Fiber with multiple overlapping gratings

Details Fiber with multiple overlapping gratings Fiber with multiple overlapping gratings

1995-01-10

1997-05-06

Ngo, John

Optical waveguides

With optical coupler

Input/output coupler

385 24, G02B 634

Patent

active

056279272

ABSTRACT:
Two or more overlapping fiber gratings are formed in a section of optical fiber to sense environmental effects that can vary the spacing between the lines of the grating to vary the center frequency of the spectral envelope, either reflected or passed thereby. The fiber gratings if properly oriented can respond to strain applied thereto in x, y, and z directions and temperature so that a three axis sensor can be formed at a short length of optical fiber and be calibrated for temperature. The multiple optical gratings are formed by sensitizing an optical fiber to light and then using two or more light interference patterns to form the gratings.

REFERENCES:
patent: 5166940 (1992-11-01), Tumminelli et al.
patent: 5457760 (1995-10-01), Mizrahi

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