本文選題：光子晶體光纖光柵 + 橢圓形��； 參考：《南京郵電大學(xué)》2017年碩士論文

【摘要】：光子晶體光纖光柵(PCFG)是一種結(jié)構(gòu)特殊、發(fā)展迅速的光纖無(wú)源器件。與傳統(tǒng)光纖相比,其抗電磁干擾、體積小、損耗低等諸多優(yōu)勢(shì),在光通信和光傳感領(lǐng)域被廣泛的應(yīng)用。本文利用COMSOL軟件設(shè)計(jì)出兩種新型光子晶體光纖結(jié)構(gòu)模型,對(duì)比分析其模場(chǎng)特性、雙折射特性,選擇性能更優(yōu)的結(jié)構(gòu)重點(diǎn)分析。使用MATLAB軟件對(duì)該光子晶體光纖光柵在不同結(jié)構(gòu)參數(shù)下及外界環(huán)境變化下的光譜特性及傳感特性進(jìn)行仿真分析。運(yùn)用COMSOL軟件設(shè)計(jì)了兩種新型光子晶體光纖光柵結(jié)構(gòu),對(duì)比分析了兩者在相同結(jié)構(gòu)參數(shù)下的模場(chǎng)特性及雙折射特性。選擇性能更優(yōu)的包層為橢圓空氣孔結(jié)構(gòu)的光子晶體光纖作為研究對(duì)象,分析纖芯圓半徑、包層橢圓率對(duì)其雙折射及損耗特性的影響。將COMSOL仿真得到的數(shù)據(jù)與MATLAB相結(jié)合,得出了該結(jié)構(gòu)在不同光柵長(zhǎng)度、不同調(diào)制深度下的波長(zhǎng)與譜特性的變化關(guān)系。研究結(jié)果表明:隨著光柵長(zhǎng)度、調(diào)制深度的增大,該結(jié)構(gòu)光子晶體光纖布拉格光柵的反射譜會(huì)逐漸增大,但增量逐漸減小,在光柵調(diào)制深度為4-100.2?處,光柵的反射率達(dá)到最大。由此可見(jiàn),可以通過(guò)設(shè)置合適的光子晶體光纖布拉格光柵的光柵長(zhǎng)度、調(diào)制深度等參數(shù),得到實(shí)際所需的反射率。運(yùn)用基于傳輸矩陣法理論的MATLAB仿真軟件,對(duì)該包層結(jié)構(gòu)為橢圓形空氣孔的光子晶體光纖光柵在不同溫度、應(yīng)變下的傳感特性進(jìn)行分析。仿真結(jié)果表明:隨著溫度的增大,該結(jié)構(gòu)光子晶體光纖光柵光譜的諧振波長(zhǎng)均向長(zhǎng)波長(zhǎng)方向漂移,且趨勢(shì)較為明顯;隨著應(yīng)變的增大,光譜的諧振波長(zhǎng)雖然也向長(zhǎng)波長(zhǎng)方向漂移,但漂移量很小,可以忽略不計(jì)。由此可見(jiàn),該結(jié)構(gòu)光子晶體光纖光柵適合用于制作溫度傳感器。
[Abstract]:Photonic crystal fiber grating (PCFG) is a kind of fiber passive device with special structure and rapid development. Compared with traditional optical fiber, it has many advantages, such as anti-electromagnetic interference, small volume, low loss and so on. It is widely used in optical communication and optical sensing field. In this paper, two new photonic crystal fiber structure models are designed by using COMSOL software. The mode field characteristics and birefringence characteristics of the photonic crystal fiber are compared and analyzed. The spectral and sensing characteristics of the photonic crystal fiber grating under different structure parameters and changes of external environment are simulated and analyzed by MATLAB software. Two novel photonic crystal fiber grating structures are designed by using COMSOL software. The mode field and birefringence characteristics of the two gratings under the same structure parameters are compared and analyzed. A photonic crystal fiber with elliptical air pore structure is selected as the research object. The effects of core radius and cladding ellipticity on its birefringence and loss characteristics are analyzed. The relationship between wavelength and spectral characteristics of the structure under different grating length and modulation depth is obtained by combining the data obtained from COMSOL simulation with MATLAB. The results show that with the increase of grating length and modulation depth, the reflection spectrum of the structure photonic crystal fiber Bragg grating will gradually increase, but the increment will gradually decrease, at the grating modulation depth of 4-100.2? The maximum reflectivity of the grating is obtained. It can be seen that the required reflectivity can be obtained by setting appropriate parameters such as grating length and modulation depth of photonic crystal fiber Bragg grating. Using the MATLAB simulation software based on the transfer matrix method, the sensing characteristics of the photonic crystal fiber grating with elliptical air holes at different temperature and strain are analyzed. The simulation results show that the resonant wavelength of the structure photonic crystal fiber grating spectrum drifts along the direction of long wavelength with the increase of temperature, and the trend is obvious with the increase of strain. The resonant wavelength of the spectrum drifts towards the long wavelength, but the drift is very small and can be ignored. It can be seen that the structure of photonic crystal fiber grating is suitable for the fabrication of temperature sensors.
【學(xué)位授予單位】：南京郵電大學(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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