Patent ID: 6836605
Filing Date: 2004-12-28
Classification: C03B,C03C,G02B

Abstract:
A method for producing an optical fiber preform, the method comprising:(a) a preparing step in which a glass pipe, a glass rod, and a heat source are prepared; (b) a diameter-reduced-portion-forming step in which an inner diameter of the glass pipe is reduced at two longitudinal locations for forming a first diameter-reduced portion and a second diameter-reduced portion; (c) a glass-rod-inserting step in which the glass rod is inserted into the glass pipe; (d) a glass-rod-fixing step in which the glass rod is fixed to the glass pipe at the first diameter-reduced portion; and (e) a unifying step in which the glass pipe and the glass rod is heat-unified from the second diameter-reduced portion to the first diameter-reduced portion.