Optical fiber with built-in grating and optical fiber for...

Details Optical fiber with built-in grating and optical fiber for... Optical fiber with built-in grating and optical fiber for...

2005-01-11

2005-01-11

Kang, Juliana K. (Department: 2874)

Optical waveguides

With optical coupler

Input/output coupler

C385S123000, C385S124000, C385S126000

Reexamination Certificate

active

06842566

ABSTRACT:
The present invention provides an optical fiber equipped with a grating that functions as a narrow-band loss filter. The optical fiber has a core, an inner cladding, an intermediate cladding, and an outer cladding, which have refractive indexes n0, n1, n2, and n3, respectively, the refractive indexes having a relationship of n0>n3≧n1n2. At least a part of the inner cladding has a grating. The refractive index of the intermediate cladding is lower than the refractive indexes of the inner cladding and the outer cladding such that a recession is formed in the refractive index profile of the clad. The grating is provided on the inner side relative to the recession.

REFERENCES:
patent: 5721800 (1998-02-01), Kato et al.
patent: 6175680 (2001-01-01), Arai et al.
patent: 6314221 (2001-11-01), Riant et al.
patent: 6321007 (2001-11-01), Sanders
patent: 6400865 (2002-06-01), Strasser et al.
patent: 20010026396 (2001-10-01), Enomoto et al.
patent: 20020122624 (2002-09-01), Jang

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