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Bismuth (Bi) -doped silicate glass for future photonics applications was proposed by Y. Fujimoto et al . in 2001 [1]. And its broadband fluorescence characteristic at 1.3um band was demonstrated for the first time. From this report, several studies such as clarifying the fluorescence mechanism, surveying the optical properties of Bi-doped glass with various host glass materials and so on have been done. However, there was no report on fabricating Bi-doped silicate glass fiber (BiDF) for the demonstration of optical amplification and laser oscillation. In 2005, Haruna et al . succeeded in fabricating the BiDF by Modified Chemical Vapor Deposition (MCVD) method for the first time, and evaluated its absorption and fluorescent characteristics [2]. In this report, the absorption bands around 0.5 um, 0.7 um, 0.8 um and 1.0um were shown, and the very wide fluorescence band with a FWHM of 192 nm centered at 1.06um was also indicated. The background loss of the fiber was as low as |
