Alcatel

Alcatel Cit

Jean-Paul Hebert

Thomas Ducellier

Alexis Lestra

Philippe Brosson

Michel Goix

The invention relates to a light emitter device comprising an integrated component having a laser section provided with an oscillator section designed to supply a laser wave, and a modulator section. In order to control the light frequency of the emitted modulated wave, an electronic circuit controls the current of the laser section in response to a measurement of the amplitude of the modulation of the voltage induced across the terminals of the laser section by the modulation section.

Light emitting device having an integrated component including at least

An optical preamplifier device for a light receiver, the device including a first optical amplifier. The first optical amplifier is coupled to an input of an optical filter centered around a fixed wavelength .lambda..sub.o via a wavelength conversion device for converting wavelength to the fixed wavelength .lambda..sub.o of the filter, thereby enabling the device to be made independent of the wavelength .lambda..sub.i of the signal.

Optical preamplifier device having a wave length conversion device

An input signal provided by a generator is applied to a laser emitting diode via a predistortion circuit for improving the linearity of the response of the source. The predistortion circuit includes a linear pi attenuator member constituted by resistances and a non-linear compensating element constituted by a Schottky diode connected in parallel with said attenuator member. The invention is particularly applicable to making light transmitting cable heads for optical fiber telecommunications systems.

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Saint-Remy les Chevreuse, France

Jean-Paul Hebert