Optical fiber for reducing optical signal reflections

Details Optical fiber for reducing optical signal reflections Optical fiber for reducing optical signal reflections

1999-01-08

1999-10-19

Ngo, Hung N.

Optical waveguides

Optical fiber waveguide with cladding

385144, 385 43, 385126, G02B 610

Patent

active

059701978

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 highly doped wedges within a tapered end of the fiber. The highly doped wedges adjacent the light transmitting core serve 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 wedges are in proximity to the core due to the tapering. The wedges, which are 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.

REFERENCES:
patent: 3646473 (1972-02-01), Young
patent: 3774173 (1973-11-01), Love et al.
patent: 4533210 (1985-08-01), Jeskey
patent: 5594828 (1997-01-01), Nielsen et al.

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