Fiber optic system and method

Optical waveguides – With optical coupler – Input/output coupler

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Details

25022714, 385 12, G02B 600, G02B 636

Patent

active

052747212

ABSTRACT:
A fiber optic system and method in which the transmission of light through a fiber optic core of a fiber optic element is stabilized and optimized by eliminating the destabilizing effect of light independently propagated along the clad of the fiber optic element. The propagation of light along the clad may be essentially eliminated by a field stop member disposed between a light-receiving end of the fiber optic element and an LED light source, whereby light from the LED is entirely shielded from the clad. The field stop member is particularly effective when used in a fiber optic sensor, wherein the effect of clad light on transmission of light through the core is particularly destabilizing. Alternative structures for mitigating or eliminating the destabilizing effect of clad light are also provided in the form of alterations of the clad structure, or by providing a clad light stop diaphragm at the light-emitting end of the fiber optic element. Also provided is an aperture stop member, which may or may not be integrally formed with the field stop member, to optimize light propagation along the core by focusing light from an LED onto the light-receiving end of the core.

REFERENCES:
patent: 4270049 (1981-05-01), Tanaka et al.
patent: 4846548 (1989-07-01), Klainer
patent: 4893894 (1990-01-01), Caimi

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