Chapter 12

Video Over Fiber Using AM Techniques



Amplitude modulation represents the simplest technique for encoding any type of signal. In a baseband system, the input signal directly modulates the strength of the transmitter output. In the RF carrier AM technique, a carrier, with a frequency much higher than the encoded information, varies according to the amplitude of the information being encoded. In a fiber optic system, the magnitude of the voltage input signal directly translates into a corresponding light intensity.

Basics of AM

We know that a video signal contains a range of levels from black to white that equals 140 IRE units. This IRE amount corresponds to 1.0 Vp-p. Thus, one IRE unit equals about 7.14 mVp-p. A picture containing ...

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