Broadband optical amplification in Bi-doped germanium silicate glass

Bi-doped germanium silicate glass is prepared and their optical properties are investigated. The glass sample shows broadband and flat emission characteristics compared with germanate glass. The single-pass optical amplification was measured on a traditional two-wave mixing configuration. Ultrabroadband optical amplification at 1272 and 1560 nm is observed simultaneously. The highest gain at 1272 nm of germanium silicate glass reaches to 6.73 dB excited with single commercially available 980 nm laser diode. The glass is promising for optical amplification covering almost all the O , E , S , C , and L bands.