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  本文關(guān)鍵詞：高階QAM光信號光纖傳輸非線性補償及載波相位恢復(fù)技術(shù)　出處：《哈爾濱工業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 光通信 非線性 反向傳輸算法 載波相位恢復(fù) 盲相位搜索算法 混合傳輸系統(tǒng)

【摘要】：由于最近幾年互聯(lián)網(wǎng)技術(shù)的發(fā)展,使得人們對帶寬的需求越來越高。原有的通信網(wǎng)絡(luò)不能滿足日益增長的帶寬需求,因此很多學(xué)者們把注意力放到高階QAM調(diào)制格式上。高階QAM調(diào)制格式充分利用振幅和相位攜帶信息,使得傳輸容量得到很大的提高。但是由于高階QAM調(diào)制格式具有濃密的星座點,容易受到非線性和相位噪聲的影響。為此,本文重點研究高階QAM調(diào)制格式非線性補償和載波相位恢復(fù)技術(shù)。本文先對光通信的發(fā)展以及存在的問題進(jìn)行回顧。介紹光通信系統(tǒng)的基本原理、基本結(jié)構(gòu)。從光通信基本原理出發(fā)用公式推導(dǎo)出發(fā)射端光信號調(diào)制和接收端相干檢測解調(diào)出光信號。描述了8QAM和16QAM這兩種調(diào)制信號的生成以及信號的特點。對差分編解碼技術(shù)做了具體的論述,利用仿真結(jié)果對比直接相位探測和差分解碼技術(shù)的優(yōu)缺點。本文對光纖鏈路中導(dǎo)致光信號損耗和畸變因素進(jìn)行討論,并相應(yīng)給出補償機(jī)制。在仿真鏈路中,采用反向傳輸算法對光纖非線性和色散進(jìn)行補償,針對不同鏈路仿真結(jié)果進(jìn)行比較,得出系統(tǒng)的最佳鏈路配置。同時論述不同算法參數(shù)對補償結(jié)果的影響,得出最佳補償效果的算法參數(shù)。本論文采用盲相位搜索算法對激光線寬造成的相位噪聲進(jìn)行恢復(fù)。研究不同激光線寬下,盲相位搜索算法恢復(fù)結(jié)果。計算接收機(jī)的線寬靈敏度。針對鏈路不同的OSNR值、線寬,對比采用盲相位搜索算法計算出的系統(tǒng)誤碼率,得出系統(tǒng)最佳的參數(shù)設(shè)置。為了在原有商用系統(tǒng)上增加傳輸容量,本論文提出了不同調(diào)制格式混合傳輸?shù)乃枷搿＠碚摲治霾煌诺篱g隔、發(fā)射功率對混合傳輸系統(tǒng)的影響。研究了不同信道間隔、發(fā)射功率下,OOK-16QAM,QPSK-16QAM混合系統(tǒng)中16QAM信道的傳輸性能。對比OOK-16QAM,QPSK-16QAM混合系統(tǒng)的傳輸性能。得出了在相同條件下,QPSK-16QAM混合系統(tǒng)的傳輸性能優(yōu)于OOK-16QAM混合系統(tǒng)的結(jié)論。
[Abstract]:Due to the development of Internet technology in recent years, the demand for bandwidth becomes higher and higher. The original communication network can not meet the growing demand for bandwidth. Therefore, many scholars pay attention to the high-order QAM modulation scheme, which makes full use of amplitude and phase to carry information. The transmission capacity is greatly improved, but because the high-order QAM modulation scheme has dense constellation points, it is easy to be influenced by nonlinear and phase noise. This paper focuses on the nonlinear compensation and carrier phase recovery techniques for high-order QAM modulation formats. Firstly, the development and problems of optical communication are reviewed, and the basic principle of optical communication system is introduced. Basic structure. Based on the basic principle of optical communication, the modulation of optical signal at the transmitter and the demodulation of the optical signal by coherent detection at the receiver are derived from the formula. The generation and the signal of the modulation signal 8QAM and 16QAM are described. The differential coding and decoding technology is discussed in detail. The advantages and disadvantages of direct phase detection and differential decoding are compared with the simulation results. In this paper, the loss and distortion factors of optical signal in optical fiber link are discussed, and the compensation mechanism is given. The inverse transmission algorithm is used to compensate the nonlinearity and dispersion of the fiber. The simulation results of different links are compared and the optimal link configuration of the system is obtained. At the same time, the influence of different algorithm parameters on the compensation results is discussed. In this paper, blind phase search algorithm is used to recover the phase noise caused by laser linewidth. The blind phase search algorithm is used to recover the result. The linewidth sensitivity of the receiver is calculated. The BER calculated by the blind phase search algorithm is compared for different OSNR values and linewidths of the link. In order to increase the transmission capacity in the original commercial system, this paper proposes the idea of mixed transmission with different modulation formats. The influence of transmission power on hybrid transmission system is studied. OOK-16QAM with different channel spacing and transmission power is studied. The transmission performance of 16QAM channel in QPSK-16QAM hybrid system is compared with that of OOK-16QAM QPSK-16QAM hybrid system. The transmission performance of QPSK-16QAM hybrid system is better than that of OOK-16QAM hybrid system.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN929.1

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本文編號：1356364