A rearrangeable nonblocking thermo-optic 4×4 switching matrix,which consists of five 2×2 multimode interference-based Mach-Zehnder interferometer(MMI-MZI) switch elements,is designed and fabricated.The minim...A rearrangeable nonblocking thermo-optic 4×4 switching matrix,which consists of five 2×2 multimode interference-based Mach-Zehnder interferometer(MMI-MZI) switch elements,is designed and fabricated.The minimum and maximum excess loss for the matrix are 6.6 and 10.4dB,respectively.The crosstalk in the matrix is measured to be between -12 and -19.8dB.The switching speed of the matrix is less than 30μs.The power consumption for the single switch element is about 330mW.展开更多
采用上流有限元法定量分析了离子迁移率和离子复合率对±800 k V特高压直流输电线路地面合成场强和离子流密度的影响。结果表明,离子迁移率对地面合成场强影响不大,而地面离子流密度随着迁移率的增大呈线性变化;两者均随离子复合率...采用上流有限元法定量分析了离子迁移率和离子复合率对±800 k V特高压直流输电线路地面合成场强和离子流密度的影响。结果表明,离子迁移率对地面合成场强影响不大,而地面离子流密度随着迁移率的增大呈线性变化;两者均随离子复合率的增大而减小,且复合率对地面离子流密度计算的影响大于对地面合成场强的影响。展开更多
从母国制度成本入手,将OFDI(Outward Foreign Direct Investment)投资动机、反向溢出理论与制度成本纳入到统一的分析框架内,探讨制度成本对OFDI投资动机、反向溢出的具体影响机制与效应.采用中国省级面板数据实证研究发现:在控制地区...从母国制度成本入手,将OFDI(Outward Foreign Direct Investment)投资动机、反向溢出理论与制度成本纳入到统一的分析框架内,探讨制度成本对OFDI投资动机、反向溢出的具体影响机制与效应.采用中国省级面板数据实证研究发现:在控制地区市场化程度之后,OFDI对母国的贸易效应不再为正,而是转为显著的负面效应;OFDI对母国的反向溢出及其贸易效应具有显著的"制度门槛"特征;OFDI对母国的贸易效应依赖于母国制度环境,地区市场化程度越高,OFDI对地区贸易的促进效应越强.降低制度成本对于促进对外开放与国内经贸的良性互动至关重要.展开更多
To improve the output characteristics of all-fiber Mach-Zehnder interferometer(MZI)-interleaver,a dual microring-assisted MZI interleaver is designed.According to its structure,the output expression of the device is d...To improve the output characteristics of all-fiber Mach-Zehnder interferometer(MZI)-interleaver,a dual microring-assisted MZI interleaver is designed.According to its structure,the output expression of the device is derived from the signal flow diagram.After simulation analysis,the optimal structural parameters during the transmission process are obtained.In addition,the coupling coefficient and transmission loss of the coupler are analyzed.The results show that the improved interleaver output line wave is closer to the square wave,and its 25 dB cutoff band bandwidth and 0.5 dB passband bandwidth are significantly improved,with the values of 41.2 GHz and 18.9 GHz,respectively.The device has a certain resistantability to deviation,and the transmission loss has less influence on the extinction characteristics of the filter.展开更多
文摘A rearrangeable nonblocking thermo-optic 4×4 switching matrix,which consists of five 2×2 multimode interference-based Mach-Zehnder interferometer(MMI-MZI) switch elements,is designed and fabricated.The minimum and maximum excess loss for the matrix are 6.6 and 10.4dB,respectively.The crosstalk in the matrix is measured to be between -12 and -19.8dB.The switching speed of the matrix is less than 30μs.The power consumption for the single switch element is about 330mW.
文摘从母国制度成本入手,将OFDI(Outward Foreign Direct Investment)投资动机、反向溢出理论与制度成本纳入到统一的分析框架内,探讨制度成本对OFDI投资动机、反向溢出的具体影响机制与效应.采用中国省级面板数据实证研究发现:在控制地区市场化程度之后,OFDI对母国的贸易效应不再为正,而是转为显著的负面效应;OFDI对母国的反向溢出及其贸易效应具有显著的"制度门槛"特征;OFDI对母国的贸易效应依赖于母国制度环境,地区市场化程度越高,OFDI对地区贸易的促进效应越强.降低制度成本对于促进对外开放与国内经贸的良性互动至关重要.
基金National Natural Science Foundation of China(No.61461024)Foundation of a Hundred Youth Talent Training Program of Lanzhou Jiaotong University(No.1520220232)。
文摘To improve the output characteristics of all-fiber Mach-Zehnder interferometer(MZI)-interleaver,a dual microring-assisted MZI interleaver is designed.According to its structure,the output expression of the device is derived from the signal flow diagram.After simulation analysis,the optimal structural parameters during the transmission process are obtained.In addition,the coupling coefficient and transmission loss of the coupler are analyzed.The results show that the improved interleaver output line wave is closer to the square wave,and its 25 dB cutoff band bandwidth and 0.5 dB passband bandwidth are significantly improved,with the values of 41.2 GHz and 18.9 GHz,respectively.The device has a certain resistantability to deviation,and the transmission loss has less influence on the extinction characteristics of the filter.
