| 激光相位噪声对相干光纤通信系统性能的影响 |
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| 引用本文： | 刘继红. 激光相位噪声对相干光纤通信系统性能的影响[J]. 西安邮电学院学报, 2012, 17(5): 25-28 |
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| 作者姓名： | 刘继红 |
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| 作者单位： | 西安邮电大学电子工程学院,陕西西安,710121 |
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| 基金项目： | 陕西省教育厅科技计划资助项目 |
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| 摘 要： | 研究了激光相位噪声对相干光纤通信系统调制格式选择、参数优化和载波相位估计性能等的影响,仿真研究表明:对于16-QAM相干光纤通信系统,star型星座图中星点位置关系可以依据系统噪声特性优化,具有比square型星座图更大的激光相位噪声容限;经典的Viterbi-Viterbi载波相位估计方法用于相干光纤通信系统时,算法中对符号序列平均的最佳长度与激光相位噪声成反比;对于一定的目标误比特率,相干光接收机中A/D有效位数的大小与系统调制格式阶数和星座图特征基本无关。
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| 关 键 词： | 相干光纤通信 激光相位噪声 调制格式 载波相位估计 模数转换 |
The effects of laser phase noise on the performance of coherent optical fiber communication systems |
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| LIU Jihong. The effects of laser phase noise on the performance of coherent optical fiber communication systems[J]. Journal of Xi'an Institute of Posts and Telecommunications, 2012, 17(5): 25-28 |
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| Authors: | LIU Jihong |
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| Affiliation: | LIU Jihong (School of Electronic Engineering, Xi＇an University of Posts and Telecommunications, Xi＇an 710121, China) |
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| Abstract: | The negative effects of laser phase noise on the performance of carrier phase estimation and choosing optimized modulation formats for optical coherent communication systems are analyzed. Simulation results show that： For 16-QAM coherent optical fiber communication systems, star constellation has higher tolerance on laser phase noise than that of square constellation because the position of the points in star constellation can be changed according to the properties of system noises; the length of symbol blocks for averaging in the algorithm of Viterbi-Viterbi carrier phase estimation is inversely proportional to the value of laser phase noise; at a certain BER, the required bit number of analog-to-digital converters in optical coherent receivers does not depend on the modulation formats and their levels. |
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| Keywords: | coherent optical fiber communication laser phase noise modulation format carrierphase estimation analog-to-digital conversion |
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