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 = \frac{e η}{h ν_{s}} P = S P

^( 8 )

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Bibliography

(1) - JOINDOT (I.), JOINDOT (M.), douze coauteurs - Les télécommunications par fibres optiques - . Collection Technique et Scientifique des Télécommunications, Dunod (1996).
(2) - DESURVIRE (E.) - Erbium doped fiber amplifiers. -...