RZ-DPSK光信号新型解调译码系统的设计与实现
发布时间：2018-08-29 11:11
【摘要】：从1966年英籍华人高锟发表的一篇论文开始,在短短的几十年间,光纤通信经历了从无到有、从低速到高速、从单波到合波、从短距到长距的飞跃式发展,而在当今世界的通信领域里,光纤通信几乎无处不在,互联网、电信网、广播电视网等都有着光纤通信的身影,并且它正朝着更快的速率、更大的容量、更远的距离大步迈进。随着光纤通信的不断发展,为了提高光纤传输的速率和保证传输质量,在无线通信领域应用成熟的调制解调技术开始相继出现在光纤通信中。目前,光纤通信最常用的调制技术是幅度调制和相位调制。强度调制在光纤通信的起步阶段应用普遍,但是随着WDM/DWDM网络的出现及发展,相位调制被广泛应用,DPSK、DQPSK等调制方式也相继被应用到了10Gbps、40Gbps甚至是100Gbps的光信号中。本文的主要内容是设计并实现了一种新型的RZ-DPSK解调译码系统,与普通的RZ-DPSK解调系统不同的是,本系统采用了SFP+光模块替代了平衡接收机,并且能够实现信号的精确解调并最终译码输出。首先,本文对DPSK相位调制解调的原理进行了阐述,分析了选取RZ-DPSK作为通用调制方式的原因。然后,介绍了系统的软硬件模块化设计原理、工作流程,并依次对各硬件模块和软件模块进行了描述。随后,重点介绍了基于数字平衡检测的光信号解调算法,该算法弥补了SFP+模块无法返回峰值检测电平的缺点,使得延迟干涉仪的调整能够快速准确。还介绍了基于Berlekamp-Massey迭代的BCH译码算法在FPGA中的实现,因为本系统采用了FPGA芯片为主要的处理计算芯片,该算法实现了实时线速纠错译码功能,满足高速信号的数据吞吐量需求。最后,通过现场实验对系统延迟干涉仪的解调精度、调整时间和解调质量进行了测试和对比,同时也对系统纠错性能进行了现场测试,实验证明了本系统的软件和硬件的稳定性和可靠性都是比较不错的。
[Abstract]:From a paper published in 1966 by Kao Kun, a British Chinese, in a short period of several decades, optical fiber communication has experienced a leap from scratch, from low speed to high speed, from single wave to combined wave, from short distance to long distance. In the field of communication in today's world, optical fiber communication almost everywhere, the Internet, telecommunications network, radio and television networks have optical fiber communication, and it is moving towards faster speed, larger capacity, longer distance stride. With the continuous development of optical fiber communication, in order to improve the transmission rate and ensure the transmission quality, mature modulation and demodulation techniques have been applied to the wireless communication field. At present, the most commonly used modulation techniques in optical fiber communication are amplitude modulation and phase modulation. Intensity modulation is widely used in the initial stage of optical fiber communication, but with the appearance and development of WDM/DWDM network, phase modulation has been widely used in optical signals of 10Gbps40 Gbps or even 100Gbps. The main content of this paper is to design and implement a new RZ-DPSK demodulation and decoding system. Different from ordinary RZ-DPSK demodulation system, this system uses SFP optical module instead of balanced receiver. And can realize the accurate demodulation of the signal and the final decoding output. Firstly, the principle of DPSK phase modulation and demodulation is described, and the reason why RZ-DPSK is chosen as the general modulation mode is analyzed. Then, the design principle and workflow of hardware and software are introduced, and each hardware module and software module are described in turn. Then, an optical signal demodulation algorithm based on digital balance detection is introduced, which makes up for the shortcoming that SFP module can not return peak detection level, which makes the adjustment of delay interferometer fast and accurate. This paper also introduces the implementation of BCH decoding algorithm based on Berlekamp-Massey iteration in FPGA, because the FPGA chip is used as the main processing chip in this system. The algorithm realizes the real-time line speed error correction decoding function and meets the data throughput requirement of high speed signal. Finally, the demodulation accuracy, adjusting time and demodulation quality of the system delay interferometer are tested and compared through field experiments. At the same time, the error correction performance of the system is also tested in the field. The experiment proves that the stability and reliability of the software and hardware are quite good.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN929.11;TN76
本文编号：2211029
[Abstract]:From a paper published in 1966 by Kao Kun, a British Chinese, in a short period of several decades, optical fiber communication has experienced a leap from scratch, from low speed to high speed, from single wave to combined wave, from short distance to long distance. In the field of communication in today's world, optical fiber communication almost everywhere, the Internet, telecommunications network, radio and television networks have optical fiber communication, and it is moving towards faster speed, larger capacity, longer distance stride. With the continuous development of optical fiber communication, in order to improve the transmission rate and ensure the transmission quality, mature modulation and demodulation techniques have been applied to the wireless communication field. At present, the most commonly used modulation techniques in optical fiber communication are amplitude modulation and phase modulation. Intensity modulation is widely used in the initial stage of optical fiber communication, but with the appearance and development of WDM/DWDM network, phase modulation has been widely used in optical signals of 10Gbps40 Gbps or even 100Gbps. The main content of this paper is to design and implement a new RZ-DPSK demodulation and decoding system. Different from ordinary RZ-DPSK demodulation system, this system uses SFP optical module instead of balanced receiver. And can realize the accurate demodulation of the signal and the final decoding output. Firstly, the principle of DPSK phase modulation and demodulation is described, and the reason why RZ-DPSK is chosen as the general modulation mode is analyzed. Then, the design principle and workflow of hardware and software are introduced, and each hardware module and software module are described in turn. Then, an optical signal demodulation algorithm based on digital balance detection is introduced, which makes up for the shortcoming that SFP module can not return peak detection level, which makes the adjustment of delay interferometer fast and accurate. This paper also introduces the implementation of BCH decoding algorithm based on Berlekamp-Massey iteration in FPGA, because the FPGA chip is used as the main processing chip in this system. The algorithm realizes the real-time line speed error correction decoding function and meets the data throughput requirement of high speed signal. Finally, the demodulation accuracy, adjusting time and demodulation quality of the system delay interferometer are tested and compared through field experiments. At the same time, the error correction performance of the system is also tested in the field. The experiment proves that the stability and reliability of the software and hardware are quite good.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN929.11;TN76
【参考文献】
相关期刊论文 前2条
1 惠战强;;全光归零(RZ)到非归零(NRZ)码型转换技术研究进展[J];激光与红外;2011年05期
2 王磊;裴丽;;光纤通信的发展现状和未来[J];中国科技信息;2006年04期
，本文编号：2211029
本文链接：https://www.wllwen.com/kejilunwen/dianzigongchenglunwen/2211029.html
