本文關(guān)鍵詞： 光纖通信 相干檢測 DP-16QAM 數(shù)字信號處理 光纖非線性 載波相位噪聲估計與補(bǔ)償　出處：《北京交通大學(xué)》2014年博士論文　論文類型：學(xué)位論文

【摘要】：基于高階調(diào)制碼型、相干檢測和數(shù)字信號處理技術(shù)的相干光通信,由于其能夠?qū)崿F(xiàn)高頻譜效率、在電域?qū)崿F(xiàn)傳輸損傷補(bǔ)償?shù)葍?yōu)勢,成為下一代高速光通信系統(tǒng)發(fā)展方向。本論文結(jié)合國家863項(xiàng)目“160Gb/s一泵多纖光傳輸技術(shù)的研究”以及加拿大自然科學(xué)基金戰(zhàn)略基金項(xiàng)目‘'Digital signal processing for fiber optic communication",圍繞基于偏振復(fù)用16進(jìn)制正交幅度調(diào)制(DP-16QAM)碼型、相干檢測和數(shù)字信號處理技術(shù)的相干光通信系統(tǒng)進(jìn)行了深入的理論和實(shí)驗(yàn)研究。取得的主要研究成果如下： 1.提出一種改進(jìn)型四電平信號生成方案,實(shí)驗(yàn)生成了高質(zhì)量14Gbaud/s、28Gbaud/s、32Gbaud/s、40Gbaud/s四電平信號。實(shí)驗(yàn)研究了基于改進(jìn)型四電平信號生成方案的DP-16QAM發(fā)射機(jī)性能,實(shí)驗(yàn)結(jié)果顯示112Gb/s和224Gb/sDP-16QAM發(fā)射機(jī)性能與理論值分別僅有2.7dB和3.5dB的光信噪比(OSNR)代價。搭建了112Gb/s DP-16QAM實(shí)驗(yàn)傳輸系統(tǒng),實(shí)驗(yàn)研究了其傳輸性能。實(shí)驗(yàn)結(jié)果顯示,在僅補(bǔ)償光纖色散情況下單通道112Gb/s DP-16QAM傳輸系統(tǒng)最優(yōu)入纖功率點(diǎn)為-3.5dBm；當(dāng)前向糾錯編碼(FEC)閾值為3.8×10-時,實(shí)驗(yàn)實(shí)現(xiàn)了112Gb/sDP-16QAM信號1470km傳輸。 2.開發(fā)了一套完整的適用于DP-16QAM的相干接收機(jī)數(shù)字信號處理算法,其中包括基于Gram-Schmidt正交法則的IQ非正交補(bǔ)償算法；基于頻域均衡器的色散補(bǔ)償算法；數(shù)字時鐘恢復(fù)；偏振復(fù)用信號的偏振解復(fù)用及動態(tài)均衡；載波頻偏估計與補(bǔ)償；載波相位噪聲估計與補(bǔ)償；判決及誤碼計算。仿真及實(shí)驗(yàn)驗(yàn)證了整套數(shù)字信號處理算法的性能。首次實(shí)驗(yàn)研究了基于Gram-Schmidt正交法則的IQ非正交補(bǔ)償算法在DP-16QAM系統(tǒng)中的性能。 3.研究了基于數(shù)字反向傳輸(DBP:Digital Back-Propagation)的光纖非線性補(bǔ)償技術(shù)在DP-16QAM長距離相干光通信系統(tǒng)中的應(yīng)用。分析了偏振復(fù)用傳輸系統(tǒng)中的光纖非線性效應(yīng)。仿真與實(shí)驗(yàn)研究了該補(bǔ)償技術(shù)中加權(quán)系數(shù)及補(bǔ)償步長兩個關(guān)鍵參數(shù),結(jié)果顯示：對于特定的傳輸系統(tǒng),DBP的加權(quán)系數(shù)對補(bǔ)償步長、入纖功率、傳輸距離等均不敏感。在綜合考慮補(bǔ)償性能及計算復(fù)雜度情況下,DBP的最優(yōu)補(bǔ)償步長為傳輸系統(tǒng)的中繼距離。采用該補(bǔ)償技術(shù),112Gb/s DP-16QAM長傳輸系統(tǒng)的最優(yōu)入纖功率被提升了2dB；當(dāng)FEC閾值為3.8x10-時,實(shí)驗(yàn)實(shí)現(xiàn)了112Gb/s DP-16QAM信號2400km傳輸,最遠(yuǎn)傳輸距離比未采用該技術(shù)情況下提升近63%。 4.提出三種基于改進(jìn)型四相移鍵控分區(qū)算法(MP)的級聯(lián)載波相位噪聲估計(CPE)算法。研究了算法線寬容忍度、相位噪聲估計性能、線性及非線性傳輸性能和硬件復(fù)雜度。仿真與實(shí)驗(yàn)結(jié)果表明：三種算法性能均與相位盲搜索(BPS)算法相近,硬件復(fù)雜度卻比BPS算法分別降低了1.5-10倍。 5.為了進(jìn)一步降低硬件復(fù)雜度,提出一種基于準(zhǔn)零乘法器算法的級聯(lián)CPE算法。仿真與實(shí)驗(yàn)研究結(jié)果顯示：級聯(lián)CPE算法的線寬容忍度、相位噪聲估計性能、線性及非線性傳輸性能均與BPS算法相當(dāng),但該算法硬件復(fù)雜度比BPS算法降低了17倍,是迄今為止報道的針對16QAM調(diào)制碼型的硬件復(fù)雜度最低的前反饋級聯(lián)CPE算法。 6.提出將線性插值算法應(yīng)用于載波相位噪聲補(bǔ)償技術(shù)中,提出基于線性相位插值(LPI)的增強(qiáng)型載波相位噪聲補(bǔ)償算法,理論與實(shí)驗(yàn)研究了該補(bǔ)償算法性能。仿真與實(shí)驗(yàn)結(jié)果表明：LPI算法與滑動窗口(SW)補(bǔ)償算法性能相當(dāng),好于數(shù)據(jù)塊平均(BA)補(bǔ)償算法；然而LPI算法的硬件復(fù)雜度僅與BA算法相近,遠(yuǎn)遠(yuǎn)低于SW補(bǔ)償算法。
[Abstract]:High order modulation formats based on coherent optical communication coherent detection and digital signal processing technology, because it can achieve high spectral efficiency in electric domain to achieve transmission damage compensation and other advantages, become the development direction of next generation high speed optical communication system. This paper combined with the National 863 project "160Gb/s one pump multi fiber optical transmission technology study on" and the Canadian natural science fund fund project "'Digital signal processing strategy for fiber optic communication", focusing on polarization multiplexing 16 quadrature amplitude modulation (DP-16QAM) based on the code type, coherent optical communication system coherent detection and digital signal processing technology has been studied both theoretically and experimentally. The main research achievements are as follows:
1. proposed an improved four level scheme of signal generation, the generation of high quality 14Gbaud/s, 28Gbaud/s, 32Gbaud/s, 40Gbaud/s four level signal. Experimental study of DP-16QAM transmitter performance improved four level signal generation scheme based on the experimental results show that the optical signal-to-noise ratio of 2.7dB and 3.5dB were only 112Gb/s and 224Gb/sDP-16QAM transmitter performance with the theoretical value the price (OSNR). Set up the 112Gb/s DP-16QAM experimental transmission system, experimental study on the transmission performance. The experimental results show that the fiber dispersion compensation only single channel 112Gb/s DP-16QAM transmission system optimal input power is -3.5dBm; the forward error correction encoding (FEC) threshold is 3.8 * 10-, the implementation of the 112Gb/sDP-16QAM signal 1470km transmission.
