Translated_NRZ_DP_QPSK_112G_(11Abr2011_8AM).rar_nrz_DP-QPSK

<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 SIMPÓSIO BRASILEIRO DE TELECOMUNICAÇÕES – SBrT’11, 02-05 DE OUTUBRO DE 2011, CURITIBA, 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 NRZ-DP-</div><div class="t m0 x4 h4 y4 ff1 fs2 fc0 sc0 ls0 ws0">QPSK Modulation Format over 4050 km in 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">Júlio C. R. F. Oliveira, Reginaldo Silva, Adolfo F. Herbster, Edson P. Silva, Vitor R. Bedotti, Júlio C. M. </div><div class="t m0 x7 h5 y7 ff1 fs3 fc0 sc0 ls0 ws0">Diniz, Eduardo S. Rosa, Antônio A. Juriollo e Alberto 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 - Neste trabalho é apresentada uma transmissão </div><div class="t m0 x1 h6 ya ff4 fs4 fc0 sc0 ls0 ws0">óptica experimental de 3,58 TB/s utilizando 32 canais modulados </div><div class="t m0 x1 h6 yb ff4 fs4 fc0 sc0 ls0 ws0">a 112 Gb/s com o uso do formato de modulação NRZ-DP-QPSK e </div><div class="t m0 x1 h6 yc ff4 fs4 fc0 sc0 ls4 ws0">detecção coerente. Os efeitos da filtragem óptica imposta pelos </div><div class="t m0 x1 h6 yd ff4 fs4 fc0 sc0 ls0 ws0">ROADMs em redes ópticas são analisados. Um alcance máximo </div><div class="t m0 x1 h6 ye ff4 fs4 fc0 sc0 ls0 ws0">de 4050 km é obtido em uma estrutura de propagação baseada </div><div class="t m0 x1 h6 yf ff4 fs4 fc0 sc0 ls0 ws0">em fibras de sílica pura e EDFAs como estrutura de </div><div class="t m0 x1 h6 y10 ff4 fs4 fc0 sc0 ls0 ws0">amplificação. </div><div class="t m0 x8 h7 y11 ff3 fs4 fc0 sc0 ls0 ws0">Palavras-Chave — Sistemas ópticos de alta velocidade, </div><div class="t m0 x1 h7 y12 ff3 fs4 fc0 sc0 ls0 ws0">eficiência espectral, redes ópticas, filtragem óptica, formatos de </div><div class="t m0 x1 h7 y13 ff3 fs4 fc0 sc0 ls0 ws0">modulação. </div><div class="t m0 x8 h6 y14 ff6 fs4 fc0 sc0 ls0 ws0">Abstract—In this work is presented an experimental optical </div><div class="t m0 x1 h6 y15 ff4 fs4 fc0 sc0 ls0 ws0">transmission at 3.58 TB/s using 32 channels modulated at </div><div class="t m0 x1 h6 y16 ff4 fs4 fc0 sc0 ls0 ws0">112Gb/s with NRZ-DP-QPSK modulation format with coherent </div><div class="t m0 x1 h6 y17 ff4 fs4 fc0 sc0 ls0 ws0">detection. Optical filtering effects imposed by ROADMs in </div><div class="t m0 x1 h6 y18 ff4 fs4 fc0 sc0 ls0 ws0">optical networks were analyzed. A maximum reach of 4050 Km </div><div class="t m0 x1 h6 y19 ff4 fs4 fc0 sc0 ls0 ws0">was obtained in a pure silica fiber recirculation loop 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 — High speed optical systems, spectral efficiency, </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. INTRODUÇÃO </div><div class="t m0 x8 h3 y1e ff1 fs1 fc0 sc0 ls0 ws0">The continuous development of media driven by the spread </div><div class="t m0 x1 h3 y1f ff1 fs1 fc0 sc0 ls0 ws0">of the Internet and its applications has been exerting in the </div><div class="t m0 x1 h3 y20 ff1 fs1 fc0 sc0 ls0 ws0">telecommunications network a continuous need to increase </div><div class="t m0 x1 h3 y21 ff1 fs1 fc0 sc0 ls0 ws0">capacity [1]. The optical communication systems are </div><div class="t m0 x1 h3 y22 ff1 fs1 fc0 sc0 ls0 ws0">considered the main solution for high speed data transmission </div><div class="t m0 x1 h3 y23 ff1 fs1 fc0 sc0 ls0 ws0">capable of meeting the growing demand for bandwidth; </div><div class="t m0 x1 h3 y24 ff1 fs1 fc0 sc0 ls0 ws0">however, for this, they foresee that technology will go through </div><div class="t m0 x1 h3 y25 ff1 fs1 fc0 sc0 ls0 ws0">profound changes. In recent years optical networks have </div><div class="t m0 x1 h3 y26 ff1 fs1 fc0 sc0 ls0 ws0">advanced from point to point systems with rates of 2.5 Gb/s to </div><div class="t m0 x1 h3 y27 ff1 fs1 fc0 sc0 ls0 ws0">reconfigurable