本文選題：長周期光纖光柵 + 包層折射率調(diào)制�。� 參考：《湖南大學(xué)》2016年博士論文

【摘要】：光纖光柵是近二十年來傳感和通信領(lǐng)域發(fā)展最為迅速的無源光器件之一。光纖光柵傳感技術(shù)具有靈敏度高、抗電磁干擾以及與現(xiàn)有光電器件兼容性好等優(yōu)點(diǎn),已成為實(shí)現(xiàn)智能材料與結(jié)構(gòu)的重要途徑之一。長周期光纖光柵(LPFG)能夠?qū)崿F(xiàn)同向傳輸纖芯導(dǎo)模和包層模間的能量交換或模式耦合,從而在其透射譜諧振波長處產(chǎn)生分立的諧振峰。目前LPFG及其相關(guān)器件的研究主要集中于帶阻型纖芯折射率調(diào)制LPFG,且已報(bào)道了較完善的理論體系。然而,隨著工程建筑和環(huán)境安全等問題越來越受到人們的重視,探索更多類型的能“感知”工程結(jié)構(gòu)以及環(huán)境變化的高靈敏光纖傳感方案已成為人們的迫切愿望。本文系統(tǒng)研究了新型包層折射率調(diào)制LPFG(C-LPFG)及其相關(guān)器件的模式耦合原理以及折射率傳感特性,并取得了以下幾個(gè)方面的研究成果:1.應(yīng)用光纖分層和離散化處理方法,詳細(xì)推導(dǎo)了三層模型開放波導(dǎo)光纖光柵線偏振模色散方程以及分層耦合模理論(MCMT)。將分層光纖光柵折射率調(diào)制函數(shù)應(yīng)用到封閉波導(dǎo)光纖光柵復(fù)耦合模理論(CCMT),從而擴(kuò)展了MCMT和CCMT理論的應(yīng)用范圍,為復(fù)雜折射率調(diào)制光纖光柵的仿真分析提供了強(qiáng)有力的理論基礎(chǔ)。2.復(fù)雜包層折射率調(diào)制可簡化為三個(gè)參量:調(diào)制角度?θ、調(diào)制深度?r以及調(diào)制幅度clδn。研究表明,非均勻包層折射率調(diào)制引起纖芯導(dǎo)模同時(shí)耦合至低階LP0j和高階LP vj(v≥1)包層模;高階模式耦合的諧振峰LP01,vj(v≥1)是由相應(yīng)的兩個(gè)偏振模式(C vj LP和S vj LP)耦合諧振峰合成,且隨?θ變化具有典型的周期特征;諧振峰強(qiáng)度01,res vj T會(huì)出現(xiàn)與耦合相位以及模場分布相關(guān)的極值點(diǎn);諧振波長01,res vjλ會(huì)出現(xiàn)相應(yīng)的紅移(?θ變化時(shí))或藍(lán)移(?r變化時(shí));clδn變化引起01,res vj T線性變化;在不考慮偏振時(shí),低階和高階模式諧振峰LP01,vj具有類似的折射率傳感特性,其平均靈敏度達(dá)到01,S vj≈760nm/RIU。在此基礎(chǔ)上,初步研究了包層折射率調(diào)制傾斜LPFG(TLPFG)的折射率傳感特性,其最大靈敏度達(dá)到01,0S j=1918.4nm/RIU,高于非傾斜LPFG的靈敏度。3.提出一種高靈敏鍍銀膜C-LPFG的SPR折射率傳感方案(C-LPFG型SPR)。通過對(duì)SPR模式的色散曲線及其導(dǎo)數(shù)、模場分布因子等參量的研究,揭示了SPR模式的激勵(lì)原理以及折射率傳感原理:SPR模式來源于有效折射率實(shí)部接近于環(huán)境折射率SRI的高階EH包層模,SPR模式色散曲線隨SRI變化發(fā)生整體漂移而保持形狀不變,導(dǎo)致SPR模式諧振波長出現(xiàn)漂移,從而實(shí)現(xiàn)高靈敏C-LPFG型SPR傳感。研究發(fā)現(xiàn),當(dāng)包層半徑從62.5cl r=μm減小至22.25cl r=μm時(shí),C-LPFG型SPR的折射率靈敏度從2900/SRI S≈nm RIU提高至4900/SRI S≈nm RIU(SRI的變化范圍為1.33 1.337SRI≤n≤),均高于普通的纖芯折射率調(diào)制LPFG的SPR傳感靈敏度。4.提出一種高靈敏帶通型C-LPFG折射率傳感方案。其基本原理為:輸入光直接耦合至光纖包層并激勵(lì)起包層模式,其中滿足PMC條件的包層模式傳輸至包層中的光柵區(qū)域時(shí)再次耦合至纖芯并輸出,從而其輸出光譜具有典型的帶通特性。研究發(fā)現(xiàn),諧振波長處于TAP附近的帶通型C-LPFG具有非常高的折射率靈敏度;減小包層半徑后(14.6cl r=μm),其最大平均折射率靈敏度高達(dá)SRI=4757.6nm/US RI,相應(yīng)的最大局部折射率靈敏度達(dá)到6000/SRI≈n S m RIU(1.33 1.36SRI≤n≤),高于同類型傳統(tǒng)的帶阻型LPFG傳感。5.提出一種高靈敏帶通型鍍非金屬膜C-LPFG(CC-LPFG)的折射率傳感方案。鍍非金屬膜C-LPFG的模式發(fā)生模式轉(zhuǎn)化后,其模場分布轉(zhuǎn)移至膜層內(nèi),從而增大了光纖模式與外界環(huán)境的相互作用。研究表明,帶通型CC-LPFG(17.56cl r=μm)的最大平均折射率靈敏度和最大局部靈敏度高達(dá)4S SRI2.12×=10 nm/RIU和3.5 104/SRI=×nm IUS R(1.33 1.34SRI≤n≤),具有非常明顯的傳感優(yōu)勢(shì)。6.初步研究了帶通型C-LPFG的帶通濾波特性,為后續(xù)可調(diào)諧寬帶以及窄帶帶通濾波器的研究提供了理論基礎(chǔ)。
[Abstract]:Fiber Bragg grating (FBG) is one of the most rapidly developing passive optical devices in the field of sensing and communication in the past twenty years. Fiber Bragg grating sensing technology has the advantages of high sensitivity, anti electromagnetic interference and good compatibility with existing optoelectronic devices. It has become one of the most important ways to realize intelligent materials and structures. Long period fiber gratings (LPFG) can be realized. The energy exchange or mode coupling between the guide and cladding modes of the core is transmitted at the same direction, thus generating a discrete resonant peak at the length of the resonant wave of the transmission spectrum. The current research on LPFG and its related devices is mainly focused on the band resistance fiber core refractive index modulation (LPFG), and has reported a more perfect theoretical system. However, with the safety of engineering and environmental safety More and more attention has been paid to such problems. It is an urgent desire to explore more types of high sensitive optical fiber sensing schemes which can "perceive" engineering structures and change the environment. This paper systematically studies the mode coupling principle of the novel cladding refractive index modulation LPFG (C-LPFG) and its related devices, as well as the sensing characteristics of the refractive index. The following achievements are obtained: 1. using the optical fiber layered and discrete processing methods, the three layer model open waveguide fiber grating line polarization mode dispersion equation and the layered coupled mode theory (MCMT) are derived in detail. The refractive index modulation function of the layered fiber grating is applied to the closed waveguide fiber Bragg