Avanex Corporation

Alcatel

Draka Comteq B.v.

Xavier Bonnet

Isabelle Riant

Carlos Luis De Barros

Lionel Provost

Marianne Molina

Jean-Jacques Guerin

Alain Fradet

Hedi Labidi

Hervé Lefebvre

Hervé Loury

Valérie Girardon

An optical device (D) is dedicated to the transformation of the propagation mode of optical signals. This device comprises at least a first mode converter () that is supplied with signals that are propagated in a first guided mode and that delivers the signals in a multimode fibre () partly in the first guided mode and partly in a second guided more of a higher order that the first. The multimode fibre () comprises at least first passive filtering means (R) which have the task of converting the first guided mode into at least one dissipative cladding mode in order to prevent or limit the propagation of the signals in this first guided mode while at the same time authorising the propagation of the signals having the second guided mode in the multimode fibre ().

Suppresson of undesirable signal propagation mode(s) downstream of mode converter

The present invention consists in an optical device comprising an optical component and an optical medium with different refractive indices, said optical component being at least partly immersed in said optical medium, which device is characterized in that said optical medium contains a salt that is in the liquid state in the range of temperatures at which said optical component is used and stored, i.e. in a range of temperatures generally from &#x2212;40&#xb0; C. to +200&#xb0; C. The optical component may in particular be a Bragg long-period grating (LPG) or a photonic crystal fiber.

Optical device comprising an optical component and an optical medium with different refractive indices

An optical filter comprises a waveguide and a plurality of Slanted Bragg Gratings written in the waveguide, wherein at least two of the Slanted Bragg Gratings overlap one another. A method of producing an optical filter comprises the steps of passing an ultraviolet light through a first portion of a chirped phase mask onto a first portion of a photosensitive waveguide so as to form a first Slanted Bragg Grating in the first portion of the waveguide and passing the ultraviolet light through a second portion of the chirped phase mask onto a second portion of the photosensitive waveguide so as to form a second Slanted Bragg Grating in the second portion of the waveguide, wherein the first and second Slanted Bragg Gratings overlap one another. A further annealing step may cause a spectrum of the filter to match a target spectrum.

Slanted Bragg grating gain flattening filter having spatially overlapping elementary filters and a manufacturing method therefor

A tuneable optical fibre comprising a long-period Bragg grating () written in a portion of an optical waveguide () comprising a core and an optical cladding (), characterised in that the portion of the waveguide comprising the grating () is at least partially immersed in an external environment consisting of two distinct sections, a first section () whose refractive index is higher than that of the optical cladding () and a second section () whose refractive index is lower than that of the optical cladding (), the long-period grating being at least partially immersed in one of the said sections so as to almost independently tune the wavelength and/or the contrast of the spectral response of the filter.

Dynamic gain equalizing filter

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St. Remy les Chevreuse, France

Xavier Bonnet