| 摘要 |
<p> An optical waveguide including a core having silica, Al, a non-fluorescent rare-earth ion, Ge, Er, and Tm. The non-fluorescent rare-earth ion may be La. Exemplary compositions concentrations are Er is from 15 ppm to 3000 ppm, Al is from 0.5 mol% to 12 mol%, La is less than or equal to 2 mol%, Tm is from 15 ppm to 10,000 ppm; and the Ge is less than or equal to 15 mol%. The core may further include F. An exemplary concentration of F is less than or equal to 6 anion mol%.</p> |
