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 ${\mathrm{GeO}}_2$ content from 3.6 mol% up to 98 mol%. Our results reveal a wide Brillouin frequency shift tunability over more than 3 GHz with a strong decrease down to 7.7 GHz at high ${\mathrm{GeO}}_2$ content owing to the low acoustic velocity, while the Brillouin linewidth significantly broadens up to 100 MHz beyond 50 mol% of ${\mathrm{GeO}}_2$ 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.

中文翻译：

---

掺锗的芯光纤中的布里渊大增益达到98 mol％的掺杂水平

锗硅酸盐玻璃是光纤技术中的重要材料，可以控制光学特性，例如数值孔径，光敏性，色散，非线性和对中红外的透明度。在这里，我们研究在单模锗硅酸盐芯纤维中受激布里渊散射随$O_{\mathrm{2个}}$含量从3.6mol％到98mol％。我们的结果表明，在超过3 GHz的频率范围内，布里渊（Brillouin）频移可调性范围很广，在高频率下可大幅降低至7.7 GHz$O_{\mathrm{2个}}$ 由于低的声速，Brillouin线宽显着扩大到100 MHz，超过了50 mol％ $O_{\mathrm{2个}}$内容。此外，通过泵浦-探针实验还报道了比标准硅石纤维大6.5倍的大布里渊增益。