Method for producing glass preform for optical fiber
AssigneeSumitomo Electric Industries, Ltd.
InventorsMasumi Ito, Sumio Hoshino, Shinji Ishikawa
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Abstract
A glass preform for an optical fiber containing a dopant in a core portion at a high concentration is produced by providing a glass tube, forming a coating film of a sol-gel solution containing a dopant compound on an inner wall of the glass tube, vitrifying and collapsing the glass tube having the coating of the sol-gel solution to obtain a glass rod.
Claims14
A method for producing a glass preform for use in the fabrication of an optical fiber which comprises steps of:
- providing a glass tube which forms a core part of the preform,
- forming a coating film of a sol-gel solution comprising SiO.sub.2 and a dopant compound on an inner wall of said glass tube,
- vitrifying and collapsing said glass tube having the coating of the sol-gel solution to obtain a glass rod as a core part of the preform, and
- providing a cladding part around the periphery of said glass rod
- wherein a diameter of said core part prepared from said sol-gel solution is 3 to 30% of the entire diameter of said core part.
A method for producing a glass preform for use in the fabrication of an optical fiber which comprises steps of:
- providing a glass tube consisting of an inner wall which forms a core part and an outer wall which forms a cladding part,
- forming a coating film of a sol-gel solution comprising SiO.sub.2 and a dopant compound on an inner wall of said glass tube, and
- vitrifying and collapsing said glass tube having the coating of the sol-gel solution while flowing a mixture of chlorine and oxygen through the glass tube to obtain a glass preform wherein a diameter of said core part prepared from said sol-gel solution is 3 to 30% of the entire diameter of said core part.
A method for producing a glass preform for use in the fabrication of an optical fiber which comprises steps of:
- providing a glass tube which forms a cladding part of the preform,
- forming a coating film of a sol-gel solution comprising SiO.sub.2 and a dopant compound on an inner wall of said glass tube,
- vitrifying and collapsing said glass tube having the coating of the sol-gel solution while flowing a mixture of chlorine and oxygen through the glass tube to obtain a glass preform said sol-gel solution forming a core part of the preform wherein a diameter of said core part prepared from said sol-gel is 3 to 30% of the entire diameter of said core part.
Dependencies are inferred from the claim text.