GLASS COMPOSITION

摘要

A glass composition well suited for use in optical amplification consists of an erbium-doped borate glass composition comprising at least 30 mole percent of B2O3. This family of glasses provides a wide useful bandwidth (50 nm and greater) for optical amplification around the 1545 nm region. One preferred sub-family of glasses contains equal to or less than 30 mol. percent of SiO2 . Another preferred sub-family of glasses contains equal to or less than 5 mol .% of La2O3 and the ratio of B2O3 to (.SIGMA.X2O + .SIGMA.YO) is greater than o r equal to 3.5, more preferably 4.5, where X2O represents monovalent metal oxide(s) and YO represents divalent metal oxides.