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无源光网络(PON)技术由于其低成本、高带宽、多业务接入等优点,成为业界公认的接入网解决方案。目前广泛应用的TDMA-PON网络体系安全性较差、系统容量小而无法成为下一代光接入网主导。由此本课题组提出了一种基于电域高速CDMA编解码的TDM-CDMA新型PON系统。此系统在下行方向使用TDM技术,在上行方向采用CDMA技术,因而具有CDMA的抗干扰性强,保密性好,安全性高等诸多优势。本文描述了TDM-CDMA PON的系统结构,并对TDM-CDMA PON中的新型码字同步技术进行了详细的阐述。
Passive Optical Network (PON) technology has become recognized as an access network solution in the industry due to its low cost, high bandwidth and multi-service access. Currently widely used TDMA-PON network system security is poor, the system capacity is small and can not become the leading generation of next-generation optical access network. Therefore, our group proposed a new type of TDM-CDMA PON system based on CDMA high-speed CDMA codec. This system uses TDM technology in the downlink direction and adopts CDMA technology in the uplink direction, thus having the advantages of strong anti-interference ability of CDMA, good confidentiality and high security. This paper describes the system structure of TDM-CDMA PON, and describes the new codeword synchronization technology in TDM-CDMA PON in detail.