作者：袁玉英¹, 张连俊¹, 袁慧祥², 李鑫磊¹, 罗永刚³

作者单位：1. 山东理工大学计算机科学与技术学院, 山东 淄博 255049;
2. 中国移动德州分公司, 山东 德州 253013;
3. 山东理工大学电气与电子工程学院, 山东 淄博 255049

关键词：光纤通信;5B6B编译码器;FPGA;Quartus II;模式交替;仿真测试

摘要：

为避免简单的二电平码对数字光纤通信系统传输的影响,设计适用于数字光纤通信系统的5B6B编译码器,实现对简单二电平码进行码型变换,保证传输的透明性。该设计利用码字数字和(WDS)进行编码码字的选择,采用正、负两种模式交替的方法,在保证平均误码增值系数最小的基础上,以6种码变换规则中的一种为例完成设计。该设计采用ＦＰＧＡ设计流程,运用Verilog HDL语言完成5B6B编译码器各个模块的设计,并在Quartus II软件上进行仿真测试。仿真结果表明:该设计功能正确,可根据需要实现不同码表中相应5B与6B码之间的转换,实现简单,应用灵活,并能减少数字码流中连0或连1的数目,减小基线漂移。

The design and test of 5B6B encoder/decoder based on FPGA

YUAN Yuying¹, ZHANG Lianjun¹, YUAN Huixiang², LI Xinlei¹, LUO Yonggang³

1. College of Computer Science and Technology, Shandong University of Technology, Zibo 255049, China;
2. China Mobile Dezhou Branch, Dezhou 253013, China;
3. School of Electrical and Electronic Engineering, Shandong University of Technology, Zibo 255049, China

Abstract: Designing the 5B6B encoder/decoder in the digital optical fiber communication system was to avoid the impact of the simple two-level code to the digital optical fiber communication system transmission. So that we can carry out the code type conversion to the simple two-level code to ensure transparent transmission. Based on considering the minimum average error multiplication factor, the design was performed taking one of the six kinds of code transformation rules for example,using WDS to select the encoding words, taking the mathod of the positive mode and the negative mode alternation. The design adopted the FPGA design process, used Verilog HDL language to complete the design of each module in the 5B6B encoder/decoder and employed Quartus II software for simulation test. The simulation results show that the functions of the design are correct and the conversion between the 5B code and the corresponding 6B code in the different code tables can be achieved according to the needs, so the design can be realized simply and applied flexibly. The design can also decrease the consecutive-zero or consecutive-one number in the digital stream and the baseline drift .

Keywords: optical fiber communication;5B6B encoder/decoder;FPGA;Quartus II;mode alternation;simulation test

2015, 41(10): 76-80  收稿日期: 2015-01-30;收到修改稿日期: 2015-03-27

基金项目: 2013年山东省淄博市科学技术发展计划项目(2013GG02104)

作者简介: 袁玉英(1979-),女,山东德州市人,讲师,硕士,主要从事光纤通信设备研究。

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