本文選題：超熒光光纖光源　切入點：摻鉺光子晶體光纖　出處：《深圳大學(xué)》2015年碩士論文

【摘要】：隨著空間科學(xué)與技術(shù)的發(fā)展,抗輻射高精度光纖陀螺用光源的應(yīng)用需求非常迫切。摻鉺超熒光光纖光源作為干涉型光纖陀螺用光源的理想候選者,具有廣闊的應(yīng)用前景。然而空間輻射環(huán)境會導(dǎo)致光源輸出特性發(fā)生明顯的衰退,體現(xiàn)在平均波長漂移和輸出功率衰減兩方面,這些將直接影響著光纖陀螺的精度和靈敏度。針對高精度光纖陀螺用光源在空間輻射環(huán)境的適應(yīng)性問題,論文開展了抗輻射高精度光纖陀螺用摻鉺光子晶體光纖光源的研究。論文主要研究內(nèi)容及成果如下:1)摻鉺光子晶體光纖光源輻射實驗研究。選取三種長度的摻鉺光子晶體光纖,設(shè)計三套雙程后向結(jié)構(gòu)光源,在相同泵浦功率下進行總劑量為500 Gy的γ輻射實驗及800 h的退火實驗。結(jié)果顯示,1530 nm波段信號光的輻致衰減比1560 nm波段小,1560 nm波段信號光的輻致?lián)p耗是導(dǎo)致光源平均波長往短波長漂移的主要因素。2)輻射環(huán)境下光源平均波長穩(wěn)定技術(shù)研究。針對光源輸出光譜平均波長往短波長漂移的問題,采用近高斯型光譜濾波整形技術(shù),對雙程前向和雙程后向結(jié)構(gòu)光源進行濾波整形,通過2.988 Gy/h及7.2 Gy/h兩個劑量率的輻射實驗。結(jié)果表明,近高斯濾波整形后,光源平均波長穩(wěn)定性提高了近25倍,在總劑量500 Gy輻射下,平均波長漂移小于40 ppm,證實了該方法對提高光源在輻射環(huán)境下的平均波長穩(wěn)定性具有顯著效果。3)輻射環(huán)境下光源輸出功率穩(wěn)定技術(shù)研究。通過反饋控制調(diào)節(jié)泵浦驅(qū)動電流,對光源輸出功率的輻致衰減進行補償。優(yōu)化硬件控制電路及軟件PID算法,同時分別獲得了光源在常溫和高低溫(-40℃~70℃)下輸出功率變化為0.253%和0.349%的高穩(wěn)定性;在總劑量500 Gy輻射下,光源功率變化小于1.5%,平均波長變化低于40 ppm;并且在超過1000 Gy的輻射總劑量下,光源功率變化僅2.31%,平均波長漂移僅47.637 ppm。本文結(jié)合光譜濾波整形技術(shù)與數(shù)字閉環(huán)光功率反饋控制技術(shù),顯著地提高了光源在空間環(huán)境下的適應(yīng)性,對促進高精度光纖陀螺在空間上的發(fā)展應(yīng)用具有重要意義。
[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 緯 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，

本文編號：1719702