Draka Comteq B.v.

Alcatel Lucent

Alcatel

Ekaterina Burov

Louis-Anne De Montmorillon

Simon Richard

Frans Gooijer

Alain Pastouret

Cedric Gonnet

Christine Collet

David Boivin

Olivier Cavani

Christian Simonneau

Laurent Gasca

Gilles Melin

Catherine Martinelli

Elise Regnier

Christine Moreau

Florence Leplingard

Laurent Bigot

Sébastien Fevrier

Laurence Lorcy

Stephanus Gerardus Fransiscus Geerings

Cédric Gonnet

Aurelien Bergonzo

Christian Simmonneau

Aurélien Bergonzo

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

Device for the emission or amplification of a signal, comprising an optical fiber () having a solid core () of refractive index n, made of a silica glass doped with a rare earth, such as erbium, ytterbium or neodymium, said core being surrounded by an optical cladding () comprising at least a pair of silica layers composed of a first, inner layer (), having a refractive index greater than the refractive index nof the core (), covered by a second, outer layer (). The optical fiber () comprises several pairs of silica layers () around the core (), each pair comprising an inner layer () of refractive index nand an outer layer () of refractive index n, the refractive index nof the outer layer being lower that the refractive index nof the inner layer of the same pair.

Rare earth-doped fiber optic device for emitting or amplifying a signal in the 'S' band

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

An amplifier or laser using the stimulated Raman diffusion effect comprises a light guide (), and a light pump () for producing a pump wave. In order to increase amplification efficiency, the light guide comprises a core structure that includes at least one optically active component that presents an electron transition energy corresponding to a wavelength that is close to the wavelength of the pump wave while nevertheless not being identical thereto. The invention is applicable to optical transmission systems.

Growing community of inventors

Boulogne-Billancourt, France

Ekaterina Burov