【摘要】：隨著現(xiàn)代社會(huì)通信行業(yè)不斷進(jìn)步,高清視頻通話及云計(jì)算的廣泛應(yīng)用,網(wǎng)絡(luò)帶寬需求爆炸性地增長(zhǎng),因此提高現(xiàn)有骨干網(wǎng)的數(shù)據(jù)通信容量成了當(dāng)務(wù)之急。相干光通信因其高傳輸速率和高靈敏度等優(yōu)點(diǎn)而備受關(guān)注,而光纖非線性再次成為限制光通信容量的瓶頸。近年來(lái)新提出的基于NFT的NFDM傳輸系統(tǒng),結(jié)合了孤子理論,幾乎不受光纖非線性的影響,有望替代傳統(tǒng)的WDM系統(tǒng),提高光通信容量。傳統(tǒng)的NFDM傳輸系統(tǒng)采用拉曼放大器,帶來(lái)了很大的非線性,在實(shí)際應(yīng)用中有風(fēng)險(xiǎn)。因此我們?nèi)コ死糯笃?提出一種路徑平均孤子的方法來(lái)保證同樣的效果,本文主要研究了改進(jìn)的非線性頻分復(fù)用傳輸系統(tǒng),對(duì)其性能進(jìn)行分析。本文首先簡(jiǎn)要介紹了相干光通信技術(shù)的發(fā)展史,同時(shí)結(jié)合光纖非線性對(duì)相干光通信系統(tǒng)通信容量的影響,介紹了新提出的基于NFT的NFDM傳輸系統(tǒng)的優(yōu)點(diǎn),強(qiáng)調(diào)研究NFDM傳輸系統(tǒng)的重要意義。還針對(duì)傳統(tǒng)NFDM傳輸系統(tǒng)使用拉曼放大器的缺點(diǎn),提出了改進(jìn)此系統(tǒng)的必要性。其次,對(duì)非線性傅里葉變換進(jìn)行了定義。對(duì)傳統(tǒng)的帶拉曼放大器的NFDM信號(hào)傳輸系統(tǒng)中接收端的特征值接收性能進(jìn)行了分析。對(duì)比傳統(tǒng)方案,提出改進(jìn)NFDM信號(hào)傳輸系統(tǒng)的方法,一種路徑平均孤子的方法,即通過(guò)去除拉曼放大器,提高信號(hào)注入功率的方式,對(duì)其接收端的特征值接收性能也進(jìn)行了分析。研究了不同計(jì)算NFT信號(hào)的算法下,系統(tǒng)誤碼率與采樣值的關(guān)系。最后,通過(guò)仿真分析了頻偏和激光器相位噪聲對(duì)改進(jìn)NFDM信號(hào)傳輸系統(tǒng)性能的影響,結(jié)果證明系統(tǒng)對(duì)其影響具有魯棒性。接著,對(duì)改進(jìn)系統(tǒng)中的兩個(gè)特征值進(jìn)行QPSK調(diào)制,產(chǎn)生了兩類波形,并進(jìn)行了檢測(cè)與分析。同時(shí),對(duì)相位調(diào)制系統(tǒng)中的單特征值進(jìn)行調(diào)制,并分析了信號(hào)發(fā)射功率波動(dòng)和線寬變化對(duì)系統(tǒng)的影響。
[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.
【學(xué)位授予單位】：南京郵電大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN929.1

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本文編號(hào)：2316770