| 摘要 |
PCT No. PCT/GB97/00128 Sec. 371 Date Mar. 9, 1998 Sec. 102(e) Date Mar. 9, 1998 PCT Filed Jan. 17, 1997 PCT Pub. No. WO97/26571 PCT Pub. Date Jul. 24, 1997An optical fibre in a core and a cladding that includes an inner cladding region with a refractive index that is photosensitive to UV light, surrounded by a non-photosensitive outer cladding region. Refractive index gratings can be written into the cladding region. Also, the refractive index of the inner region can be altered by exposure to UV light to achieve mode matching at a splice between fibres with different core diameters. An optical fibre laser is disclosed with integral refractive index gratings in the cladding of a fibre with an optically active core.
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