發(fā)布時(shí)間：2018-01-20 01:57

  本文關(guān)鍵詞： 動(dòng)態(tài)光柵 光纖Bragg光柵 F-P腔 傳輸矩陣 反射譜　出處：《吉林大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：人們對(duì)于光纖Bragg光柵和動(dòng)態(tài)光纖光柵的研究已經(jīng)非常成熟。光纖Bragg光柵的體積小,質(zhì)量輕,柔韌度高,耐高溫、抗電磁干擾以及化學(xué)性能穩(wěn)定都很強(qiáng),因此在應(yīng)用中有很大的優(yōu)勢(shì)。另一方面,由于動(dòng)態(tài)光柵在光纖傳感器、自適應(yīng)干涉儀以及光學(xué)存儲(chǔ)元件等方面有重要應(yīng)用,因此在摻鉺光纖中寫入的動(dòng)態(tài)光柵引起了人們的關(guān)注。動(dòng)態(tài)光柵有一些特有的優(yōu)點(diǎn),例如光柵的中心波長(zhǎng)、光柵強(qiáng)度以及線寬等參量動(dòng)態(tài)可調(diào)。本論文利用光纖Bragg光柵和動(dòng)態(tài)光纖光柵的固有優(yōu)勢(shì),設(shè)計(jì)基于摻鉺光纖動(dòng)態(tài)光柵與光纖Bragg光柵的F-P腔,并研究了它的特性。首先研究了在摻鉺光纖中形成的動(dòng)態(tài)光柵,對(duì)其透射率和反射率進(jìn)行計(jì)算。接下來(lái)研究其與光纖Bragg光柵形成的F-P腔的特性。這種F-P腔的一個(gè)重要性質(zhì)是可以動(dòng)態(tài)調(diào)制腔的透射和反射特性。相比于兩個(gè)光纖Bragg光柵制成的F-P腔,可調(diào)的系統(tǒng)相比于固定的系統(tǒng)更加靈活。而兩個(gè)光纖Bragg光柵制成的F-P腔,由于腔長(zhǎng)固定,F-P腔的共振響應(yīng)不能動(dòng)態(tài)可調(diào)。我們提出的一個(gè)可調(diào)的動(dòng)態(tài)光柵和光纖Bragg光柵形成的F-P腔,它的透過(guò)和反射特性可以通過(guò)調(diào)節(jié)相干場(chǎng)的拉比頻率等參數(shù)進(jìn)行動(dòng)態(tài)調(diào)制。另外,在F-P腔兩端,兩個(gè)紫外寫入的光柵由于制作流程的限制,通常兩個(gè)光柵很難完全對(duì)稱,如不對(duì)稱的光柵周期、折射率調(diào)制深度等。這種不對(duì)稱性會(huì)降低F-P腔的優(yōu)勢(shì)特性。用動(dòng)態(tài)光柵和光纖Bragg光柵形成的F-P腔,只要通過(guò)改變波長(zhǎng)、耦合場(chǎng)的拉比頻率等,就可以克服這種不對(duì)稱的缺陷。本論文的研究成果如下:1.針對(duì)具體的二能級(jí)摻鉺光纖動(dòng)態(tài)光柵模型,根據(jù)半經(jīng)典相互作用理論以及耦合模理論,算出二能級(jí)摻鉺光纖動(dòng)態(tài)光柵的透過(guò)率和反射率。實(shí)驗(yàn)驗(yàn)證二能級(jí)摻鉺光纖動(dòng)態(tài)光柵的存在,并根據(jù)計(jì)算出的結(jié)果進(jìn)行數(shù)值分析,畫出在不同參數(shù)下的二能級(jí)摻鉺光纖動(dòng)態(tài)光柵反射譜。2.應(yīng)用傳輸矩陣?yán)碚?算出摻鉺光纖動(dòng)態(tài)光柵與光纖Bragg光柵形成的F-P腔的透過(guò)率與反射率。對(duì)于動(dòng)態(tài)F-P腔的三個(gè)部分分別進(jìn)行參數(shù)的調(diào)制,并進(jìn)行數(shù)值分析。改變的參數(shù)分別為:動(dòng)態(tài)光纖中相干場(chǎng)的拉比頻率,光纖Bragg光柵的折射率調(diào)制深度以及F-P腔的腔長(zhǎng),畫出多種情況下的反射譜,分析以上參數(shù)改變對(duì)于動(dòng)態(tài)F-P腔光學(xué)性質(zhì)的影響。本論文對(duì)動(dòng)態(tài)光柵與光纖Bragg光柵形成F-P腔的特性進(jìn)行了研究,對(duì)于后續(xù)的實(shí)驗(yàn)與實(shí)際應(yīng)用提供了一些參考。
[Abstract]:The research of fiber Bragg grating and dynamic fiber grating is very mature. Fiber Bragg grating is small in volume, light in weight, high in flexibility and high temperature resistance. The anti-electromagnetic interference and chemical stability are very strong, so it has a great advantage in application. On the other hand, because of the dynamic grating in the fiber sensor. Since adaptive interferometers and optical memory devices have important applications, the dynamic grating written in erbium-doped fiber has attracted much attention. Dynamic grating has some special advantages, such as the center wavelength of grating. The intensity and linewidth of the grating are dynamically adjustable. In this paper, the inherent advantages of the fiber Bragg grating and the dynamic fiber grating are utilized. The F-P cavity based on erbium-doped fiber dynamic grating and fiber