本文選題：石墨烯 + 光電調(diào)制器件��； 參考：《浙江大學》2015年博士論文

【摘要】：光通信技術在最近幾十年間取得了巨大的進步,也與我們的生活息息相關。而光通信中光電器件的設計尤為重要,伴隨著光通信技術的巨大進步,光電器件的性能也被賦予了越來越高的要求。目前光電器件普遍存在著尺寸較大、帶寬較窄、速度較慢等等亟待改善的問題。特別是調(diào)制器,隨著高速通信的飛速發(fā)展,對更高帶寬,更小半波電壓以及更小的尺寸的調(diào)制器提出要求,基于新材料的調(diào)制器成為人們研究的熱點。因此本文將二維新材料石墨烯和傳統(tǒng)的光電器件相結合,并利用全光纖結構共同設計光電器件,結合了新材料石墨烯優(yōu)越的光學性能和全光纖結構在未來全光纖光通信中應用的潛力,探索了具有高性能的光電器件。本論文對基于新材料石墨烯的全光纖器件進行了較為深入的研究。首先探究了石墨烯光電器件的理論模型以及基于石墨烯的波導調(diào)制器和偏振控制器,并且對基于石墨烯結構的調(diào)制器的原理進行了完整深入的理論分析。在此基礎上,本論文對現(xiàn)有的波導結構做出了改進.提出了兩種全光纖結構的石墨烯相位調(diào)制器和石墨烯吸收調(diào)制器,并進行了仿真和實驗分析。除此之外,受全光纖調(diào)制器的啟發(fā),本論文又提出了一種全光纖石墨烯可調(diào)偏振控制器,并進行了理論和仿真驗證,提出的偏振控制器具有大的消光比,寬的工作范圍和在一定范圍不受溫度影響等優(yōu)勢,并且第一次實現(xiàn)了光纖上的偏振態(tài)可調(diào)。本論文主要的工作和創(chuàng)新點如下1. 針對傳統(tǒng)光調(diào)制器存在的諸如調(diào)制帶寬不夠高,調(diào)制效率低和無法更好地光集成等問題,總結了新材料石墨烯應用在光調(diào)制器的研究,對石墨烯的光學特性和波導特性做了深入的理論分析,并提出了一些之前研究的不足,特別是文章中詳細分析比較了石墨烯作為各向異性和各向同性介質(zhì)時數(shù)值計算的不同,文章將石墨烯作為各向異性來考慮,更正了之前大多數(shù)石墨烯調(diào)制器研究中將石墨烯作為一種各向同性介質(zhì)的考慮,使之更接近于實際情況。2. 將新材料石墨烯和全光纖結構相結合,提出全光纖結構的石墨烯電光調(diào)制器,分別利用有效折射率的實部和虛部變化實現(xiàn)了相位調(diào)制器和吸收調(diào)制器并用數(shù)值仿真和理論數(shù)理方法對其進行了分析和計算。運用兩種基于不同工作原理的電磁波仿真軟件Comsol和FDTD分別進行了二維和三維仿真,來驗證結果的正確性。同時結合數(shù)理分析方法,驗證了仿真的正確性。并且第一次發(fā)現(xiàn)了在一定的化學勢范圍內(nèi),相位和化學勢之間的準線性關系以及相位和外加電壓之間的準二次平方關系。同時提出的利用石墨烯結構有效折射率的虛部變化來實現(xiàn)的電吸收調(diào)制器,相較傳統(tǒng)的三五族電吸收調(diào)制器具有可實現(xiàn)高消光比、小尺寸等多種優(yōu)勢。3.實驗上論證了提出的全光纖石墨烯調(diào)制器的可行性,實驗包含結構方案的確定、石墨烯的制備和轉(zhuǎn)移以及電極的設計等全部加工過程,通過搭建一個完整的微波光子鏈路,實現(xiàn)了100 MHz信號的調(diào)制,并對實驗結果進行了分析,主要分析了該調(diào)制器設計中存在的一些問題以及調(diào)制帶寬不高的原因,并提出了實驗的后續(xù)優(yōu)化方案。4. 本論文提出了一種石墨烯全光纖結構的可調(diào)偏振控制器,該方案將石墨烯均勻生長在光纖的表面,通過改變不同方向上石墨烯的外加電壓,獲得水平方向偏振態(tài)通或者垂直方向偏振態(tài)通的偏振控制器,從而在一個光器件上實現(xiàn)了偏振可調(diào)。利用新材料石墨烯,設計了一種全光纖結構的偏振態(tài)可調(diào)偏振控制器。同時該偏振控制器具有大的消光比,寬的工作范圍和在一定范圍不受溫度影響等優(yōu)勢。本論文主要對新材料石墨烯全光纖調(diào)制器件進行了研究,提出了兩種全光纖石墨烯調(diào)制器和一種全光纖石墨烯可調(diào)偏振控制器。本論文采用了理論建模分析、仿真數(shù)值計算、實驗設計驗證和結果分析等研究方法,并取得了一定的成果,但由于實驗條件的限制,部分方案還只停留在仿真結果上,有待后續(xù)實驗的進一步驗證。
[Abstract]:Optical communication technology has made great progress in the last few decades, and it is closely related to our life. The design of optoelectronic devices is particularly important in optical communication. With the great progress of optical communication technology, the performance of optoelectronic devices has been given higher and higher requirements. Narrow, slow, and so on. In particular, the modulator, with the rapid development of high speed communication, demands for higher bandwidth, smaller half wave voltage and smaller size modulator. The modulator based on the new material has become the hot spot of research. Combined with the use of all optical fiber structures to jointly design optoelectronic devices, combined with the superior optical properties of new materials graphene and the potential of all optical fiber structures in the future full optical fiber optical communication, a high performance optoelectronic device is explored. This paper has carried out a more in-depth study of all fiber devices based on the new material of graphene. The theoretical model of graphene optoelectronic devices and the waveguide modulator based on graphene and the polarization controller are explored, and the principle of the modulator based on the graphene structure is thoroughly and deeply theoretically analyzed. On this basis, the existing waveguide structures are improved in this paper. Two kinds of all fiber structured graphene are proposed. The phase modulator and the graphene absorption modulator have been simulated and analyzed. In addition, inspired by the whole fiber modulator, a kind of all-optical fiber graphene adjustable polarization controller is proposed in this paper, and the theoretical and simulation verification is carried out. The proposed polarization controller has large extinction