grating complex mode theory (CCMT). The application range of MCMT and CCMT theory is extended, which provides a strong theoretical basis for the simulation analysis of complex refractive index modulation fiber Bragg gratings..2. complex cladding refractive index modulation can be simplified as three parameters: modulation angle, theta, modulation depth, R and modulation amplitude CL delta n. research shows that the non uniform cladding refractive index modulation causes core conductance. The mode is coupled to the low order LP0j and the high order LP VJ (V > 1) cladding mode, and the resonant peak LP01 of the high-order mode coupling, VJ (V > 1) is synthesized by the corresponding two polarization modes (C VJ LP and S VJ), and has typical periodic characteristics with the variation of? Theta. The resonant peak intensity is 01, which is related to the coupling phase and the distribution of the mode field. The extreme value point; the resonance wavelength 01, res VJ lambda will appear the corresponding red shift (? Theta change) or blue shift (? R change); CL delta N changes cause 01, res VJ T linear change; in the absence of polarization, the low order and high order mode resonant peak LP01, VJ has the similar refractive index sensing specificity, the average sensitivity reaches 01, S VJ The refractive index sensing characteristic of the clad refractive index modulation inclined LPFG (TLPFG) is studied. The maximum sensitivity is 01,0S j=1918.4nm/RIU and is higher than the sensitivity.3. of the non inclined LPFG. A SPR refractive index sensing scheme (C-LPFG type SPR) for a highly sensitive silver coating C-LPFG is proposed. The dispersion curve and its derivative, the mode field distribution factor and other parameters are used for the SPR mode. The study of quantity reveals the excitation principle of SPR mode and the principle of refractive index sensing: the SPR mode comes from the high order EH cladding mode of the effective refractive index close to the environmental refractive index SRI, and the SPR mode dispersion curve keeps the whole drift with the change of SRI, which leads to the drift of the resonant wavelength of the SPR mode, thus realizing the high sensitive C-LP. FG SPR sensing. It is found that when the radius of the cladding is reduced from 62.5cl r= to 22.25cl r= mu, the refractive index sensitivity of the C-LPFG SPR is higher than that of the 2900/SRI S, which is higher than that of the ordinary fiber core refractive index modulation. The basic principle of the band pass type C-LPFG refractive index sensing scheme is that the input light is directly coupled to the fiber cladding and excites the cladding mode, in which the cladding mode satisfying the PMC condition is transmitted to the grating region in the cladding to be coupled to the core and output again, and the output spectrum has typical band-pass characteristics. The band pass type C-LPFG near TAP has a very high refractive index sensitivity; after reducing the radius of the cladding (14.6cl r= mu m), the sensitivity of its maximum average refractive index is as high as SRI=4757.6nm/US RI, and the corresponding maximum local refractive index sensitivity reaches 6000/SRI n S m RIU (1.33 < < < < < <). A highly sensitive birefringence sensing scheme for C-LPFG (CC-LPFG) with a non-metallic film is presented. After the mode transformation of the non metallic film C-LPFG, the distribution of the mode field is transferred to the film layer, thus increasing the interaction between the optical fiber mode and the external environment. The study shows that the maximum average refractive index of the band-pass CC-LPFG (17.56cl r= mu m) is the maximum index of refraction. The sensitivity and maximum local sensitivity are as high as 4S SRI2.12 x =10 nm/RIU and 3.5 104/SRI= * nm IUS R (1.33 1.34SRI < < n <). It has a very obvious sensing advantage.6. preliminary study on bandpass bandpass filter characteristics, which provides a theoretical basis for the study of subsequent tunable broadband and narrowband bandpass filters.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2016
【分類號(hào)】：TN253

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