Fiber Bragg grating element
AssigneeFurukawa Electric Co., Ltd.
InventorsYasuo Uemura, Kazuhiko Kashima, Toshiyuki Inukai
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Abstract
The present invention provides a fiber Bragg grating element which is simply configured and capable of obtaining a high cut-off amount exceeding 40 dB in a wide range. A fiber Bragg grating element of the present invention has a plurality of gratings formed in an optical waveguide having a core and a cladding around the core thereby to perform high rejection filtering on an input optical signal over a desired bandwidth˜ the gratings being formed with a grating pitch between adjacent two of the gratings increasing toward a center in a longitudinal direction of the optical waveguide.
Claims10
A fiber Bragg grating element performing high rejection filtering on an input optical signal over a predetermined bandwidth, the fiber Bragg grating element comprising:
- a plurality of gratings formed in an optical waveguide having a core and a cladding around the core, the plurality of gratings formed continuosly along a predetermined portion of said optical waveguide, said predetermined portion having a beginning, a center, and an end,
- the gratings being formed with a grating pitch between adjacent two of the gratings increasing toward the center of the predetermined portion in a longitudinal direction of the optical waveguide.
A fiber Bragg grating element performing high rejection filtering on an input optical signal over a predetermined bandwidth, the fiber Bragg grating element comprising:
- a plurality of gratings formed in an optical waveguide having a core and a cladding around the core, the plurality of gratings formed along a predetermined portion of said optical waveguide, said predetermined portion having a beginning, a center, and an end,
- the optical waveguide having two optical fibers bonded at respective ends to each other, each of the respective ends having a subset of the plurality of gratings, and
- respective subsets of the gratings being formed continuosly between the optical fibers with a grating pitch between adjacent two of the gratings increasing toward the respective ends, said respective ends being bonded together.
Dependencies are inferred from the claim text.