Overlaying 10 Gb/s Legacy Optical Networks With 40 and 100 Gb/s Coherent Terminals

被引：7

作者：

Bertran-Pardo, Oriol ^{[1
]}

Renaudier, Jeremie ^{[1
]}

Charlet, Gabriel ^{[1
]}

Mardoyan, Haik ^{[1
]}

Patrice Tran ^{[1
]}

Salsi, Massimiliano ^{[1
]}

Bigo, Sebastien ^{[1
]}

机构：

[1] Alcatel Lucent Bell Labs, F-91620 Nozay, France

来源：

JOURNAL OF LIGHTWAVE TECHNOLOGY | 2012年 / 30卷 / 14期

关键词：

Binary phase shift keying (BPSK); coherent detection; digital signal processing; optical fiber communication; quadrature phase shift keying (QPSK); CROSS-PHASE MODULATION; TRANSMISSION-SYSTEMS; CARRIER PHASE; PDM-QPSK; EQUALIZATION; IMPAIRMENTS; LIMITATIONS; DISPERSION; RECEIVER; IMPACT;

D O I：

10.1109/JLT.2012.2198432

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

We report on the upgrade at 40 Gb/s and 100 Gb/s of deployed legacy optical networks originally designed for 10-Gb/s nonreturn to zero (NRZ) on-off keying (OOK) data. These networks operate on a 50 GHz grid and incorporate periodically modules to compensate for chromatic dispersion. We discuss here the insertion of coherent polarization-division-multiplexed (PDM)-quadrature phase shift keying (QPSK) and PDM-binary PSK (BPSK) channels in legacy optical systems based on low chromatic dispersion fibers. We first assess the nonlinear tolerance of PDM-QPSK paired with coherent detection as a function of the bit rate. We also investigate the effect of optimizing the power of the PDM-QPSK channels independently of the power of copropagating OOK channels as well as introducing guard bands in the multiplex. We particularly show that 40 Gb/s PDM-QPSK data suffer larger performance penalties from copropagating 10 Gb/s OOK channels than 100 Gb/s data. Finally, we demonstrate that PDM-BPSK is a more attractive solution than PDM-QPSK at the bit rate of 40 Gb/s. Our experiments reveal that the BPSK-based solution is about 7.5 dB more robust to cross nonlinearities than the QPSK-based solution when inserted in one wavelength slot with 50 GHz spacing, originally designed for NRZ-OOK channels at 10 Gb/s.

引用

页码：2367 / 2375

页数：9

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