PRODUCTION OF COATED OPTICAL FIBER

• Main Authors: MAEDA KEIGO, OKAGAWA SHUJI
• Format: Patent
• Language: English
• Published: 24.06.1988
• Subjects: CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS; CHEMISTRY; GLASS; JOINING GLASS TO GLASS OR OTHER MATERIALS; METALLURGY; MINERAL OR SLAG WOOL; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS; SURFACE TREATMENT OF GLASS

PURPOSE:To obtain a coated optical fiber having plural coating layers and having excellent screening resistance and temperature characteristics, by using an ultraviolet-curable resin as a material for the inner coating layer, irradiating the resin with ultraviolet radiation in an atmosphere having a specific oxygen concentration and directly applying an outer coating layer to the cured resin layer. CONSTITUTION:In the production of a coated optical fiber having plural coating layers, the inner coating layer and the outer coating layer which are necessary to be mutually bonded are formed by the following method. An ultraviolet- curable resin is used as a material for the inner coating layer and the curing of the layer is carried out in an atmosphere having an oxygen concentration of >=5% to form the inner coating layer. The outer coating layer is directly formed on the inner coating layer. An ultraviolet-curable resin, a thermosetting resin or a thermoplastic resin may be used as a material for the outer coating layer and, above all, the use of an ultraviolet-curable resin is especially preferable to form a crosslinking between the inner and the outer layers and increase the bonding strength.