一种100 G EPON系统RS编码器设计与实现

Design and implementation of RS encoder for 100 G EPON system

提出了一种用于100 G以太网无源光网络(Ethernet Passive Optical Network,EPON)通信系统的里德-所罗门(Reed-Solomon,RS)编码器设计方法。100 G EPON通信系统由4个25 G EPON通信子系统组成,针对每一路25 G通信系统,采用纠错能力强、可靠性高的RS(1023,847)码组作为编码器的码型。根据编码器码组类型等参数,以及输入数据更新周期与位宽等特性,计算出编码电路的并行度。利用多路切换技术、数据并行化计算等高速设计技术,提出了一种可用于单通道的高速RS(1023,847)编码器设计方案。实际组网测试结果表明,设计的单通道RS(1023,847)编码器最高数据吞吐率可达25 Gbit/s,电路的最高时钟频率可达390.625 MHz,4路单通道编码器可实现最高数据吞吐率100 Gbit/s的RS编码,能够满足100 G EPON系统要求。

A Reed-Solomon(RS)encoder design method for 100 G ethernet passive optical network(EPON)communication systems is proposed.The 100 G EPON communication system consists of four 25 G EPON communication subsystems.For each 25 G communication system,RS(1023,847)code group with strong error correction ability and high reliability is adopted as the code type of the encoder.The parallelism of the encoding circuit is calculated according to the parameters such as the type of the encoder code set,the characteristics of the update period and bit width of the input data.A design scheme of high-speed RS(1023,847)encoder which can be used in a single channel is proposed by using high-speed design techniques such as multiplexing and data parallelization.The results of practical networking test show that the highest data throughput rate that the designed single-channel RS(1023,847)encoder can achieve is 25 Gbit/s,the highest clock frequency of the circuit can reach 390.625 MHz,and the highest data throughput rate that the four-way single-channel encoder can achieve for RS encoding is 100 Gbit/s,which can meet the requirements of 100 G EPON system.