Alcatel

Alcatel Lucent

Draka Comteo

Christian Simonneau

Gabriel Charlet

Lionel Provost

Laurent Gasca

Dominique Bayart

Francesco Vacondio

Catherine Martinelli

Dominique Chiaroni

Thierry Zami

Stéphanie Blanchandin

Ekaterina Bourova

Yvan Pointurier

Alain Pastouret

Ekaterina Burov

Gilles Melin

Dominique Annie Mongardien

Christine Moreau

Sébastien Bigo

Philippe Bousselet

Jean-Christophe Antona

Sébastien Fevrier

Loïc Becouarn

Anne Fleureau

Xavier Rejeaunier

Sophie Etienne

Isabelle Bongrand

Gema Buforn Santamaria

Anne Durecu

Andre Le Sauze

A data transmission system () comprises: a main optical packet ring () comprising a plurality of separate packet transmission channels; and a plurality of secondary optical packet rings () interconnected through the main optical packet ring. Each of the secondary optical packet rings () comprises a plurality of nodes (). Each of said packet transmission channels of the main optical packet ring () is connected to a different node of each secondary optical packet ring (), respectively.

Optical data transmission system

A method and device for compensating, within a node of an optical network, chromatic dispersion undergone by optical packets transmitted within time slots of wavelength division multiplexed channels along at least one link of the optical network, a time slot duration corresponding to the sum of a packet duration and an inter-packet gap duration. The method and device demultiplexes the wavelength division multiplexed channels into a plurality of bands, and transmits the bands, via a respective plurality of delay lines having predetermined delays, toward a respective plurality of packet add/drop structures comprising a coherent receiver.

Method for compensating chromatic dispersion and associated equipment

Proposed is an optical node that contains a number of A optical demultiplexers. Each demultiplexer is adapted to provide at its N output ports N incoming optical signals received from N optical cores of an incoming optical multi-core fiber. Furthermore, the optical node contains a number of B optical multiplexers. Each multiplexer is adapted to receive at its N input ports N outgoing optical signals and to insert the N outgoing optical signals into N optical cores of an outgoing multi-core fiber. The optical node is configurable to switch one of the incoming optical signals simultaneously onto B input ports of different multiplexers and to combine A of the incoming optical signals from A output ports of different demultiplexers onto a same input port of one of the multiplexers. Alternatively, N incoming signals are received from N different mode signals of a spatially multiplexed multi-mode fiber and then transmitted as N multi-mode signals into a spatially multiplexed multi-mode fiber.

Optical node for switching signals between optical fibers

A optical transmitter and method for transmitting digital data on an optical channel, performing the steps of generating first and second baseband digital signals, modulating a first polarized optical carrier wave component in accordance with the first baseband digital signal, modulating a second polarized optical carrier wave component in accordance with the second baseband digital signal, wherein the second polarized optical carrier wave component has an orthogonal polarization to the first polarized optical carrier wave component and combining the first and second modulated optical carrier wave components into a propagation medium. The first and second baseband digital signals are generated in a correlated manner so that the modulated optical carrier wave components are combined as a modulated single-polarization optical carrier wave.

Optical transmission with polarization division multiplexing

A bidirectional optical amplifier () is arranged to be passed through in one direction by a downstream optical signal (SDS) and in an opposite direction by an upstream optical signal (SUS), and comprises: a first optical circulator () having three ports, a first port of the first optical circulator defining a first connector () at one end of the bidirectional optical amplifier, a second optical circulator () having three ports, a first port of the second optical circulator defining a second connector () at an opposite end of the bidirectional optical amplifier, a downstream unidirectional optical amplifier () connected between a second port of the first optical circulator and a second port of the second optical circulator so as to define a downstream amplification path () for the downstream optical signal, and an upstream unidirectional optical amplifier () connected between a third port of the first optical circulator and a third port of the second optical circulator so as to define an upstream amplification path () for the upstream optical signal. The bidirectional optical amplifier () further comprises a waveband separator () connected between the second port of the first optical circulator () and an input of the downstream unidirectional optical amplifier ().

Bidirectional optical amplifier

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 invention consists in an amplifying optical fiber comprising a core containing a dopant and a cladding, wherein said core comprises a monomode core intended to propagate an optical signal, quantum dots of a semiconductor material being disposed in or near said monomode core, and a multimode core surrounding the monomode core, intended to receive a pumping signal.

Amplifying optical fiber

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 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. 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.

Doped-ring amplifying optical fiber, and an amplifier containing such a fiber

An optical amplification unit comprises at least one optical amplifier for amplifying an optical signal and a filter preceding or following the optical amplifier. The optical amplifier comprises a first measuring device for measuring a property of an input signal of the optical amplifier, a second measuring device for measuring a property of an output signal of the optical amplifier, and a control circuit for controlling a gain characteristic of the optical amplifier in dependence of said input and output signal properties. The filter exhibits a wavelength-dependent attenuation of the optical signal. The optical amplification unit is connectable to an optical fiber span and the filter is adapted to compensate for a span loss tilt caused by said optical fiber span. An optical transmission system with at least one such optical amplification unit and corresponding methods.

Optical amplification unit with span loss tilt compensation, fiber optical transmission system comprising the same, and corresponding methods

An optical amplifier assembly for submarine applications. The optical amplifier assembly comprises: a first and a second double stage fiber amplifier with respective first and second fiber amplifiers for amplifying optical signals (OS, OS') each propagated on a respective optical fibre, said optical fibres being operated in opposite operating directions (W-E, E-W), and a common pump source comprising a plurality of pump light sources, the common pump source being coupled via a coupler as a co-propagating pump to the first and second fiber amplifiers of the first and second double stage fiber amplifiers. The proposed optical amplifier assembly further comprises a gain flattening filter between the two fiber amplifiers of the first and second double stage fiber amplifiers. Thus the proposed optical amplifier assembly presents an increased efficiency with respect to an output power at a constant pump power and allows to adjust the pump power for maintaining a given output power without excessive NF degradation.

Optical transmission system and optical filter assembly for submarine applications

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. 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.

WDM optical signals are amplified using optical parametric amplification by applying an appropriate separation of those optical signals according to their carrier angular frequencies. These angular frequencies are within the two principal amplification bands defined by the non-linear optical medium used for optical parametric amplification. It is advantageously proposed to launch into the non-linear optical medium in one direction the optical signals of carrier frequencies within the one amplification band, and in the opposite counter-propagating direction the optical signals of carrier angular frequencies within the other amplification band. The required pump radiation is launched co-linearly with the respective optical signals to be amplified.

Large bandwidth optical parametric amplifier

The invention discloses an optical amplifier () that amplifies signal light in a signal band in a fiber optic transmission system () having at least first and second optically pumped signal light gain amplifying stages (),

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Antony, France

Christian Simonneau