Abstract
Germanosilicate glasses are substantial materials in fiber optic technology that have allowed the control of optical properties such as numerical aperture, photosensitivity, dispersion, nonlinearity, and transparency toward mid-infrared. Here, we investigate stimulated Brillouin scattering in single-mode germanosilicate core fibers with increasing GeO2 content from 3.6mol% up to 98mol%. Our results reveal a wide Brillouin frequency shift tunability over more than 3GHz with a strong decrease down to 7.7GHz at high GeO2 content owing to the low acoustic velocity, while the Brillouin linewidth significantly broadens up to 100MHz beyond 50mol% of GeO2 content. In addition, large Brillouin gain up to 6.5 times larger than in standard silica fibers is also reported by means of a pump-probe experiment.
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