| Performance evaluation of modulation formats in 40×40-Gb/s WDM repeaterless transmission systems |
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| 引用本文： | 卢光山,徐坤,伍剑,林金桐.Performance evaluation of modulation formats in 40×40-Gb/s WDM repeaterless transmission systems[J].Chinese Optics Letters,2006(4). |
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| 作者姓名： | 卢光山 徐坤 伍剑 林金桐 |
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| 作者单位： | Key Laboratory of Optical Communication and Lightwave Technologies Ministry of Education Beijing University of Posts and Telecommunications，Beijing 100876，Key Laboratory of Optical Communication and Lightwave Technologies Ministry of Education，Beijing University of Posts and Telecommunications，Beijing 100876，Key Laboratory of Optical Communication and Lightwave Technologies Ministry of Education，Beijing University of Posts and Telecommunications，Beijing 100876，Key Laboratory of Optical Communication and Lightwave Technologies Ministry of Education，Beijing University of Posts and Telecommunications，Beijing 100876 |
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| 基金项目： | This work was supported by the National "863" Project of China under Grant No. 2003AA103930
the National Natural Science Foundation of China under Grant No. 60577033. |
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| 摘 要： | Transmission performance of six modulation formats is numerically compared in 40×40-Gb/s wavelength division multiplexing (WDM) repeaterless systems. The results indicate that return-to-zero differential phase shift keying (RZ-DPSK) (33% duty cycle) demonstrates the best performance among all the formats when the accumulated amplified spontaneous emission power (AASEP) is small. But with the increasing of AASEP, the superiority of RZ-DPSK transmission performance over the other five modulation formats is vanished. AASEP is justified to be the major source for the deterioration of the superiority.
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