共查询到19条相似文献,搜索用时 46 毫秒
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为满足小型光纤陀螺对光学器件小体积的要求,对铌酸锂多功能集成光学小型化器件的结构做了分析和优化设计。采用BPM软件分析了Y形分支波导的S形波导损耗与弯曲长度及折射率差的关系。通过调整退火质子交换的工艺参数,增加了波导对光的束缚能力;降低了小型化芯片上S形波导的弯曲损耗;去掉了原有Y形波导的输出端直波导,直接由S形弯曲波导引至输出端,在更短的芯片上得到了更长的弯曲过渡区。设计制作的芯片长度由常规的20 mm减至12.5 mm,封装后的器件长度减小到20 mm,为目前同类常规器件尺寸的2/3。设计制作的器件插入损耗典型值小于2.5 dB,全温损耗变化量小于0.2 dB。 相似文献
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设计了一种聚甲基丙烯酸甲酯(PMMA)基的单偏振单模(SPSM)微结构聚合物光纤(MPOF)。利用全矢量有限元法和光束传播法相结合分析了这种光纤的偏振特性和约束损耗。通过优化光纤结构参数,发现在0.51 μm~0.62 μm的可见光波长范围,由于基模两个正交偏振模的截止波长不同,这种微结构聚合物光纤只能传输基模中的一个偏振模,从而实现单偏振单模运转。该11圈圆空气孔六角排列光纤结构的传导偏振模在0.57 μm波长处约束损耗仅为1.13 dB/m,这种低损耗的单偏振单模微结构聚合物光纤可有效消除传统保偏光纤固有的偏振串扰和偏振模色散。 相似文献
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文章简要介绍了利用光子晶体实现微纳尺度上光调控的物理原理和工作机制,重点讨论了如何利用光子晶体的缺陷态实现微纳尺度的各种集成光电子器件,并结合文章作者所在研究组的研究工作经验,简单回顾了各种类型的集成光电子器件的工作原理、物理实现和光学特性. 相似文献
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文章简要介绍了利用光子晶体实现微纳尺度上光调控的物理原理和工作机制,重点讨论了如何利用光子晶体的缺陷态实现微纳尺度的各种集成光电子器件,并结合文章作者所在研究组的研究工作经验,简单回顾了各种类型的集成光电子器件的工作原理、物理实现和光学特性. 相似文献
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光波导-光纤自动调芯系统研究 总被引:12,自引:4,他引:12
设计了两种适用于光波导高精度自动对接耦合的调芯方案,从原理上克服了常规调芯过程中微变信号精确测试的困难。完成了调芯系统的光机电一体化、控制程序和接口界面。单模光纤作为标准波导的端面耦合自动凋芯试验显示,平均耦合损耗分别为0.075 dB(1310nm波长)和0.062 dB(1550nm波长),相应的标准误差分别为0.0099 dB和0.0066 dB.调芯过程在2min内完成。单模光纤-单模波导-单模光纤的对接耦合实验结果表明,端面耦合损耗平均值分别为0.140 dB(1310nm波长)和0.109 dB(1550nm波长),标准误差分别为0.0082dB和0.0107dB,调芯时间累计不超过8min。 相似文献
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Fast Integrated Electro-Optical Switch and Beam Deflector Based on Nematic Liquid Crystal Waveguides
L. Sirleto L. Petti P. Mormile G. C. Righini G. Abbate 《Fiber and Integrated Optics》2002,21(6):435-449
In this paper, the design, the realization, and the experimental characterization of an integrated electro-optical switch and a beam deflector, both based on planar nematic liquid crystal (NLC) waveguides, are reported.
