Alcatel Cit

Alcatel

Roland Uhel

Georges Grandpierre

Jean-Luc Pamart

Stephane Morin

Alistair J Price

Francois-Xavier Ollivier

An emitter of optical signals for optical fibers includes an electroabsorption modulator downstream of a laser and a Mach-Zhender modulator downstream of the electroabsorption modulator and controlled by at least one clock to eliminate for each pulse of the resulting signal from the first modulator a portion of signal in a time range including the rising edge and in a time range including the falling edge.

Signal emitter for optical fibers

Optical transmission method with reduced sensitivity to dispersion,

A system for re-establishing the transmission quality of a digital information transmission link including amplifier equipments in the event of failure of one or more amplifier equipments includes, associated with at least one of the amplifier equipments, a gain control device for varying the gain of the amplifier equipment in order to compensate for deterioration of the receive signal-to-noise ratio following failure of at least one other amplifier equipment. An error corrector coder at the send end of the link operates on the digital information to be transmitted and an error corrector decoder at the receive end of the link operates on the received digital information. The error corrector code used by the error corrector coder and decoder reduces or eliminate residual errors at the receiving end associated with residual deterioration of the receive signal-to-noise ratio not compensated by varying the gain.

System for re-establishing the transmission quality of a link including

Growing community of inventors

Clohars Carnoet, France

Roland Uhel