Abstract: An apparatus for proof testing an optical waveguide fiber includes a first capstan defining a first outer diameter and a continuous first capstan belt under tension and in contact with the first outer diameter of the first capstan. The contact between the first capstan belt and the first capstan defining a first arc of contact, and the first capstan belt defining a first width, a first thickness and a first length. The apparatus further includes a second capstan defining a second outer diameter and a continuous second capstan belt under tension and in contact with the outer diameter of the second capstan. The contact between the second capstan belt and the second capstan defining a second arc of contact, second capstan belt defining a second width, second thickness and a second belt length. The first arc of contact being equal to or greater than about 105° and the second arc of contact being at least 20° greater than the first arc of contact.

Abstract: The invention relates to a method of winding optical fiber onto a spool. The method includes varying a target, tension applied to a fiber as the fiber accumulates onto the spool such that the percentage change in lateral load is greater than about −3.4% for each change of about 0.25″ in pack radius. The method also includes varying the target tension such that the change in lateral load per change in pack radius includes an amount greater than about −18.0 N/m2. Additionally the invention includes varying the target tension applied to the optical fiber as the fiber accumulates onto the spool, such that the target tension applied to the fiber at the end of winding fiber onto the spool is at least about 0.1% or greater than the target tension at the start of winding fiber onto the spool.

Abstract: An apparatus for proof testing an optical waveguide fiber includes a first capstan defining a first outer diameter and a continuous first capstan belt under tension and in contact with the first outer diameter of the first capstan. The contact between the first capstan belt and the first capstan defining a first arc of contact, and the first capstan belt defining a first width, a first thickness and a first length. The apparatus further includes a second capstan defining a second outer diameter and a continuous second capstan belt under tension and in contact with the outer diameter of the second capstan. The contact between the second capstan belt and the second capstan defining a second arc of contact, second capstan belt defining a second width, second thickess and a second belt length. The first arc of contact being equal to or greater than about 105° and the second arc of contact being at least 20° greater than the first arc of contact.

Abstract: A method of winding optical fiber onto a spool is disclosed. The method includes varying a target tension applied to a fiber as the fiber accumulates onto the spool such that the percent change in lateral load is greater than about −3.4% for each change of about 0.25″ in pack radius. The disclosed invention also includes varying the target tension such that the change in lateral load per change in pack radius comprises an amount greater than about −18.0 N/M2. Additionally the invention includes varying the target tension applied to the optical fiber as the fiber accumulates onto the spool, such that the target tension applied to the fiber at the end of winding fiber onto the spool is at least about 0.1 % or greater than the target tension at the start of winding fiber onto the spool.

Abstract: The invention includes an optical waveguide whipping end cutting apparatus. The apparatus includes an active cutting element. The element is positioned to cut a segment from a whipping end of an optical fiber, while the fiber is being wound onto a rotating spool. This apparatus will prevent fiber whip. The invention also includes a method of cutting a whipping end from an optical fiber. The method includes removing a segment of the end of the fiber with an active cutting element. A method of cutting an optical fiber while winding the fiber onto a storage spool is further discussed. The fiber has a whipping end and a wound segment. The method includes separating the whipping end of the fiber from the wound segment with an active cutting element. Furthermore, the invention includes a method of reducing fiber whip damage to fiber wound on a spool. This includes engaging an active cutting element on the fiber being wound onto the spool, and removing a whipping end from the fiber.

Abstract: An apparatus is provided for applying a tensile force along the longitudinal axis of a cane assembly during the deposition of soot thereon to produce an optical fiber preform. Fiber drawn from such a preform exhibits improved core/clad concentricity. The tensile force may be applied at one or both ends of the cane assembly, with application at both ends being preferred. The tensile force may be varied during the deposition of soot. The cane assembly may be annealed prior to beginning the deposition of soot thereon.

Abstract: A method and apparatus is provided for controlling the diameter of a coated optical waveguide fiber. The viscosity profile of the coating material is controlled by adjusting the temperature of a portion of the coating assembly based on a measurement of the diameter of the coated fiber. By controlling the viscosity profile of the coating material, the amount of coating applied to the fiber is controlled,, thereby determining the diameter of the coated fiber.