What are the problems with transmission of analog video signals over optical cable?
The conversion from an analog electrical signal to an optical signal and back has non-linear effects that distort analog video signals. It is difficult to compensate for these effects. Fiber also has attenuation that causes optical power to dim over longer distances. When the dimmed optical signal is converted back to an electrical signal, the voltage levels are too low. Amplifiers can compensate for the low voltage but also increase the noise, thereby reducing the signal-tonoise ratio. Fiber optic A/V equipment that uses analog techniques suffers from increased noise and distortion, producing a low quality video signal.
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