| 摘要 |
PURPOSE: An optical fiber is provided to improve the productivity of the product remarkably by using an optical fiber line, an inner tube, an outer tube, and an auxiliary stretching line. CONSTITUTION: An optical fiber comprises an optical fiber line(10), an inner tube(21), an outer tube(23), and an auxiliary stretching line(22). A first coating layer(13) is formed in the optical fiber line(10). The fist coating layer(13) is coated on the outer surface of an optical fiber spiral which is comprised of a core(11) and a clad layer(12). The optical fiber line(10) is inserted into the inner tube(21). The outer tube(23) is separated from the inner tube by a distance. The auxiliary stretching line(22) is disposed between the inner tube(21) and the outer tube(23).
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