In order to meet the higher requirements of the next generation optical access network for data transmission, a novel WDM optical access network architecture is proposed in this paper. Through the new design of remote node and optical signal amplification and combination module, the network can not only provide long distance transmission and broadcast service, but also have flexible scalability and optical fiber sharing protection function. These features make the network with good flexibility. Additional, it retains the merits of Rayleigh backscatter mitigation and shared-seeding light of upstream signals. Simulation results show that the network has good transmission performance.
KEY WORDS :long-haul transmission;optical access network;sharing protection;scalability;
RN节点的内部结构如图3所示,包含有一个光信号接收机、N个分布式反馈(Distributed Feedback,DFB)激光器、M个光信号放大与组合模块(Optical Signal Amplifier and Combination Module,OSACM)、一个相位调制器(Phase Modulator,PM)、一个AWG、一个CWDM和2个1×M光分路器。每个OSACM模块由2个CWDM、2个EDFA、一个光环形器、一个1×2光开关、一个AWG以及一个光功率监测仪组成。这M个OSACM模块不仅可以实现对上下行光信号的放大,同时还能将广播信号与下行信号相组合送入目标ONU。
图1
长距离传输光接入网架构
Fig.1
Long haul optical access network architecture
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