Optical waveguides – Miscellaneous
Reexamination Certificate
2006-04-25
2006-04-25
Lee, John D. (Department: 2874)
Optical waveguides
Miscellaneous
C057S012000, C065S438000, C242S472100, C385S134000
Reexamination Certificate
active
07035525
ABSTRACT:
Methods and apparatuses negate a measured mechanical twist of an optical fiber by introducing a counteracting twist to bring the net mechanical twist closer to zero, which reduces the fiber's polarization mode dispersion (PMD). A spool of optical fiber having undesirable mechanical twist is mounted and fiber is drawn from the end of the spool to impart a specified counteracting mechanical twist. Additionally, the spool may be controllably rotated by a control system while optical fiber is drawn there from, allowing the system to generate a precise amount of counteracting mechanical twist in the fiber.
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Schub, et al., “Polarization Mode Dispersion in Spun Fibers with Different Linear Birefringence and Spinning Parameters,” Journal of Lightwave Technology, vol. 16, No. 9, Sep. 1998, p. 1583-1588.
Garner, Jr. Harry Douglas
Hong Siu-Ping
Mast Stephen
McCurdy Alan H.
Popwell John
Fitel USA Corp.
Lee John D.
Stein James D.
Sutherland & Asbill & Brennan LLP
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