在接入网层面,较之传统的铜缆接入技术,光纤接入技术有着覆盖范围广、传输距离远、带宽高、安全性高、建设维护成本低等优点,光纤正迅速成为网络接入层首选。光纤的带宽更大带宽是传输介质传送信息的能力的度量单位。普通光纤的光发射器一般都是LED(发光二极管),要求光纤在850nm的至少要达到200MHz的 Compared with the traditional copper access technology, optical access technology has the advantages of wide coverage, long transmission distance, high bandwidth, high security, low maintenance cost and so on. Compared with the traditional copper access technology, optical fiber is rapidly becoming a network access Layers preferred. Fiber Bandwidth Larger bandwidth is a measure of the ability of a transmission medium to transmit information. Ordinary fiber optic light emitters are generally LED (light-emitting diode), requiring at least 850nm fiber to reach 200MHz