| 摘要 |
Raman amplifier comprising an optical fiber (2) which comprises a tellurite glass. The tellurite glass comprises at least two further metal oxides, the metals of said respective two oxides being selected from a first group consisting of Nb, W, Ti, Tl, Ta, and Mo and from a second group Nb, W, Ti, P b, Sb, In, Bi, Tl, Ta, Mo, Zr, Hf, Cd, Gd, La, Ba. The so obtained fiber (2) ha ve improved optical (Raman gain) and/or thermal (thermal stability index) properties. Alternatively, the tellurite based glass compositions of the fib er comprises at least one additional metal oxide, where the metal is selected among Nb, Ti, Tl, Ta, and Mo, said glass showing a particularly high Raman gain. The maximum Raman gain of these glasses is typically higher than 100 times of the maximum Raman gain of pure silica and the respective total cros s- section of the Raman spectrum is typically greater than 100 times than the total cross-section of pure silica, in the frequency measurement range of fr om 200 cm-1 to 1080 cm-1.
|
