| 摘要 |
A single mode optical transmission fiber comprises a depressed core having at least 0.41 weight percent fluorine and an index difference (|&Dgr;n1|) with pure silica greater than 1.5×10−3, a depressed cladding having at least 1.2 weight percent fluorine and an index difference (|&Dgr;n2|) with pure silica greater than 4.5×10−3 and an index difference (|&Dgr;n2|−|&Dgr;n1|) with the depressed core greater than or equal to 3×10−3.
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