掺铒光子晶体光纤光源空间环境适应性研究

发布时间：2018-04-07 15:08

  本文选题：超荧光光纤光源　切入点：掺铒光子晶体光纤　出处：《深圳大学》2015年硕士论文

【摘要】：随着空间科学与技术的发展,抗辐射高精度光纤陀螺用光源的应用需求非常迫切。掺铒超荧光光纤光源作为干涉型光纤陀螺用光源的理想候选者,具有广阔的应用前景。然而空间辐射环境会导致光源输出特性发生明显的衰退,体现在平均波长漂移和输出功率衰减两方面,这些将直接影响着光纤陀螺的精度和灵敏度。针对高精度光纤陀螺用光源在空间辐射环境的适应性问题,论文开展了抗辐射高精度光纤陀螺用掺铒光子晶体光纤光源的研究。论文主要研究内容及成果如下:1)掺铒光子晶体光纤光源辐射实验研究。选取三种长度的掺铒光子晶体光纤,设计三套双程后向结构光源,在相同泵浦功率下进行总剂量为500 Gy的γ辐射实验及800 h的退火实验。结果显示,1530 nm波段信号光的辐致衰减比1560 nm波段小,1560 nm波段信号光的辐致损耗是导致光源平均波长往短波长漂移的主要因素。2)辐射环境下光源平均波长稳定技术研究。针对光源输出光谱平均波长往短波长漂移的问题,采用近高斯型光谱滤波整形技术,对双程前向和双程后向结构光源进行滤波整形,通过2.988 Gy/h及7.2 Gy/h两个剂量率的辐射实验。结果表明,近高斯滤波整形后,光源平均波长稳定性提高了近25倍,在总剂量500 Gy辐射下,平均波长漂移小于40 ppm,证实了该方法对提高光源在辐射环境下的平均波长稳定性具有显著效果。3)辐射环境下光源输出功率稳定技术研究。通过反馈控制调节泵浦驱动电流,对光源输出功率的辐致衰减进行补偿。优化硬件控制电路及软件PID算法,同时分别获得了光源在常温和高低温(-40℃~70℃)下输出功率变化为0.253%和0.349%的高稳定性;在总剂量500 Gy辐射下,光源功率变化小于1.5%,平均波长变化低于40 ppm;并且在超过1000 Gy的辐射总剂量下,光源功率变化仅2.31%,平均波长漂移仅47.637 ppm。本文结合光谱滤波整形技术与数字闭环光功率反馈控制技术,显著地提高了光源在空间环境下的适应性,对促进高精度光纤陀螺在空间上的发展应用具有重要意义。
[Abstract]:With the development of space science and technology, the application of radiation resistant high precision fiber optic gyroscope light source is very urgent.Erbium doped superfluorescent fiber source is an ideal candidate for interferometric fiber optic gyroscope.However, the radiation environment in space will lead to the obvious degradation of the output characteristics of the light source, which is reflected in the average wavelength drift and output power attenuation, which will directly affect the precision and sensitivity of the fiber optic gyroscope (fog).Aiming at the adaptability of high precision fiber optic gyro light source in space radiation environment, the erbium-doped photonic crystal fiber light source for high precision anti-radiation fiber gyroscope is studied in this paper.The main contents and results are as follows: 1) Erbium-doped photonic crystal fiber source radiation experimental study.Three kinds of Erbium-doped photonic crystal fibers were selected and three sets of double-pass backward structure light sources were designed. The total dose of 500 Gy 纬 radiation and the 800 h annealing experiment were carried out under the same pump power.The results show that the radiation-induced attenuation of the 1530nm signal light is smaller than that of the 1560 nm band. The radiation-induced loss of the 1560nm signal light is the main factor leading to the shift from the average wavelength of the light source to the short wavelength. 2) the study on the stability of the average wavelength of the light source in the radiation environment.In order to solve the problem that the average wavelength of output spectrum shifts to the short wavelength of the light source, the near Gao Si type spectral filtering shaping technique is used to filter and shape the double-pass forward and two-way backward structure light sources. The radiation experiments at the dose rates of 2.988 Gy/h and 7.2 Gy/h are carried out.The results show that the average wavelength stability of the light source has been improved by nearly 25 times after the near Gao Si filter shaping. At the total dose of 500 Gy radiation,The average wavelength shift is less than 40 ppm, which proves that this method has a significant effect on improving the average wavelength stability of the light source in the radiation environment. 3) the study on the stability of the output power of the light source in the radiation environment.The radiation attenuation of the output power of the light source is compensated by adjusting the pump driving current by feedback control.The hardware control circuit and the software PID algorithm are optimized. At the same time, the high stability of the output power of the light source at room temperature and low temperature (-40 鈩，

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