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无源光纤元件的最大应用是短距离电话网及在局部闭路有线电话中的使用。与光纤带定相比，对这些系统的比特率要求通带不高。但是系统元件密集的特性限制了光能的大小。当采用光学网络系统取代以前使用的铜质系统时，费一效比就成了突出的问题。用光学元件取代电子器件要求使用?
The largest applications of passive optical components are the short-distance telephone network and the use in local closed-circuit landline telephones. Compared with the optical fiber band set, the bit rate of these systems requires pass band is not high. However, the density of system components limits the amount of light energy. When using the optical network system to replace the copper system used before, the cost-effectiveness has become a prominent issue. Optics to replace electronic devices require the use of?