METHOD FOR PRODUCING QUARTZ GLASS PIPE, METHOD FOR PRODUCING OPTICAL FIBER PREFORM AND OPTICAL FIBER

摘要

PROBLEM TO BE SOLVED: To provide a method for producing a quartz glass pipe and a method for producing an optical fiber preform to produce a quartz glass pipe having a small difference in the ratio of outside diameter to inside diameter, to produce an optical fiber preform using this quartz glass pipe and to produce an optical fiber having a small variation in zero dispersion wavelength in the lengthwise direction using this optical fiber preform and to provide an optical fiber.

SOLUTION: The quartz glass pipe having a small variation in the ratio of outside diameter to inside diameter is produced by grinding the periphery of a quartz glass pipe according to its inside diameter change. A quartz glass pipe is drawn in such a way as to obtain a uniform outside diameter to produce the objective quartz glass pipe. The optical fiber preform is produced by inserting a glass rod including a core into the produced quartz glass pipe and carrying out rod-in collapse. This optical fiber preform is converted to an optical fiber to produce the objective optical fiber having≤0.5%/10 km variation in zero dispersion wavelength in the lengthwise direction.

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