Draka Comteq B.v.

Alcatel Lucent

Alcatel

Nexans

Draka Comteq France

Alain Pastouret

Ekaterina Burov

Christine Collet

Louis-Anne De Montmorillon

Laurent Gasca

Cedric Gonnet

Stéphanie Blanchandin

Pierre Sillard

Xavier Andrieu

David Boivin

Sophie De Monredon

Jean-Pierre Jolivet

Corinne Chaneac

Olivier Cavani

Bernard Boutevin

Christian Belouet

Simon Richard

Frans Gooijer

Dominique Morichere

Christian Simonneau

Gilles Melin

Elise Regnier

Christine Moreau

Alain Rousseau

Pascal Baniel

Jean-Yves Barraud

Joël Jacquet

Cédric Gonnet

Stephanus Gerardus Fransiscus Geerings

Aurelien Bergonzo

Sylvic Barusseau

Bernard Perrin

Aurélien Bergonzo

The invention relates to an optical fibercomprising a coreand a claddingsurrounding the coreand having an outer diameter of 125 &#x3bc;m, the optical fibercomprising a cured primary coatingdirectly surrounding the claddingand a cured secondary coatingdirectly surrounding the cured primary coating, said cured primary coatinghaving a thickness tbetween 10 and 18 &#x3bc;m and an in-situ tensile modulus Emodbetween 0.10 and 0.18 MPa, said cured secondary coatinghaving a thickness tbetween 10 microns and 18 microns and an in-situ tensile modulus Emodbetween 700 and 1200 MPa, wherein said first and second thicknesses and said first and second in-situ tensile moduli satisfy the following equation:4%&#x3c;(modmod)/(modmod)&#x3c;50%.

Reduced diameter optical fiber and manufacturing method

The invention relates to an optical fibercomprising a coreand a claddingsurrounding the coreand having an outer diameter of 125 &#x3bc;m, the optical fibercomprising a cured primary coatingdirectly surrounding the claddingand a cured secondary coatingdirectly surrounding the cured primary coating, said cured primary coatinghaving a thickness tbetween 10 and 18 &#x3bc;m and an in-situ tensile modulus Emodbetween 0.10 and 0.18 MPa, said cured secondary coatinghaving a thickness tlower or equal to 18 &#x3bc;m and an in-situ tensile modulus Emodbetween 700 and 1200 MPa, wherein said first and second thicknesses and said first and second in-situ tensile moduli satisfy the following equation: 4%&#x3c;(t&#xd7;t&#xd7;Emod&#xd7;Emod)/(t&#xd7;t&#xd7;Emod&#xd7;Emod)&#x3c;50%.

Disclosed is a temperature and strain sensing optical fiber including a first doped radial zone (Z) with an associated first Brillouin shift (BS) caused by the doping of said zone (Z) and a second doped radial zone (Z) with associated second Brillouin shift (BS) caused by the doping of said second zone (Z). The concentration and/or composition of the doping materials in said first and second radial zones are chosen such that the first Brillouin Shift (BS) is different from the second Brillouin Shift (BS) for all variations of said Brillouin Shifts (BS, BS) caused by temperature and/or strain.

Temperature and strain sensing optical fiber and temperature and strain sensor

In harsh and hazardous environments, the presence of elevated levels of hydrogen gas is an indicator of chemical and/or radiological activity. The present hydrogen-sensing optical fiber provides rapid and reliable hydrogen detection and quantification, irrespective of temperature fluctuations. The hydrogen-sensing optical fiber does not exhibit significant irreversible hydrogen-induced attenuation losses after exposure to a hydrogen-rich atmosphere.

Hydrogen-sensing optical fiber hydrogen-passivated to prevent irreversible reactions with hydrogen and hydrogen-induced attenuation losses

An amplifying optical fiber includes an inner core, an inner cladding, a depressed trench, and an outer cladding (e.g., an outer optical cladding). Typically, the inner core includes a main matrix (e.g., silica-based) doped with at least one rare earth element. The depressed trench typically has a volume integral Vof between about &#x2212;2200&#xd7;10&#x3bc;mand &#x2212;1600&#xd7;10&#x3bc;m. Exemplary embodiments of the amplifying optical fiber are suitable for use in a compact configuration and high power applications.

Rare-earth-doped amplifying optical fiber

Disclosed is an amplifying optical fiber that includes a central core that is suitable for transmitting and amplifying an optical signal and a surrounding optical cladding that is suitable for confining the optical signal transmitted in the central core. The central core is formed from a main matrix that contains nanoparticles doped with at least one rare earth element. The weight concentration of the rare earth dopants in the nanoparticles is typically between about 1 and 20 percent, and the nanoparticle concentration in the central core's main matrix is between about 0.05 percent and 1 percent by volume. The disclosed optical fiber incorporates rare earth ions at high concentrations yet avoids the phenomenon of photodarkening at high transmission power.

