發(fā)布時(shí)間：2018-04-06 05:41

  本文選題：模式復(fù)用　切入點(diǎn)：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(lái)應(yīng)對(duì)單模光纖面臨的香農(nóng)極限問(wèn)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(shí)將多個(gè)模式復(fù)用/分離進(jìn)入一個(gè)或多個(gè)波導(dǎo)。本文結(jié)合國(guó)內(nèi)外的研究現(xiàn)狀,基于理論分析及仿真結(jié)果,分別對(duì)光纖型和波導(dǎo)型的模式復(fù)用解復(fù)用器進(jìn)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(duì)波導(dǎo)中傳輸?shù)哪Ｊ竭M(jìn)行仿真和分析。同時(shí)對(duì)波導(dǎo)中傳輸?shù)哪Ｊ秸�交性以及利用耦合模理論�?duì)波導(dǎo)間各個(gè)模式發(fā)生耦合及轉(zhuǎn)換進(jìn)行了詳細(xì)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(shí)實(shí)現(xiàn)模式轉(zhuǎn)換以及模式(解)復(fù)用。利用COMSOL軟件對(duì)該器件進(jìn)行仿真分析,得到該器件分別實(shí)現(xiàn)模式復(fù)用和解復(fù)用時(shí)輸入端及輸出端的光場(chǎng)分布圖。提出通過(guò)計(jì)算復(fù)用器輸出端光場(chǎng)與標(biāo)準(zhǔn)模式場(chǎng)的重疊積分值以及解復(fù)用器各個(gè)輸出端口光功率比值得到該器件實(shí)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(duì)實(shí)現(xiàn)模式(解)復(fù)用效率的影響。結(jié)果表明:當(dāng)復(fù)用器拉錐長(zhǎng)度為3.88 cm時(shí)實(shí)現(xiàn)模式復(fù)用的效果最好,輸出端的三個(gè)模斑與其對(duì)應(yīng)的標(biāo)準(zhǔn)模式場(chǎng)的相似度分別為0.8991、0.6834、0.5080;改變拉錐長(zhǎng)度對(duì)LP01模向LP01、LP11a模的轉(zhuǎn)換沒(méi)有太大的影響,但是對(duì)LP01模向LP11b模的轉(zhuǎn)換影響較大;解復(fù)用器長(zhǎng)度為3.8931 cm時(shí)實(shí)現(xiàn)解復(fù)用的效果最好,各個(gè)模式經(jīng)過(guò)轉(zhuǎn)換后在輸出端對(duì)應(yīng)的端口光強(qiáng)為最大。(3)利用FDTD(Finite Difference Time Domain)算法分別對(duì)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(jìn)行設(shè)計(jì)及仿真,得到了器件內(nèi)實(shí)現(xiàn)模式復(fù)用解復(fù)用時(shí)的光場(chǎng)傳輸圖,通過(guò)計(jì)算解復(fù)用器輸出端各個(gè)端口輸出的能量比值得到損耗以及串?dāng)_,并且討論了改變器件結(jié)構(gòu)及工作波長(zhǎng)對(duì)串?dāng)_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?dāng)_均低于-20dB;在1.55μm波長(zhǎng)處滿足相位匹配條件,模式轉(zhuǎn)換的效率最高,串?dāng)_也最小;當(dāng)耦合區(qū)域內(nèi)波導(dǎo)間隙增大,串?dāng)_最低點(diǎn)的波長(zhǎng)會(huì)向著大于1.55μm處移動(dòng)。根據(jù)仿真結(jié)果,對(duì)條形波導(dǎo)模分復(fù)用解復(fù)用器進(jìn)行了 SOI硅片的工藝制作、測(cè)試及分析。最后將兩種結(jié)構(gòu)下的器件進(jìn)行對(duì)比,發(fā)現(xiàn)脊型波導(dǎo)實(shí)現(xiàn)模式轉(zhuǎn)換時(shí)所需要的耦合長(zhǎng)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?dāng)_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(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TN929.11

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 逄煥剛,何瑾琳,張志遠(yuǎn),孫小菡,張明德;高速全光型時(shí)分解復(fù)用器[J];電子器件;2000年03期

2 莫松青;單模解復(fù)用器[J];光通信技術(shù);1989年04期

3 洪;;低損耗解復(fù)用器[J];光纖與電纜及其應(yīng)用技術(shù);1989年04期

4 趙偉,鄭小平,張漢一;復(fù)用器/解復(fù)用器濾波特性研究[J];光學(xué)學(xué)報(bào);2002年09期

5 解清明;季敏寧;毛艷萍;劉珍;;基于三芯光纖的波分解復(fù)用器的研究[J];激光雜志;2014年01期

6 從容;衛(wèi)星數(shù)字接收機(jī)知識(shí)講座之四 解復(fù)用器和解碼器[J];衛(wèi)星電視與寬帶多媒體;2004年23期

7 向紅麗;楊德興;;基于分層陣列體全息光柵的波分解復(fù)用器的研究[J];紅外;2007年10期

8 龐冬青,宋軍,何賽靈;刻蝕衍射光柵解復(fù)用器的偏振色散分析[J];半導(dǎo)體學(xué)報(bào);2005年01期

9 溫亮生,伍劍,林金桐;控制光和信號(hào)光頻差對(duì)太赫茲光非對(duì)稱解復(fù)用器性能的影響[J];光學(xué)學(xué)報(bào);2003年06期

10 解清明;季敏寧;毛艷萍;劉珍;;基于正三角型三芯光纖的波分解復(fù)用器[J];激光與光電子學(xué)進(jìn)展;2014年06期

相關(guān)會(huì)議論文 前1條

1 文泓橋;盛鐘延;石志敏;何賽靈;;凹面光柵型解復(fù)用器的通帶平坦化設(shè)計(jì)[A];大珩先生九十華誕文集暨中國(guó)光學(xué)學(xué)會(huì)2004年學(xué)術(shù)大會(huì)論文集[C];2004年

相關(guān)碩士學(xué)位論文 前9條

1 謝意維;基于模分復(fù)用的高速光纖通信系統(tǒng)的關(guān)鍵技術(shù)研究[D];華中科技大學(xué);2014年

2 羅輝;基于槽式納米線微環(huán)諧振腔型偏振復(fù)用/解復(fù)用器研究[D];東南大學(xué);2016年

3 樂(lè)燕思;光纖和硅基波導(dǎo)的3模復(fù)用解復(fù)用器的研究[D];北京交通大學(xué);2017年

4 劉念;二維光子晶體波分解復(fù)用器的設(shè)計(jì)與研究[D];南昌大學(xué);2012年

5 陳麗梅;數(shù)字衛(wèi)星接收機(jī)的前端軟件設(shè)計(jì)及數(shù)字電視傳輸流復(fù)用/解復(fù)用器的方案研究[D];電子科技大學(xué);2005年

6 陳國(guó)華;MPEG-2傳輸流解復(fù)用器的硬件實(shí)現(xiàn)[D];浙江大學(xué);2007年

7 黃浩;基于MIM結(jié)構(gòu)的SPPs波分解復(fù)用器特性研究[D];西南交通大學(xué);2013年

8 馮剛;太赫茲全光解復(fù)用器（TOAD）開(kāi)關(guān)特性的理論研究[D];南京理工大學(xué);2003年

9 黃浩;基于Windows平臺(tái)的電子節(jié)目指南的實(shí)現(xiàn)[D];電子科技大學(xué);2007年

，

本文編號(hào)：1718244