光在光纤中传输，能量会逐渐衰退，造成远距离信号的消失，因此就要对光在中间进行放大和提高光注入光纤的能力。

With light propagating in the optic fiber, energy will decline gradually and the remote signal will disappear. Thus, signal should be enlarged and the ability of light - coupling will be improved.

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数字直放站采用数字中频处理技术方式并通过光纤实现远距离信号传输，此对系统中的锁相源的相位噪声提出了很高的要求。

In digital repeater, the application of digital intermediate frequency technology and realization of optical fiber transmission for distance will require for little Phase Noise of Phase-Locked Source.

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制造方面的突破随后为更远距离的光纤信号传输铺平了道路。

Manufacturing breakthroughs then opened the way for moving signals over far greater distances.

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