Method and apparatus for measuring eccentricity in a optical...

Optics: measuring and testing – For optical fiber or waveguide inspection

Reexamination Certificate

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Reexamination Certificate

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06937325

ABSTRACT:
A method and an apparatus for obtaining measurements of eccentricity in optical fibers, from which the spin imparted to the optical fiber can be ascertained. The method and apparatus enable eccentricity to be measured in such a way that this measurement can be utilized to determine the amount of spin imparted to an optical fiber as the optical fiber was being drawn, although the eccentricity measurement may be used for purposes other than to determine the amount of spin in the fiber. By viewing the fiber from one or more positions along the length of the fiber, the eccentricity of the fiber as a function of position along the length of the fiber can be determined. The amount of spin in the fiber can then be determined from the eccentricity measurement.

REFERENCES:
patent: 4882497 (1989-11-01), Inoue et al.
patent: 5943466 (1999-08-01), Henderson et al.
patent: 6020584 (2000-02-01), Brarens et al.
patent: 2001013034 (2001-01-01), None
patent: 11-176205 (2001-12-01), None
MJ Marrone et al.; “Internal rotation of the birefringence axes in polarization-holding fibers”; Optics Letters; 1987; vol. 12, No. 1; pp. 60-62.

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