Patents by Inventor Lionel Provost
Lionel Provost has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 7835603Abstract: An in-fiber mode converter comprises fiber portions (10) constituting an input microlens, a fiber portion (20) constituting a phase shifting region adapted to convert a propagation mode of an optical signal into another propagation mode, and fiber portions (30) constituting an output microlens. The fiber portions are spliced, the converter is compact and losses are minimized relative to mode conversion in free space.Type: GrantFiled: August 4, 2005Date of Patent: November 16, 2010Assignee: Alcatel LucentInventors: Carlos De Barros, Lionel Provost, Pierre Sansonetti, Philippe Chanclou
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Patent number: 7724995Abstract: 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 (3) that is supplied with signals that are propagated in a first guided mode and that delivers the signals in a multimode fibre (4) partly in the first guided mode and partly in a second guided more of a higher order that the first. The multimode fibre (4) 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 (4).Type: GrantFiled: September 29, 2004Date of Patent: May 25, 2010Assignee: Draka Comteq B.V.Inventors: Carlos De Barros, Lionel Provost, Xavier Bonnet, Isabelle Riant
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Patent number: 7627220Abstract: The invention relates to optical fibers incorporating cavities in their structure.Type: GrantFiled: April 1, 2005Date of Patent: December 1, 2009Assignee: AlcatelInventors: Lionel Provost, Gilles Melin, Laurent Gasca
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Publication number: 20090041410Abstract: 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 (3) that is supplied with signals that are propagated in a first guided mode and that delivers the signals in a multimode fibre (4) partly in the first guided mode and partly in a second guided more of a higher order that the first. The multimode fibre (4) 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 (4).Type: ApplicationFiled: September 29, 2004Publication date: February 12, 2009Applicant: DRAKA COMTEQ B.V.Inventors: Carlos De Barros, Lionel Provost, Xavier Bonnet, Isabelle Riant
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Publication number: 20080267559Abstract: An in-fiber mode converter comprises fiber portions (10) constituting an input microlens, a fiber portion (20) constituting a phase shifting region adapted to convert a propagation mode of an optical signal into another propagation mode, and fiber portions (30) constituting an output microlens. The fiber portions are spliced, the converter is compact and losses are minimized relative to mode conversion in free space.Type: ApplicationFiled: August 4, 2005Publication date: October 30, 2008Applicant: Alcatel LucentInventors: Carlos De Barros, Lionel Provost, Pierre Sansonetti, Philippe Chanclou
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Patent number: 7424195Abstract: Optical fiber having a multimode core (10) comprising:—a first zone (11), which is homogeneous, made of a first material, which has a first refractive index;—a second zone (12) made of at least one second material, which has a second refractive index, which is less than the first index, that second zone (12) being peripherally arranged with respect to the first zone (11), said first and second zones being configured so that the interface between those zones defines, in a transverse plane, a contour which has a star shape such that the multimode transmission characteristics of the fiber are equivalent to those of a graded-index fiber. Application in dual-core amplifying fibers or lasers or in transmission fibers for local networks.Type: GrantFiled: June 16, 2004Date of Patent: September 9, 2008Assignee: AlcatelInventors: Xavier Andrieu, Lionel Provost, Laurent Gasca
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Patent number: 7397599Abstract: The amplifying optical fiber comprises a single-mode core and a multimode core surrounding the single-mode core, the multimode core containing a doped layer referred to as a “doped ring” and having a certain concentration of active rare earth ions to perform amplification by active rare earth ions on at least one optical signal for injection into the amplifying fiber. The fiber is dimensioned so that the product of its length multiplied by its Raman efficiency is greater than or equal to 0.5 W?1. In addition, the fiber presents absorption defined by an absorption coefficient expressed in dB/m, which absorption presents, at a certain wavelength, a maximum value referred to as the “absorption maximum”, the fiber presents accumulated absorption, corresponding to the product of its length multiplied by the absorption maximum, that is greater than or equal to 100 dB. The invention also provides an amplifier including such a fiber, a single-mode pump, and a multimode pump.Type: GrantFiled: October 29, 2007Date of Patent: July 8, 2008Assignee: AlcatelInventors: Ekaterina Bourova, Christian Simonneau, Catherine Martinelli, Lionel Provost
