發(fā)布時(shí)間：2018-03-26 18:45

  本文選題：回音壁模式　切入點(diǎn)：微球腔　出處：《南京郵電大學(xué)》2017年碩士論文

【摘要】：回音壁模式(Whispering Gallery Mode,WGM)微腔因具有品質(zhì)因子高、腔內(nèi)能量密度大、透射譜線窄等特點(diǎn)而在光纖通信及傳感領(lǐng)域具有重要的應(yīng)用價(jià)值。窄帶選模器作為光通信網(wǎng)中必不可少的關(guān)鍵器件,對(duì)提高光信息發(fā)送速率、提高信號(hào)信噪比等方面起著重要作用,WGM微腔上述特點(diǎn),使其成為一類理想的窄帶選模器。此外,WGM微腔對(duì)外界環(huán)境變化極為敏感的特性同樣使其在傳感領(lǐng)域有著廣泛應(yīng)用。本文主要圍繞WGM微球腔窄帶選模器和傳感器,研究WGM微球腔選模器的全光調(diào)諧特性以及混合介質(zhì)WGM微腔與表面等離子體共振(Surface Plasmon Resonance,SPR)效應(yīng)相結(jié)合的傳感增強(qiáng)效應(yīng)。本論文首先介紹了WGM微腔的研究進(jìn)展、微腔的類別及應(yīng)用領(lǐng)域,簡(jiǎn)要論述了WGM微球腔的電磁場(chǎng)理論及特性參數(shù),對(duì)比了幾種常見(jiàn)的微腔耦合方案,綜合考量選定錐形光纖與微球腔進(jìn)行耦合,并簡(jiǎn)述其耦合理論。在此基礎(chǔ)上建立了微球-錐形光纖耦合的有限元模型,研究純介質(zhì)微球的參數(shù)以及耦合條件對(duì)WGM共振特性的影響;采用多層介質(zhì)材料構(gòu)造Q值更高、譜線更窄的混合介質(zhì)微球腔,并對(duì)混合介質(zhì)WGM微球腔參數(shù)進(jìn)行優(yōu)化。提出一種表面等離子體(Surface Plasmons,SP)增強(qiáng)型混合介質(zhì)WGM微腔傳感器,通過(guò)混合介質(zhì)微腔與SPR效應(yīng)相結(jié)合提高了現(xiàn)有微腔傳感器的靈敏度。論文實(shí)驗(yàn)研究了兩種微球腔制備方法:包括電弧放電和CO2激光器熔融法,測(cè)試了微球表面粗糙度,確定后者形成的微球腔Q值更高,達(dá)到107量級(jí)。利用精密位移平臺(tái)搭建了微球腔-錐形光纖耦合系統(tǒng),在1550 nm波段實(shí)驗(yàn)獲得了耦合效率達(dá)90%以上、Q值約為2.1×107、透射峰譜線3dB帶寬1.2 nm的WGM透射譜。在此基礎(chǔ)上搭建了基于WGM微球腔窄帶選模的光纖激光器實(shí)驗(yàn)系統(tǒng),獲得了1550 nm波段功率為200 mW,3dB帶寬0.01 nm,邊模抑制比38 dB,全光波長(zhǎng)調(diào)諧范圍達(dá)60 pm的全光纖激光輸出。
[Abstract]:Because of the high quality factor and the high energy density in the cavity, the microcavity of whispering Gallery modem (WGM) is a kind of echo-wall mode. The narrow transmission line has important application value in the field of optical fiber communication and sensing. As an essential key device in optical communication network, narrowband mode selector can improve the transmission rate of optical information. Improving signal-to-noise ratio (SNR) plays an important role in WGM microcavity. It is a kind of ideal narrow-band mode selector. In addition, it is also widely used in the sensing field because of its sensitivity to environmental changes. This paper focuses on the narrow-band mode selector and sensor of WGM microsphere cavity. The all-optical tuning characteristics of the WGM microsphere cavity selector and the sensing enhancement effect of the mixing medium WGM microcavity combined with the surface plasmon resonance surface Plasmon resonance (SPR) effect are studied. Firstly, the research progress of the WGM microcavity is introduced. This paper briefly discusses the electromagnetic field theory and characteristic parameters of WGM microsphere cavity, compares several common coupling schemes of microcavity, and synthetically considers the coupling between tapered fiber and microsphere cavity. On the basis of this, the finite element model of the coupling of microspheres and conical fibers is established to study the influence of the parameters and coupling conditions of pure dielectric microspheres on the resonance characteristics of WGM. The parameters of WGM microsphere cavity with narrower spectral lines are optimized. A surface plasmon surface enhanced WGM microcavity sensor is proposed. The sensitivity of the existing microcavity sensor is improved by the combination of the mixed dielectric microcavity and the SPR effect. Two fabrication methods of the microsphere cavity, including arc discharge and CO2 laser melting, are experimentally studied in this paper, and the surface roughness of the microsphere is measured. It is determined that the Q value of the microsphere cavity formed by the latter is higher, reaching the order of 107. The coupling system between the microsphere cavity and the tapered fiber is built by using the precision displacement platform. The WGM transmission spectra with coupling efficiency of more than 90% and transmission peak line 3dB bandwidth of 1.2nm have been obtained by experiments at 1550 nm. An experimental system of optical fiber laser based on WGM microsphere cavity narrowband mode selection has been built. An all-fiber laser with 1550 nm power of 200mW ~ (3) dB bandwidth of 0.01 nm, an edge-mode rejection ratio of 38 dB and a wavelength tuning range of 60 pm has been obtained.
【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)】：TN929.1

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