共查询到20条相似文献,搜索用时 15 毫秒
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提出了一种基于平面光波导谐振腔的可调谐光电振荡器.该振荡器中,相位调制器串联光波导谐振腔,取代了传统系统中的强度调制器、长光纤和滤波器.由于光学谐振腔对光子频率和相位敏感,调节激光器改变输出光的波长,不仅可以调制光的强度,还可以对微波光子进行选频输出.当光子在波导腔中发生谐振时,产生很强的延时特性,可以取代传统系统中的长光纤.整个光电振荡器系统体积为长29.5cm、宽21cm、高7cm.实验中,改变0.1pm的光子波长,能够产生步长为12.535.5 MHz的调谐,调谐范围达2 GHz,且系统能够产生10 GHz的微波信号,在中心频率为10 GHz处其相位噪声为-109.7dBc/Hz@10kHz.该研究为光电振荡器的小型化和实用化提供了一种新的思路. 相似文献
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Wang Wenhui Tang Yanzhe Wang Yunxiang Qu Hongchang Wu Yaming Li Tie Yang Jianyi Wang Yuelin Liu Ming 《Optical and Quantum Electronics》2004,36(6):559-566
An optical wavelength demultiplexer with the etched diffraction grating (EDG) on the silicon-on-insulator (SOI) material is
demonstrated. Fabricated by the wet-anisotropic-etching method, 90° turning mirrors are used to bend waveguides, and the size
of the EDG-based demultiplexer is minimized to only 16×2.5 mm2. The crosstalk is below −16 dB. The on-chip loss is about 9.97 dB, which is composed of about 8.72 dB excess loss and 1.25
dB diffraction loss. The polarization-dependent central wavelength shift is below 0.13 nm, and the polarization-dependent
loss is about 0.35 dB. The sources of the crosstalk and loss are discussed in details, and the related measures to improve
the performance are also presented. 相似文献
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为实现红外光谱仪器的小型化,通过分析现有小型光谱仪,提出了一种基于平板波导的小型红外光栅光谱仪的设计方法。平板波导光谱仪的小型化原理与一般的微小型光谱仪不同。在平板波导光谱仪中,光束被限制在一层薄薄的平板波导介质中传播,看起来像是整个光学系统被压扁了。在垂直于平板波导的方向上光学元件的尺寸可以做到很小,从而显著减小光学系统的尺寸。该系统的设计可分为Czerny-Turner结构设计、波导结构设计。先根据像差理论设计Czerny-Turner结构,目标是保证光谱分辨率及校正像差;然后根据几何光学理论设计波导结构,包括平板波导和两个柱面透镜,目标是压缩光束并校正像散;最后将它们输入Zemax软件中进行综合优化,以获得最优的光学系统。据此方法设计了一个平板波导红外光栅光谱仪,工作波段为8~12 μm,数值孔径为0.22,采用线阵探测器。通过Zemax软件对结果进行分析和评价,表明仪器光学系统的尺寸为130 mm×125 mm×20 mm,工作波段内光谱分辨率达到80 nm,满足设计指标要求。证明了该优化设计方法是可行的,所得系统尺寸小、性能高。 相似文献
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Cr:LiNbO_3PlanarWaveguide¥ZHUShengxiang;JIANGXuyang;QIUYuanwu(PohlInstitute,TongjiUniversity,shanghai200092)WUYongjian;XUZhen?.. 相似文献
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A dispersion equation for the eigenwaves of a metallized two-layer waveguide with chiral and ferrite layers is obtained. The dispersion characteristics of this structure are analyzed. 相似文献
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S. V. Kozhevnikov V. D. Zhaketov Yu. N. Khaydukov F. Ott F. Radu 《Journal of Experimental and Theoretical Physics》2017,125(6):1015-1025
The propagation of neutrons in the middle layer of a planar waveguide in the form of a three-layer thin film has been investigated. The microbeam from the end face of the film has been registered. The neutron channeling length has been measured as a function of the thickness of the upper waveguide layer and the resonance order. The experimental data have been compared with theoretical results. 相似文献
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平板波导内的场按自由空间传播的厄米高斯函数展开,计算了平板波导谐振腔的耦合损失,给出了平板波导中EH11模的耦合损失与球镜的曲率及位置的关系。结果表明存在两种特定的结构使耦合损失最小。 相似文献
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Kozhevnikov S. V. Keller T. Khaydukov Yu. N. Ott F. Radu F. 《Journal of Experimental and Theoretical Physics》2019,128(4):504-513
Journal of Experimental and Theoretical Physics - The propagation of neutrons in the middle layer of a planar waveguide, which is a three-layer thin film, has been studied. Neutrons emitted from... 相似文献
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Keqian Zhang Jianguo Xiao Lian Gong 《International Journal of Infrared and Millimeter Waves》1998,19(9):1275-1284
The propagation characteristics of a planar waveguide with chiral media filled in the cladding are presented. The effect of chirality on cutoff, dispersion and field distribution of the waveguide are studied. The results show that the cladding chirality may lead to a single-mode operation in the planar waveguide. 相似文献
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Emil S. Koteles 《Fiber and Integrated Optics》1999,18(4):211-244
A review is presented of state-of-the-art optical planar waveguide demultiplexers (DEMUXes), that is, phasars (arrayed waveguide) and etched grating devices designed for high-density (narrow channel spacing) wavelength division multiplexing (WDM) systems. Their advantages and disadvantages are discussed in comparison with other techniques for demultiplexing WDM signals. The advances made in their performance are reviewed, and ultimate limitations, set by technological constraints, are proposed. Finally, a comparison is made of the advantages and disadvantages of etched grating as opposed to phasar planar waveguide DEMUXes. 相似文献
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用转移矩阵法数值分析了芯区和衬底为非线性介质、覆盖层为线性介质结构平面光波导的传播特性,包括TM的模场分布和功率与有效折射率之间关系的分析.解析地表达了模式本征方程和功率分布,对非线性介质中电场强度与介质非线性系数的关系进行了研究.计算结果表明,TM的模场分布和功率与有效折射率及介质的非线性系数有关. 相似文献
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平板波导谐振腔的耦合损失和模式特征 总被引:1,自引:1,他引:1
相应于方波导或圆波导的三种低耦合损失的谐振腔结构,即平行平面、半共心、半共焦结构、计算了不同纵横比的平板波导内各种模式的耦合损失,讨论了平板波导激光器谐振腔的设计和模式特征。 相似文献
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