Optical fiber and fiber grating type filter including the same

Details Optical fiber and fiber grating type filter including the same Optical fiber and fiber grating type filter including the same

2007-04-10

2007-04-10

Wood, Kevin S. (Department: 2874)

Optical waveguides

With optical coupler

Input/output coupler

C385S144000, C385S123000

Reexamination Certificate

active

10747085

ABSTRACT:
The present invention relates to an optical fiber having a structure which allows further improvements to be made both in terms of lower reflectance and narrower bandwidth, and to a fiber grating type filter including the optical fiber. The optical fiber applied to the fiber grating type filter comprises a core region extending along a predetermined axis, and a cladding region provided on an outer periphery of the core region. The core region does not contain any photosensitive dopant which contributes to predetermined wavelength light photosensitivity as a glass property, but a part of the cladding region contain such a photosensitive dopant. By means of this composition, it is possible to form a grating, which has a grating plane slanted by a predetermined angle with respect to the optical axis, in a part of the cladding region surrounding the core region.

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English Translation of Japanese Office Action dated May 19, 2006.

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