All-fiber current sensor

Details All-fiber current sensor All-fiber current sensor

2008-03-11

2009-02-17

Font, Frank G (Department: 2883)

Optical waveguides

Polarization without modulation

C385S012000, C385S014000, C385S039000, C385S041000, C385S042000, C385S043000, C385S044000, C385S045000, C385S129000, C385S130000, C385S131000, C385S132000

Reexamination Certificate

active

07492977

ABSTRACT:
Embodiments of the present invention provide a current sensing device. The current sensing device includes, inter alia, a three-by-three (3×3) optical coupler made of polarization-maintaining (PM) fibers and thus being a PM fiber coupler; a light source and at least one photon-detector connected to a first side of the 3×3 PM fiber coupler; and a fiber coil connected to a second side of the 3×3 PM fiber coupler. The 3×3 PM fiber coupler is adapted to split an input light from the light source into first and second optical signals while maintaining their respective polarization directions; and is adapted to cause coherent interference of third and fourth optical signals, related respectively to the first and second optical signals and received from the fiber coil.

REFERENCES:
patent: 5479094 (1995-12-01), Esman et al.
patent: 6188811 (2001-02-01), Blake
patent: 6636321 (2003-10-01), Bohnert
patent: 7046867 (2006-05-01), Bohnert et al.
patent: 7075286 (2006-07-01), Bohnert

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