optical networks up to 100 Gb/s [2]. </div><div class="t m0 x8 h3 y28 ff1 fs1 fc0 sc0 ls0 ws0">The 10 Gb/s optical transmission systems are based on </div><div class="t m0 x1 h3 y29 ff1 fs1 fc0 sc0 ls0 ws0">intensity modulation (OOK), but with the advance of </div><div class="t m0 x1 h3 y2a ff1 fs1 fc0 sc0 ls0 ws0">transmission rates, the spectral occupation necessary to </div><div class="t m0 x1 h3 y2b ff1 fs1 fc0 sc0 ls0 ws0">maintain the DWDM (50 GHz) grid required changes in the </div><div class="t m0 x1 h3 y2c ff1 fs1 fc0 sc0 ls0 ws0">structure of transmission and reception in order to increase the </div><div class="t m0 x1 h3 y2d ff1 fs1 fc0 sc0 ls0 ws0">spectral efficiency. In this context, systems of 40 Gb/s started </div><div class="t m0 x1 h3 y2e ff1 fs1 fc0 sc0 ls0 ws0">to operate, mostly with transmitters with phase modulation and </div><div class="t m0 x1 h3 y2f ff1 fs1 fc0 sc0 ls0 ws0">differential encoding with two bits per symbol (DQPSK), while </div><div class="t m0 x1 h3 y30 ff1 fs1 fc0 sc0 ls0 ws0">the reception structure had to adjust an interferometer for </div><div class="t m0 x1 h3 y31 ff1 fs1 fc0 sc0 ls0 ws0">maintaining the reception differential, extracting information </div><div class="t m0 x1 h3 y32 ff1 fs1 fc0 sc0 ls0 ws0">from the phase difference between successive bits [3]. These </div><div class="t m0 x1 h3 y33 ff1 fs1 fc0 sc0 ls0 ws0">systems evolved from the spectral efficiency 0.5 b/s/Hz (OOK) </div><div class="t m0 x1 h3 y34 ff1 fs1 fc0 sc0 ls0 ws0">for 1b/s/Hz, making possible the transmission of signals at 40 </div><div class="t m0 x1 h3 y35 ff1 fs1 fc0 sc0 lsa ws0">Gb/s DWDM grid. However, for systems operating at 100 Gb/s </div><div class="t m0 xa h3 y36 ff1 fs1 fc0 sc0 ls0 ws0">it is required a spectral efficiency of 2b/s/Hz to ensure that the </div><div class="t m0 xa h3 y37 ff1 fs1 fc0 sc0 ls0 ws0">spectral components fit the DWDM grid. For this spectral </div><div class="t m0 xa h3 y38 ff1 fs1 fc0 sc0 ls0 ws0">efficiency, the current optical transmission systems are under </div><div class="t m0 xa h3 y39 ff1 fs1 fc0 sc0 ls0 ws0">development by adopting a modulation format based on </div><div class="t m0 xa h3 y3a ff1 fs1 fc0 sc0 ls0 ws0">polarization multiplexing with phase modulation. The use of </div><div class="t m0 xa h3 y3b ff1 fs1 fc0 sc0 lsa ws0">DP-QPSK modulation systems leads for optical coherent </div><div class="t m0 xa h3 y3c ff1 fs1 fc0 sc0 ls0 ws0">detection, due the need to recover the signal phase. </div><div class="t m0 xb h3 y3d ff1 fs1 fc0 sc0 ls0 ws0">Through the use of polarization multiplexed IQ (PM-IQ) </div><div class="t m0 xa h3 y3e ff1 fs1 fc0 sc0 ls0 ws0">modulators in conjunction with coherent detection mechanism, </div><div class="t m0 xa h3 y3f ff1 fs1 fc0 sc0 ls0 ws0">it becomes possible to transmit signals at 100 Gb/s in the </div><div class="t m0 xa h3 y40 ff1 fs1 fc0 sc0 ls0 ws0">DWDM grid. The use of coherent detection makes available in </div><div class="t m0 xa h3 y41 ff1 fs1 fc0 sc0 ls0 ws0">the electrical domain all the optical signal characteristics. </div><div class="t m0 xa h3 y42 ff1 fs1 fc0 sc0 ls0 ws0">Because of that it is possible to use digital signal processing </div><div class="t m0 xa h3 y43 ff1 fs1 fc0 sc0 ls0 ws0">algorithms to compensate for the linear and nonlinear effects of </div><div class="t m0 xa h3 y44 ff1 fs1 fc0 sc0 ls0 ws0">the communication channel [4]. </div><div class="t m0 xb h3 y45 ff1 fs1 fc0 sc0 ls0 ws0">This work presents the first experimental WDM optical </div><div class="t m0 xa h3 y46 ff1 fs1 fc0 sc0 ls0 ws0">transmission at 112 Gb/s reported in Latin America. It also </div><div class="t m0 xa h3 y47 ff1 fs1 fc0 sc0 ls0 ws0">show the structures of the DP-QPSK transmitter, the </div><div class="t m0 xa h3 y48 