基于OCDMA的无源光网络中信道噪声优化方法研究  

Research on Noise Optimization Methods in Passive Optical Network Based on OCDMA

作　　者：张琦[1] 杨保国[2] 王守源[3] 忻向军[1] 余重秀[1] 王葵如[1] 

机构地区：[1]北京邮电大学光通信与光波技术教育部重点实验室,北京100876 [2]河南省南阳信息工程学校,河南南阳474450 [3]信息产业部电信研究院泰尔实验室,北京100045

出　　处：《半导体光电》2008年第2期263-267,共5页Semiconductor Optoelectronics

基　　金：国家自然科学基金项目(60577045);教育部高等学校博士学科点基金项目(20050013002);电子科技大学宽带光纤传输与通信网技术教育部重点实验室开放课题

摘　　要：基于光码分复用(OCDMA)的无源光网络(PON)具有异步接入、带宽分配灵活、接入路由控制简单等优点而成为下一代PON的最佳候选方案之一。文章介绍了OCDMA-PON系统涉及的关键技术和亟待解决的技术问题,着重分析了利用MCD(丢失时片检测)、功率控制等消除远近效应和采用阈值判决、前向纠错、DPSK等改进噪声容限的方法,总结了其最新发展动态。Optical code division multiple access （OCDMA） is a preferable candidate technology for the next-generation passive optical network （PON） because of its distinct advantages such as asynchronous multiple access, flexible bandwidth assignment and its simplicity to provide access and routing operations in a common channel without switch. The key technique and the pending main problem for OCDMA-PON are presented. The methods of resolving the near-far effect are introduced through missing chip detection or power-leaving. Three solutions of improving noise margin are investigated, which are threshold technique, forward error correction and differential phase-shift keying. And their recent development is summarized.

关 键 词：光码分多址 远近效应 噪声容限 无源光网络 

分 类 号：TN762[电子电信—电路与系统]