Thomson-csf

Guy Chevalier

Luigi d'Auria

Claude Puech

Jean Pierre Huignard

Jean-Claude Reymond

Michel Favreau

Jean Pierre Lacotte

Optical fibre delay line device for producing a delay on a guided light pulse proportional to the length of the optical fibre, comprising single means for the emission and detection of the light pulse, constituted by a semiconductor laser diode also having photodetecting properties and coupled to one of the ends of the optical fibre. The other end of the optical fibre is rendered reflective or is coupled to a waveguide of variable length, which also has a reflecting end, in such a way that the light pulse traverses the length of the optical fibre twice.

Device with circulating optical delay line

A cinematographic film to be reproduced by television is driven at constant speed in synchronism with the sweep cycle of one or more camera tubes each positioned to pick up images projected upon a receiving surface thereof whose luminous persistence equals at least a sweep cycle. The film is periodically transluminated, during the retrace phase of the scanning beam, by a light pulse emitted by an electroluminescent diode -- or by a cluster of such diodes operating on different wavelengths -- defining a quasi-pinpoint light source, the diode being excited by an energizing pulse whose length does not exceed the duration of a line scan of the camera tube.

Telecinema system using electroluminescent diodes

In the telecommunication system using optical fibers, each terminal or repeater station comprises negative feedback via an optical channel, the output electroluminescent diode being coupled to the input photodiode by an optical fiber.

Growing community of inventors

Paris, France

Guy Chevalier