ff1 fs1 fc0 sc0 ls0 ws0">recirculation ring, the structure of coherent reception, as well as </div><div class="t m0 xa h3 y49 ff1 fs1 fc0 sc0 ls0 ws0">digital filtering algorithms developed for post-processing of the </div><div class="t m0 xa h3 y4a ff1 fs1 fc0 sc0 ls0 ws0">signal. In a ROADMs optical network based scenario, the </div><div class="t m0 xa h3 y1d ff1 fs1 fc0 sc0 ls0 ws0">range of systems with no filtering and with cascaded optical </div><div class="t m0 xa h3 y4b ff1 fs1 fc0 sc0 ls0 ws0">filters for 50 GHz and 100 GHz are evaluated, and is presented </div><div class="t m0 xa h3 y4c ff1 fs1 fc0 sc0 ls0 ws0">the feasibility of optical transmission of 32 x 112 Gb/s, </div><div class="t m0 xa h3 y4d ff1 fs1 fc0 sc0 ls0 ws0">defining the limits imposed by optical filtering in each case. </div><div class="t m0 xc h3 y4e ff1 fs1 fc0 sc0 ls5 ws0">II. EXPERIMENTAL SETUP </div><div class="t m0 xb h3 y4f ff1 fs1 fc0 sc0 ls0 ws0">The optical system used in the experiment for transmitting </div><div class="t m0 xa h3 y50 ff1 fs1 fc0 sc0 ls0 ws0">32 DP-QPSK channels modulated at 112 Gb/s is composed of </div><div class="t m0 xa h3 y51 ff1 fs1 fc0 sc0 ls0 ws0">three blocks, as illustrated in Figure 1. The WDM source of the </div><div class="t m0 xa h3 y52 ff1 fs1 fc0 sc0 ls0 ws0">first block, called Transmitter (Figure 1a), consists of 31 DFB </div><div class="t m0 xa h3 y53 ff1 fs1 fc0 sc0 ls0 ws0">lasers, whose channels in the ITU grid, varying between C21 </div><div class="t m0 xa h3 y54 ff1 fs1 fc0 sc0 ls0 ws0">and C60 (except C41). The lasers were spaced at 100 GHz </div><div class="t m0 xa h3 y55 ff1 fs1 fc0 sc0 ls0 ws0">from each other and had a linewidth less than 2 MHz, with </div><div class="t m0 xa h3 y56 ff1 fs1 fc0 sc0 ls0 ws0">polarization independent controllers. The channel C41 consists </div><div class="t m0 xa h3 y57 ff1 fs1 fc0 sc0 ls0 ws0">of a external cavity tunable laser with linewidth below 100 kHz </div><div class="t m0 xa h3 y58 ff1 fs1 fc0 sc0 ls0 ws0">and with polarization controller. </div><div class="t m0 xb h3 y59 ff1 fs1 fc0 sc0 ls0 ws0">All the lasers, including C41, are modulated with only one </div><div class="t m0 xa h3 y5a ff1 fs1 fc0 sc0 ls0 ws0">IQ optical modulator. Four distinct electrical NRZ PRBS </div><div class="t m0 xa h3 y5b ff1 fs1 fc0 sc0 ls0 ws0">signals, operating at 28Gb/s, and with amplitude of 7.0 Vpp </div><div class="t m0 xa h3 y5c ff1 fs1 fc0 sc0 ls5 ws0">(2*Vπ) are used to modulate the optical channels. The </div><div class="t m0 xa h3 y5d ff1 fs1 fc0 sc0 ls0 ws0">operating rate 28Gb/s considered the redundancy of 7% of FEC </div><div class="t m0 xa h3 y5e ff1 fs1 fc0 sc0 ls0 ws0">and higher layer protocols [5]. The optical output of the IQ </div><div class="t m0 xa h3 y5f ff1 fs1 fc0 sc0 ls0 ws0">modulator is polarization multiplexed by an optical coupler 1 x </div><div class="t m0 xa h3 y60 ff1 fs1 fc0 sc0 ls0 ws0">2, to form 32 DP-QPSK optical channels at 112 Gb/s. This </div><div class="t m0 xa h3 y61 ff1 fs1 fc0 sc0 ls0 ws0">optical signal is amplified by an EDFA with maximum output </div><div class="c x1 y62 w2 h8"><div class="t m0 xd h2 y63 ff1 fs0 fc0 sc0 ls0 ws0">Júlio C. R. F. Oliveira, Reginaldo Silva, Adolfo F. Herbster, Edson P. </div><div class="t m0 x0 h2 y64 ff1 fs0 fc0 sc0 ls0 ws0">Silva, Vitor R. Bedotti, Júlio C. M. Diniz, Eduardo S. Rosa, Antônio A. </div><div class="t m0 x0 h2 y65 ff1 fs0 fc0 sc0 ls0 ws0">Juriollo e Alberto Paradisi, Gerência de Tecnologias Ópticas, Fundação </div><div class="t m0 x0 h2 y66 ff1 fs0 fc0 sc0 ls0 ws0">CPqD, Campinas, Brasil, E-mails: {julioc, rdsilva, adolfo, edsons, vribeiro, </div><div class="t m0 x0 h2 y67 ff1 fs0 fc0 sc0 ls0 ws0">diniz, eduardor, amauri, paradisi}@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>