發(fā)布時間：2019-05-17 08:49

【摘要】：近年來,互聯(lián)網(wǎng)、視頻點播、大數(shù)據(jù)、云計算等寬帶信息業(yè)務(wù)快速發(fā)展,各種通信業(yè)務(wù)對帶寬的需求呈指數(shù)方式增長,光纖傳輸網(wǎng)絡(luò)資源耗盡,傳統(tǒng)的10/40Gb/s 強度調(diào)制/直接檢測(IM/DD,intensity modulated direct detection)光通信系統(tǒng)已不能滿足現(xiàn)代通信業(yè)務(wù)的需求。雖然摻餌光纖放大器(EDFA)、波分復(fù)用(WDM)、密集波分復(fù)用(DWDM)等技術(shù)可以提升光通信系統(tǒng)容量,但其可發(fā)展空間已被挖掘殆盡,而傳輸網(wǎng)絡(luò)的重新部署需要很高的成本。因此,為滿足當(dāng)今社會寬帶信息業(yè)務(wù)的爆炸式增長對傳輸容量和頻譜效率的要求,基于高階調(diào)制碼型、相干檢測以及數(shù)字信號處理(DSP)技術(shù)的相干光通信系統(tǒng),成為超高速、超大容量光通信網(wǎng)絡(luò)研究的熱門。本文主要圍繞高階QAM調(diào)制碼型、相干檢測、電域?qū)崿F(xiàn)信號損傷補償?shù)认喔晒馔ㄐ畔到y(tǒng)關(guān)鍵技術(shù)展開深入研究,主要的研究成果有:1)研究了星形、方形、環(huán)形16QAM信號生成方案,提出一種環(huán)形16QAM信號生成方案并驗證了基于環(huán)形16QAM調(diào)制的相干光通信系統(tǒng)的性能,最后對比分析幾種信號生成方案的優(yōu)缺點。2)分析了相干檢測原理并探討了相干光通信系統(tǒng)中信號的各種損傷,搭建基于不同高階調(diào)制格式(QPSK、16QAM、64QAM)的相干光通信系統(tǒng),仿真得到損耗對不同系統(tǒng)的影響。3)研究了色散補償、偏振解復(fù)用、非線性補償、載波相位噪聲估計等數(shù)字信號處理算法,特別研究了幾種載波相位噪聲估計算法。搭建傳輸系統(tǒng),仿真實現(xiàn)了各補償算法對接收信號的有效補償。4)搭建基于方形 DP-16QAM 調(diào)制方式的 112Gbit/s、224Gbit/s、336Gbit/s 相干光通信系統(tǒng)并對系統(tǒng)性能進(jìn)行了研究。在FEC閾值3.8×10-3下,通過DSP補償技術(shù),分別仿真實現(xiàn)了 112Gbit/s、224Gbit/s DP-16QAM 信號 3520km、3100km的傳輸,并得到112Gbit/sDP-16QAM系統(tǒng)的最佳入纖功率為-1dBm。僅考慮光纖色散損傷與補償情況下,誤碼率容限為2×10~(-3)時,112Gb/s、224Gb/s、336Gb/s DP-16QAM 系統(tǒng)的可傳輸距離分別為 2400km、1700km、1150km。112Gbit/s DP-16QAM系統(tǒng),采用非線性補償與無非線性補償相比,誤碼率至少降低了一個數(shù)量級;僅考慮色散、非線性時,系統(tǒng)非線性最優(yōu)加權(quán)系數(shù)為1.9,最佳補償步長為60km;當(dāng)FEC閾值為3.8×10~(-3)時,與理論值相比,載波相位噪聲估計后系統(tǒng)僅存在3.2dB的信噪比代價。
[Abstract]:In recent years, broadband information services, such as the Internet, video-on-demand, big data, cloud computing and so on, have developed rapidly. The demand for bandwidth in various communication services has increased in an exponential manner, and the resources of optical fiber transmission networks have been exhausted. The traditional 10/40Gb/s intensity modulation / direct detection (IM/DD,intensity modulated direct detection) optical communication system) can no longer meet the needs of modern communication services. Although the optical communication system capacity can be improved by using (DWDM) and other technologies such as (EDFA), wavelength Division Multiplexing (WDM), dense wavelength Division Multiplexing optical fiber amplifier, its developable space has been excavated, and the redeployment of transmission network requires high cost. Therefore, in order to meet the requirements of transmission capacity and spectral efficiency for the explosive growth of broadband information services in today's society, the coherent optical communication system based on high-order modulation code type, coherent detection and digital signal processing (DSP) technology has become ultra-high speed. The research of super large capacity optical communication network is hot. In this paper, the key technologies of coherent optical communication system, such as high-order QAM modulation code type, coherent