Material Analysis And Performance Study Of Large-core Optical Fiber

Large-core energy fiber as a new generation of information and energy transmission medium, relatives to single mode fiber its mode of transmission for a variety of modes of communication, core size larger, optocoupler synthetic difficulty with single-mode fiber more easily, but the disadvantage is which transmission loss coefficient is larger and the production of preparation process is relatively difficult. Compared to the small-core single mode optical fiber, large-core energy fiber can transfer more energy, in the field of high energy transmission has important applications, especially in the field of laser transmission, which has attracted more and more attention of researchers. To promote the development of large-core energy fiber industry, as sub topics of the "863" project the main research contents of this paper included:Analysis of the prepared by two-step method of fluorine doped optical fiber preform component and effects of fluoride-doping on properties of large-core energy fiber and comparative analysis of five large-core energy fiber composition of energy as the starting point, this paper focuses on the analysis of the influence of the different components and optical fiber preform production processes and the corresponding optical fiber drawing process stick on the morphology and properties of the fiber. The results showed that different fluorine content affects large-core energy fiber transmission performance. Experimental results show that different optical fiber preform production technology of large-core energy fiber has a significant impact on the bare surface of the fiber and the section, and for(OVD + MCVD) two-step process for the production of energy produced by large-core energy fiber by adjusting the ratio of the reaction raw ingredients, evaporation pressure, the moving speed of the target rod and a correction coefficient of process parameters also affect the morphology and properties of the fiber compared to the cladding fluorine content of 0.52%, water molecules and the water peak can be significantly reduced in the fiber with the fluorine content of 1.25%.For large-core energy fiber in the special environment of application, especially in irradiation environment and high-low temperature environment, combined with the high-low temperature circulating device, focus on attention to the high-low temperature cycle of domestic large-core energy fiber transmission loss coefficient of the rule of influence, and by using instrumental analysis high-low temperature cycle of large-core energy fiber transmission energy dissipation mechanism are discussed. By testing the change of the optical fiber transmission rate in the temperature range of-100~100℃, the high-low temperature equipment is used to test the change of the optical fiber transmission rate in the temperature range of the temperature range. The Experimental results show that the transmission loss coefficient of the first window(850nm band) of the large-core optical fiber transmission loss coefficient along with the random fluctuation of temperature.The transmission loss coefficient in the whole temperature range is in the range of 2.543 d B/km to 4.237 d B/km. The results show that the paramagnetic defects(O-Si-O) are not found in the optical fiber core and the cladding layer by using the electron paramagnetic resonance spectrometer at the temperature range from-100℃ to 100℃. In this paper, the corresponding stress model is established to explain why the transmission loss coefficient fluctuates too much at the end of high-low temperature.In the experiment, the energy distribution of electrons in the optical fiber is simulated by CASINO software, and the radiation energy scheme of the large core diameter energy fiber is finally determined as 93 Ke V and 260 Ke V.