Optical fiber for optical amplifier and process for manufacturing thereof
AssigneeLG Cable Ltd.
InventorsYoung-beom Seo, Jae-hong Lim, Dae-weon Kim
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Abstract
The present invention relates to an optical fiber for an optical amplifier and a method for manufacturing the same, which can be applied to an optical transmission system in the S-band area (4130 nm-1530 nm). According to the present invention, silica is used as a base material and the optical fiber for an optical amplifier contains Tm3+ ions and metal ions in a first core layer formed on an inner surface of a second core layer using the MCVD (Modified Chemical Vapor Deposition) method and a solution doping method whereby the practicability and productivity of the optical fiber are remarkably improved.
Claims10
An optical fiber for an optical amplifier having a substrate tube, a clad and a core, comprising:
- a first core layer doped with impurities comprising Tm3+ ions and metal ions;
- and
- a second core layer formed on the outer surface of the first core layer, without impurities doped;
- wherein the optical fiber contains silica, germanium and fluoride as a base material, which is used for the optical amplifier in the band of 1430 nm to 1530 nm.
A method for manufacturing an optical fiber for an optical amplifier, comprising the steps of:
- forming a clad layer and a second core layer in a silica substrate tube using the MCVD method to manufacture a preform of the optical fiber (S10);
- forming a first core layer on an inner surface of the second core layer, wherein the first core layer is partially sintered to provide a host for Tm3+ ions and metal ions (S20);
- uniformly doping the first core layer with a solution comprising Tm3+ ions and metal ions (S30);
- and
- making the perform collapse so as to obtain a bar-shaped perform and drawing the bar-shaped perform into an optical fiber having a predetermined diameter (S40).
Dependencies are inferred from the claim text.