本文選題：光隔離器 + 非互易相移�。� 參考：《深圳大學(xué)》2015年碩士論文

【摘要】：隨著人類社會加速進入光電信息時代,更高的系統(tǒng)響應(yīng)速度,更高的集成度和更高的帶寬是信息傳輸、處理系統(tǒng)的主要發(fā)展趨勢。作為光電信息時代處理及傳遞信息的主要載體,當前設(shè)計的集成光學(xué)信息器件都面臨著一個很重要的問題,即如何處理后向反射光的問題。光隔離器作為一種只允許光單向傳輸,反向傳輸隔離的器件,是集成光學(xué)系統(tǒng)必不可少的一部分,它可以保證光學(xué)系統(tǒng)的工作穩(wěn)定性與可靠性。但由于光隔離器只能工作在特定的波長,這對提升帶寬,提高集成度是不利的。本文研究波長不敏感型非互易相移器,在此基礎(chǔ)上進行雙波長非互易相移型磁光隔離器的設(shè)計與優(yōu)化。磁光材料的折射率及法拉第旋轉(zhuǎn)系數(shù)均與波長有關(guān)。通過分析波導(dǎo)的結(jié)構(gòu)參數(shù)對非互易相移的影響,以及對結(jié)構(gòu)參數(shù)的優(yōu)化,用非互易相移的波導(dǎo)色散抵償法拉第旋轉(zhuǎn)系數(shù)隨波長的變化,可以實現(xiàn)非互易相移對波長的不敏感。在此基礎(chǔ)上設(shè)計了雙波長非互易相移器(以1.31?m、1.55?m波長為例)。利用多模干涉耦合器自映像原理及定向耦合原理,分別設(shè)計雙波長的2x1多模干涉耦合器、2x2多模干涉耦合器及雙波長定向耦合器,對兩個波長都實現(xiàn)3 d B分束�；谝陨�,提出兩種雙波長非互易相移型磁光隔離器的設(shè)計方案。設(shè)計方案一由2x2雙波長多模干涉耦合器、雙波長非互易相移器,2x1雙波長多模干涉耦合器等構(gòu)成。經(jīng)Beam PROP軟件模擬及優(yōu)化結(jié)構(gòu)參數(shù),對波長1.55?m、1.31?m的插入損耗分別為0.30d B、0.27d B;隔離度分別為55.44d B、54.95d B。設(shè)計方案二由雙波長定向耦合器、雙波長非互易相移器、2x1雙波長多模干涉耦合器等構(gòu)成。同樣用Beam PROP軟件模擬,模擬結(jié)果顯示對1.55?m、1.31?m波長的插入損耗分別為0.25d B、0.15d B;隔離度為42.6d B、48.4d B。進一步用Beam PROP軟件分析了多模干涉耦合器的多模干涉耦合區(qū)長度及寬度對光隔離器性能的影響,分析了定向耦合器定向耦合區(qū)域兩根波導(dǎo)的間隙、耦合區(qū)長度對光隔離器性能的影響�？疾旃飧綦x器的性能,根據(jù)以上兩種方案設(shè)計的光隔離器具有以下優(yōu)點:隔離度高、插入損耗小、可批量生產(chǎn)。
[Abstract]:With the acceleration of human society into the photoelectric information age, higher system response speed, higher integration and higher bandwidth are the main development trends of information transmission and processing system. As the main carrier of information processing and transmission in the era of optoelectronic information, the integrated optical information devices are faced with a very important problem, that is, how to deal with the problem of backward reflected light. Optical isolator is an indispensable part of integrated optical system which can only allow optical one-way transmission and reverse transmission isolation. It can ensure the stability and reliability of optical system. However, because the optical isolator can only work at specific wavelengths, it is disadvantageous to improve the bandwidth and integration. In this paper, the wavelength insensitive non-reciprocal phase shifter is studied, and the design and optimization of the dual-wavelength non-reciprocal phase shift magneto-optic isolator is carried out. The refractive index and Faraday rotation coefficient of magneto-optic materials are related to wavelength. By analyzing the influence of waveguide structure parameters on non-reciprocal phase shift and optimization of structural parameters, the nonreciprocal phase shift can be realized insensitive to wavelength by compensating Faraday rotation coefficient with wavelength variation with non-reciprocal phase shift dispersion. On this basis, a dual wavelength non-reciprocal phase shifter is designed. Using the principle of self-mapping and directional coupling of multi-mode interference coupler, the 2x1 multi-mode interference coupler 2x2 and the dual-wavelength directional coupler are designed respectively. The two wavelengths are divided into 3 dB beams. Based on the above, a design scheme of two-wavelength non-reciprocal phase-shifting magneto-optic isolators is proposed. The first scheme is composed of 2x2 dual-wavelength multi-mode interference coupler and dual-wavelength non-reciprocal phase shifter 2x1 dual-wavelength multi-mode interference coupler. By simulation and optimization of structural parameters by Beam PROP software, the insertion loss and isolation of 1.31m wavelength were 0.30 dB / 0.27 dB and 55.44 dB / 54.95 dB, respectively. The second scheme consists of two wavelength directional coupler and two wavelength non reciprocal phase shifter 2x1 dual wavelength multimode interference coupler. Also simulated by Beam PROP software, the results show that the insertion loss is 0.25 dB and the isolation is 42.6 dB and 48.4 dB, respectively. The influence of the length and width of the multimode interference coupling area on the performance of the optical isolator is analyzed by Beam PROP software. The gap between two waveguides in the directional coupling region of the directional coupler is analyzed. The effect of coupling zone length on the performance of optical isolator. According to the above two schemes, the optical isolator has the following advantages: high isolation, low insertion loss and mass production.
【學(xué)位授予單位】：深圳大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN256

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本文編號：1975195