Method for regulating and controlling gain intensity and bandwidth of erbium-doped silica fiber and fiber structure

• Main Authors: WANG TINGYUN, WEN JIANXIANG, DONG YANHUA, PAN XIANGPING, JI WEIZHU, ZHENG ZEXIN
• Format: Patent
• Language: Chinese; English
• Published: 30.08.2022
• Subjects: CHEMISTRY; GLASS; MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES; METALLURGY; MINERAL OR SLAG WOOL; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS

The invention discloses a method for regulating and controlling the gain intensity and bandwidth of an erbium-doped silica fiber and a fiber structure. The method comprises the following steps: firstly, sequentially depositing Al2O3, Bi2O3, Er2O3 and Al2O3 on a first loose layer on the inner wall of a quartz tube, then, depositing a SiO2 material doped with GeO2 and P2O5, carrying out semi-vitrification to form a second loose layer, sequentially depositing Al2O3, Bi2O3, Er2O3 and Al2O3 on the second loose layer, finally, depositing the SiO2 material doped with GeO2 and P2O5 as a core layer, carrying out high-temperature rod shrinkage, and drawing an optical fiber preform rod into the optical fiber by using a drawing tower. The deposition concentration of various doping materials is accurately controlled in the deposition process, so that the molar ratio of Al2O3 to Bi2O3 in the first layer is 0.5-20, the molar ratio of Bi2O3 to Er2O3 is 0.2-30, and the molar ratio of Er2O3 to Al2O3 in the last layer is 0.005-