Reduction of linear birefringence in circular-cored single-mode fiber
AssigneeKVH Industries, Inc.
InventorsRichard Dyott, Sid Bennett
Life of this patent
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Abstract
A method is described for reducing the effect of linear birefringence in an optical fiber, in particular a circular-cored single-mode fiber. The invention may also be directed to an optical fiber having a reduced linear birefringence. A length of the optical fiber may be subdivided into a plurality of sections and a twist having a predetermined sense of rotation and a twist angle may be introduced between the sections. Fibers of this type may find applications, for example, in fiber-optic current and magnetic field sensors.
Claims11
A method of reducing the effect of linear birefringence in an optical fiber, comprising:
- (a) heating a length of the optical fiber;
- and
- (b) introducing into the length of said fiber a twist having a predetermined sense of rotation and a twist angle, thereby creating a plurality of sections in said fiber;
- and
- (c) reversing the sense of rotation of the twist between sections after an accumulated twist for previously introduced twists between sections is substantially equal to 90°.
A method of reducing the effect of linear birefringence in an optical fiber, comprising:
- (a) heating a length of the optical fiber;
- and
- (b) introducing into the length of said fiber a twist having a predetermined sense of rotation and a twist angle, thereby creating a plurality of sections in said fiber;
- wherein the twist angle between respective ends of the adjacent sections is substantially equal or less than 90°.
An optical fiber with reduced effects of linear birefringence, comprising a length of optical fiber, wherein said fiber comprises a twist separating said fiber into a plurality of fiber sections, and wherein said twist is formed by heating said fiber and wherein a twist angle between respective ends of the adjacent sections is substantially equal to 90°.
Dependencies are inferred from the claim text.