公开(公告)号：EP0865621A4

公开(公告)日：1999-05-12

申请号：EP97936316

申请日：1997-07-29

Applicant: CORNING INC

Inventor： COOK THOMAS A ,  MODAVIS ROBERT A

IPC: G02B6/34 ,  G02B5/18 ,  G02B6/02 ,  G02B6/10 ,  G02F1/225

CPC classification number: G02B6/02152 ,  G02B6/02138 ,  G02B6/02142

Abstract: A variable period amplitude grating mask (10) for use in making a long period Bragg grating is realized by a helically coiled spring (14). Stretching or compressing the spring changes the periodicity of the mask (10). A photosensitive optical waveguide (100), planar or fiber, is positioned within the spring coils (16) along the major axis of the spring (14). Actinic radiation is incident on the masked waveguide, and induces an index of perturbation in the waveguide having the periodicity of the mask. Different spring coil sizes and/or orientation of the waveguide respect to the mask provide linear or nonlinear (chirped) grating periods.