QAM相干光通信系统关键技术研究
发布时间：2019-05-17 08:49
【摘要】：近年来,互联网、视频点播、大数据、云计算等宽带信息业务快速发展,各种通信业务对带宽的需求呈指数方式增长,光纤传输网络资源耗尽,传统的10/40Gb/s 强度调制/直接检测(IM/DD,intensity modulated direct detection)光通信系统已不能满足现代通信业务的需求。虽然掺饵光纤放大器(EDFA)、波分复用(WDM)、密集波分复用(DWDM)等技术可以提升光通信系统容量,但其可发展空间已被挖掘殆尽,而传输网络的重新部署需要很高的成本。因此,为满足当今社会宽带信息业务的爆炸式增长对传输容量和频谱效率的要求,基于高阶调制码型、相干检测以及数字信号处理(DSP)技术的相干光通信系统,成为超高速、超大容量光通信网络研究的热门。本文主要围绕高阶QAM调制码型、相干检测、电域实现信号损伤补偿等相干光通信系统关键技术展开深入研究,主要的研究成果有:1)研究了星形、方形、环形16QAM信号生成方案,提出一种环形16QAM信号生成方案并验证了基于环形16QAM调制的相干光通信系统的性能,最后对比分析几种信号生成方案的优缺点。2)分析了相干检测原理并探讨了相干光通信系统中信号的各种损伤,搭建基于不同高阶调制格式(QPSK、16QAM、64QAM)的相干光通信系统,仿真得到损耗对不同系统的影响。3)研究了色散补偿、偏振解复用、非线性补偿、载波相位噪声估计等数字信号处理算法,特别研究了几种载波相位噪声估计算法。搭建传输系统,仿真实现了各补偿算法对接收信号的有效补偿。4)搭建基于方形 DP-16QAM 调制方式的 112Gbit/s、224Gbit/s、336Gbit/s 相干光通信系统并对系统性能进行了研究。在FEC阈值3.8×10-3下,通过DSP补偿技术,分别仿真实现了 112Gbit/s、224Gbit/s DP-16QAM 信号 3520km、3100km的传输,并得到112Gbit/sDP-16QAM系统的最佳入纤功率为-1dBm。仅考虑光纤色散损伤与补偿情况下,误码率容限为2×10~(-3)时,112Gb/s、224Gb/s、336Gb/s DP-16QAM 系统的可传输距离分别为 2400km、1700km、1150km。112Gbit/s DP-16QAM系统,采用非线性补偿与无非线性补偿相比,误码率至少降低了一个数量级;仅考虑色散、非线性时,系统非线性最优加权系数为1.9,最佳补偿步长为60km;当FEC阈值为3.8×10~(-3)时,与理论值相比,载波相位噪声估计后系统仅存在3.2dB的信噪比代价。
[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.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.1
本文编号：2478961
[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.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.1
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