A radiation-insensitive single-mode fiber

Abstract

The invention discloses a radiation-insensitive single-mode optical fiber, which relates to the field of radiation-resistant optical fibers. The optical fiber includes, from inside to outside, a core, a transition clad, a depressed clad, and an outer clad; wherein, the core and all The transition cladding layers all contain quartz material doped with fluorine element; the sunken cladding layer and the outer cladding both contain quartz material co-doped with fluorine element and radiation-resistant metal ions. The radiation-insensitive single-mode fiber provided by the invention not only has low intrinsic loss, but also has good radiation tolerance to steady-state gamma radiation with a total dose of 2MGy. In addition, the radiation-insensitive single-mode optical fiber provided by the present invention has strong stability to a dry heat aging environment at a temperature of 85°C or a humid heat aging environment at a humidity of 85% and a temperature of 85°C, and can overcome the thermal aging environment of traditional optical fibers. The disadvantage of radiation-induced loss is easy to occur in the nuclear radiation environment.

Description

technical field [0001] The invention belongs to the field of optical fiber manufacturing, in particular to a radiation-insensitive single-mode optical fiber. Background technique [0002] Optical fiber communication has good anti-electromagnetic interference ability, high transmission bandwidth and easy large-scale integration. For emerging fields such as nuclear power, deep space exploration, and underground exploration, traditional cables can no longer carry higher data traffic, and optical fibers need to be used instead of traditional transmission media for signal transmission. However, there are also severe environmental factors such as high temperature, high humidity and high radiation in the above environment, which have a great impact on the quartz material constituting the optical fiber, causing the optical fiber to cause additional absorption in multiple bands, resulting in radiation-induced attenuation (Radiation Induced Attenuation). ). The main cause of radiati...

AI Technical Summary

Problems solved by technology

These defects are easy to capture free electrons and holes generated by radiation, forming new absorption peaks, resulting in increased fiber attenuation

[0003] Due to the introduction of germanium in traditional optical fibers, the disorder of the quartz network structure will increase. In addition to increasing the Rayleigh scattering of optical signals, it will also produce a variety of material defects related to germanium, which is not conducive to the improvement of optical fiber radiation sensitivity. reduce

On the other hand, the high-temperature, high-humidity and radiation environment of the thermonuclear reaction will also cause the free electrons, holes or free hydrogen elements in the optical fiber coating and the outer quartz material to diffuse to the inner light-guiding area, which not only increases the original defect The generation probability of the absorption peak will continue to form new types of material defects on this basis, which has a great impact on the radiation-induced attenuation of the optical fiber

[0004] In view of the germanium doping method of traditional optical fibers and the various material defects of the quartz materials used in them, they produce large radiation-induced attenuation under harsh environmental conditions such as high temperature, high humidity and high radiation, which cannot meet practical applications. demand, therefore, the current problem is that there is an urgent need to research and develop a radiation insensitive single-mode fiber

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