光纤耦合器是一种定向耦合器，是光纤通信系统中重要器件之一。
Fiber coupler is a directional coupler that is crucial component for optical fiber communication systems.
从城市路网的优化改造、城市道路的合理定向和城市交通信号灯智能控制三个层面，系统的分析和讨论城市交通的优化改造与智能管理；
By three levels of the optimal modification in the traffic network, reasonable orientation of the roads and the intelligent management, we discuss and analyze the traffic problem in a system view.
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