Being the manner which produces the production mannered null optical fiber preform

摘要

PROBLEM TO BE SOLVED: To provide a method of producing an optical fiber capable of adjusting core diameter profile for a specific fiber design in addition to providing a substantially uniform core diameter.;SOLUTION: The method of producing an optical fiber comprises traversing of a heating means along the lengthwise direction of a silica based core rod to heat an area to be softened, and compressive or extensional movement is applied to the rod along the lengthwise direction of the rod during the traversing of the heating means which results in an increase or a decrease of the core diameter in the softened area. The desired core diameter profiles are achieved by providing a selective increase and/or decrease of core diameter over whole length of the core rod, such as a substantially uniform core diameter or a varying core diameter profile providing a specified characteristic such as regularly varying dispersion. Furthermore, larger size core rod can be produced through a controlled increase of core diameter including a fiber preform larger than the currently possible size.;COPYRIGHT: (C)2002,JPO