Detection
Transmission systems on optical fibers
Article REF: TE7115 V2
Detection
Transmission systems on optical fibers

Authors : Michel JOINDOT, Irène JOINDOT

Publication date: January 10, 2013, Review date: March 21, 2016 | Lire en français

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3. Detection

3.1 Basic principle of direct detection

The optical power fluctuations carrying the information are converted into electrical current fluctuations in the photodetector, which may be a PIN diode or an avalanche diode.

Incident photons illuminating the photodetector junction create photoelectrons by a Poisson process. In the case of the PIN photodiode, the average value of photocurrent I is given by :

I=eηhνsP=SP( 8 )
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