ratio, wide range of work and a certain extent. The main work and innovation points in this paper are as follows: 1. for the traditional light modulator, such as low modulation bandwidth, low modulation efficiency and no better optical integration, the application of new material graphene in light modulator is summarized. The theoretical analysis of the optical and waveguide characteristics of graphene is made, and some shortcomings of the previous research are put forward. In particular, the difference between the numerical calculation of graphene as anisotropic and isotropic medium is analyzed and compared in detail. This article considers graphene as anisotropy and corrects most of the previous stones. In the study of the graphene modulator, graphene is considered as an isotropic medium, making it closer to the actual situation..2. combines the new material graphene with the whole fiber structure, and proposes a fully fiber structured graphene electro-optic modulator. The phase modulator and absorption modulation are realized by using the real and imaginary parts of the effective refractive index. The device is analyzed and calculated by numerical simulation and theoretical mathematical method. Two kinds of electromagnetic wave simulation software based on different working principles, Comsol and FDTD, are used to verify the correctness of the results, and the correctness of the simulation is verified by the mathematical analysis method. In a certain chemical potential range, the quasi linear relationship between phase and chemical potential and the quasi two square relation between the phase and the applied voltage. At the same time, the electronic absorption modulator, which is realized by the virtual part change of the effective refractive index of the graphene structure, can achieve high extinction ratio compared with the traditional 35 electric absorption modulator. The feasibility of all optical fiber graphene modulator is demonstrated by.3. experiments. The experiment includes the determination of the structure scheme, the preparation and transfer of graphene and the design of the electrode. By building a complete microwave photon link, the modulation of the 100 MHz signal is realized, and the experimental results are carried out. In this paper, some problems in the design of the modulator and the reasons for the low modulation bandwidth are analyzed, and a follow-up optimization scheme of the experiment.4. is put forward in this paper. A kind of adjustable polarization controller for the whole fiber structure of graphene is proposed in this paper. This scheme makes the graphene uniformly grow on the surface of the fiber and changes the upper stone in different directions. The polarization controller of the polarized state of the horizontal polarization state or the vertical polarization state is obtained, thus realizing the polarization adjustable on a light device. Using the new material graphene, a polarizing polarization controller for all fiber structures is designed. The polarization controller has large extinction ratio and wide operation. In this paper, two kinds of all fiber graphene modulator and a full fiber graphene adjustable polarization controller are proposed in this paper. The theoretical modeling analysis, simulation numerical calculation, experimental design verification and results are used in this paper. Analysis and other research methods, and achieved certain results, but due to the limitations of the experimental conditions, some of the schemes still only remain on the simulation results, which need further verification of the follow-up experiments.

【學位授予單位】：浙江大學
【學位級別】：博士
【學位授予年份】：2015
【分類號】：TN929.1;TN761
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本文編號：1820610