Rare-earth-doped optical fiber with optimized background loss and preparation method of rare-earth-doped optical fiber

• Main Authors: WANG HENG, ZHONG LI, LEI GAOQING, CAO BEIBEI, YUAN BIAO, WANG SONG, ZHENG WEI
• Format: Patent
• Language: Chinese; English
• Published: 17.05.2022
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DEVICES USING STIMULATED EMISSION; DIFFUSION TREATMENT OF METALLIC MATERIAL; ELECTRICITY; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; METALLURGY; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION

The invention provides a back-to-bottom loss optimized rare earth doped optical fiber, which comprises a core layer, a transition cladding and a pure silicon cladding which are sequentially arranged from inside to outside, and is characterized in that the core layer and the transition cladding are both multi-element doped silicon dioxide layers; doped materials in the core layer comprise aluminum, ytterbium, phosphorus and one or more alkali metal elements; the doping concentration of the alkali metal element is calculated according to the oxide form of the alkali metal element, and the average concentration of the alkali metal oxide doped in the core layer is 50ppm-1000ppm; doped materials in the transition cladding comprise fluorine, phosphorus and one or more alkali metal elements; the doping concentration of the alkali metal element is calculated according to the oxide form of the alkali metal element, and the average concentration of the alkali metal element doped in the transition cladding is 500 ppm to