Alcatel

Alcatel Fibres Optiques

Avanex Corporation

Alcatel Submarine Networks

Bruno Lavigne

Dominique Chiaroni

Thierry Zami

Claude Brehm

Olivier Leclerc

Jean-Yves Boniort

Christopher Janz

Lionel Vandenbulcke

Bernd Sartorius

Patrick Brindel

Fabrice Devaux

Jean-Christophe Antona

B&eacute;atrice Dagens

David Wolfson

Jean-Baptiste Pomet

Tina Fjelde

Fabien Seyfert

Patricia Guerber

Carsten Bornholdt

Jean-Luc Moncelet

Stephan Bauer

Alex Bombrun

Allan Kloch

A method of operating a WDM transmission system with at least one transmitter and at least one receiver connected by means of a dispersive transmission line. The proposed method comprises the successive steps of successively: a) setting a tunable dispersion pre-compensation value at a transmitter-side Tunable Dispersion Compensation Module in operative connection with the transmitter to a first predetermined value (PRE&#xb0;); b) setting or adjusting a tunable dispersion post-compensation value at a receiver-side Tunable Dispersion Compensation Module () in operative connection with the receiver to a second value (POST&#xb0;) in order to optimize at least one characteristic (monitored performance like BER, eye opening, Q factor BER) of a transmitted signal at the receiver; and then c) simultaneously tuning the transmitter-side Tunable Dispersion Compensation Module and the receiver-side Tunable Dispersion Compensation Module with opposite respective dispersion shifts in order to further optimize said characteristic of the transmitted signal.

Method of operating and optimising a WDM transmission system and computer program product

A wavelength converter for binary optical signals includes an interferometer structure () for generating an output signal by modulating a received local signal (LS) according to the modulation of a fUrther received first input signal (IS). When such interferometer structures () are operated in a standard mode it is known in the art to control the power of the input signal such that the extinction ratio of the output signal is kept minimal. The invention also controls the power of the input signals to achieve the minimal extinction ratio when the wavelength converter and in particular the interferometer structure () is operated in a differential mode receiving two input signals.

Wavelength converter

An all-optical clock recovery system for recovering the clock from a received optical signal with a short response time and without patterning effects includes a first optical clock recovery device adapted to supply a first optical clock signal in response to the received optical signal and a second optical clock recovery device adapted to supply a second optical clock signal in response to the first optical clock signal. Applications include regenerating optical packets in asynchronous optical packet-switched telecommunication networks.

Optical clock recovery device for recovering the clock from an optical signal

The present invention propose to use an optical multiplexer associated with an optical clock as a wavelength converter. Each RZ coded tributary will be carried by a single wavelength (channel) passively interleaved with the others without interferometric interaction hence achieving a not necessarily perfect OTDM. This input data stream as optical data signal composed of different wavelengths is then launched on at least one data access of said optical multiplexer used as a wavelength converter. An optical clock at the desired bit-rate is launched on the probe access of said optical multiplexer synchronously to the multi-wavelength data stream. At the output, the initial clock wavelength is converted on data signal using the gain conversion property of the optical multiplexer. In such a way, a data stream of substantially higher bit-rate is obtained while due to a very precise synchronization a lost of data is minimized.

All-optical high bit-rate multiplexer

An optical signal regeneration device having an interferometric structure with two arms. Each of the arms has a medium, the optical power output of which is variable with the optical power input. The first arm receives, through an input coupler, a continuous wave and the signal to be regenerated. The second arm receives through the input coupler, a continuous wave signal and a clock signal. A filter, centered on the continuous wave wavelength, receives the output signal of the interferometric structure through the coupler. The filter output signal constitutes the regenerated R signal.

3R optical signal regeneration

To format a power modulated input optical signal, at the same time as improving its power dynamic range and the extinction rate of the output signal, a device for formatting binary optical signals includes a first stage for supplying a modulating signal having stabilized high levels as a function of the input signal and an interferometer structure second stage receiving the modulating signal and a probe wave power modulated in phase opposition to the modulation of the modulating signal. The low and high levels of the probe wave are stabilized. Applications include optical transmission.

Device for formatting binary optical signals

Method of applying an amorphous boron-based protective coating to an

Optical fiber coated with an amorphous boron protective layer, and a

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Antony, France

Bruno Lavigne