <span class="_ _f"> </span>to <span class="_ _5"> </span>form <span class="_ _f"> </span><span class="lsd">32 <span class="_ _f"> </span><span class="lse">DP</span></span>-QPSK <span class="_ _f"> </span>optical <span class="_ _5"> </span>channels <span class="_ _5"> </span>at <span class="_ _f"> </span>112 <span class="_ _f"> </span>Gb/s. <span class="_ _5"> </span>This </div><div class="t m0 xa h3 y61 ff1 fs1 fc0 sc0 ls0 ws0">optical <span class="_ _4"></span>sig<span class="_ _0"></span>nal <span class="_ _4"></span>is <span class="_ _4"></span>amplif<span class="_ _0"></span>ied <span class="_ _4"></span>by <span class="_ _4"></span>an <span class="_ _4"></span>EDFA <span class="_ _1"></span>with <span class="_ _4"></span>maxim<span class="_ _0"></span>um <span class="_ _4"></span>output </div><div class="c x1 y62 w2 h8"><div class="t m0 xd h2 y63 ff1 fs0 fc0 sc0 ls0 ws0">J&#250;lio <span class="_ _7"></span>C. <span class="_ _7"></span>R. <span class="_ _6"> </span>F. <span class="_ _7"></span>Oliveira, <span class="_ _7"></span>Reginaldo <span class="_ _7"></span>Silva, <span class="_ _7"></span>Adol<span class="_ _0"></span>fo <span class="_ _6"> </span>F. <span class="_ _7"></span>Herbster, <span class="_ _7"></span>Edson <span class="_ _7"></span>P.<span class="fc1 sc0"> </span></div><div class="t m0 x0 h2 y64 ff1 fs0 fc0 sc0 ls0 ws0">Silva, <span class="_ _5"> </span>Vitor <span class="_ _5"> </span>R. <span class="_"> </span>Be<span class="_ _0"></span>dotti, <span class="_"> </span>J<span class="_ _0"></span>&#250;lio <span class="_ _5"> </span>C. <span class="_"> </span>M<span class="_ _0"></span>. <span class="_"> </span>Diniz, <span class="_ _6"> </span>Eduardo <span class="_ _5"> </span>S. <span class="_"> </span>Rosa, <span class="_ _6"> </span>Ant&#244;nio <span class="_ _5"> </span>A.<span class="fc1 sc0"> </span></div><div class="t m0 x0 h2 y65 ff1 fs0 fc0 sc0 ls0 ws0">Juriollo <span class="_ _11"> </span>e <span class="_ _3"> </span>Alberto <span class="_ _11"> </span>Parad<span class="_ _1"></span>isi, <span class="_ _b"> </span>Ger&#234;ncia <span class="_ _b"> </span>de <span class="_ _b"> </span>Tecnolo<span class="_ _0"></span>gias <span class="_ _b"> </span>&#211;pticas, <span class="_ _b"> </span>Funda&#231;&#227;o<span class="fc1 sc0"> </span></div><div class="t m0 x0 h2 y66 ff1 fs0 fc0 sc0 ls0 ws0">CPqD, <span class="_ _7"></span>Campinas, <span class="_ _7"></span>Brasil, <span class="_ _7"></span>E-mails: <span class="_ _7"></span>{julioc, <span class="_ _6"> </span>rdsilva,<span class="_ _0"></span> <span class="_ _7"></span>adolfo, <span class="_ _7"></span>edsons, <span class="_ _6"> </span>vribeiro<span class="_ _0"></span>,<span class="fc1 sc0"> </span></div><div class="t m0 x0 h2 y67 ff1 fs0 fc0 sc0 ls0 ws0">diniz, eduardor<span class="_ _0"></span>, amauri, paradis<span class="_ _0"></span>i}@cpqd.com.br. </div></div></div><div class="pi" data-data='{"ctm":[1.611792,0.000000,0.000000,1.611792,0.000000,0.000000]}'></div></div> </body> </html>
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