Gaz De France

Philippe Di Bin

Paul Facq

Paul-Hubert Zongo

Thierry Pichery

Paul Faco

The invention relates to an optical fibre including, over a part of its length, variations of refractive index disposed in plane, parallel and periodic strata, of period I, which are inclined at an angle .alpha. in relation to the axis of the fibre. The normal to the strata forms a non-zero angle with the axis of the fibre. The invention also relates to the application of the invention optical fibre as a selective extractor of flux, a light injector, a coupler, a sensor and a polarizer.

Optical fibre incorporating a Bragg lattice and its application

This is a system of fibre optic sensors comprising at least one such fibre for measuring a physical or chemical parameter sensitive to the change in an environment (E) within which the sensor is placed, the said fibre comprising a cladding (3), a core (5) surrounded by this cladding, an axis (7) with a length in the direction of this axis, and, locally along its parts (9) with variations in optical thickness forming an optical diffraction grating (10), at least one part of the cladding (3) comprising in its composition an active material whose optical properties vary as a function of the change in the said parameter (P) within the environment where the sensor is placed. The active material may be a heteropolysiloxane.

Fiber optic sensor for measuring gas

Optical fibre device having a core and coaxial sheath. The core and coaxial sheath provides a light amplifier when optically pumped. Interfering optical waves incident to the fiber having a predetermined intensity and wavelength inscribe an ephemeral periodic index strata grating over at least part of the fiber core when the core is illuminated. In the absence of illumination by interfering waves, the grating disappears.

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Limoges, France

Philippe Di Bin