Asahi Glass Company, Limited

Manuel Reyes

Seiki Ohara

Hideaki Hayashi

Naoki Sugimoto

Yasuji Fukasawa

Takeshi Hirose

Katsuhiro Ochiai

An optical amplifying glass comprising 100 parts by mass of a matrix glass and from 0.1 to 10 parts by mass of Er doped to the matrix glass, wherein the matrix glass comprises Bi O , at least one of B O and SiO , at least one member selected from the group consisting of Ga O , WO and TeO , and La O in such a ratio that Bi O is from 20 to 80 mol %, B O &plus;SiO is from 5 to 75 mol %, Ga O &plus;WO &plus;TeO is from 0.1 to 35 mol %, and La O is from 0.01 to 15 mol %.

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Yokohama, Japan

Manuel Reyes