2. the development of a complete set for DP-16QAM coherent receiver digital signal processing algorithm, including IQ non orthogonal compensation algorithm based on Gram-Schmidt orthogonal rule; dispersion compensation algorithm based on frequency domain equalizer; digital clock recovery; polarization multiplexing signal multiplexing and dynamic equilibrium; carrier frequency offset estimation and compensation; estimation and compensation carrier phase noise; judgment and error calculation. Simulation and experiment to verify the performance of the whole digital signal processing algorithm for the first time. The performance experiment of IQ non orthogonal compensation algorithm based on Gram-Schmidt orthogonal rule in DP-16QAM system.
3. the study of the transmission based on digital reverse (DBP:Digital Back-Propagation) of the optical fiber nonlinear compensation technology used in optical communication systems DP-16QAM long distance coherent analysis. The nonlinear effect of optical fiber polarization multiplexing transmission system. Simulation and Experimental Research on two key parameters, weighting coefficient and compensation step results showed: the compensation technology for transmission a specific system, the weighting coefficient DBP of compensation step, input power, transmission distance is not sensitive. The compensation performance and calculation considering the complexity under the condition of distance relay optimal compensation step DBP long transmission system. The compensation technology, 112Gb/s DP-16QAM long transmission system optimal input power is to enhance the 2dB; when the FEC threshold is 3.8x10-, experimental realization of the 112Gb/s DP-16QAM signal 2400km transmission, far transmission distance than not using the technology of lifting Near 63%.
4. proposed three improved four phase shift keying (MP) partition algorithm based on cascaded carrier phase noise estimation (CPE) algorithm. The algorithm of line tolerance degree, phase noise estimation, linear and nonlinear transmission performance and hardware complexity. Simulation and experimental results show that the three algorithms are search and performance blind phase (BPS) algorithm similar hardware complexity than BPS algorithm were decreased by 1.5-10 times.
5. in order to further reduce the hardware complexity, this paper proposes a cascaded CPE algorithm based on quasi zero multiplier algorithm. The results of simulation and experimental studies show that the cascade CPE algorithm line tolerance degree, phase noise estimation, linear and nonlinear transmission performance with BPS algorithm, but the algorithm hardware complexity than BPS algorithm reduces 17 times, is reported to date for the 16QAM modulation code the hardware complexity of the minimum feedback cascade CPE algorithm.
6. this paper presents the application of linear interpolation algorithm for carrier phase noise compensation technique, is proposed based on linear phase interpolation (LPI) enhanced carrier phase noise compensation algorithm, study the performance of the compensation algorithm in theory and experiment. The simulation and experimental results show that the LPI algorithm and sliding window (SW) is better than the performance of the compensation algorithm. The average data block (BA) compensation algorithm; however LPI algorithm hardware complexity and is similar to that of the BA algorithm is much lower than the SW compensation algorithm.

【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：TN929.1

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