Optical fiber sensor having an active core

Details Optical fiber sensor having an active core Optical fiber sensor having an active core

1992-03-18

1993-09-28

Gonzalez, Frank

Optical waveguides

Optical fiber waveguide with cladding

385126, 385127, 385128, 385142, 372 6, G02B 616, G02B 622

Patent

active

052492516

ABSTRACT:
An optical fiber is provided comprising an active fiber core which produces waves of light upon excitation. A factor ka is identified and increased until a desired improvement in power efficiency is obtained. The variable "a" is the radius of the active fiber core and "k" is defined as 2.pi..lambda., wherein .lambda. is the wavelength of the light produced by the active fiber core. In one embodiment, the factor ka is increased until the power efficiency stabilizes. In addition to a bare fiber core embodiment, a two-stage fluorescent fiber is provided wherein an active cladding surrounds a portion of the active fiber core having an improved ka factor. The power efficiency of the embodiment is further improved by increasing a difference between the respective indices of refraction of the active cladding and the active fiber core.

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