本文選題：密集波分復(fù)用 + 非線性效應(yīng)　； 參考：《南京郵電大學(xué)》2017年碩士論文

【摘要】：隨著密集波分復(fù)用(Dense Wavelength Division Multiplexing,DWDM)系統(tǒng)容量的不斷提升,四波混頻效應(yīng)(Four Wave Mixing,FWM)成為影響系統(tǒng)性能的主要因素之一,高效評(píng)估FWM效應(yīng)對(duì)DWDM系統(tǒng)性能的影響程度對(duì)此類系統(tǒng)的優(yōu)化設(shè)計(jì)越來(lái)越重要。本文圍繞四波混頻噪聲對(duì)大容量DWDM系統(tǒng)性能影響程度進(jìn)行了一些理論和仿真研究�？紤]到DWDM系統(tǒng)中的比特序列的隨機(jī)性、信道間脈沖走離效應(yīng)等多種因素的影響,詳細(xì)推導(dǎo)了八進(jìn)制幅度相位鍵控(8APSK)調(diào)制和八進(jìn)制差分移相鍵控(D8PSK)調(diào)制的色散管理DWDM系統(tǒng)四波混頻噪聲方差的半解析理論計(jì)算模型。并利用該公式進(jìn)行實(shí)例分析,計(jì)算結(jié)果表明,在給定的系統(tǒng)條件下,8APSK調(diào)制的中心信道的FWM容限雖比D8PSK差些,但當(dāng)同時(shí)考慮一些線性噪聲的影響時(shí),8APSK調(diào)制的中心信道的性能仍然優(yōu)于D8PSK調(diào)制的中心信道,這主要?dú)w于8APSK信號(hào)的星座圖有著相對(duì)較大歐拉距離的緣故。基于OptiSystem和Matlab軟件平臺(tái)協(xié)同仿真,搭建了一種評(píng)估四波混頻效應(yīng)對(duì)正交幅度調(diào)制(QAM)相干DWDM系統(tǒng)影響程度的非線性分離仿真模型,并利用該模型分析了中心信道的誤碼率(BER)、誤差向量幅度(EVM)與四波混頻噪聲大小之間的關(guān)系,比較了不同傳輸速率、信道數(shù)和信道間隔情況下,四波混頻噪聲對(duì)此類系統(tǒng)的影響程度。本文中所導(dǎo)出的適用于8APSK和D8PSK調(diào)制格式的四波混頻噪聲半解析理論計(jì)算模型以及評(píng)估四波混頻效應(yīng)對(duì)相干DWDM系統(tǒng)影響程度的非線性分離仿真模型都對(duì)加深四波混頻效應(yīng)對(duì)大容量DWDM系統(tǒng)性能的影響程度的認(rèn)識(shí)提供了一種新的思路。
[Abstract]:With the increasing capacity of dense wavelength Division Multiplexing (DWDM) system, four Wave mixing (FWM) has become one of the main factors affecting system performance. It is more and more important to evaluate the effect of FWM effect on the performance of DWDM systems. In this paper, the influence of four wave mixing noise on the performance of large capacity DWDM systems is studied in theory and simulation. Considering the randomness of bit sequences in DWDM system and the effect of pulse walking effect between channels, In this paper, the semi-analytical model of the noise variance of four-wave mixing in a dispersion-managed DWDM system with octal amplitude phase keying (8APSKK) modulation and octal differential phase-shift keying (D8PSK) modulation is derived in detail. The calculation results show that the FWM tolerance of the central channel modulated by 8APSK is worse than that of D8PSK under the given system conditions. But when some linear noise is considered at the same time, the performance of the central channel is still better than that of the D8PSK modulation, which is mainly due to the relatively large Euler distance of the constellation diagram of the 8APSK signal. Based on the collaborative simulation of OptiSystem and Matlab software platform, a nonlinear separation simulation model is established to evaluate the influence of four-wave mixing effect on QAM) coherent DWDM system. The relationship between the error rate (BER), error vector amplitude (EVM) of the central channel and the noise level of the four-wave mixing is analyzed, and the different transmission rates, the number of channels and the channel spacing are compared. The influence of four-wave mixing noise on this kind of system. The semi-analytical theoretical model of four-wave mixing noise for 8APSK and D8PSK modulation schemes and the nonlinear separation simulation model for evaluating the influence of four-wave mixing effect on coherent DWDM systems are derived in this paper. It provides a new way of thinking about the influence of frequency effect on the performance of large capacity DWDM system.
【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)：1873005