OPTICAL FIBER UNIT

PROBLEM TO BE SOLVED: To make it possible to suppress an increase in transmission loss by laminating plural optical fiber ribbons coated with buffer layers of a Young's modulus of a specific range and coating these fiber ribbons with foamed polyethylene(PE). SOLUTION: The optical fiber unit 1 i...

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Bibliographic Details
Main Authors HAYASHIZU YOSHITOSHI, HIGASHIDE YOSHIKI, FURUKAWA SHINICHI, KOSAKA MASATO, HOKARI KAZUO, ONUMA HIROAKI
Format Patent
LanguageEnglish
Published 06.05.1998
Edition6
Subjects
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
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Summary:PROBLEM TO BE SOLVED: To make it possible to suppress an increase in transmission loss by laminating plural optical fiber ribbons coated with buffer layers of a Young's modulus of a specific range and coating these fiber ribbons with foamed polyethylene(PE). SOLUTION: The optical fiber unit 1 is formed by laminating three pieces of the optical fiber ribbons 2 and coating these ribbons with the foamed PE 5. Each of the optical fiber ribbons 2 is formed by coating coated fiber ribbons 3 having four pieces of coated fibers 3a with the buffer layers 4 of 0.2mm thickness consisting of a nylon resin having the Young's modulus of 10 to 200kg/mm . The buffer layers 4 relieve the stresses acting thereon in consequence of the nonuniform shrinkage generated along a longitudinal direction at the time the foamed PE 5 coating the fiber ribbons cools at the time of producing the optical fiber unit 1. The Young's modulus of the buffer layers 4 is more preferably 30 to 140kg/mm , most preferably 50 to 90kg/mm . The foamed PE 5 is low-density polyethylene having an expansion times of 40 to 60% and imparts the strength to side pressures to the optical fiber unit 1.
Bibliography:Application Number: JP19960269910