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光纤用户网沈国弟光纤通信的应用，是在市内电话局间作为中继线传送数字信号开始的，随着传输容量及中继距离的加大，又进入长途干线传输应用。与此同时，随着各种宽带业务的出现，用户要求信息种类增多，容量加大，而现有的用户网铜线电路由于频带窄、容量小、不易扩容等...
Fiber Optic Network Shen Guodie fiber optic communications applications, as the trunk in the city as a trunk to send digital signals began, with the transfer of capacity and increased trunk distance, but also into the long-distance trunk transmission applications. At the same time, with the advent of various broadband services, the number of types of information requested by users has increased and their capacity has been increased. However, existing subscriber network copper circuits have a narrow bandwidth, small capacity, and are not easily scalable.