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Patent number: 7389022Abstract: An optical waveguide suitable for a slanted Bragg grating (SBG) to be written thereinto has a refractive index profile defining a core and a cladding and a specific photosensitivity profile. This photosensitivity profile W(r) is such that, for a given SBG writing angle ?, the coupling of the fundamental mode into itself as counterpropagation in the waveguide, K(?), is substantially zero and such that its derivative K?(?) with respect to the angle ? is also substantially equal to zero. The zero derivative, and also the zero coupling of the fundamental mode as a function of the angle, means that a widened reflection pocket about the grating write angle is guaranteed.Type: GrantFiled: December 1, 2004Date of Patent: June 17, 2008Assignee: ALCATELInventors: Carlos De Barros, Lionel Provost, Hélène Biscaras, Christine Moreau
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Publication number: 20080118213Abstract: Optical fiber having a multimode core (10) comprising:—a first zone (11), which is homogeneous, made of a first material, which has a first refractive index;—a second zone (12) made of at least one second material, which has a second refractive index, which is less than the first index, that second zone (12) being peripherally arranged with respect to the first zone (11), said first and second zones being configured so that the interface between those zones defines, in a transverse plane, a contour which has a star shape such that the multimode transmission characteristics of the fiber are equivalent to those of a graded-index fiber. Application in dual-core amplifying fibers or lasers or in transmission fibers for local networks.Type: ApplicationFiled: June 16, 2004Publication date: May 22, 2008Applicant: Draka Comteq B.V.Inventors: Xavier Andrieu, Lionel Provost, Laurent Gasca
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Patent number: 7376306Abstract: 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.Type: GrantFiled: August 26, 2004Date of Patent: May 20, 2008Assignee: Avanex CorporationInventors: Lionel A. Provost, Marianne Molina, Xavier Bonnet, Carlos Luis De Barros
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Publication number: 20080056659Abstract: The amplifying optical fiber comprises a single-mode core and a multimode core surrounding the single-mode core, the multimode core containing a doped layer referred to as a “doped ring” and having a certain concentration of active rare earth ions to perform amplification by active rare earth ions on at least one optical signal for injection into the amplifying fiber. The fiber is dimensioned so that the product of its length multiplied by its Raman efficiency is greater than or equal to 0.5 W?1. In addition, the fiber presents absorption defined by an absorption coefficient expressed in dB/m, which absorption presents, at a certain wavelength, a maximum value referred to as the “absorption maximum”, the fiber presents accumulated absorption, corresponding to the product of its length multiplied by the absorption maximum, that is greater than or equal to 100 dB. The invention also provides an amplifier including such a fiber, a single-mode pump, and a multimode pump.Type: ApplicationFiled: October 29, 2007Publication date: March 6, 2008Applicant: AlcatelInventors: Ekaterina Bourova, Christian Simonneau, Catherine Martinelli, Lionel Provost
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Patent number: 7308178Abstract: The amplifying optical fiber (1) comprises a single-mode core (10) and a multimode core (20) surrounding the single-mode core, the multimode core containing a doped layer referred to as a “doped ring” (21) and having a certain concentration of active rare earth ions (6) to perform amplification by active rare earth ions on at least one optical signal for injection into the amplifying fiber. The fiber is dimensioned so that the product of its length multiplied by its Raman efficiency is greater than or equal to 0.5 W?1. In addition, the fiber presents absorption defined by an absorption coefficient expressed in dB/m, which absorption presents, at a certain wavelength, a maximum value referred to as the “absorption maximum”, the fiber presents accumulated absorption, corresponding to the product of its length multiplied by the absorption maximum, that is greater than or equal to 100 dB. The invention also provides an amplifier including such a fiber, a single-mode pump, and a multimode pump.Type: GrantFiled: March 3, 2004Date of Patent: December 11, 2007Assignee: AlcatelInventors: Ekaterina Bourova, Christian Simonneau, Catherine Martinelli, Lionel Provost
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Patent number: 7272286Abstract: The invention relates to the field of dispersion managed optical fibres for use in wavelength division multiplex transmission networks. A multimode optical fibre in which at least one higher-order mode can be propagated, is constituted radially by a single central core surrounded by an optical cladding (13), and comprises, for said higher mode or for at least one of said higher-order modes, positive chromatic dispersion optical fibre portions (D+) alternating longitudinally with negative chromatic dispersion optical fibre portions (D?).Type: GrantFiled: December 22, 2004Date of Patent: September 18, 2007Assignee: Draka Comteq B.V.Inventors: Lionel Provost, Isabelle Bongrand, Carlos De Barros
