Abstract:
According to some embodiments a method of processing an optical fiber comprises the steps of: (i) drawing the fiber at a drawing rate of at least 30 m/sec; and (ii) cooling the drawn fiber in a gas at an average cooling rate less than 5000 °C/s, such that said cooling reduces the temperature of the fiber from an entering temperature in the range between 1500 °C and 1700 °C to another temperature in the range between 1200 °C and 1400 °C, the gas being at a temperature between 800 °C and 1500 °C; and the thermal conductivity K of the gas being not greater than 1.5xl0" 4 cal/cm-s-K for at least one temperature within a range of 800 °C to 1500 °C at one atm (atmosphere) pressure absolute.
Abstract:
According to embodiments described herein, a coated optical fiber may include a first coated optical fiber segment, a second coated optical fiber segment, and a splice-junction coating. The end portion of the first fiber segment and the end portion of the second fiber segment may abut one another end-to-end. The splice-junction coating may encapsulate the first end portion and the second end portion and contact the at least one coating of the first coated optical fiber segment and the at least one coating of second coated optical fiber segment. The splice-junction coating may be a cured polymer product of a precursor composition. The precursor composition may include from 0 wt% to 1 wt% of total oligomers and at least 90 wt% of total monomers. A Young's modulus of the cured polymer product may be greater than or equal to 1800 MPa.
Abstract:
Disclosed herein is a coating composition comprising a silsesquioxane component having one or more reactive functional groups that render it curable using ultraviolet radiation; where the one or more reactive functional groups are selected from the group consisting of an acrylate, a vinyl ether, or an epoxy; and optionally, a co-reactive non-silsesquioxane monomer and/or an oligomer having one or more reactive functional groups that are curable using ultraviolet radiation and are selected from the group consisting of free radically curable acrylates, cationically curable epoxies, and cationically curable vinyl ethers; where the coating composition is disposed and cured on an optical article; where the optical article is at least one of an optical fiber or an optical planar waveguide; and where the average functionality of the composition is greater than one.
Abstract:
Fiber coatings with low Young's modulus and high tear strength are realized with coating compositions that include an oligomeric material formed from an isocyanate, a hydroxy acrylate compound and a polyol. The oligomeric material includes a polyether urethane acrylate and a di-adduct compound, where the di-adduct compound is present in an amount of at least 2.35 wt%. The reaction mixture used to form the oligomeric material may include a molar ratio of isocyanate:hydroxy acrylate:polyol of n:m:p, where n may be greater than 3.0, m may be between n-1 and 2n-4, and p may be 2. Young's modulus and tear strength of coatings made from the compositions increase with increasing n. Coatings formed from the present oligomers feature high tear strength for a given Young's modulus.
Abstract:
The invention relates to radiation curable compositions comprising a liquid bis(acyl)phosphine photo initiators of formula (?): wherein each of Ar1, Ar2 and Ar3 is independently a substituted or unsubstituted aryl group. The invention also relates to stabilized forms of liquid bis(acyl)phosphines of formula (I) and radiation curable composition comprising said stabilized photoinitiators. The radiation curable compositions are selected from the group consisting of an optical fiber coating composition and a coating composition capable of radiation cure on concrete and a coating composition capable of radiation cure on metal.
Abstract:
An illumination system generating light having a light source at at least one wavelength within 200 nm and an optical fiber (12) with a plurality of nano-sized structures (32) (e.g., voids). The optical fiber coupled to the light source. The light diffusing optical fiber has a core (12) and a cladding (40). The plurality of nano-sized structures is situated either within said core or at a core- cladding boundary. The optical fiber also includes an outer surface (48). The optical fiber is configured to scatter guided light via the nano-sized structures away from the core and through the outer surface, to form a light- source fiber portion having a length that emits substantially uniform radiation over its length, said fiber having a scattering- induced attenuation greater than 50 dB/km for the wavelength (s) within 200 nm to 2000nm range.
Abstract:
Die Erfindung betrifft eine optische Festader (1), wie sie in der Lichtwellenleitertechnik zur Übertragung optischer Signale verwendet wird, aber auch zur Übertragung von Licht für Beleuchtungszwecke. Die optische Festader (1) weist eine Glasfaser (2) mit einem Mantel (3) auf. Der Mantel (3) weist folgende Zusammensetzung auf: eine Mischung aus PoIy Ether Ether Keton und einem anorganischen Füllstoff in einer Zumischung von wenigstens 10 und maximal 40 Gewichtsprozenten bei einer Korngröße von 0,08 μm bis 12 μm. Der Außendurchmesser des Mantels (3) beträgt 0,2 mm bis 1,2 mm. Das Verhältnis D/d zwischen dem Außendurchmesser D des Mantels (3) und dem Durchmesser d der Glasfaser (2) beträgt 2 bis 6. Ein Druck des Mantels (3) auf die Glasfaser (2) ist derart, dass im Wesentlichen keine Relativbewegung zwischen der Glasfaser (2) und dem Mantel (3) auftreten kann.
Abstract:
Disclosed are a water-resistant optical fiber yarn and an apparatus and a method for manu¬ facturing the same. The method includes steps of supplying an optical fiber yarn 100 having a predetermined diameter, forming a scratch surface 120 on a surface of the optical fiber yarn 100 through a sanding treatment or an etching process, coating the surface of the optical fiber yarn 100 having the scratch surface with a synthetic resin 200, curing a coated optical fiber yarn 100' by naturally drying the coated optical fiber yarn 100 ' or drying the coated optical fiber yarn 100' using a drier, and storing the coated optical fiber yarn 100' by winding the coated optical fiber yarn 100'. The apparatus includes a supplying unit 2, a surface treatment unit 4, a coating treatment unit 6, a drying unit 8, and a winding unit 10.