共查询到20条相似文献,搜索用时 140 毫秒
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提出了基于热光型聚合物的集成有S弯曲光衰减器的1×4 Y分叉数字光开关. 利用开关与光纤阵列耦合用的S弯曲,将其设计成可变光衰减器,这使得器件更紧凑,并获得低串扰和大分叉角. 在小于200mW的驱动功耗下,器件串扰可低至-35dB. 相似文献
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低串扰Y分叉1×2热光型数字光开关 总被引:5,自引:5,他引:0
设计了一种基于聚合物材料热光效应的1×2数字光开关(DOS)新结构。该结构将Y分叉DOS与具有引导和可变光衰减(VOA)功能的S弯曲过渡波导集成,在不增加器件结构的基础上,可大大提高开关性能,并采用填埋尖角的方法改进设计Y分叉,增大了Y分叉角度的范围,降低了工艺难度。由光束传输法(BPM)模拟表明,对于波长为1.55μm、Y分叉角度α=0.3°和计算功耗为120 mW时,该结构可实现低于-40 dB的串扰,插入损耗小于0.5 dB,具有很好的极化独立性和波谱平坦性、良好的稳定性和可重复性以及易于集成等特点。 相似文献
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非对称Y分支波导结构的理论分析 总被引:2,自引:0,他引:2
对非对称Y分支进行了理论分析和计算。求解五层非对称波导正交模式,将之与波导模式结合,对两种不同形状的非对称Y分支串扰特性进行了定量分析,其结果与BPM软件模拟结果符合相当好。这种理论形式简单,应用范围大。 相似文献
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应用保角变换法、镜像法、耦合模理论和电光调制理论设计了一种推挽电极聚合物脊形波导定向耦合电光开关,阐述了基本结构和工作原理,给出了器件的设计和优化过程,主要分析了耦合长度、开关电压、输出光功率、插入损耗、串扰等特性. 为了实现正常的开关功能,讨论了制作公差、波谱漂移以及单模光纤耦合损耗对器件性能的影响. 模拟结果表明,所设计的开关的耦合长度为3082μm,开关电压为2.14V;插入损耗小于1.14dB,串扰小于-30dB. 与BPM仿真结果以及实验结果的对比表明,文中提出的波导和电极的理论分析与计算方法具有较高的精度和可行性. 相似文献
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应用保角变换法、镜像法、耦合模理论和电光调制理论设计了一种推挽电极聚合物脊形波导定向耦合电光开关,阐述了基本结构和工作原理,给出了器件的设计和优化过程,主要分析了耦合长度、开关电压、输出光功率、插入损耗、串扰等特性.为了实现正常的开关功能,讨论了制作公差、波谱漂移以及单模光纤耦合损耗对器件性能的影响.模拟结果表明,所设计的开关的耦合长度为3082μm,开关电压为2.14V;插入损耗小于1.14dB,串扰小于-30dB.与BPM仿真结果以及实验结果的对比表明,文中提出的波导和电极的理论分析与计算方法具有较高的精度和可行性. 相似文献
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Polymeric digital optical modulator based on asymmetric branch 总被引:2,自引:0,他引:2
A digital optical modulator based on an asymmetric Y-branch waveguide is proposed and fabricated by using an electro-optic polymer. The operating point is initially shifted to the off-state utilising the asymmetry in the branch to provide an initial zero-state with no electrical bias. It has been confirmed that the high extinction ratio can be obtained with a low drive voltage. An extinction ratio of 25 dB is demonstrated for a drive voltage of 20V using a polymer PMMA-DR1 with rss of 5 pm/V at 1.3 μm 相似文献
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The optimisation of X-cut LiNbO/sub 3/ BOA switches for low voltage, low insertion loss operation is described. An LiNbO/sub 3/ waveguide switch operating at 1.3 mu m with an insertion loss of 4.3 dB, switching voltage of 4.7 V and extinction ratio of 21 dB is reported.<> 相似文献
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Krahenbuhl R. Howerton M.M. Dubinger J. Greenblatt A.S. 《Lightwave Technology, Journal of》2002,20(1):92-99
High-performance Y-branch digital optical switches realized in Ti:LiNbO3 are presented. Their switching response functions have been optimized in terms of switch voltage and crosstalk ratio. The optimization is based on analyzing different types of waveguide shaping and switching arrangements using coupled mode theory and computer simulations. Excellent switching characteristics are achieved with devices exploiting a specially shaped waveguide branch in a dilated switch arrangement. Demonstrated performances include switching voltage as low as 9 V with crosstalk suppression better than 45 dB and fiber-to-fiber losses as low as 4 dB. Polarization independence with crosstalk suppression better than 40 dB over a 1520- to 1570-nm wavelength range is achieved for any applied switch voltage greater than 18 V. These optimized digital optical switches have further demonstrated the capability to reshape electrical input signals at switching rates of several hundred megahertz 相似文献