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Publication number: 20070201801Abstract: The invention relates to optical fibers incorporating cavities in their structure.Type: ApplicationFiled: April 1, 2005Publication date: August 30, 2007Inventors: Lionel Provost, Gilles Melin, Laurent Gasca
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Patent number: 7197219Abstract: An optical module for chromatic dispersion compensation comprises an optical fiber wound so as to present a variable radius of curvature. The fiber has an index profile such that it has, for the main propagation mode, a negative dispersion value having a minimum at a given wavelength in a given spectral band. The value and the spectral position of the dispersion minimum vary with the radius of curvature of the fiber. The module allows the introduction of a large chromatic dispersion compensation value overall of a given spectral band, as well as compensation corrections for specific wavelengths inside the given spectral band.Type: GrantFiled: November 17, 2004Date of Patent: March 27, 2007Assignee: Draka Comteq B.V.Inventors: Lionel Provost, Pierre Sansonetti, Christine Moreau, Laurent Gasca, Jean-Marc Blondy, Jean-Louis Auguste, Sebastien Fevrier, Frederic Gerome
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Patent number: 7034995Abstract: An optical fiber amplifier is considered comprising a mono-mode core, a first cladding around said core and at least a further cladding around said first cladding while said first cladding includes a ring shaped active region doped with rare earth material surrounding said mono-mode core. Advantageously, the first cladding is designed with a radial refractive index following an almost continuous decreasing function for increasing radius. The use of a continuously decreasing refractive index for the cladding at the outer border of the ring shaped active medium optimize the efficiency of the coupling between the core and the cladding.Type: GrantFiled: September 29, 2003Date of Patent: April 25, 2006Assignee: ALCATELInventors: Lionel Provost, Christian Simonneau, Isabelle Bongrand, Philippe Bousselet, Christine Moreau, Dominique Bayart, Laurent Gasca
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Publication number: 20060045422Abstract: 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.Type: ApplicationFiled: August 26, 2004Publication date: March 2, 2006Inventors: Lionel Provost, Marianne Molina, Xavier Bonnet, Carlos De Barros
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Patent number: 7006751Abstract: The invention relates to the field of amplifying or emitting optical fibers. It comprises an amplifying optical fiber doped with a rare earth comprising a plurality of successive segments (1, 2, 3, 4, 5), presenting a monomode core and a multimode core, presenting at the periphery of the multimode core a peripheral segment (4) of low index so as to increase the numerical aperture of the optical fiber, outer cladding (5) being situated at the periphery of the low index peripheral segment (4), the multimode core being at least in part above the outer cladding (5), the peripheral segment (2) presenting a decreasing gradient shape.Type: GrantFiled: May 26, 2004Date of Patent: February 28, 2006Assignee: Draka ComteoInventors: Lionel Provost, Gilles Melin, Andre Le Sauze, Anne Fleureau, Christian Simonneau, Xavier Rejeaunier
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Publication number: 20060010319Abstract: A procedure for communication between at least two applications A and B in an operating system intended to prevent application A from accessing information content of an application window B, including creating at least one variable by application B; receiving a request from application A by application B; verifying a value of the variable by application B to verify validity of the request or of authenticating its origin; and responding to the request as a function of the value and/or the origin.Type: ApplicationFiled: August 5, 2003Publication date: January 12, 2006Inventors: Vincent Bonnet, Serge Piasek, Lionel Provost
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Publication number: 20050254762Abstract: An optical module for chromatic dispersion compensation comprises an optical fiber wound so as to present a variable radius of curvature. The fiber has an index profile such that it has, for the main propagation mode, a negative dispersion value having a minimum at a given wavelength in a given spectral band. The value and the spectral position of the dispersion minimum vary with the radius of curvature of the fiber. The module allows the introduction of a large chromatic dispersion compensation value overall of a given spectral band, as well as compensation corrections for specific wavelengths inside the given spectral band.Type: ApplicationFiled: November 17, 2004Publication date: November 17, 2005Inventors: Lionel Provost, Pierre Sansonetti, Christine Moreau, Laurent Gasca, Jean-Marc Blondy, Jean-Louis Auguste, Sebastien Fevrier, Frederic Gerome