Optical fiber sensors, tunable filters and modulators using long

Details Optical fiber sensors, tunable filters and modulators using long Optical fiber sensors, tunable filters and modulators using long

1997-10-24

2000-05-02

Healy, Brian

Optical waveguides

Optical waveguide sensor

385 27, 385 28, 385 31, 385 37, 385123, 385127, 385128, 385141, 385 1, 385 2, 25022711, 25022714, G02B 600, G01J 104

Patent

active

06058226&

ABSTRACT:
An optical system for selectively filtering and modulating light transmitted through an optical fiber. A tunable optical filter is provided which is capable of selectively correcting, amplifying or modulating light within an optical fiber by selectively extracting light from the core of the fiber into the cladding where it may be acted upon using an active device. Where the active device includes an electrically sensitive material, a constant or varying voltage applied to the material causes the refractive index of the material to change, affecting the transmission of the light within the fiber. Various combinations of gratings and electrically driven elements can be combined to provide various types of filters, amplifiers, modulators and delay lines that are easily incorporated into an optical fiber line. Where the optically active material reacts to selected gases, liquids or radiation, the presence of such a gas, liquid or radiation may also change the refractive index of the material, providing an environmentally robust sensor.

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