1、 1 摘要摘要 光纤通信系统具有带宽大、容量大、体积小、无电磁辐射，也不受外界干扰、保密 性好、传输距离远、可靠性高等优点，越来越多的通信系统开始使用光纤作为通信信道。 与传统的电缆相比， 光纤信道的误码率很低， 在现代通信系统中得到了越来越广泛的应用。 传统的纠错码由于受通信信道带宽的限制，对冗余位的数目有比较严格的限制，影响了纠 错码的纠错能力，而光纤通信信道的带宽很宽，完全可以通过给信源端的纠错码提供更多 的冗余位来提高其纠错性能，使信息能在信道存在干扰的情况下，只传送一次就能正确接 收。本文探讨了可应用于光纤通信系统中的多冗余 BCH 码的编码算法，使 BCH 编码器所形 成的前向纠错
2、码具有纠正随机错误和纠正较长的突发错误的能力。运用用线性反馈移位寄 存器实现 BCH 编码器电路设计，并用 EDA 技术对 BCH 码编码器进行仿真。 关键词关键词 光纤通信； BCH 码； 编码器； EDA 2 AbstractBecause optical fiber communication system has a large bandwidth, large capacity, light weight, no electromagnetic radiation, no the electromagnetic radiation interference, good secrecy
3、 distance transmission and high reliability advantages etc, more and more communication systems began to use optical fiber as a communication channel. Comparing with the traditional cable, optical fiber channel bit error rates is extremely low, and it has been applied more and more in the modern com
4、munication systems. The traditional ecc is limited by the communication channel bandwidth,so the number of redundancy has a close confinement,and the number of redundancy impacts the eccs error correction ability. However, optical fiber communication channel bandwidth is very wide. In this way, we c
5、an provide more redundants in the sourse terminal to enhance its correction performance, so that information can received correctly through just once transmission, though there are much interference existing in the channel. The many redundant BCH coding algorithm discussed in this paper can be appli
6、ed to the optical fiber communication system, and the ecc formed by BCH encoder has the ability of correcting random errors and correcting the longer proruption errors. In the end, I realized BCH encoder circuit design by using linear feedback shift register, and simulatd BCH code encoder with EDA technology. Keywords Optical fiber communication; BCH code; encoder; EDA 3 目目 录录 摘 要 1 ABSTRACT 2 第 1 章 绪 论 .4 1.1 本论文的背景和意义 4 1.2 本论文的主要内容和研究进展 4 第 2 章 数字光纤技术概论 5 2.1 光纤通信的应用前景5 2.2
