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光纤接入网(OAN)是指从交换机到用户之间的馈线段、配线段乃至引入线段部分或全部以光纤实现的接入手段.其传输方式分为无源(PON)和有源两种.前者采用无源光分路器,后者采用电复用器.但是,光纤接入网不是传统的光纤传输系统,而是针对接入环境设计的一种特殊的光纤传输系统.1.光纤接入网传输技术分类目前应用于接入网的光传输技术主要有3种.(1)光同步数字传输网(SDH)对于要求高质量高可靠性的大企事业用户,SDH技术将提供更为理想的网络性能和业务可靠性,还可以增加传输带宽;其丰富的开销使得接入网的网络管理和维护易于实现.SDH固有的灵活性使网络运营者可以更快更有效地提供用户所需的长期和短期业务,但是真正应用于接入网还要进行特殊的改造.(2)无源光网络(PON)无源光网络在接入网领域内是一种比较典型的传
Optical access network (OAN) refers to the access from the switch to the user feeder section, the distribution section and even the introduction of some or all of the optical fiber access means.The transmission is divided into passive (PON) and active two The former uses passive optical splitter, the latter using electrical multiplexer.However, optical access network is not a traditional optical fiber transmission system, but for the access environment designed a special optical fiber transmission system. Optical fiber access network transmission technology classification Currently applied to the access network optical transmission technologies are mainly three kinds: (1) Optical Synchronous Digital Transmission Network (SDH) SDH technology for large business users who require high quality and reliability More ideal network performance and business reliability, but also can increase the transmission bandwidth; its rich overhead makes the access network management and maintenance easy to achieve. SDH inherent flexibility allows network operators to provide users faster and more effectively Long-term and short-term business required, but the real application of the access network also make special transformation. (2) Passive optical network (PON) Passive optical network in access network is a kind of typical transmission