Integrated optical power splitters are basic but indispensable on-chip devices in silicon photonics.They can be used either for power distribution or monitoring,or as the building blocks for more complex devices or ci...Integrated optical power splitters are basic but indispensable on-chip devices in silicon photonics.They can be used either for power distribution or monitoring,or as the building blocks for more complex devices or circuits.Although different types of optical power splitters with different architectures have been proposed and demonstrated,devices that could work with arbitrary power splitting ratio in a large bandwidth without polarization dependence are still rare to be seen.In this paper,we propose and investigate an optical power splitter with adiabatically tapered waveguide structures on a thick silicon nitride platform,which could meet the requirement mentioned above.With optimized structural parameters obtained by three-dimensional finite-difference time-domain(3D-FDTD)simulation,the polarization dependence of different power splitting ratio gets almost eliminated for each specific working wavelength.In a broad wavelength range(1340—1800 nm),the insertion loss(IL)of the device is below 1 d B,and the variation of the power splitting ratio(PSR)can be controlled within~±5%if compared with the targeted design value for 1550 nm centered wavelength.Simple structure,relaxed critical dimensions,and good fabrication tolerance make this device compatible with the standard fabrication process in commercial silicon photonic foundries.展开更多
根据径向波导的主模特性,提出了一种基于径向波导的空间功率合成系统和它的简化模型.利用HFSS(High Frequency Structure Simulator)软件,开发出了16路宽带空间功率合成电路和159W X波段放大器模块.结果发现,无源合成网络在整个X波段合...根据径向波导的主模特性,提出了一种基于径向波导的空间功率合成系统和它的简化模型.利用HFSS(High Frequency Structure Simulator)软件,开发出了16路宽带空间功率合成电路和159W X波段放大器模块.结果发现,无源合成网络在整个X波段合成效率都优于88%,放大器模块在其工作频率内(11.9GHz^12.3GHz),合成效率优于83%.展开更多
文摘针对移相器和功分器的功能融合设计,提出了一种基于慢波基片集成波导(Slow-Wave Substrate Integrated Waveguide,SW-SIW)的小型化移相功分器,两个输出分支等长带宽,可实现30°相移量.其中一个输出分支通过基片集成波导(Substrate Integrated Waveguide,SIW)实现,而另一个输出分支将互补开口谐振环(Complementary SplitRing Resonator,CSRR)加载在上层金属表面,代替传统SIW连续的金属表面,该CSRR由经典CSRR结构演变而来,同时为了降低由CSRR加载所造成的相位上的不稳定,在CSRR内部添加金属化通孔,实现SW-SIW,使得截止频率和相速度降低.测试结果表明,移相功分器在9.0~11.8 GHz频带范围内反射系数|S11|小于-10 d B,相对工作带宽为26.9%,插入损耗小于1.3 d B.两个输出端口的相位差稳定在30°±3°,幅度差小于1.4 d B,实现了等功率分配.所设计的移相功分器具有较小的尺寸和低制造成本,适合应用在相控阵天线中.
基金supported by the Fujian Provincial Department of Science and Technology(No.2022I0006)the Natural Science Foundation of Fujian Province(No.2020J01467)the National Natural Science Foundation of China(No.61405198)。
文摘Integrated optical power splitters are basic but indispensable on-chip devices in silicon photonics.They can be used either for power distribution or monitoring,or as the building blocks for more complex devices or circuits.Although different types of optical power splitters with different architectures have been proposed and demonstrated,devices that could work with arbitrary power splitting ratio in a large bandwidth without polarization dependence are still rare to be seen.In this paper,we propose and investigate an optical power splitter with adiabatically tapered waveguide structures on a thick silicon nitride platform,which could meet the requirement mentioned above.With optimized structural parameters obtained by three-dimensional finite-difference time-domain(3D-FDTD)simulation,the polarization dependence of different power splitting ratio gets almost eliminated for each specific working wavelength.In a broad wavelength range(1340—1800 nm),the insertion loss(IL)of the device is below 1 d B,and the variation of the power splitting ratio(PSR)can be controlled within~±5%if compared with the targeted design value for 1550 nm centered wavelength.Simple structure,relaxed critical dimensions,and good fabrication tolerance make this device compatible with the standard fabrication process in commercial silicon photonic foundries.
文摘根据径向波导的主模特性,提出了一种基于径向波导的空间功率合成系统和它的简化模型.利用HFSS(High Frequency Structure Simulator)软件,开发出了16路宽带空间功率合成电路和159W X波段放大器模块.结果发现,无源合成网络在整个X波段合成效率都优于88%,放大器模块在其工作频率内(11.9GHz^12.3GHz),合成效率优于83%.
