Kurzbeschreibung
(Englisch)
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The goal is to learn more on the physics and propagation properties of the very recent photonic bandgap fibers. They represent a practical implementation of a photonic crystal structure, could have a high impact for telecoms due to the potential for extremely low loss and negligible nonlinearities of guidance in air, and bear interesting physical phenomena due to their unique light guidance mechanism.
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Partner und Internationale Organisationen
(Englisch)
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AT, BE, BG, CH, CY, CZ, DE, DK, ES, FI, FR, GR, HU, IE, IL, IT, LT, NL, PL, RO, SE, SK, UK
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Abstract
(Englisch)
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During the last year of this COST P11 action, no new PBG nor PCF fibers were available. Most of the activities moved towards modeling, an activity we do not work on in Geneva. Consequently, we concentrated our efforts on nonlinear effects in DWDM systems with an emphasis on weak signals and very low noise. Indeed, this is the situation that arises when one tries to multiplexe a classical and a quantum channel, as in quantum key distribution systems. Raman and Brillouin scattering are the main limiting factors in WDM classical/quantum systems. Their study at the single-photon level requires new metrology techniques, very efficient filtering and single-photon detectors. Part of the work was done in collaboration with the PUC univesrity of Rio de Janeiro, thanks to a brazilian student who visited Geneva for several months. The work is still ongoing beyond the life time of this COST action. A first scientific paper written in collaboration with the University de Rio de Janeiro should be finished in the fall 2008.
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