Method of making an index grating in an optical fiber, and a quasi-distributed array of sensors formed in said fiber
AssigneeBertin & Cie
InventorPierre Sansonetti
Life of this patent
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Abstract
An array of sensors quasi-distributed in an optical fiber (10), the sensors being delimited along the fiber by intermode coupling zones which are made by exposing the optical fiber (10) to a laser beam (16) through a mask (18) having periodic spatial transmission tuned to the difference between the propagation constants of the two modes to be coupled.
Claims12
A method of making an index grating in the core of a multimode optical fiber, the method comprising the steps of applying a mask against the optical fiber, the mask having a spatial periodic transmission, and irradiating the optical fiber through the mask by a laser beam.
A quasi-distributed array of sensors in an optical fiber, wherein the sensors are defined by segments of the optical fiber which are delimited by periodic index grating zones for intermode coupling in the core of the optical fiber, said index grating zones being formed by applying a mask having a spatial periodic transmission against the optical fiber and by irradiating the optical fiber through the mask by a laser beam.
Dependencies are inferred from the claim text.