Optical waveguides – Having particular optical characteristic modifying chemical... – Of waveguide core
Patent
1997-05-22
1999-07-20
Ngo, Hung N.
Optical waveguides
Having particular optical characteristic modifying chemical...
Of waveguide core
385127, 385144, G02B 600
Patent
active
059266007
ABSTRACT:
Attenuation of an optical signal at the end of an optical fiber is achieved by positioning a high absorption region at the end of the fiber. A first embodiment teaches a highly doped annulus within a tapered end of the fiber. The highly doped annulus about the light transmitting core serves to absorb light at the end of the fiber. The light transmitting core of the fiber is reduced in diameter due to the tapering, causing the field of light to expand beyond the core. The highly doped annulus is in proximity to the core due to the tapering. The annulus, which is preferably heavily doped with a rare earth such as erbium, absorbs the escaping light in sufficient quantities, both in the initial pass through the tapered region and again upon reflection of the light at the end of the tapered region, such that the attenuation of the reflected light is within acceptable limits without regard to the condition of the fiber's end surface.
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Litton Systems Inc.
Ngo Hung N.
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