本文選題：模式復(fù)用　切入點：錐形光纖　出處：《北京交通大學(xué)》2017年碩士論文

【摘要】：模分復(fù)用系統(tǒng)利用少模光纖來應(yīng)對單模光纖面臨的香農(nóng)極限問題,將模式作為傳輸信道,能夠成倍的增加光通信系統(tǒng)的傳輸容量。模式復(fù)用解復(fù)用器作為模分復(fù)用系統(tǒng)的重要器件,能夠?qū)崿F(xiàn)基模與高階模的相互轉(zhuǎn)換,同時將多個模式復(fù)用/分離進入一個或多個波導(dǎo)。本文結(jié)合國內(nèi)外的研究現(xiàn)狀,基于理論分析及仿真結(jié)果,分別對光纖型和波導(dǎo)型的模式復(fù)用解復(fù)用器進行研究。本文的主要工作如下:(1)從光纖和矩形波導(dǎo)出發(fā),研究光在兩種不同結(jié)構(gòu)波導(dǎo)中傳輸?shù)哪Ｊ教匦?并對波導(dǎo)中傳輸?shù)哪Ｊ竭M行仿真和分析。同時對波導(dǎo)中傳輸?shù)哪Ｊ秸恍砸约袄民詈夏＠碚搶Σ▽?dǎo)間各個模式發(fā)生耦合及轉(zhuǎn)換進行了詳細的推導(dǎo)。(2)介紹一種錐形光纖型三模式(解)復(fù)用器,它能夠同時實現(xiàn)模式轉(zhuǎn)換以及模式(解)復(fù)用。利用COMSOL軟件對該器件進行仿真分析,得到該器件分別實現(xiàn)模式復(fù)用和解復(fù)用時輸入端及輸出端的光場分布圖。提出通過計算復(fù)用器輸出端光場與標準模式場的重疊積分值以及解復(fù)用器各個輸出端口光功率比值得到該器件實現(xiàn)模式復(fù)用/解復(fù)用的效率,并且分析了改變器件結(jié)構(gòu)對實現(xiàn)模式(解)復(fù)用效率的影響。結(jié)果表明:當復(fù)用器拉錐長度為3.88 cm時實現(xiàn)模式復(fù)用的效果最好,輸出端的三個模斑與其對應(yīng)的標準模式場的相似度分別為0.8991、0.6834、0.5080;改變拉錐長度對LP01模向LP01、LP11a模的轉(zhuǎn)換沒有太大的影響,但是對LP01模向LP11b模的轉(zhuǎn)換影響較大;解復(fù)用器長度為3.8931 cm時實現(xiàn)解復(fù)用的效果最好,各個模式經(jīng)過轉(zhuǎn)換后在輸出端對應(yīng)的端口光強為最大。(3)利用FDTD(Finite Difference Time Domain)算法分別對條形波導(dǎo)和脊型波導(dǎo)兩種結(jié)構(gòu)下的模分復(fù)用解復(fù)用器進行設(shè)計及仿真,得到了器件內(nèi)實現(xiàn)模式復(fù)用解復(fù)用時的光場傳輸圖,通過計算解復(fù)用器輸出端各個端口輸出的能量比值得到損耗以及串擾,并且討論了改變器件結(jié)構(gòu)及工作波長對串擾的影響。結(jié)果表明:兩種結(jié)構(gòu)下的模分復(fù)用解復(fù)用器的損耗均小于1dB,串擾均低于-20dB;在1.55μm波長處滿足相位匹配條件,模式轉(zhuǎn)換的效率最高,串擾也最小;當耦合區(qū)域內(nèi)波導(dǎo)間隙增大,串擾最低點的波長會向著大于1.55μm處移動。根據(jù)仿真結(jié)果,對條形波導(dǎo)模分復(fù)用解復(fù)用器進行了 SOI硅片的工藝制作、測試及分析。最后將兩種結(jié)構(gòu)下的器件進行對比,發(fā)現(xiàn)脊型波導(dǎo)實現(xiàn)模式轉(zhuǎn)換時所需要的耦合長度小于條形波導(dǎo),但是脊型波導(dǎo)結(jié)構(gòu)下的模分復(fù)用解復(fù)用器的串擾要高于條形波導(dǎo)結(jié)構(gòu)。
[Abstract]:Mode division multiplexing system uses small mode optical fiber to deal with the Shannon limit problem faced by single mode optical fiber. Using mode as transmission channel, the transmission capacity of optical communication system can be increased exponentially.As an important device in mode division multiplexing system, mode multiplexing demultiplexer can realize the interconversion between the base mode and the higher order mode, and at the same time, multiple modes are multiplexed / separated into one or more waveguides.In this paper, based on the theoretical analysis and simulation results, the mode multiplexing demultiplexer based on optical fiber and waveguide is studied in combination with the current research situation at home and abroad.The main work of this paper is as follows: (1) based on optical fiber and rectangular waveguide, the mode characteristics of light propagation in two waveguides with different structures are studied, and the modes of transmission in waveguides are simulated and analyzed.At the same time, the mode orthogonality of transmission in waveguide and the coupling and conversion of each mode between waveguides are deduced in detail by using coupling mode theory. A tapered fiber type three-mode (demultiplexer) is introduced.It can realize both pattern conversion and pattern demultiplexing.The COMSOL software is used to simulate and analyze the device, and the light field distribution diagram of the input and output end of the device for mode multiplexing and demultiplexing is obtained respectively.It is proposed that the efficiency of mode multiplexing / demultiplexing can be obtained by calculating the overlapping integral between the output field and the standard mode field of the multiplexer and the optical power ratio of each output port of the demultiplexer.The effect of changing the device structure on the efficiency of mode demultiplexing is also analyzed.The results show that the mode reuse is the best when the length of the multiplexer is 3.88 cm.The similarity between the three speckles at the output end and their corresponding standard mode fields is 0.8991U 0.6834n0.5080.The change of the taper length has no great effect on the conversion from LP01 mode to LP01 LP11a mode, but has a great effect on the conversion from LP01 mode to LP11b mode.When the demultiplexer length is 3.8931 cm, the demultiplexing effect is the best.After each mode is converted, the corresponding port light intensity at the output end is maximum. The FDTD(Finite Difference Time domain algorithm is used to design and simulate the mode division multiplexing demultiplexer with two kinds of structures, stripe waveguide and ridge waveguide, respectively.The optical field transmission diagram of demultiplexing in the device is obtained. The loss and crosstalk are obtained by calculating the energy ratio of the output ports of the demultiplexer. The effects of changing the device structure and the working wavelength on the crosstalk are discussed.The results show that the loss of the demultiplexer is less than 1 dB and the crosstalk is lower than -20 dB, the mode conversion efficiency is the highest and the crosstalk is minimum when the wavelength is 1.55 渭 m.The wavelength at the lowest point of crosstalk will move towards more than 1.55 渭 m.According to the simulation results, the fabrication, test and analysis of the SOI wafer for the strip waveguide mode division multiplexing demultiplexer are carried out.Finally, it is found that the coupling length of the ridge waveguide is smaller than that of the strip waveguide, but the crosstalk of the demultiplexer is higher than that of the strip waveguide.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN929.11

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