Alcatel

Alcatel Lucent

Avanex Corporation

François Dorgeuille

Ludovic Noirie

Nicolas Le Sauze

Claude Artigue

Thierry Zami

Amaury Jourdan

Arnaud Dupas

Wolfram Lautenschläger

Philippe Brosson

Stefano Beccia

Stéphane Rabaron

Frédéric Pommereail

A ring optical transmission network access node (ANi) comprises: Such nodes enable the implementation of a passive ring network comprising only one fiber and in which the coupling ratios of the couplers (CW, CP) are optimized for two opposite traffic propagation directions. Application in particular to optical fiber metropolitan access networks, with broken fiber protection device.

Ring optical transmission network access node

A WDM network (R) comprises an optical fiber (F) connected to a hub (H) via an input of a demultiplexer (DX) having N outputs to communications stations (S-S) able to deliver and/or receive spectral multiplexes of modulated optical signals with different wavelengths, via coupling means (CP, CP', MXB). The communications stations (S) are adapted to deliver spectral multiplexes of modulated optical signals from a given one of P disjoint bands of wavelengths. At least one of the coupling means (MXB) is a 2&#xd7;1 band multiplexer comprising i) an output connected to a downstream portion of the optical fiber (F), ii) a first input connected to one of the stations (then referred to as the 'primary' station) and adapted to its band of wavelengths, and iii) a second input connected to an upstream portion of the optical fiber (F) and adapted to channels having wavelengths different from those of the channels passing through the first input. The demultiplexer (DX) is of periodic type so as to deliver at each of its N outputs channels whose wavelengths belong to distinct sets of P wavelengths each belonging to a distinct one of the P disjoint bands.

D(WDM) communications network employing periodic spectral multiplex processing

A Laser device for optical packet data transmission in TDM-systems is provided. The device comprises a laser light source for outputting laser light beam and a laser driver for driving the laser light source; an optical modulator which receives and modulates the laser light beam output by the laser light source; a packet data source for outputting a packet data stream; and a modulator driver for receiving the packet data stream output by the packet data source and for driving the optical modulator in response to the packet data stream resulting in that the optical modulator modulates the laser light beam in response to the packet data stream. A filter generates an envelope signal of the data packets in the packet data stream, and a switch switches the laser driver in response to the envelope signal.

Laser device for optical data transmission

An optical telecommunications network (), of metropolitan area type, having a ring type core (), and secondary rings (). In each sending access node (), transmitters () for sending information-carrying optical signals use a wavelength belonging to a group of wavelengths dedicated to the secondary ring () to which this sending access node () is connected. In each destination access node (), receivers () are capable of receiving all the wavelengths used by sending nodes () of the network. Communication nodes () comprise all-optical devices () for inserting, into the core fiber (), optical signals sent by a sending access node connected to the communication nodes. Optical couplers (), for taking from the core fiber () a so-called representative signal formed of a fraction of the power of each information-carrying signal, are respectively coupled to the receivers of the destination nodes.

Metropolitan area type optical telecommunications network comprising a ring type core

The invention relates to an optical amplifier device including a semiconductor optical amplifier component () including a guide active structure (), characterized in that the guide active structure () is subjected to a stress external to said component () coming from integrating said component () in said device, and in that said component () has a controlled sensitivity to the state of polarization of the light to be amplified in order to render the gain of said optical amplifier device insensitive to the polarization of said light to be amplified.

Optical amplifier device

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Paris, France

François Dorgeuille