Optical fiber with fresnel diffraction

Details Optical fiber with fresnel diffraction Optical fiber with fresnel diffraction

2008-05-27

2008-05-27

Sanghavi, Hemang (Department: 2874)

Optical waveguides

Optical fiber waveguide with cladding

C385S033000, C385S124000, C385S127000, C359S652000

Reexamination Certificate

active

07379645

ABSTRACT:
An optical fiber being optically transmissive at a predetermined wavelength of light λ and comprising a plurality of coaxial layers. Each layer having an optical path length that varies radially, the coaxial layers being arranged to give the fiber a refractive index profile which, in use, causes sufficient Fresnel diffraction of the light such that it is guided in the fiber. The refractive index of a cladding region (60) is intermittently suppressed by controlling heating of the preform tube, thus forming a chirped saw-tooth profile (70). The optical fiber may include a lens. In this case, each of the layers has an optical path length that increases gradually outwardly by substantially n×λ/2 (n: integer).

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patent: 4645523 (1987-02-01), Howard et al.
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patent: 4936889 (1990-06-01), Greenham et al.
patent: 5579427 (1996-11-01), Rusanov et al.
patent: 2242755 (1991-10-01), None

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