Method of making an index grating in an optical fiber, and a quasi-distributed array of sensors formed in said fiber

摘要

PCT No. PCT/FR91/00083 Sec. 371 Date Oct. 3, 1991 Sec. 102(e) Date Oct. 3, 1991 PCT Filed Feb. 5, 1991 PCT Pub. No. WO91/12545 PCT Pub. Date Aug. 22, 1991.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.