Optical fiber curl cord and its manufacture
专利汇可以提供Optical fiber curl cord and its manufacture专利检索，专利查询，专利分析的服务。并且PURPOSE: To reduce variation in loss due to the extension and shrinkage of a curl cord almost to zero and to obtain the stable optical fiber curl cord by twisting an optical fiber previously so that variations in optical transmission loss due to variations in radii of torsion and curvature cancel each other.
CONSTITUTION: A core 4 is rotated as shown by an arrow and an optical fiber cord 2 is unwound from a payoff reel 5 and wound around it. In this case, the payoff reel 5 is rotated in the opposite direction of the winding direction to give torsion 6 to the optical fiber cord 2. When the optical fiber curl cord which has the torsion in the optical fiber in the curl cord is extended, the torsion given previously to the optical fiber is in the opposite direction of torsion accompanying the extension of the curl cord and its loss decreases. Consequently, variation in the loss due to the torsion decreases as compared with when the optical fiber is not given torsion previously and the loss is nearly equal in absolute value to and different in sign from the loss due to the bending, so they cancel each other and variation in the loss due to the extension and shrinkage of the curl cord is reduced almost to zero.
COPYRIGHT: (C)1986,JPO&Japio，下面是Optical fiber curl cord and its manufacture专利的具体信息内容。
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