METHOD OF FORMING FIBER BRAGG GRATING WITH PHASE SHIFT Russian patent published in 2018 - IPC G02B6/28 G02B5/18 

FIELD: fiber optics.

SUBSTANCE: invention relates to the field of fiber optics and concerns a method of forming a fiber Bragg grating (FBG) with a phase shift. Method includes an impact on the optical fiber, with the fiber Bragg diffraction structure recorded therein, electric arc welding machine. Phase shift is formed in a fiber Bragg diffraction structure obtained using a Talbot interferometer. To form a structure in the optical fiber, the first FBG is recorded, optical fiber with induced FBG is shifted along its axis by a distance greater than the length of one FBG, but not exceeding the sum of the length of one FBG and the length of the temporal coherence of the radiation reflected from the gratings. Then write the second Bragg grating, the characteristics of which are identical to the characteristics of the first grating. Impact of the electric arc of the welding machine on the optical fiber is carried out in the center of the distance between the two recorded FBGs to obtain the spectral response of the lattice, indicating the occurrence π-shift.

EFFECT: technical result consists in simplifying the manufacturing technology, obtaining a narrower transmission area and increasing the diffraction efficiency.

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