Bragg grating is designed, and its characteristics are studied. Firstly, the dynamic grating formed in erbium-doped fiber is studied. The transmissivity and reflectivity of F-P cavity formed with fiber Bragg grating are studied. One of the important properties of F-P cavity is the transmission and reflection characteristics of dynamically modulated resonator. Compared with the F-P cavity fabricated by two fiber Bragg gratings. The adjustable system is more flexible than the fixed system, and the F-P cavity made by two fiber Bragg gratings is fixed because of the length of the cavity. The resonant response of F-P cavity can not be dynamically adjustable. We propose a tunable dynamic grating and fiber Bragg grating to form F-P cavity. Its transmission and reflection characteristics can be dynamically modulated by adjusting the Rabi frequency of coherent field. In addition, at the two ends of F-P cavity, two ultraviolet writing gratings are limited by the fabrication process. Usually two gratings are difficult to be completely symmetric, such as asymmetric grating periods. The refractive index modulation depth and so on. This asymmetry will reduce the predominance of F-P cavity. The F-P cavity formed by dynamic grating and fiber Bragg grating can only change the wavelength, the Rabi frequency of coupling field, and so on. The research results of this thesis are as follows: 1. For the specific two-level erbium-doped fiber dynamic grating model, according to the semi-classical interaction theory and coupling mode theory. The transmittance and reflectivity of the two-level erbium-doped fiber dynamic grating are calculated. The existence of the two-level erbium-doped fiber dynamic grating is verified by experiments, and the numerical analysis is carried out according to the calculated results. The reflection spectra of two-level erbium-doped fiber gratings with different parameters are drawn. 2. The transfer matrix theory is applied. The transmittance and reflectivity of the F-P cavity formed by the erbium-doped fiber dynamic grating and the fiber Bragg grating are calculated. The three parts of the dynamic F-P cavity are modulated by the parameters. Numerical analysis shows that the parameters changed are: the Rabi frequency of coherent field in dynamic fiber, the refractive index modulation depth of fiber Bragg grating and the cavity length of F-P cavity. The influence of the above parameters on the optical properties of the dynamic F-P cavity is analyzed. In this paper, the characteristics of the F-P cavity formed by the dynamic grating and the fiber Bragg grating are studied. Some references are provided for further experiments and practical applications.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN253

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