题目内容
The optical carrier is modulated by using neither an analog nor digital information signal.
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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.
保守秘密指在特殊的宴会情况下奉行沉默是金。
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