Preparation method of erbium-bismuth co-doped special optical fiber with wide measurement temperature range and high concentration

• Main Authors: CHEN MING, CHENG YU, XIONG WEI, YU QICHUN, YUAN LIBO, ZHAO WANQI
• Format: Patent
• Language: Chinese; English
• Published: 01.11.2022
• Subjects: CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS; CHEMISTRY; GLASS; JOINING GLASS TO GLASS OR OTHER MATERIALS; MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES; METALLURGY; MINERAL OR SLAG WOOL; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS; SURFACE TREATMENT OF GLASS

The invention provides a preparation method of an erbium-bismuth co-doped special optical fiber with a wide measurement temperature range and high concentration, a chemical vapor deposition (MCVD) method and an NHS gas-phase high-temperature doping method are combined to manufacture an optical fiber preform, erbium and bismuth doping in a fiber core is realized by introducing an erbium-bismuth chelate, the doping concentration of Er is 6000-30000 ppm, and the doping concentration of Bi is 150-500 ppm. Under the action of the temperature of 260-300 DEG C, the erbium-bismuth chelate is uniformly deposited in a molecular form according to a certain proportion, and the preform is collapsed by adopting a low-temperature, small-negative-pressure or flat-pressing method, so that the production is more facilitated. The special optical fiber is characterized in that the temperature detection range is wide, high temperature and ultralow temperature can be measured, under the action of fixed pumping power, the character