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A 32×32 optical switch matrix with a banyan network architecture is demonstrated using a Ti:LiNbO3 waveguide. The switching voltage was 24 V and extinction ratio averaged -18 dB. The prototype device showed path dependent insertion loss deviation of 10 dB. The device can be used as a building block for many functional optical switch matrices 相似文献
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Bigan E. Harmand J.C. Allovon M. Carre M. Carenco A. Voisin P. 《Photonics Technology Letters, IEEE》1991,3(12):1107-1109
The authors present an optical waveguide modulator structure based on Wannier-Stark localization in a InGaAs-InAlAs superlattice. Optical waveguide transmission below the superlattice bandgap displays expected F -1 oscillatory behavior leading to various modulation schemes. An 11 dB extinction ratio was obtained by applying a 0.7 V drive voltage to a 100 μm long waveguide device operating at 1.55 μm under a transverse-electric (TE)-polarization mode. On-state attenuation was 5 dB. Lower open-state attenuation (3 dB) can be obtained simultaneously with a higher extinction ratio (13 dB) but in that case a larger drive voltage (1.6 V) is needed 相似文献
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Stohr A. Humbach O. Hulsewede R. Wiersch A. Jager D. 《Photonics Technology Letters, IEEE》1994,6(7):828-830
A novel optical waveguide switch containing InGaAs/GaAs multiple-quantum wells (MQW) is proposed. In this structure, a large field-induced refractive index increase (0.1%) due to the quantum-confined Stark effect (QCSE) is utilized to generate electrically controllable waveguides. Switching operation of a first fabricated device has been investigated at wavelengths of about 1 μm. A crosstalk ratio of -18.8 dB and an extinction ratio of 20.9 dB was achieved at a reverse voltage of -7 V. Within an operational wavelength region of 9 nm, crosstalk was found to be less than -13 dB for both switching conditions. Further, the proposed switch structure seems to be well suited for monolithic integration with laser diodes and exhibits the potential for high-speed operation 相似文献
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Baojun Li Soo-Jin Chua 《Photonics Technology Letters, IEEE》2001,13(3):206-208
Based on the total internal reflection and the plasma dispersion effect of SiGe alloy, a 2×2 intersectional rib optical waveguide switch with bow-tie electrode has been proposed and fabricated for the wavelength of 1.3-μm operation. The thickness of the SiGe layer is 2.6 μm and the width is 9 μm. The branch angle of the switch is 2° and the bow-tie angle is 1.5°. The on-state crosstalk is -19.6 dB, the off-state extinction ratio is 38.5 dB and the off-state insertion loss is less than 1.70 dB. The switching time is about 180 ns 相似文献
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By careful design of the Y-junctions and bends of a Ti-diffused LiNbO3 branched waveguide modulator, an efficient intensity modulator has been realised. The halfwave voltage is 2.0 V, the extinction ratio is ?18 dB and the loss between the input and output channel waveguides is approximately 5 dB at 0.633 ?m. 相似文献