NFDM路徑平均孤子信號傳輸系統(tǒng)的性能研究
發(fā)布時間：2018-11-07 15:22
【摘要】：隨著現代社會通信行業(yè)不斷進步,高清視頻通話及云計算的廣泛應用,網絡帶寬需求爆炸性地增長,因此提高現有骨干網的數據通信容量成了當務之急。相干光通信因其高傳輸速率和高靈敏度等優(yōu)點而備受關注,而光纖非線性再次成為限制光通信容量的瓶頸。近年來新提出的基于NFT的NFDM傳輸系統(tǒng),結合了孤子理論,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,帶來了很大的非線性,在實際應用中有風險。因此我們去除了拉曼放大器,提出一種路徑平均孤子的方法來保證同樣的效果,本文主要研究了改進的非線性頻分復用傳輸系統(tǒng),對其性能進行分析。本文首先簡要介紹了相干光通信技術的發(fā)展史,同時結合光纖非線性對相干光通信系統(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,強調研究NFDM傳輸系統(tǒng)的重要意義。還針對傳統(tǒng)NFDM傳輸系統(tǒng)使用拉曼放大器的缺點,提出了改進此系統(tǒng)的必要性。其次,對非線性傅里葉變換進行了定義。對傳統(tǒng)的帶拉曼放大器的NFDM信號傳輸系統(tǒng)中接收端的特征值接收性能進行了分析。對比傳統(tǒng)方案,提出改進NFDM信號傳輸系統(tǒng)的方法,一種路徑平均孤子的方法,即通過去除拉曼放大器,提高信號注入功率的方式,對其接收端的特征值接收性能也進行了分析。研究了不同計算NFT信號的算法下,系統(tǒng)誤碼率與采樣值的關系。最后,通過仿真分析了頻偏和激光器相位噪聲對改進NFDM信號傳輸系統(tǒng)性能的影響,結果證明系統(tǒng)對其影響具有魯棒性。接著,對改進系統(tǒng)中的兩個特征值進行QPSK調制,產生了兩類波形,并進行了檢測與分析。同時,對相位調制系統(tǒng)中的單特征值進行調制,并分析了信號發(fā)射功率波動和線寬變化對系統(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.
【學位授予單位】：南京郵電大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN929.1
本文編號：2316770
[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.
【學位授予單位】：南京郵電大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN929.1
【參考文獻】
相關期刊論文 前2條
1 陳健,溫揚敬,楊祥林;平均孤子在能量補償偏離時的自穩(wěn)定傳輸[J];光子學報;1998年05期
2 陳健，，楊祥林;平均孤子傳輸系統(tǒng)原理及其仿真[J];光通信研究;1996年03期
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