36 research outputs found
Nonlinear femtosecond pulse propagation in an all-solid photonic bandgap fiber
Nonlinear femtosecond pulse propagation in an all-solid photonic bandgap fiber is experimentally and numerically investigated. Guiding light in such fiber occurs via two mechanisms: photonic bandgap in the central silica core or total internal reflection in the germanium doped inclusions. By properly combining spectral filtering, dispersion tailoring and pump coupling into the fiber modes, we experimentally demonstrate efficient supercontinuum generation with controllable spectral bandwidth
Control of Modulation and Soliton Polarization Instabilities in Photonic Crystal Fibers with Birefringence Management
International audienc
Control of modulation and soliton polarization instabilities in photonic crystal fibers with birefringence management
Photonic crystal fibers with composite linear birefringence, that is induced by both microstructure geometry and stress applying parts, permit the management of the wavelength dependence of both group and phase birefringence. In this work we investigate the novel nonlinear propagation phenomena that are enabled by birefringence management. Vector modulation instability is enhanced near the zero phase birefringence wavelength. Soliton polarization instability is controlled by Raman self-frequency shifting across the zero phase birefringence wavelength
Single-Polarization Single-Mode Photonic Band Gap Fiber
We studied the polarization properties of four photonic band gap fibers with elliptical core and different cladding geometries. To do so we relied on a fully vectorial calculation method, which uses a hybrid edge/nodal finite element approach with perfectly matched layer absorbing boundary conditions. We determined the spectral dependence of the confinement loss for the fundamental modes of orthogonal polarizations. Our results show that, for the four structures studied, the polarization dependent loss is so high that they can be used as fiber-optic polarizers in the full band gap range
Parametric instabilities and vector solitons in composite PCF with zero phase birefringence and nonzero group birefringence
International audienc
Managing Group and Phase Birefringence for Nonlinear Optics in Photonic Crystal Fibers
paper We3.P.20
Single-Polarization Single-Mode Photonic Band Gap Fiber
We studied the polarization properties of four photonic band gap fibers with elliptical core and different cladding geometries. To do so we relied on a fully vectorial calculation method, which uses a hybrid edge/nodal finite element approach with perfectly matched layer absorbing boundary conditions. We determined the spectral dependence of the confinement loss for the fundamental modes of orthogonal polarizations. Our results show that, for the four structures studied, the polarization dependent loss is so high that they can be used as fiber-optic polarizers in the full band gap range