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  • 1
    Electronic Resource
    Electronic Resource
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 29 (1989), S. 1182-1185 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: It is important to prevent transmission loss increase of optical fiber cables during a fire and fire fighting. One of the main reasons for the loss increase in a fire is the expansion and shrinkage of polymers used in optical fiber cables. The authors have developed a fire resistant optical fiber cable by studying the behavior of coating materials and coated fibers at high temperature. Polymer types investigated are thermoplastics, engineering plastics, and UV cured plastics. The fire resistant optical fibers are coated with a polymer which rapidly produces a carbonized layer by exposure to heat. The rapid carbonizing has the effect of reducing expansion and shrinkage. Besides the coating, the coated fiber is surrounded by carbon yarn to prevent breakage of the fiber. The fire resistant optical fiber cable passed the fire test at 840°C for 30 minutes and VTFT specified IEEE 383, without any breakage of the fibers. The optical loss of the fibers scarcely changed during the tests and after the tests. This paper presents the studies of coating materials and coated fibers at high temperature, the structure and properties of the coated fiber and characteristics of the fire resistant optical fiber cable.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 29 (1989), S. 1193-1196 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Two types of precisely molded fiber optic connectors have been developed. They are a cylindrical ferrule connector for a single fiber and a five-fiber array connector for a tape fiber. The connectors are made by using a transfer molding technique with a silica-filled thermosetting epoxy resin. The resin has low pressure and high melt-flow characteristics, high dimensional accuracy, and high stability. The single fiber connector consists of a pair of plastic molded ferrules, a slitted alignment sleeve, and a plate spring. A fiber is inserted into a ferrule capillary and is fixed with adhesive. Then the fiber end face positioned in the center of the ferrule is polished to have a mirror surface. The five-fiber connector consists of a couple of precisely molded ferrules, two alignment pins, and a plate spring. The five-fiber ribbon is inserted into fiber receiving capillaries, of the ferrule, and fixed with adhesive. The fiber end faces on the ferrule mating face are polished to have a mirror face. In order to realize a low-loss connection, the alignment pin holes and five-fiber positioning capillaries on the ferrule mating face must be molded precisely. Various kinds of reliability tests on the connectors were conducted. All the results obtained proved that the connectors have entirely satisfactory properties for practical use. The connectors are now widely used in an optical fiber subscriber network.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
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