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Advantages of Alternate Modulation Formats in 40Gb/s Transmission

机译:40Gb / s传输中替代调制格式的优势

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摘要

We analyzed linear and nonlinear properties of non-return-to-zero (NRZ), return-to-zero with 50% duty cycle (RZ50), return-to-zero with 33% duty cycle (RZ33), carrier-suppressed return-to-zero CSRZ, and differential phase shift keying (DPSK) modulation formats in order to predict the comparable advantages of their implementation in 40Gb/s WDM systems. We showed the advantage of RZ type formats over NRZ results from the trade off between better nonlinear tolerance and linear impairments such as inter-channel cross-talk and dispersion penalties. We estimated that in 40Gb/s 0.4 spectral efficiency WDM system on 10 100km spans of standard single mode fiber RZ33 format has Q value 1.5dB higher than NRZ. We also found that in a such system DPSK with controlled chip outperforms RZ33 by 0.8dB Q due to the difference in limiting nonlinear impairments and superior linear properties.
机译:我们分析了归零(NRZ),占空比为50%的归零(RZ50),占空比为33%的归零(RZ33),载波抑制归零的线性和非线性特性零CSRZ和差分相移键控(DPSK)调制格式,以预测其在40Gb / s WDM系统中实现的可比优势。我们展示了RZ类型格式优于NRZ类型的优势,这是因为在更好的非线性容忍度和线性损伤(例如通道间串扰和色散损失)之间进行了权衡。我们估计,在40 Gb / s 0.4频谱效率的WDM系统中,在10 100 km跨距的标准单模光纤RZ33格式中,Q值比NRZ高1.5dB。我们还发现,在这种系统中,由于受限的非线性损伤和出色的线性特性的差异,具有受控芯片的DPSK的性能优于RZ33 0.8dBQ。

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