BORATE OR ALUMINOSILICATE GLASS COMPOSITION FOR OPTICAL AMPLIFICATION

摘要

A glass composition suited for use in optical amplification includes a silicate which includes: at least 5o mole percent of SiO2, and at least one group III oxide, which may be selected from the group Al2O3 and B2O3, the ratio (R) of (X2O + YO) to said at least one group III ocide being less than or equal to 1.3, where X2O represents the sum of all alkali metal oxides present and YO represents the sum of all alkaline earth oxides and PbO and Z nO present. Fluorine may be included in the glass compositions. For composition s not including fluorine, it is preferred that the ratio R should be less than or equal to 1.0. The glass compositions are erbium-doped, and may be are co- doped with Yb2O3 and include dispersants such as Y2O3 and/or Gd2O3. This family of glasses possesses a flat gain characteristic in the 1545 nm region .