| 摘要 |
PURPOSE:To assure high flexibility by inserting tension members having high tensile strength into a cable and forming plural protective layers around optical fibers. CONSTITUTION:The optical fiber is a quartz optical fiber and is formed with a clad 12 and further a protective layer 20 consisting of nylon, etc. around a core 11. An optical fiber cord 10 including up to such protective layer is formed. The direct protective layer 13 has a function as a tension member and increases the tensile strength of each optical fiber cord 10 to prevent the cutting, etc. of the optical fiber cord inn sich a case when bending stress is exerted over the entire part of the cable. One optical fiber cable including a sheath 14 is formed around the direct protective layer 13 and further an external sheath 19 is formed to the outermost circumferential part so that the entire part is formed as one compound cable.
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