Research And Implement Of GPON System ONU TC Layer’s

In recent years, the technology of access network develops incessantly. At present, access network mostly includes xDSL, hybrid access technology, fiber access technology and wireless access technology. In the field of wired solutions, fiber access technology becomes the mainstream technology of access network step by step due to their bandwidth capacity and litter attenuation. Passive optical network (PON) is the fiber access technology that attracts the most attention. PON has experienced three modes, named APON, EPON and GPON. GPON holds the strongpoints which contain high efficiency, high speed, high bandwidth utilizing rate and support of whole service, therefore GPON is considered as the most advanced technology of PON.The technology character of GPON mainly shows on transmit and converge (TC) layer. Many key technologies are achieved on TC layer such as dynamic bandwidth assignment, coding and ranging. This dissertation focuses on the research and implement of GPON system ONU TC layer.At first the dissertation introduces the actuality and development of access network, three main kinds of passive optical networks such as APON, EPON and GPON; Secondly, from the definitions of GPON, thesis illuminate GPON’s standards, system structure, protocol model, multiplexing traffic mode and frame structure; then dissertation design the whole structural drawing of ONU transmit and converge layer, introduce the function of every module, and put forward the solution of TC layer; After detail analysis of every module, thesis simulate and implement the modules using Verilog HDL language on the development environment of Quartus II and synthesis these modules into top module,then add TimeQuest Timing Analyzer on the module,assign the pins,programme down on the develepmentkit and get the result on Logic Analyzer. At last, dissertation introduce the key technology of TC layer: Ranging, and show the solution method.