Amplifying optical fiber and production method

The present invention embraces an amplifying optical fiber having a central core adapted to convey and amplify an optical signal and a cladding that surrounds the central core to confine the optical signal conveyed in the central core. The central core is formed of a core matrix in which nanoparticles are present. The nanoparticles themselves include a nanoparticle matrix and rare-earth-dopant elements. The core matrix may also include one or more additional dopants (i.e., in addition to nanoparticles). The amplifying optical fiber possesses a small numerical aperture and is suitable for use in high-pump-power applications without a degraded gain shape.

Rare-earth-doped optical fiber having small numerical aperture

Disclosed is a stimulated Raman scattering effect (SRS), amplifying optical fiber that includes a central core comprising a dielectric matrix that is capable of vibrating at a given frequency (&#x3c9;) under the effect of a pump signal. The optical fiber includes at least one kind of metallic nanostructure that is capable of generating surface plasmon resonance (SPR) in the optical fiber. The metallic nanostructures have a shape and composition such that the frequency of their surface plasmon resonance (&#x3c9;) corresponds to the frequency of the pump signal (&#x3c9;) and/or the frequency of the optical signal transmitted in the optical fiber (&#x3c9;).

Optical fiber amplifier having nanostructures

Disclosed is an optical fiber that includes a central core that is suitable for transmitting and amplifying an optical signal and an inner optical cladding that is suitable for confining the optical signal transmitted within the central core. The central core is formed from a core matrix that contains silica-based nanoparticles doped with at least one rare earth element. The disclosed optical fiber can be used with limited optical losses even in an environment with strong ionizing radiation.

Ionizing radiation-resistant optical fiber amplifier

An amplifier optical fiber comprising a central core of a dielectric matrix doped with at least one element ensuring the amplification of an optical signal transmitted in the fiber and a cladding surrounding the central core and suitable for confining the optical signal transmitted in the core. The fiber also comprises metallic nanostructures suitable for generating an electronic surface resonance in the dielectric matrix of central core, the wavelength of said electronic surface resonance corresponding to an excitation level of the element ensuring the amplification.

Amplifier optical fiber comprising nanoparticles and production method

Disclosed is an amplifying optical fiber having a central core and an optical cladding surrounding the central core. The central core is based on a silica matrix that includes nanoparticles, which are composed of a matrix material that includes doping ions of at least one rare earth element. The amplifying optical fiber can be employed, for example, in an optical amplifier and an optical laser.

Amplifying optical fiber and method of manufacturing

The invention relates to an optical fiber comprising a gain medium which is equipped with: a core () which is formed from a transparent material and nanoparticles () comprising a doping element and at least one element for enhancing the use of said doping element; and an outer cladding () which surrounds the core. The invention is characterized in that the doping element is erbium (Er) and in that the enhancing element is selected from among antimony (Sb), bismuth (Bi) and a combination of antimony (Sb) and bismuth (Bi). According to the invention, one such fiber is characterized in that the size of the nanoparticles is variable and is between 1 and 500 nanometers inclusive, and preferably greater than 20 nm.

Optical guide including nanoparticles and manufacturing method for a preform intended to be shaped into such an optical guide

The invention relates to an optical fiber comprising a gain medium which is equipped with: a core () which is formed from a transparent material and nanoparticles () comprising a doping element and at least one element for enhancing the use of said doping element; and an outer cladding () which surrounds the core. The invention is characterised in that the doping element is erbium (Er) and in that the enhancing element is selected from among antimony (Sb), bismuth (Bi) and a combination of antimony (Sb) and bismuth (Bi). According to the invention, one such fiber is characterised in that the size of the nanoparticles is variable and is between 1 and 500 nanometers inclusive, and preferably greater than 20 nm.

The invention concerns a method for making an optical fiber () including the following steps: producing a preform () containing nanoparticles provided with an active element including at least one recess () proximate at least part of the nanoparticles; fiber drawing of the preform () by introducing a non-oxidizing gas in the recess (), thereby limiting the risks of oxidizing the nanoparticles of the preform (). The preform () designed to the manufacture of an optical fiber () by the inventive method comprises nanoparticles provided with an active element in a doped zone () and at least one recess () proximate the doped zone ().

Method for making an optical fiber comprising nanoparticles and preform used in the manufacture of such a fiber

The present invention concerns an optical guide () comprising an amplifier medium including:

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Massy, France

Alain Pastouret