光纤已是长途干线的首选传输媒质。
Optic fiber is now the preferred transmission medium for long-haul trunks.
光纤传输也已成为当前通信，特别是干线通信的主要手段。
Optical fiber transmission has also become the major means of communication, particularly in the trunk communication network.
在系统主干线通道上采用光纤通信方式，对于分支通信采用屏蔽双绞线以RS-485方式通信，并对网络体系结构作了详细的描述。
Optical fiber communication mode is adopted in main channels, RS-485 communication mode using shielding twisted pair lines is employed in branch channels, and detailed descri…
因此无论是从目前干线网的需求，还是从长远的光纤到户的要求上来看，都需要探索、研究出性能优良，价格低廉的高速电光调制器。
Therefore, it is necessary to develop a kind of high-speed electro-optical modulator with low cost but good performance so as to meet the current need of route network and the future need of the FTTH.
因此无论是从目前干线网的需求，还是从长远的光纤到户的要求上来看，都需要探索、研究出性能优良，价格低廉的高速电光调制器。
Therefore, it is necessary to develop a kind of high-speed electro-optical modulator with low cost but good performance so as to meet the current need of route network and the future need of the FTTH.
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