Borate or aluminosilicate glass composition for optical...

C - Chemistry – Metallurgy – 03 – C

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C03C 3/095 (2006.01) C03C 4/00 (2006.01)

Patent

CA 2380051

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 ZnO present. Fluorine may be included in the glass compositions. For compositions not including fluorine, it is preferred that the ratio R should be less than or equal to 1Ø 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.

L'invention concerne une composition de verre qui se prête bien à l'amplification optique. Cette composition comprend un silicate contenant 50 pour-cent molaires de SiO¿2?, et au moins un oxyde du groupe III qui peut être sélectionné dans le groupe Al¿2?O¿3? et B¿2?O¿3?, le rapport (R) entre (X¿2?O + YO) et cet/ces oxyde(s) du groupe III étant inférieur ou égal à 1,3; X¿2?O représente le total de tous les oxydes métalliques alcalins présents et YO représente le total de tous les oxydes alcalino-terreux et PbO et ZnO présents. On peut inclure du fluor dans ces compositions de verre. Dans les compositions exemptes de fluor il est préférable que le rapport R soit inférieur ou égal à 1,0. Ces compositions de verre sont dopées à l'erbium, et de préférence co-dopées avec Yb¿2?O¿3? et comprennent des agents dispersants tels que Y¿2?O¿3? et/ou Gd¿2?O¿3?. Cette famille de verres possède une caractéristique de gain plat dans la région 1545 nm.

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