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. Les-caractéristiques-spectrales, (2?) = 19, 6Thz et la largeur de la raie est ??/(2?) = 15GHz. De plus, d` es lors que lapremì ere bande Stokes devient suffisammenténergétiquesuffisammenténergétique, elle peut elle aussi donner naissancè a une bande Stokes en subissant l'effet Raman, donnant naissancè a une cascade

. Le-montage-est-décrit-en-fig, Il consistè a injecter un maximum de puissance dans le guide etàetà analyser spectralement le rayonnement résultant en l'injectant dans une fibrè a l'aide d'un objectif de microscope (OM), la fibré etant connectéè a un analyseur de spectre optique (OSA) Le spectre mesuré estégalementestégalement illustré sur cette figure. Il est important de noter que les intensités relatives des différentes raies n'ont pas de réelle signification sur ce graphe. On distingue la pompè a 532nm et la cascade 138 C

. Dans-notre-cas, Stokes et résulte en l'apparition de la raie anti-Stokes Comme ces composantes ont des fréquences différentes, aucun accord de phase ne sera, ` a priori, réaliséréaliséà cause de la dispersion chromatique . Nous verrons que la modulation de phase non linéaire permettra la réalisation de cet accord de phase. D` es lors que l'effet Raman crée une cascade, les ordres supérieurs Stokes donnent naissance eux aussì a un mélangè a quatre ondes, ce qui explique l'apparition d'ordres anti-Stokes supérieurs, visibles sur la Fig

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