APON接入系统在物理层传输上的关键技术研究

Research on the Key Technologies for APON Broad Band Access Systems in Physical Layer Transmission

以基于异步传送模式(ATM)的无源光网络(PON)基本结构为基础,阐述ATM PON(APON)宽带接入系统传输帧格式;对传输帧结构内信元构成机理进行了深入分析,并结合媒体接入控制协议(MAC)阐述带宽的动态分配;对基于APON宽带接入系统在物理层传输上的测距技术、突发模式同步技术、突发信号的收发技术和搅码技术进行讨论,同时提出设计的基本框架;APON系统在分光比为1∶32时,支持光分支级数可达3级,实现传输距离为20km的多业务、多速率接入。并指出了APON和EPON宽带接入系统待解决的主要问题。

Based on the basic model of asynchronus transfer made (ATM) passive optical network (APON), the transmitting frame format of APON was discussed. The mechanism of the composition of cells in the transmitting frame structure was analyzed in the terms of the MAC protocol. Several technologies such as ranging of APON systems in the tier of physical transmission, burst mode synchronization, transceiving of burst signal and churning were discussed. The basic framework for the design is also proposed. Its supported optical branch order achieves 3 and can realize multi-service and multi-rate access that transmission distance can reach 20 km when the optical branching ratio of APON systems is 1:32. The main problems exist in APON and EPON broad-band access systems are pointed out at last.