Patent ID: 7286739
Filing Date: 2007-10-23
Classification: C03B,C03C,G02B

Abstract:
1. A method for manufacturing a porous optical fiber comprising the steps of: (a) preparing a tubular mold including an external tube, an internal tube, and a central rod; (b) pouring a slurry containing amorphous silica particles into the external tube and gelling the slurry to produce an external cladding layer; (c) pouring a slurry containing a bubble forming material into a space between the external cladding layer and the central rod to form bubbles by means of a subsequent thermal treatment, and molding the slurry to produce an internal cladding layer; (d) removing the central rod from the mold, pouring a core material into the removed area of the central rod, and gelling the core material to produce a core; and (e) thermally treating a preform for the porous optical fiber, obtained by the steps (a) to (d), and drawing the porous optical fiber from the preform.