Research of Next Generation Passive Optical Network

对新一代无源光网络EPON和GPON的协议层次进行了比较,指出两者的主要差异在于采用了不同的第二层技术,即EPON采用以太网技术,GPON采用高效的传输汇聚层技术.并对EPON和GPON性能参数进行了分析,比较了两者在基本技术要求、传输复用方式、帧结构、承载业务、管理能力和生存性等方面的不同,及其各自的特点和优劣.最后,提出了通过两者的混合组网而达到优势互补,以实现“全业务”的接入.This paper analyzes the protocol stack structures of EPON and GPON,and points out their main difference lies in the Layer 2 techniques that EPON is based on Ethernet technology and GPON TC technology.The performance parameters of EPON and GPON,such as basic technical request,transmission multiplex mode,frame structure,bearing capacity,management and survivability,are compared with illustration for their own characteristics,strengths and weakness respectively.A new point is put forward that full services access will be supported by mixed networking mode of EPON and GPON