OPTICAL TRANSMISSION FIBER GLASS AND OPTICAL TRANSMISSION FIBER

To provide an optical transmission fiber glass, free of PbO, suitable for a core of an optical transmission fiber, having excellent optical transmittivity, chemical durability, and thermal stability, while having a high refractive index and low degree of coloration.SOLUTION: Provided is an optical transmission fiber glass characterized in that the fiber glass substantially does not contain Pb, As, or Ti; has a refractive index nd in the range from 1.60 to 1.70; and contains as glass components at least SiO2, B2O3, BaO, La2O3, ZrO2, and ZnO, wherein, expressed in mass%, the total content of the SiO2 and B2O3 is 25% to 50%, the content of BaO is 10% to 50%, and the content of La2O3 is 6% to 30%.SELECTED DRAWING: None 【課題】本発明は高い屈折率、低い着色度でありながら、光伝導性、化学的耐久性、熱的安定性に優れる光伝導ファイバーのコアに適したＰｂＯを含まない光伝導ファイバー用ガラスを提供することを目的とする。【解決手段】Ｐｂ、Ａｓ及びＴｉを実質的に含まず、屈折率ｎｄが１．６０〜１．７０の範囲にあり、ガラス成分として、少なくともＳｉＯ２、Ｂ２Ｏ３、ＢａＯ、Ｌａ２Ｏ３、ＺｒＯ２、及びＺｎＯを含み、質量％で、ＳｉＯ２およびＢ２Ｏ３の合計含有量が２５〜５０％、ＢａＯの含有量が１０〜５０％、Ｌａ２Ｏ３の含有量が６〜３０％、であることを特徴とする光伝導ファイバー用ガラス。【選択図】なし