NFDM路径平均孤子信号传输系统的性能研究

发布时间：2018-11-07 15:22

【摘要】：随着现代社会通信行业不断进步,高清视频通话及云计算的广泛应用,网络带宽需求爆炸性地增长,因此提高现有骨干网的数据通信容量成了当务之急。相干光通信因其高传输速率和高灵敏度等优点而备受关注,而光纤非线性再次成为限制光通信容量的瓶颈。近年来新提出的基于NFT的NFDM传输系统,结合了孤子理论,几乎不受光纤非线性的影响,有望替代传统的WDM系统,提高光通信容量。传统的NFDM传输系统采用拉曼放大器,带来了很大的非线性,在实际应用中有风险。因此我们去除了拉曼放大器,提出一种路径平均孤子的方法来保证同样的效果,本文主要研究了改进的非线性频分复用传输系统,对其性能进行分析。本文首先简要介绍了相干光通信技术的发展史,同时结合光纤非线性对相干光通信系统通信容量的影响,介绍了新提出的基于NFT的NFDM传输系统的优点,强调研究NFDM传输系统的重要意义。还针对传统NFDM传输系统使用拉曼放大器的缺点,提出了改进此系统的必要性。其次,对非线性傅里叶变换进行了定义。对传统的带拉曼放大器的NFDM信号传输系统中接收端的特征值接收性能进行了分析。对比传统方案,提出改进NFDM信号传输系统的方法,一种路径平均孤子的方法,即通过去除拉曼放大器,提高信号注入功率的方式,对其接收端的特征值接收性能也进行了分析。研究了不同计算NFT信号的算法下,系统误码率与采样值的关系。最后,通过仿真分析了频偏和激光器相位噪声对改进NFDM信号传输系统性能的影响,结果证明系统对其影响具有鲁棒性。接着,对改进系统中的两个特征值进行QPSK调制,产生了两类波形,并进行了检测与分析。同时,对相位调制系统中的单特征值进行调制,并分析了信号发射功率波动和线宽变化对系统的影响。
[Abstract]:With the development of modern communication industry and the wide application of high-definition video call and cloud computing, the demand of network bandwidth increases explosively, so it is urgent to improve the data communication capacity of the existing backbone network. Coherent optical communication has attracted much attention because of its high transmission rate and high sensitivity, and the nonlinearity of optical fiber has once again become the bottleneck of limiting the capacity of optical communication. In recent years, a new NFDM transmission system based on NFT is proposed, which combines soliton theory and is almost independent of the nonlinear influence of optical fiber. It is expected to replace the traditional WDM system and improve the optical communication capacity. Raman amplifiers are used in traditional NFDM transmission systems, which bring great nonlinearity and are risky in practical applications. So we remove the Raman amplifier and propose a path average soliton method to guarantee the same effect. In this paper we mainly study the improved nonlinear frequency division multiplexing transmission system and analyze its performance. In this paper, the history of coherent optical communication technology is briefly introduced, and the advantages of the newly proposed NFDM transmission system based on NFT are introduced by considering the influence of fiber nonlinearity on the communication capacity of coherent optical communication system. The importance of studying NFDM transmission system is emphasized. Aiming at the disadvantage of using Raman amplifier in traditional NFDM transmission system, the necessity of improving the system is put forward. Secondly, the nonlinear Fourier transform is defined. The performance of eigenvalue reception in traditional NFDM signal transmission system with Raman amplifier is analyzed. Compared with the traditional scheme, the method of improving the NFDM signal transmission system, a path average soliton method, is proposed, that is, by removing the Raman amplifier and increasing the signal injection power, the characteristic value receiving performance of the receiver is also analyzed. The relationship between the bit error rate (BER) of the system and the sampling value under different algorithms for calculating NFT signals is studied. Finally, the effects of frequency offset and laser phase noise on improving the performance of NFDM signal transmission system are analyzed by simulation. The results show that the system is robust to the influence of the system. Then, the two eigenvalues in the improved system are modulated by QPSK, and two kinds of waveforms are generated, and the detection and analysis are carried out. At the same time, the single eigenvalue of the phase modulation system is modulated, and the influence of signal transmission power fluctuation and linewidth variation on the system is analyzed.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.1

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