题目内容
The transmission medium consists of an optical fiber cable and the receiver.
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The optical carrier is modulated by using neither an analog nor digital information signal.
With digital modulation, discrete changes in the light intensity are not obtained.
Analog modulation with an optical fiber communication system is more efficient, requiring a far lower signal to noise ratio at the receiver than digital modulation.
The input digital signal from the information source is not suitably encoded for optical transmission.
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