光域多址技术的分析

随着可见光通信技术等新兴光通信技术的迅速发展,针对光终端多用户接入的组网通信需求,对光域多址技术的研究逐渐显示出重要意义。目前,光域多址技术主要有光波分多址技术、光码分多址技术、光时分多址技术、副载波多址技术以及相应的混合多址技术。文章阐述了上述多址技术的基本原理、主要特点和应用方向,通过分析与对比各光域多址技术的性能,为光终端多用户接入通信系统多址技术的选取提供理论依据。同时,对光域多址技术的未来发展趋势做出展望。

A passive optical network based on optical code division multiplexing and time division multiple access technology

A passive optical network （PON） scheme based on optical code division multiplexing （OCDM） for the downstream traffics is proposed and analyzed in detail. In the PON, the downstream traffics are broadcasted by OCDM technology to guarantee the security, while the upstream traffics pass through the same optical fiber by the common time division multiple access （TDMA） technology to decrease the cost. This schemes are denoted as OCDM/TDMA-PON, which can be applied to an optical access network （OAN） with full services on demand, such as Internet protocol, video on demand, tele-presence and high quality audio. The proposed OCDM/TDMA-PON scheme combines advantages of PON, TDMA, and OCDM technology. Simulation results indicate that the designed scheme improves the OAN performance, and enhances flexibility and scalability of the system.