| 摘要 |
An optical signal amplifier comprising an optical waveguide fiber integrated by thallium ion exchange in a boron-free silicate glass doped with up to 5 weight %erbium oxide, the glass having a base composition, as calculated in weight percent on an oxide basis, consisting essentially of SiO2 38-67 Al2O3 1.5-4.5 Na2O 0-20 ZnO 1.5-8 K2O 0-25 Li2O 0-1 Na2O+K2O 15-30 PbO 0-37 BaO 0-7 P2O5 0-10 P2O5+PbO 5-37
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