| 摘要 |
A bundle tube type optical cable is disclosed. A bundle tube type optical cable comprises: a bundle of optical fiber tubes being arranged in the middle portion of the optical cable and each containing at least two optical fiber cores loosely arranged therein; a first water-blocking layer protecting the optical fiber cores in the optical fiber tube from external moisture by a water-blocking material filled in the inner space of the tube; an inner shell made of aluminum material enclosing the bundle of optical fiber tubes with a predetermined gap; a second water-blocking layer protecting the optical fiber tubes from external moisture by the water-blocking material filled in the inner space of the inner shell; and an outer sheath made of plastic material enclosing the outer surface of the inner shell. In this way, since the outer sheath layer enclosing the optical fiber tubes is constructed in a double layer structure of an inner shell of aluminum material and an outer sheath of polyethylene, the optical cable can be bent easily, can prevent moisture penetration into the optical fibers and can prevent shrinkage at low temperature.
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