本文選題：WDM + 自適應均衡��； 參考：《電子科技大學》2017年碩士論文

【摘要】：為了滿足數據流量爆炸式的增長對通信系統(tǒng)的需求,現有的商用100G以太網逐漸地會被淘汰,400G以太網就是在這個背景下提出的下一代骨干網傳輸技術。目前正在商用的112Gbps偏振復用-正交相移鍵控(Polarization Division Multiplexing-Quadrature Phase Shift Keying,PDM-QPSK)傳輸系統(tǒng)結合了偏振復用以及高階調制技術,具有集成度高、頻譜資源利用率高等特點。在此基礎上,本文在研究400G組網技術時采用的是四載波4×112G的波分復用(Wavelength Division Multiplexing,WDM)實現方案,此方案繼承了100G網絡的優(yōu)點。此外隨著傳輸速率的提高以及傳輸距離的增加,光信號中的色散以及非線性效應將會逐漸累積,如果不采取相應的信號補償技術,將會大大限制光纖通信系統(tǒng)的傳輸容量。本文首先研究了光纖通信系統(tǒng)中的色散補償算法。為了補償光信號中的色散效應,通常在接收端使用自適應時域均衡器的方法進行補償。然而目前的數字信號處理(Digital Signal Processing,DSP)芯片處理能力無法處理高速率的400G信號,因此流水線結構的均衡器在高速率光纖通信系統(tǒng)中被大量使用。但是與此同時也給自適應均衡器帶來了時延,從而影響了均衡器的性能。為了研究反饋時延對自適應時域均衡器的影響,本文提出了采用數理統(tǒng)計在理論上對均衡器的性能進行分析的新方法。首先對均衡器的權值建立數學模型,然后得到均衡器抽頭系數的統(tǒng)計數據,進而對均衡器的性能進行分析。本文在此基礎上對常用的兩種自適應時域均衡算法即最小均方誤差以及恒模算法分別進行了分析與比較,研究內容既包括在不同的反饋時延下各種均衡器的收斂速度的比較,還包括對均衡器穩(wěn)定性的分析。另一方面,針對信道中的非線性效應,本文提出了結合高速數模轉換(Digitalto-Analog Converter,DAC)以及模數轉換(Analog-to-Digital Converter,ADC)技術研究頻譜整形技術對光纖通信系統(tǒng)中非線性效應容忍性的方法。本文使用時域有限脈沖響應(Finite Impulse Response,FIR)濾波器的實現方式,研究并比較了Nyquist,根升余弦脈沖(Root Raised Cosine,RRC),根M型脈沖(Root M-Shaped Pulse,RMP)以及多項式脈沖(Root Polynomial Pulse,RPP)四種不同的頻譜整形技術在統(tǒng)一的400G光纖傳輸系統(tǒng)中對非線性效應的容忍性。最后從DAC量化精度、DAC量化帶寬以及ADC采樣速率三個方面,開展了DAC和ADC限制對頻譜整形技術性能影響的分析。
[Abstract]:In order to meet the demand of communication system due to the explosive growth of data traffic, the existing commercial 100G Ethernet will be eliminated gradually, which is the next generation backbone network transmission technology proposed under this background. The 112Gbps polarization-multiplexing Division Multiplexing-Quadrature Phase Shift keying PDM-QPSK transmission system, which is now commercially available, combines polarization multiplexing and high-order modulation techniques, and has the advantages of high integration and high spectral resource utilization. On this basis, the implementation scheme of wavelength division multiplexing Division multiplexing WDM with four carriers 4 脳 112G is adopted in this paper, which inherits the advantages of 100G network. In addition, with the increase of transmission rate and transmission distance, the dispersion and nonlinear effects in optical signal will gradually accumulate. If the corresponding signal compensation technology is not adopted, the transmission capacity of optical fiber communication system will be greatly limited. In this paper, the dispersion compensation algorithm in optical fiber communication systems is studied. In order to compensate the dispersion effect in optical signals, adaptive time domain equalizer is usually used in the receiver. However, the current digital signal processing (DSP) chip can not process 400G signals at high speed, so pipelined equalizers are widely used in high rate optical fiber communication systems. But at the same time, it also brings time delay to the adaptive equalizer, which affects the performance of the equalizer. In order to study the effect of feedback delay on adaptive time domain equalizer, a new method is proposed to analyze the performance of the equalizer theoretically using mathematical statistics. First, the mathematical model of the equalizer's weight is established, then the statistical data of the equalizer's tap coefficient are obtained, and the performance of the equalizer is analyzed. In this paper, two kinds of adaptive time domain equalization algorithms, minimum mean square error (MSE) and constant modulus algorithm (CMA), are analyzed and compared respectively. The research includes the comparison of convergence rates of various equalizers under different feedback delay. An analysis of the stability of the equalizer is also included. On the other hand, in view of the nonlinear effect in the channel, this paper proposes a method to study the tolerance of spectrum shaping technology to nonlinear effects in optical fiber communication systems by combining high speed digitalto-Analog convertor DAC and Analog-to-Digital conversion ADCtechnology. In this paper, the implementation of finite Impulse response filter in time domain is presented. The tolerance of four different spectral shaping techniques, Nyquist, Root Raised Cosine Raised, Root M-Shaped Pulseus, and polynomial Pulse Root Polynomial RPP, to nonlinear effects in a unified 400G optical fiber transmission system is studied and compared. Finally, from three aspects of DAC quantization precision, quantization bandwidth and ADC sampling rate, the influence of DAC and ADC constraints on the performance of spectrum shaping technology is analyzed.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN929.11

【參考文獻】

相關期刊論文 前5條

1 許渤;郭群;譚敏;邱昆;;反饋時延對高速率光數字接收機時域均衡器影響的分析[J];光電子·激光;2015年11期

2 曹國亮;楊彥甫;王非;崔瀾濤;榮寧;谷健;姚勇;;基于擴展卡爾曼的PDM-16QAM偏振態(tài)和載波相位快速跟蹤[J];光學學報;2014年12期

3 程紅霞;;100G光傳輸技術及發(fā)展現狀[J];光通信技術;2014年04期

4 唐進;陳林;肖江南;;偏振復用QPSK相干光數字通信系統(tǒng)實驗研究[J];光電子.激光;2012年10期

5 蔡理金;;CMA算法盲均衡性能分析[J];通信技術;2011年12期

相關重要報紙文章 前2條

1 周紅衛(wèi);;超100G應用在即[N];通信產業(yè)報;2015年

2 逄丹;;400G部署正逢時[N];通信產業(yè)報;2014年

相關博士學位論文 前2條

1 魯力;高速光纖通信系統(tǒng)中電子色散補償技術的研究[D];華中科技大學;2012年

2 周嫻;100Gbps PM-（D）QPSK相干光傳輸系統(tǒng)DSP算法研究[D];北京郵電大學;2011年

相關碩士學位論文 前4條

1 王愛紅;通信系統(tǒng)中盲均衡技術的研究[D];東北大學;2012年

2 陳俊曉;流水線結構模數轉換器設計與數字校正技術研究[D];浙江大學;2010年

3 朱海;100Gb/s PM-QPSK相干光接收機電域均衡算法的研究[D];北京郵電大學;2010年

4 馬偉富;自適應LMS算法的研究及應用[D];四川大學;2005年

，

本文編號：1973537