Decreasing the effects of linear birefringence in a fiber-optic sensor by use of Berry's topological phase
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United States of America Patent
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Mar 16, 2004
Grant Date -
Feb 14, 2002
app pub date -
Aug 2, 2001
filing date -
Aug 2, 2000
priority date (Note) -
Expired
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Abstract
The invention relates to the field of fiber optics, and more particularly to birefringence in single-mode fibers. The sensitivity of a fiber optic sensor coil for a current sensor may be increased by winding the sensing fiber, without torsion, around a current-carrying wire to form the coil, wherein the pitch angle of the fiber may be selected to result in a phase shift due to Berry's phase of circularly polarized light propagating through the fiber. Preferably, the pitch angle may be approximately 60.degree..
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