An InP optical 90°hybrid based on a×4 MMI coupler with a deep ridged waveguide is designed and fabricated.The working principle of the 90°hybrid is systematically introduced.Three-dimensional beam ropag...An InP optical 90°hybrid based on a×4 MMI coupler with a deep ridged waveguide is designed and fabricated.The working principle of the 90°hybrid is systematically introduced.Three-dimensional beam ropagation method(3D BPM)is used to optimize the structure parameters of the 90°hybrid.The designed compact structure is demonatrated to have a low excess loss less than-0.15 dB,a high common mode rejection ratio better than 40 dB,and a low relative phase deviation less than±2.5°.The designed hybrid is manufactured on a sandwitched structure deposited on an InP substrate.The measured results show that the common mode rejection ratios are larger than 20 dB in a range from 1520 nm to 1580 nm.The phase deviations are less than±5°in a range from 1545 nm to 1560 nm and less than±7°across the C band.The designed 90°optical hybrid is suitable well for realizing miniaturization,high-properties,and high bandwidth of coherent receiver.展开更多
在常用的微带两分支线电桥理论基础上,通过类似的奇偶模分析法对具备更宽工作频带的微带三分支线电桥进行了理论推导,得到了满足3 d B耦合条件时的各分支线特性阻抗计算公式。借助3D电磁场仿真软件HFSS,对理论计算初值进行了仿真优化,...在常用的微带两分支线电桥理论基础上,通过类似的奇偶模分析法对具备更宽工作频带的微带三分支线电桥进行了理论推导,得到了满足3 d B耦合条件时的各分支线特性阻抗计算公式。借助3D电磁场仿真软件HFSS,对理论计算初值进行了仿真优化,最终得到工作带宽可覆盖整个Ku频段（12~18 GHz）的微带三分支线3 d B电桥。采用该3 d B电桥背靠背地将2只功放管合成,在13~17 GHz频段内实现了输出功率高于35 W的宽带功率合成放大器。展开更多
基金Project supported by the National Key Research and Development Program of China(Grant No.2016YFB0402404)the Beijing Natural Science Foundation,China(Grant No.4194093)the National Natural Science Foundation of China(Grant Nos.61635010,61674136,and 61435002).
文摘An InP optical 90°hybrid based on a×4 MMI coupler with a deep ridged waveguide is designed and fabricated.The working principle of the 90°hybrid is systematically introduced.Three-dimensional beam ropagation method(3D BPM)is used to optimize the structure parameters of the 90°hybrid.The designed compact structure is demonatrated to have a low excess loss less than-0.15 dB,a high common mode rejection ratio better than 40 dB,and a low relative phase deviation less than±2.5°.The designed hybrid is manufactured on a sandwitched structure deposited on an InP substrate.The measured results show that the common mode rejection ratios are larger than 20 dB in a range from 1520 nm to 1580 nm.The phase deviations are less than±5°in a range from 1545 nm to 1560 nm and less than±7°across the C band.The designed 90°optical hybrid is suitable well for realizing miniaturization,high-properties,and high bandwidth of coherent receiver.
文摘在常用的微带两分支线电桥理论基础上,通过类似的奇偶模分析法对具备更宽工作频带的微带三分支线电桥进行了理论推导,得到了满足3 d B耦合条件时的各分支线特性阻抗计算公式。借助3D电磁场仿真软件HFSS,对理论计算初值进行了仿真优化,最终得到工作带宽可覆盖整个Ku频段（12~18 GHz）的微带三分支线3 d B电桥。采用该3 d B电桥背靠背地将2只功放管合成,在13~17 GHz频段内实现了输出功率高于35 W的宽带功率合成放大器。
