Optical fiber reflective filter

G - Physics – 02 – B

Patent

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Details

88/0.1, 88/97.2

G02B 5/26 (2006.01)

Patent

CA 1112489

TITLE OPTICAL FIBER REFLECTIVE FILTER INVENTORS Kenneth O. Hill Brian S. Kawasaki Derwyn C. Johnson Yoshimasa Fujii ABSTRACT OF THE DISCLOSURE The optical reflective filter is made from a photosensitive optical fiber having a cladding and a core including germanium. Refractive index perturbations are light induced in the fiber in the region of the guided light. The perturbations can be made to have a constant or a varying periodicity, or a series of constant periodicities. The filters are made from single mode or low order mode fibers having germanium doped silica or germania cores. The center frequency for reflective band or bands has a wavelength in the 400 nm to 550 nm range. The reflective band or bands in the filter can be shifted by stretching the filter.

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