基于非线性传递函数的光调制格式识别方法
发布时间：2019-04-24 06:04
【摘要】：随着相干光通信技术的发展,越来越多的高级调制格式得到广泛使用。为了满足不同传输业务和网络升级需求,未来的光纤通信网络是异构的,同一网络中可能同时并存多种调制格式和速率的信号。因此调制格式识别技术对异构光纤网络的管理控制以及自适应光信号接收都有重要的价值。本论文围绕一种基于四波混频的全光信号调制格式识别器件展开了理论研究,首先证明了信号脉冲峰值功率随色散的变化与信号调制格式有关,其次基于光纤四波混频理论建立了器件的理论模型,利用了四波混频提供的非线性功率传输函数(NPTF)实现了脉冲峰值功率变化到输出端闲散光平均功率变化的映射,并针对不同调制格式研究了NPTF的优化方法,提高了PTF输出曲线的对比度以便于特征识别。在此基础上计算得到了十种常用的调制格式的上述特性曲线,采用简单的互相关算法和支持向量机算法实现了十种常用的调制格式的准确识别。此外,还对偏振复用信号的识别进行了研究。最后还讨论了不同速率信号调制格式的识别方法。本论文提出的识别方法无需任何先验信息,对信号速率无限制,适用于开关调制和高级调制格式信号以及CD和OSNR劣化的信号,系统仅采用低速的光探测器和普通光滤波器,无需精密的光谱分析和复杂的数据处理器件,具有结构简单,性价比高的优点。
[Abstract]:With the development of coherent optical communication technology, more and more advanced modulation formats are widely used. In order to meet the needs of different transmission services and network upgrading, the future optical fiber communication network is heterogeneous, and a variety of modulation formats and rate signals may coexist in the same network at the same time. Therefore, modulation format recognition technology has important value in the management and control of heterogeneous optical networks and adaptive optical signal reception. In this paper, a four-wave mixing-based all-optical signal modulation format recognition device is studied theoretically. Firstly, it is proved that the variation of the peak power of the signal pulse with dispersion is related to the signal modulation format. Secondly, based on the theory of fiber four-wave mixing, the theoretical model of the device is established. The nonlinear power transfer function (NPTF) provided by the four-wave mixing is used to realize the mapping of the change of pulse peak power to the average power change of idle light at the output end. The optimization method of NPTF is studied for different modulation formats, and the contrast of PTF output curve is improved to facilitate feature recognition. On this basis, the above-mentioned characteristic curves of ten common modulation formats are calculated, and the accurate recognition of ten common modulation formats is realized by using simple cross-correlation algorithm and support vector machine (SVM) algorithm. In addition, the recognition of polarization multiplexing signal is also studied. Finally, the recognition methods of modulation formats for different rate signals are discussed. The recognition method proposed in this paper does not require any prior information and has no limitation on the signal rate. It is suitable for switching modulation and advanced modulation format signals as well as for the degraded signals of CD and OSNR. The system only uses low-speed photodetectors and ordinary optical filters. Without the need for precise spectral analysis and complex data processing devices, it has the advantages of simple structure and high cost-to-performance ratio.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN929.1;TN761
本文编号：2464168
[Abstract]:With the development of coherent optical communication technology, more and more advanced modulation formats are widely used. In order to meet the needs of different transmission services and network upgrading, the future optical fiber communication network is heterogeneous, and a variety of modulation formats and rate signals may coexist in the same network at the same time. Therefore, modulation format recognition technology has important value in the management and control of heterogeneous optical networks and adaptive optical signal reception. In this paper, a four-wave mixing-based all-optical signal modulation format recognition device is studied theoretically. Firstly, it is proved that the variation of the peak power of the signal pulse with dispersion is related to the signal modulation format. Secondly, based on the theory of fiber four-wave mixing, the theoretical model of the device is established. The nonlinear power transfer function (NPTF) provided by the four-wave mixing is used to realize the mapping of the change of pulse peak power to the average power change of idle light at the output end. The optimization method of NPTF is studied for different modulation formats, and the contrast of PTF output curve is improved to facilitate feature recognition. On this basis, the above-mentioned characteristic curves of ten common modulation formats are calculated, and the accurate recognition of ten common modulation formats is realized by using simple cross-correlation algorithm and support vector machine (SVM) algorithm. In addition, the recognition of polarization multiplexing signal is also studied. Finally, the recognition methods of modulation formats for different rate signals are discussed. The recognition method proposed in this paper does not require any prior information and has no limitation on the signal rate. It is suitable for switching modulation and advanced modulation format signals as well as for the degraded signals of CD and OSNR. The system only uses low-speed photodetectors and ordinary optical filters. Without the need for precise spectral analysis and complex data processing devices, it has the advantages of simple structure and high cost-to-performance ratio.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN929.1;TN761
【参考文献】
相关期刊论文 前3条
1 卢智嘉;王现彬;李莉;李玉萍;江锋;刘振永;;高速光纤系统中光双二进制传输性能分析[J];光通信技术;2015年02期
2 唐进;陈林;肖江南;;偏振复用QPSK相干光数字通信系统实验研究[J];光电子.激光;2012年10期
3 彭勃;熊刚;;一种基于二次谱线生成的码速率识别方法[J];电讯技术;2010年03期
相关硕士学位论文 前2条
1 孙思民;基于四波混频的多功能全光信号性能监测与处理器件研究[D];华中科技大学;2013年
2 李丽;基于四波混频的全光色散监测器件的理论与设计方法研究[D];华中科技大学;2011年
，本文编号：2464168
本文链接：https://www.wllwen.com/kejilunwen/dianzigongchenglunwen/2464168.html