In order to test such devices, a particular waveguide structure consisting of a three-stage device, having a thin nematic LC film as the middle stage and two glass waveguides as the other stages, has been designed and realized. The electro-optical behavior and the response time have been studied for different configurations for both TE and TM polarized light. By a proper choice of the material parameters and because of the presence of an additional constant bias voltage, we got response time in the microsecond range. The experimental results obtained are very promising in the frame of integrated electro-optical devices, even if the effect underlying the results is not yet understood and probably needs some deeper research into liquid crystal physics and surface interactions. 相似文献
In order to test such devices, a particular waveguide structure consisting of a three-stage device, having a thin nematic LC film as the middle stage and two glass waveguides as the other stages, has been designed and realized. The electro-optical behavior and the response time have been studied for different configurations for both TE and TM polarized light. By a proper choice of the material parameters and because of the presence of an additional constant bias voltage, we got response time in the microsecond range. The experimental results obtained are very promising in the frame of integrated electro-optical devices, even if the effect underlying the results is not yet understood and probably needs some deeper research into liquid crystal physics and surface interactions. 相似文献
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Fast Integrated Electro-Optical Switch and Beam Deflector Based on Nematic Liquid Crystal Waveguides
L. Sirleto L. Petti P. Mormile G. C. Righini G. Abbate 《Fiber and Integrated Optics》2013,32(6):435-449
In this paper, the design, the realization, and the experimental characterization of an integrated electro-optical switch and a beam deflector, both based on planar nematic liquid crystal (NLC) waveguides, are reported. In order to test such devices, a particular waveguide structure consisting of a three-stage device, having a thin nematic LC film as the middle stage and two glass waveguides as the other stages, has been designed and realized. The electro-optical behavior and the response time have been studied for different configurations for both TE and TM polarized light. By a proper choice of the material parameters and because of the presence of an additional constant bias voltage, we got response time in the microsecond range. The experimental results obtained are very promising in the frame of integrated electro-optical devices, even if the effect underlying the results is not yet understood and probably needs some deeper research into liquid crystal physics and surface interactions. 相似文献
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选择合适的特征谱线是以内标法对激光诱导击穿光谱进行定量化分析的前提,需要科研工作者精心分析和比较,往往耗费大量精力和时间,而且还不能保证结果最优。基于遗传算法为内标法提出了一种从原始光谱中自动选择分析线和参考线的方法,使用该方法从低合金钢样的LIBS光谱中为锰(Mn)、镍(Ni)、铬(Cr)、硅(Si)和铁(Fe)元素分别选择了用于内标法定量分析的分析线和参考线。优选得到的最优谱线为,Mn的分析线和相应的参考元素Fe的参考线分别是403.306 8和368.745 7 nm,Si的分析线和相应的参考元素Fe的参考线分别是288.157 7和427.176 1 nm,Cr的分析线和相应的参考元素Fe的参考线分别是286.510 0和272.753 9 nm,Ni的分析线和相应的参考元素Fe的参考线分别是352.453 6和358.698 5 nm。最后基于优选得到的谱线以内标法对这些元素分别进行了定量分析,结果证明,使用这种谱线选择方法能够自动从原始光谱中找到最优特征谱线,使内标法定量分析得到最好的结果。 相似文献
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L. Sirleto D. S. Hermann G. Scalia L. Komitov F. De Marco G. Abbate M. Lindgren P. Mormile G. C. Righini 《Fiber and Integrated Optics》2002,21(4):277-293
Two integrated electro-optic switches based on smectic C * ferroelectric liquid crystal (FLC) planar waveguides oriented in the bookshelf geometry have been designed and realized. In order to test the first switch, a particular waveguide structure consisting of a three-stage device, having a thin FLC film middle stage and two glass waveguides as other stages, has been designed and realized. The second one is realized by a planar waveguide with a smectic C * ferroelectric liquid crystal overlayer. In this article the design, the realization, and the experimental characterization of electro-optical switches are reported. The electro-optical behavior and the response time of both devices have been studied for different configurations for both TE and TM polarization. Our main aim was to demonstrate the feasibility of an integrated electro-optic device based on a FLC waveguide, and our experimental results provide a number of interesting indications about device optimization and practical applications. 相似文献