Rare earth element-doped multiple-core optical fiber and method

Details Rare earth element-doped multiple-core optical fiber and method Rare earth element-doped multiple-core optical fiber and method

1996-06-04

1998-01-27

Palmer, Phan T. H.

Optical waveguides

Optical fiber waveguide with cladding

Utilizing multiple core or cladding

385141, 385123, G02B 602

Patent

active

057129410

ABSTRACT:
A rare earth element-doped multiple-core optical fiber has an outer cladding layer and a plurality of cores each covered with a primary cladding layer. The cores are positioned substantially on a central axis of the outer cladding layer and separated with a predetermined spacing S from each other by the primary cladding layer. The outer cladding layers are made of SiO.sub.2, or SiO.sub.2 added with a dopant like F, Ge, etc. The primary cladding layer is made of SiO.sub.2 doped with Er, or SiO.sub.2 doped with Er and F together and formed to have a predetermined thickness of 1.0 .mu.m.about.1.5 .mu.m to form the predetermined spacing S. The Soot glass rods for cores and primary cladding layers are immersed in an Er-compound solution, then picked up, dried and consolidated to form Er--Al co-doped SiO.sub.2 --GeO.sub.2 transparent glass rods. The glass rods are inserted into a quartz tube and collapsed by heat to fabricate an optical fiber preform rod, then heated to be drawn to provide an Er-doped multiple-core optical fiber.

REFERENCES:
patent: 5570448 (1996-10-01), Imoto et al.
English Language Abstract of Japanese Laid-Open Application No. 5-299733, publication date unknown. Patent date Nov. 1993.
English Language Abstract of Japanese Laid-Open Application No. 5-345632, publication date unknown. Patent date Dec. 1993.
English Language Abstract of Japanese Laid-Open Application No. 6-37385, publication date unknown. Patent date Feb. 1994.

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