| 摘要 |
An optical fiber having a core with a composition consisting essentially of 48 to 60 mole percent ZrF4, 15 to 25 mole percent BaF2, 1 to 5 mole percent LaF3, 1 to 5 mole percent AlF3, 15 to 22 mole percent NaF, and 1 to 8 mole percent ThF4; and a cladding having an index of refraction lower than that of the core. The glass of the core can be doped, for example, with rare earths. Built-in casting, rotational casting, casting around a rod, and rod-in-tube methods can be used to produce optical fibers having a composition in accordance with the present invention and having improved resistance to crystallization, as compared to ZBLAN glasses, even in the presence of rare earth dopants.
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