Alcatel

Guy Soulage

Michel Sotom

Amaury Jourdan

Franck Bruyere

Pierre Sansonetti

Jean-Claude Jacquinot

The invention relates to an optical transmission system comprising a transmission line which includes at least one optical fiber amplifier. According to the invention, a stabilized gain optical amplifier is coupled to the input of the line, said stabilized gain amplifier including a local oscillator suitable for emitting an auxiliary compensation wave at a wavelength .lambda.loc which lies in the gain band of each optical fiber amplifier of the line. Provision is also made to modulate the pumping current of said stabilized gain amplifier to convey service information. The invention is applicable to optical transmission.

Optical transmission system with dynamic compensation of the power

To perform selective dropping and adding of channels of wavelength multiplexes without interposing active elements in the main transmission path, the apparatus comprises add-and-drop modules, each of which includes at least one stop filter provided with two opposite ports. An optical switch provided with a drop outlet is provided with drop inlets and with add outlets associated with the modules, and respectively coupled to the opposite ports of the filters. For each module, the switch is organized for selectively coupling one of its drop inlets to one of its add outlets and/or to the drop outlet.

Apparatus for adding and dropping wavelength multiplex channels

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.

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Vitry sur Seine, France

Guy Soulage