Optical fiber, slanted optical fiber grating, band rejection...

Optical waveguides – Optical fiber waveguide with cladding

Reexamination Certificate

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C385S126000, C385S127000

Reexamination Certificate

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06931185

ABSTRACT:
Photosensitivity of an inner core which is disposed in a central portion of a core is low. Photosensitivity of an outer core which is disposed close to a cladding is high. In the cladding, photosensitivity of the inner cladding which is close to the core is high and photosensitivity of an outer cladding which is outside of the inner cladding is low. A plurality of slant optical fiber grating having different optical characteristics by using the optical fiber having such photosensitivity so as to form a gain equalizing optical filter. By doing this, it is possible to provide an optical filter having a slant optical fiber grating which can maintain a filtering characteristics in a narrow bandwidth and enlarge loss area.

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patent: 2002/0034368 (2002-03-01), Sheu et al.
patent: 1 116 968 (2001-07-01), None
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M.J. Holmes, et al., “Novel Fibre Design for Narrow-Band Symmetric Response Sidetap Filters with Suppressed Leaky Mode Resonance”, ECOC '99, vol. I, pp. 216-217 (Sep. 26, 1999).
Hewlett, et al. “Coupling Characteristics of Photo-Induced Bragg Gratings in Depressed-and Matched-Cladding Fibre”,Optical and Quantum Electronics, 28, 1641-1654 (1996).
Riant, et al., “Gain Equalization with Optimized Slanted Bragg Grating on Adapted Fibre for Multichannel Long-Haul Submarine Transmission”,Optical Fibre Communication Conference, 147-149 (1999).

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