detection and signal damage compensation in electrical domain, are deeply studied. The main research results are as follows: 1) the star and square are studied. Ring 16QAM signal generation scheme, a ring 16QAM signal generation scheme is proposed and the performance of coherent optical communication system based on ring 16QAM modulation is verified. Finally, the advantages and disadvantages of several signal generation schemes are compared and analyzed. 2) the principle of coherent detection is analyzed and the damage of signals in coherent optical communication system is discussed, and different high-order modulation schemes (QPSK,16QAM,) are built. The influence of loss on different systems is obtained by simulation of 64QAM). 3) Digital signal processing algorithms such as dispersion compensation, polarization demultiplexing, nonlinear compensation, carrier phase noise estimation and so on are studied. In particular, several carrier phase noise estimation algorithms are studied. The transmission system is built, and the effective compensation of each compensation algorithm for the received signal is realized. 4) 112Gbit / s, 224Gbit / s, 336Gbit / s coherent optical communication system based on square DP-16QAM modulation is built, and the performance of the system is studied. Under the FEC threshold of 3.8 脳 10 脳 3, the transmission of 112Gbit / s, 224Gbit / s DP-16QAM signal 3520km and 3100km is realized by DSP compensation technology, and the optimum input power of 112Gbit/sDP-16QAM system is-1dBm. Considering only the dispersion damage and compensation of optical fiber, when the bit error rate tolerance is 2 脳 10 ~ (- 3), the transmission distances of 112GB / s, 224GB / s and 336GB / s DP-16QAM systems are 2400km, 1700km and 1150km.112Gbit / s DP-16QAM systems, respectively. Compared with the non-nonlinear compensation, the bit error rate (BER) is reduced by at least one order of magnitude. Considering dispersion only, the nonlinear optimal weighting coefficient of the system is 1.9 and the optimal compensation step size is 60km. when the dispersion is considered only, the nonlinear optimal weighting coefficient of the system is 1.9 and the optimal compensation step size is 60 km. When the FEC threshold is 3.8 脳 10 ~ (- 3), compared with the theoretical value, the signal-to-noise ratio (SNR) of 3.2dB exists in the system after carrier phase noise estimation.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN929.1

【參考文獻(xiàn)】

相關(guān)期刊論文 前2條

1 劉廷;李唐軍;鑒紀(jì)凱;;方形16QAM光信號生成方案的研究[J];信息通信;2016年12期

2 龔巖棟，陳士謙，，簡水生;相干光通信中的偏振問題[J];光通信技術(shù);1995年02期

相關(guān)博士學(xué)位論文 前1條

1 鐘康平;DP-16QAM相干光通信系統(tǒng)關(guān)鍵技術(shù)的研究[D];北京交通大學(xué);2014年

相關(guān)碩士學(xué)位論文 前3條

1 朱耀中;DP-QPSK相干光通信系統(tǒng)關(guān)鍵技術(shù)研究[D];北京交通大學(xué);2016年

2 富宇;QAM光信號相干檢測載波相位恢復(fù)的研究[D];北京交通大學(xué);2015年

3 趙曉歐;高速光纖通信系統(tǒng)中QAM光信號生成及傳輸性能研究[D];北京交通大學(xué);2013年

本文編號：2478961