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Fiber Optics, Second Edition by Edward A. Lacy, Robert J. Hoss

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6 Detectors and Receivers

At the receiver end of a fiber optic system, lightwaves are first converted to an electrical current and then amplified and converted to a voltage signal by the first amplifier stage known as a preamplifier. The resultant signal is then conditioned for further application in a different fashion depending on whether it is analog or digital. If analog, the preamplifier is generally followed by more linear amplifier stages and perhaps some automatic gain control. If digital, the signal is amplified and then fed to a threshold detector and timing electronics that decode it into binary signals.

6.1 Photodetectors for Fiber Optics

Semiconductor light sensors (photodetectors) are used to convert the optical energy to electrical ...

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