Optical fiber gratings with azimuthal refractive index...

Details Optical fiber gratings with azimuthal refractive index... Optical fiber gratings with azimuthal refractive index...

2006-08-01

2006-08-01

Connelly-Cushwa, Michelle (Department: 2874)

Optical waveguides

With optical coupler

Input/output coupler

C385S123000, C385S124000

Reexamination Certificate

active

07085451

ABSTRACT:
The present invention relates to a type of optical fiber grating having an azimuthal refractive-index perturbation. The optical fiber includes a fiber grating that has a plurality of grating elements formed therein. At least one of the grating elements has a spatially varying index of refraction that varies azimuthally about the centerline of the optical fiber. The fiber grating acts as a band-stop optical spectral filter. In addition, since fiber-cladding modes are weakly-guided modes, their power can be easily dissipated by scattering, bending, stretching, and/or rotating the optical fiber. Multiple configurations of these gratings within an optical fiber are given. Methodologies are given for the fabrication of these gratings. Devices are presented which can dynamically attenuate, tune, switch, or modulate the wavelength spectral characteristics of an optical signal.

REFERENCES:
patent: 3982916 (1976-09-01), Miller
patent: 6768851 (2004-07-01), Chiang et al.
patent: 6778747 (2004-08-01), Bhagavatula et al.

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