Abstract:
A method for producing an optical fiber that includes a method for producing an optical fiber, said method comprising: (i) drawing a bare optical fiber from a preform along a first pathway at a rate of at least 10 m/sec; (ii) contacting said bare optical fiber with a region of fluid in a fluid bearing and redirecting said bare optical fiber along a second pathway as said bare optical fiber is drawn across said region of fluid cushion; (iii) coating the bare optical fiber; and (iv) irradiating said coated fiber in at least one irradiation zone to at least partially cure said coating, while subjecting the optical fiber to UV light.
Abstract:
A miniature x-ray tube capable of intra vascular use, as for irradiating the interior wall of a blood vessel to prevent restenosis, as well as uses in other natural or surgically-created body cavities, has a micro cathode preferably formed by MEMS techniques. The very fine wire of the cathode filament is formed on a semiconductor base and draws a current sufficiently low that lead wires in a cathode heater circuit, passing through a probe line connected to the x-ray tube, can be very small wires, which helps maintain sufficient dielectric spacing in the high voltage circuit handled by the same probe line. In a preferred embodiment the probe line comprises a glass fiber, providing needed dielectric strength and allowing for a direct seal to the x-ray tube. The glass fiber is held at a small diameter to allow flexibility for navigating small-radius turns within the vessels. In a preferred embodiment the fiber is overcoated with a high-dielectric polymer to significantly increase the dielectric strength of the overall cable, without adding significantly to stiffness. The high voltage ground conductor is a coaxial sheath on the outside of the polymer. Exterior to the ground conductor is a further flexible layer having paths for coolant.
Abstract:
An Apparatus for producing a low-PMD optical fiber, comprises a furnace (6) for melting a lower portion of an optical preform (3); a traction device (8) for pulling an optical fiber (4) from said lower portion of an optical preform; a spinning device (20) for imparting a substantially constant and unidirectional spin to the optical fiber as it is pulled, which causes the fiber to undergo an elastic torsion; a winding device (9) for winding the optical fiber onto a reel (10); and a twisting device (40) for imparting to the spun optical fiber a unidirectinal twist in a direction opposite said elastic torsion, so as to control the residual twist in the optical fiber.
Abstract:
A method of characterising one or more properties of optical fibres obtained from an optical preform, in which the optical fibre is subdivided into separate length portions by winding each of said separate length portions on a coil, which coil is encoded, after which one or more properties of an encoded length portion are measured.
Abstract:
The invention relates to a field emission display constructed using an array of fibers (15) and an orthogonal array of emitter electrodes (40). Each fiber (15) in the fiber array contains an extraction electrode (10), a high voltage electrode (20) and a phosphor layer (30). The array of emitter electrodes consists of carbon nanotube emitters attached to conductive electrodes (40). The emitter electrodes (40) are separated using non-conductive fibers (50). A getter material in the form of a wire (55) is placed within the array of emitter electrodes (40) to maintain a high vacuum within the display.
Abstract:
A method for reducing or preventing damage to a fibre, which damage occurs when a fibre breaks during winding or unwinding of the fibre, possibly via guide wheels, on or from a rotating spool, wherein an optical measuring device, which includes a light source and a detector, continuously measures the presence of the fibre at a location some distance away from the rotating spool without coming into physical contact with the fibre during measuring.
Abstract:
A distribution management optical fiber which can be manufactured easily and connected to another optical fiber easily, etc. The distribution management optical fiber is a quartz optical fiber which has a secured single mode at a predetermined wavelength within a signal wave band, and is composed of 1st parts with positive wavelength distributions and 2nd parts with negative wavelength distributions which are alternately arranged adjacent to each other. The distribution management glass fiber has a uniform additive concentration in a longitudinal direction and, on the other hand, the refractive indices or residual stresses of glass layers to which GeO2 is not added as an additive are adjusted so as to correspond to the 1st and 2nd parts.
Abstract:
When a base material (1) for an optical fiber is drawn to form an optical fiber (3), torsion is generated in the optical fiber (3). The outer diameter of the optical fiber (3) is continuously measured in the longitudinal direction of the optical fiber (3) from the different two directions in the plane perpendicular to the extending direction of the optical fiber (3) by means of a torsion measuring instrument (4). Thereby, the torsion of the optical fiber (3) is measured.
Abstract:
A method for producing an optical fiber having a low polarization dispersion characteristic achieved by suitable twisting the optical fiber even the optical fiber is produced at a fiber drawing speed of over 250 m/min and having a small variation in diameter and a small variation in the outside diameter in the length direction. The method comprising softening an optical fiber matrix by heating, drawing an optical fiber (11) downward from the matrix, covering the optical fiber (11) with a coating, axially twisting the optical fiber by means of a rocking guide roller (13) which periodically rocks is characterized in that the rocking amplitude at the roller face (13a) of the rocking guide roller (13) where the optical fiber (11) comes into contact first is in a range between +/-7 mm and +/-0.5 mm in a direction perpendicular to the vertical.