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

【摘要】：為了滿足數(shù)據(jù)流量爆炸式的增長對通信系統(tǒng)的需求,現(xiàn)有的商用100G以太網(wǎng)逐漸地會被淘汰,400G以太網(wǎng)就是在這個(gè)背景下提出的下一代骨干網(wǎng)傳輸技術(shù)。目前正在商用的112Gbps偏振復(fù)用-正交相移鍵控(Polarization Division Multiplexing-Quadrature Phase Shift Keying,PDM-QPSK)傳輸系統(tǒng)結(jié)合了偏振復(fù)用以及高階調(diào)制技術(shù),具有集成度高、頻譜資源利用率高等特點(diǎn)。在此基礎(chǔ)上,本文在研究400G組網(wǎng)技術(shù)時(shí)采用的是四載波4×112G的波分復(fù)用(Wavelength Division Multiplexing,WDM)實(shí)現(xiàn)方案,此方案繼承了100G網(wǎng)絡(luò)的優(yōu)點(diǎn)。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(yīng)將會逐漸累積,如果不采取相應(yīng)的信號補(bǔ)償技術(shù),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(bǔ)償算法。為了補(bǔ)償光信號中的色散效應(yīng),通常在接收端使用自適應(yīng)時(shí)域均衡器的方法進(jìn)行補(bǔ)償。然而目前的數(shù)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(jié)構(gòu)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(shí)也給自適應(yīng)均衡器帶來了時(shí)延,從而影響了均衡器的性能。為了研究反饋時(shí)延對自適應(yīng)時(shí)域均衡器的影響,本文提出了采用數(shù)理統(tǒng)計(jì)在理論上對均衡器的性能進(jìn)行分析的新方法。首先對均衡器的權(quán)值建立數(shù)學(xué)模型,然后得到均衡器抽頭系數(shù)的統(tǒng)計(jì)數(shù)據(jù),進(jìn)而對均衡器的性能進(jìn)行分析。本文在此基礎(chǔ)上對常用的兩種自適應(yīng)時(shí)域均衡算法即最小均方誤差以及恒模算法分別進(jìn)行了分析與比較,研究內(nèi)容既包括在不同的反饋時(shí)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(yīng),本文提出了結(jié)合高速數(shù)模轉(zhuǎn)換(Digitalto-Analog Converter,DAC)以及模數(shù)轉(zhuǎn)換(Analog-to-Digital Converter,ADC)技術(shù)研究頻譜整形技術(shù)對光纖通信系統(tǒng)中非線性效應(yīng)容忍性的方法。本文使用時(shí)域有限脈沖響應(yīng)(Finite Impulse Response,FIR)濾波器的實(shí)現(xiàn)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(xiàng)式脈沖(Root Polynomial Pulse,RPP)四種不同的頻譜整形技術(shù)在統(tǒng)一的400G光纖傳輸系統(tǒng)中對非線性效應(yīng)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(gè)方面,開展了DAC和ADC限制對頻譜整形技術(shù)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(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN929.11

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