Mercredi 23 février 2011 à 13h30
Objet : Séminaire EPh/Optique-Photonique
**What :* ** Coherence multiplexing technique for real-time all optical arithmetic operations.*
**Who : * * Badr-Eddine BENKELFAT
**When :* * Mercredi 23 février 2011 à 13h30
**Where :* * Salle B206
**Abstract :* *
Coherence modulation of broadband light source has found many applications in the last decade including optical communications and optical sensing. This is a modulation method which utilizes the coherence properties of broadband sources for encoding signals onto light beams. One major asset of the method, compared to other conventional optical modulation methods, is that it allows an original multiplex coding of several signals through a single light beam.
Before presenting the use of coherence multiplexing (also called path-difference, by analogy with WDM optical communications) to achieve simultaneous coding and decoding of analogue signals, we give an overview of established physical principles behind coherence modulation of light in terms of correlation of stochastic light field emitted by a broadband source. We show, for the first time, how the coherence multiplexing process can be exploited to achieve parallel real-time all optical signal addition and subtraction.