OPTICAL FIBER FOR LIGHT AMPLIFICATION

摘要

PROBLEM TO BE SOLVED: To provide an optical fiber for light amplification capable of suppressing amplification efficiency decline and nonlinearity by concentration quenching. SOLUTION: To the core of this optical fiber for the light amplification to which erbium ions are added, at least one of rare earth elements other than the erbium ion provided with at least the ion radius of >=70% and <=130% compared to the ion diameter of erbium, for instance Yb, is added.