本文選題：模階數(shù)轉(zhuǎn)換器　切入點(diǎn)：多模干涉　出處：《物理學(xué)報(bào)》2017年07期 　論文類(lèi)型：期刊論文

【摘要】：提出了一種基于硅基槽式納米線結(jié)構(gòu)的緊湊式1×2多模干涉器型模階數(shù)轉(zhuǎn)換器,其中輸入/輸出通道為槽式直波導(dǎo),經(jīng)線性錐形過(guò)渡器連接居于中心的二次錐形槽式多模波導(dǎo).采用全矢量頻域有限差分法詳細(xì)分析了垂直槽波導(dǎo)的模式特性,選取電場(chǎng)主分量E_y得到增強(qiáng)的quasi-TM模作為轉(zhuǎn)換器的光信號(hào)模式.對(duì)比分析了矩形結(jié)構(gòu)與二次錐形結(jié)構(gòu)中的周期自鏡像效應(yīng),發(fā)現(xiàn)二次錐形結(jié)構(gòu)尺寸更短、損耗更低的特點(diǎn).根據(jù)自鏡像效應(yīng)中一階模成像位置設(shè)計(jì)多模干涉區(qū)域長(zhǎng)度,經(jīng)線性錐形過(guò)渡器從較寬輸出端口輸出一階模,從較窄輸出端口輸出基模,從而實(shí)現(xiàn)模階數(shù)轉(zhuǎn)換功能.采用三維有限時(shí)域差分法詳細(xì)分析了該轉(zhuǎn)換器的光波傳輸特性,詳細(xì)討論了器件關(guān)鍵結(jié)構(gòu)參數(shù)的制作容差.參數(shù)優(yōu)化結(jié)果表明,該轉(zhuǎn)換器的多模干涉區(qū)域的尺寸為3×5μm~2時(shí),在1.55μm工作波長(zhǎng)下,quasi-TM基模在輸出quasi-TM一階模端口的插入損耗約為0.35 dB,輸出波導(dǎo)間的串?dāng)_約為-16.9 dB.另外,給出了輸入模場(chǎng)主分量在器件中的傳輸演變情況.
[Abstract]:A compact 1 脳 2 multimode interferometer type A / D converter based on silicon channel nanowire structure is proposed, in which the input / output channels are slot straight waveguides. The second conical slot multimode waveguide is connected with a linear conical transition device. The mode characteristics of the vertical slot waveguide are analyzed in detail by using the full vector frequency domain finite difference method. The enhanced quasi-TM mode obtained from the electric field principal component Estack is selected as the optical signal mode of the converter. The periodic self-mirroring effect in the rectangular structure and the secondary conical structure is compared and analyzed. It is found that the size of the secondary conical structure is shorter than that of the secondary conical structure. According to the position of the first mode imaging in the self-mirroring effect, the length of the multimode interference region is designed, and the first order mode is output from the wider output port and the base mode is output from the narrower output port through the linear conical converter. The optical wave transmission characteristics of the converter are analyzed in detail by using 3D finite-time-domain difference method, and the fabrication tolerances of the key structural parameters of the device are discussed in detail. The results of parameter optimization show that, The size of the multimode interference region of the converter is 3 脳 5 渭 m ~ 2:00. The insertion loss of quasi-TM base mode at the output quasi-TM first-order mode port is about 0.35 dB, and the crosstalk between output waveguides is -16.9 dB at 1.55 渭 m operating wavelength. The transmission evolution of the input mode master component in the device is given.
【作者單位】： 東南大學(xué)電子科學(xué)與工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金(批準(zhǔn)號(hào):11574046,60978005) 江蘇省自然科學(xué)基金(批準(zhǔn)號(hào):BK20141120)資助的課題~~
【分類(lèi)號(hào)】：TN252;TB383.1

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