本文選題：光纖Bragg光柵 + 色散　； 參考：《蘭州理工大學(xué)》2017年碩士論文

【摘要】：本文提出了一種包層為電光晶體材料LiTaO3的新型光纖Bragg光柵,結(jié)合電光效應(yīng)、耦合模理論和同時測量原理等理論,分析了纖芯半徑和外加電場對光柵特性的影響并應(yīng)用該類型光柵設(shè)計(jì)了一種新型傳感器。主要研究內(nèi)容如下:1、研究了芯徑半徑大小和電場強(qiáng)度對基模能量分布、布拉格波長?B、反射率?、群時延?、二階色散D和三階色散?3的影響。研究結(jié)果表明:(1)半徑恒定條件下,隨著電場強(qiáng)度的不斷增加,基模能量最大值也增加,有效模場面積和光柵布拉格波長不斷減小,反射譜、群時延和二階色散曲線都向短波長方向移動,期間伴隨著反射譜寬度、最大值和最小值的改變,并且布拉格波長處的時延最大,二階色散最小。(2)入射波長恒定條件下,當(dāng)半徑增加時,反射譜、群時延和二階色散曲線移向高電場,當(dāng)電場強(qiáng)度增加時,與反射譜、群時延和二階色散曲線對應(yīng)的半徑也增大。(3)電場一定時,隨著半徑a的逐漸增大時延最大值向長波長移動,即發(fā)生紅移,并且半徑對時延的影響程度與電場強(qiáng)度的大小有關(guān)。(4)當(dāng)波長?=1550nm,半徑為900nm,電場強(qiáng)度為53×107 v/m時,三階色散?3取得最大值。?3從最小值到最大值的過程中,電場強(qiáng)度改變了1×106v/m,而半徑只改變了0.1nm,該結(jié)果說明三階色散對電場不是很敏感,但是其對半徑極為敏感。2、設(shè)計(jì)了一種包層為單軸電光晶體LiTaO3的新型光纖Bragg光柵傳感器。單個光纖Bragg光柵的一半包層被施加電場,另一半保持不變,應(yīng)用耦合模理論、電光效應(yīng)原理和雙波長法研究了有外加電場時的傳感性能。研究結(jié)果表明沒有電場的一半光柵的溫度靈敏度為14.31 pm/℃,與之對應(yīng)的布拉格波長漂移只與溫度或者應(yīng)變有關(guān);所加電場強(qiáng)度在0-400×107v/m之間時,有電場的一半光柵的溫度靈敏度變化范圍為14.12-14.31 pm/℃,與之對應(yīng)的布拉格波長漂移不僅與溫度或者應(yīng)變有關(guān),還受到電場強(qiáng)度的影響。因此,應(yīng)用該傳感器可分辨出溫度、電場強(qiáng)度所引起的布拉格波長漂移,從而實(shí)現(xiàn)了溫度-電場的同時測量。該成果在高電壓領(lǐng)域具有潛在的應(yīng)用價值。
[Abstract]:In this paper, a new type of fiber Bragg grating with a coating of electrooptic crystal material LiTaO3 is proposed. Combining the electro-optic effect, the coupled mode theory and the simultaneous measurement principle, the influence of the core radius and the applied electric field on the characteristics of the grating is analyzed and a new type of sensor is designed with this type of grating. The main contents are as follows: 1, the study is made. The radius of the core diameter and the intensity of the electric field are affected by the energy distribution of the base mode, Prague wavelength? B, reflectivity, group delay?, the two order dispersion D and the three order dispersion? 3. The results show: (1) under constant radius, the maximum value of the base mode energy increases with the constant increase of the electric field intensity, and the effective mode field area and the grating wavelength of the grating decrease continuously. The reflection spectrum, the group delay and the two order dispersion curve are all moving in the short wavelength direction, with the change of the width of the reflection spectrum, the maximum and the minimum, and the maximum time delay at the Prague wavelength and the least two order dispersion. (2) when the incident wavelength is constant, the reflection spectrum, the group delay and the two order dispersion curve move to the high electric field when the radius is constant. When the intensity of the electric field is increased, the radius corresponding to the reflection spectrum, group delay and the two order dispersion curve also increases. (3) when the electric field is fixed, the maximum time delay of the radius a moves to the long wavelength, that is, the red shift occurs, and the influence of the radius on the time delay is related to the intensity of the electric field. (4) when the wavelength is =1550nm, the radius is 900nm, the electric field is strong. When the degree is 53 x 107 v/m, the three order dispersion 3 obtains the maximum value.? 3 from the minimum to the maximum value, the electric field intensity changes 1 x, and the radius only changes 0.1nm. The result shows that the three order dispersion is not very sensitive to the electric field, but it is very sensitive to the radius of the radius, and a new type of fiber Bra with the uniaxial electro-optic crystal LiTaO3 is designed. GG grating sensor. The half cladding of a single fiber Bragg grating is applied electric field and the other half remains unchanged. Using the coupled mode theory, the electro-optic effect principle and the double wavelength method, the sensing performance of the applied electric field is studied. The results show that the temperature sensitivity of the half grating without electric field is 14.31 pm/ C, and the corresponding Prague wave The long drift is only related to temperature or strain; when the intensity of the electric field is 0-400 * 107v/m, the temperature sensitivity of the half grating with an electric field is 14.12-14.31 pm/ C. The corresponding Prague wavelength shift is not only related to the temperature or strain, but also influenced by the electric field intensity. Therefore, the sensor can be resolved by using the sensor. The temperature and electric field intensity caused by the Prague wavelength drift, thus achieving the simultaneous measurement of the temperature electric field. The results have potential application value in the field of high voltage.

【學(xué)位授予單位】：蘭州理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN253;TP212

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