Alcatel

Alcatel N.v.

Jean-Claude Jacquinot

Amaury Jourdan

Michel Sotom

Ludovic Noirie

Jean-Michel Gabriagues

Patrick Brindel

Arnaud Bisson

Jean-Baptiste Jacob

Fabrice Devaux

Guy Le Roy

Guy Soulage

The invention is also related to devices for a synchronization of data in an optical WDM transmission system, consisting of the following parts: A wavelength demultiplexer () for demultiplexing the incoming data stream in the synchronizer, delay lines () for the individual wavelength channels, a multiplexer (), a modulator () modulated by a high frequency clock signal () and at least one photodetector () tapped to output line (B) where the photodetector () is connected to an electronic control circuit () which is connected to the findividual delay lines () for an automatic delay control.

Method for adjusting time delays and device for synchronization of channels in a WDM system

A device for erasing overhead modulation of an optical signal, wherein said optical signal is injected into an optical device able to modulate the optical signal (for example a semi-conductor optical amplifier driver by a bias control) and for which one an automatic gain control does not need to detect the residual overhead modulation, is characterised in that said bias control means applies to said amplifier a compensation voltage presenting a modulation out of phase with respect to said overhead modulation, and in that modulation index of said compensation voltage is (substantially) proportional to the modulation index of said optical signal.

Device for erasing overhead modulation of an optical signal

The invention relates to a wavelength converter including an interferometer structure for delivering an output optical signal, in which converter a first branch contains a first semiconductor optical amplifier and a second branch contains a second semiconductor optical amplifier, the amplifiers being coupled to a common probe laser, and said first amplifier being organized to receive a modulating input signal, said converter including regulator means for acting on the total optical power delivered to said amplifier in response to a negative feedback signal representative of the extinction ratio of the output signal. The invention is applicable to making routing systems using wavelength-division multiplexing.

Wavelength converter for binary optical signals

An optical wavelength converter has an optical signal input adapted to receive an optical signal whose wavelength is to be converted, an optical signal output adapted to emit an optical signal whose wavelength is the required wavelength, after conversion, and at least one control electrode for applying at least one electrical signal to control the wavelength of the output optical signal. The converter is controlled by a method which comprises a calibration phase for establishing a law linking at least one of said control electrical signals to said required output wavelength and storing said law in a storage device, and an operative phase for addressing said storage device using the required output wavelength and numerical-analog conversion of the data from the storage device addressed in this way for application to said control electrode(s).

Optical wavelength converter control method and device

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Le Kremlin Bicetre, France

Jean-Claude Jacquinot