93 research outputs found
Outils pour bùtir : la science et la technologie au service du développement
Une partie de la collection de documents gouvernementaux et autres relatant Ă lâhistoire du CRDI.Version anglaise disponible dans la BibliothĂšque numĂ©rique du CRDI: Give us the tools : science and technology for developmentVersion espagnole disponible dans la BibliothĂšque numĂ©rique du CRDI : Herramientas de progreso : ciencia y tecnologĂa para el desarroll
Phase sensitivity to axial strain of microstrustured optical silica fibers
International audienceWe compare, thanks to a Sagnac interferometer, the phase sensitivity to strain of different microstructured optical silica fibers (MSF) that we design and fabricate. Our results show that when a same elongation is applied to different MSF, the induced phase change is equal or lower than the one obtained for a standard fiber, showing no advantage on this parameter for sensing applications
Towards More Coherent Sources Using a Microstructured Chalcogenide Brillouin Fiber Laser
International audienceUp to 16 dB frequency noise reduction and a linewidth 8 times narrower that of the pump source is reported for the Stokes component in a compact Brillouin ïŹber laser made of chalcogenide microstructured ïŹber. Since the pump wave is not resonant in the ring cavity, an active stabilization of the laser is not primordial thus making the system simpler and cheaper. Although only a 3 metre-long microstructured chalcogenide ïŹber was used as gain medium, a very low laser threshold power of 6 mW was obtained for nonresonant pumping. The linewidth-narrowing effect achieved in our BFL cavity is also discussed
6 mW and 30 mW laser threshold for respectively 1st and 2nd Brillouin Stokes order in a Ge10As24Se68 chalcogenide fiber
International audienceA compact second-order Stokes Brillouin ïŹber laser made of microstructured chalcogenide glass is reported for the ïŹrst time. This laser has very low optical pump-power threshold for Stokes conversion: 6 mW for ïŹrst order and only 30 mW for second order with nonresonant pumping
Lasers Brillouin à fibre microstructurée en verre de chalcogénure à trÚs faibles seuils
National audienceL'utilisation de ïŹbres microstructurĂ©es en verre de chalcogĂ©nure ouvre la voie Ă la rĂ©alisation des lasers Ă ïŹbre Brillouin prĂ©sentant des seuils trĂšs bas comparativement aux lasers en ïŹbre silice, de l'ordre du milliWatt en pompage non-rĂ©sonant. Ces lasers sont compacts et par nature mono-frĂ©quence. Leurs caractĂ©ristiques de bruit sont amĂ©liorĂ©es par rapport Ă la pompe comme cela a Ă©tĂ© dĂ©jĂ prĂ©dit pour les lasers Brillouin
Relative intensity noise and frequency noise of a compact Brillouin laser made of As38Se62 suspended-core chalcogenide fiber
International audienceRelative intensity noise and frequency noise have been measured for the first time for a single-frequency Brillouin chalcogenide As38Se62 fiber laser. This is also the first demonstration of a compact suspended-core fiber Brillouin laser, which exhibits a low threshold power of 22 mW and a slope efficiency of 26% for nonresonant pumping
Brillouin fiber laser using As38Se62 suspended-core chalcogenide fiber
International audienceIn this paper, an all-fiber Brillouin laser ring cavity using a 3-m-long suspended-core chalcogenide As38Se62 fiber is reported for the first time to our knowledge. For a nonresonant ring cavity with no servo-locking, a laser threshold power of 37 mW and an efficiency of 26 % were obtained for a fiber having a core diameter of 5 ÎŒm. The linewidth of the Brillouin fiber laser and the pump laser were respectively measured to be below 4 kHz, the resolution of our autocorrelator, and 250 kHz, thus showing the linewidth-narrowing nature of the Brillouin laser. This result paves the way to compact Brillouin lasers with low threshold power and good spectral purity. A full experimental Brillouin characterization is also reported. We measured a Brillouin gain spectrum of 14.2 MHz, a Brillouin gain coefficient of 5.6x10-9 m/W and a Brillouin frequency shift of 7.95 GHz in our fiber
Linewidth-narrowing and intensity noise reduction of the 2nd order Stokes component of a low threshold Brillouin laser made of Ge10As24Se68 chalcogenide ïŹber
International audienceA compact second-order Stokes Brillouin ïŹber laser made of microstructured chalcogenide ïŹber is reported for the ïŹrst time. This laser required very low pump power for Stokes conversion: 6 mW for ïŹrst order lasing and only 30 mW for second order lasing with nonresonant pumping. We also show linewidth-narrowing as well as intensity noise reduction for both the 1st and 2nd order Stokes component when compared to that of the pump source
All-optical time-domain demultiplexing of 170.8 Gbit/s signal in chalcogenide GeAsSe microstructured fibre
International audienceWe report on four-wave-mixing-based all-optical time-domain demultiplexing of a 170.8 Gb/s signal down to 42.7 Gb/s in a chalcogenide GeAsSe microstructured fiber. The high nonlinearity of the fiber allows error-free and low power penalty operation with only 56 mW of total input average power
Wavelength conversion in a highly nonlinear chalcogenide microstructured fiber
International audienceWe report on all-optical wavelength conversion of a 56 Gb/s differential quadrature phase shift keying signal and a 42.7 Gb/s on-off keying signal. Wavelength conversion is based on four-wave mixing effect in a 1 m long highly nonlinear GeAsSe chalcogenide fiber. The high nonlinearity of the fiber allows low-power penalty operation with a total average power of less than 60 mW
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