阐述了3 dB分支波导定向耦合器、波导—微带双探针过渡、改进型波导T型结的原理,介绍了一种4路功率分配/合成网络。提出了一种8路功率分配/合成器,其结构具有插入损耗低、输入驻波好、幅度相位一致性好等优点。研制了50 W Ka频段固态功...阐述了3 dB分支波导定向耦合器、波导—微带双探针过渡、改进型波导T型结的原理,介绍了一种4路功率分配/合成网络。提出了一种8路功率分配/合成器,其结构具有插入损耗低、输入驻波好、幅度相位一致性好等优点。研制了50 W Ka频段固态功率放大器,由驱动级放大器、8路功率分配/合成器和8个7 W功放模块组成,在29~31 GHz频率范围内实现了大于50 W的线性输出功率,合成效率高于80%。展开更多
A novel polarizer with a silver nanoribbon added into a traditional waveguide directional coupler is designed to realize the polarized output of TE mode.A high extinction ratio can be obtained because of the selectivi...A novel polarizer with a silver nanoribbon added into a traditional waveguide directional coupler is designed to realize the polarized output of TE mode.A high extinction ratio can be obtained because of the selectivity of surface plasmon polaritons(SPPs)on polarization.The effects of the polarizer parameters on coupling efficiency and extinction ratio are discussed.Simulation results indicate that the coupling efficiency for TE mode can reach about 95%,but only 3% for TM mode,with the extinction ratio of TE mode about 15 dB when the light wavelength is 1550 nm.The polarizer may have potential applications in photonic integrated circuits and quantum information technology.展开更多
Deeply etched rib waveguides on silicon on insulator platform were not addressed well in research publications. We have analyzed single mode condition and polarization independence of a deeply etched rib waveguide （D...Deeply etched rib waveguides on silicon on insulator platform were not addressed well in research publications. We have analyzed single mode condition and polarization independence of a deeply etched rib waveguide （DE-RW） structure from biosensing perspective. With this rib structure, an asymmetrically etched integrated optic directional coupler has been numerically modeled to have the same coupling length for quasi- TE and TM modes. The coupling coefficients with the glucose solution as an upper cladding were calculated using a full vector mode solver, and the bulk refractive index sensitivity of the sensor was found as 28.305 × 10^-2/RIU for a fundamental quasi-TE mode.展开更多
基金supported by the National Natural Science Foundation of China(Nos.60907003,61070040 and 61107005)the Program for New Century Excellent Talents in University
文摘A novel polarizer with a silver nanoribbon added into a traditional waveguide directional coupler is designed to realize the polarized output of TE mode.A high extinction ratio can be obtained because of the selectivity of surface plasmon polaritons(SPPs)on polarization.The effects of the polarizer parameters on coupling efficiency and extinction ratio are discussed.Simulation results indicate that the coupling efficiency for TE mode can reach about 95%,but only 3% for TM mode,with the extinction ratio of TE mode about 15 dB when the light wavelength is 1550 nm.The polarizer may have potential applications in photonic integrated circuits and quantum information technology.
文摘Deeply etched rib waveguides on silicon on insulator platform were not addressed well in research publications. We have analyzed single mode condition and polarization independence of a deeply etched rib waveguide （DE-RW） structure from biosensing perspective. With this rib structure, an asymmetrically etched integrated optic directional coupler has been numerically modeled to have the same coupling length for quasi- TE and TM modes. The coupling coefficients with the glucose solution as an upper cladding were calculated using a full vector mode solver, and the bulk refractive index sensitivity of the sensor was found as 28.305 × 10^-2/RIU for a fundamental quasi-TE mode.
