We demonstrate the broadband optical amplification in bismuth-doped strontium germanate glass with $808\mathrm{nm}$ and $980\mathrm{nm}$ laser diodes (LDs) as excitation sources. The net optical gain has been obtained within the wavelength region of 1272 to $1348\mathrm{nm}$ with $808\mathrm{nm}$ laser diode under $0.97\mathrm{W}$ power. The maximum gain and gain coefficients are 1.23 and $1.03{\mathrm{cm}}^{-1}$ at $1315\mathrm{nm}$ , respectively. The signal increment at $1300\mathrm{nm}$ is 2.8 times with $980\mathrm{nm}$ LD, under $3\mathrm{W}$ power. The differential thermal analysis measurement reveals the good thermal stability of the studied glass. This glass could be suggested as a promising gain medium for broadband optical amplifiers.

© 2007 Optical Society of America

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