双波长非互易移型磁光隔离器设计与优化

发布时间：2018-06-04 01:26

本文选题：光隔离器 + 非互易相移　；参考：《深圳大学》2015年硕士论文

【摘要】：随着人类社会加速进入光电信息时代,更高的系统响应速度,更高的集成度和更高的带宽是信息传输、处理系统的主要发展趋势。作为光电信息时代处理及传递信息的主要载体,当前设计的集成光学信息器件都面临着一个很重要的问题,即如何处理后向反射光的问题。光隔离器作为一种只允许光单向传输,反向传输隔离的器件,是集成光学系统必不可少的一部分,它可以保证光学系统的工作稳定性与可靠性。但由于光隔离器只能工作在特定的波长,这对提升带宽,提高集成度是不利的。本文研究波长不敏感型非互易相移器,在此基础上进行双波长非互易相移型磁光隔离器的设计与优化。磁光材料的折射率及法拉第旋转系数均与波长有关。通过分析波导的结构参数对非互易相移的影响,以及对结构参数的优化,用非互易相移的波导色散抵偿法拉第旋转系数随波长的变化,可以实现非互易相移对波长的不敏感。在此基础上设计了双波长非互易相移器(以1.31?m、1.55?m波长为例)。利用多模干涉耦合器自映像原理及定向耦合原理,分别设计双波长的2x1多模干涉耦合器、2x2多模干涉耦合器及双波长定向耦合器,对两个波长都实现3 d B分束。基于以上,提出两种双波长非互易相移型磁光隔离器的设计方案。设计方案一由2x2双波长多模干涉耦合器、双波长非互易相移器,2x1双波长多模干涉耦合器等构成。经Beam PROP软件模拟及优化结构参数,对波长1.55?m、1.31?m的插入损耗分别为0.30d B、0.27d B;隔离度分别为55.44d B、54.95d B。设计方案二由双波长定向耦合器、双波长非互易相移器、2x1双波长多模干涉耦合器等构成。同样用Beam PROP软件模拟,模拟结果显示对1.55?m、1.31?m波长的插入损耗分别为0.25d B、0.15d B;隔离度为42.6d B、48.4d B。进一步用Beam PROP软件分析了多模干涉耦合器的多模干涉耦合区长度及宽度对光隔离器性能的影响,分析了定向耦合器定向耦合区域两根波导的间隙、耦合区长度对光隔离器性能的影响。考察光隔离器的性能,根据以上两种方案设计的光隔离器具有以下优点:隔离度高、插入损耗小、可批量生产。
[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.
【学位授予单位】：深圳大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN256

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