The power consumption of a variable optical attenuator（VOA） array based on a silica planar lightwave circuit was investigated. The thermal field profile of the device was optimized using the finite-element analysis....The power consumption of a variable optical attenuator（VOA） array based on a silica planar lightwave circuit was investigated. The thermal field profile of the device was optimized using the finite-element analysis. The simulation results showed that the power consumption reduces as the depth of the heat-insulating grooves is deeper, the up-cladding is thinner,the down-cladding is thicker, and the width of the cladding ridge is narrower. The materials component and thickness of the electrodes were also optimized to guarantee the driving voltage under 5 V. The power consumption was successfully reduced to as low as 155 mW at an attenuation of 30 dB in the experiment.展开更多
Silica-based planar lightwave circuit(PLC)devices can reduce transmission loss and cost in a quantum key distribution(QKD)system,and have potential applications in integration and production.A PLC-based quantum decodi...Silica-based planar lightwave circuit(PLC)devices can reduce transmission loss and cost in a quantum key distribution(QKD)system,and have potential applications in integration and production.A PLC-based quantum decoding integrated chip for multi-protocols is designed and fabricated,which is composed of variable optical splitters(VOSs),asymmetric Mach-Zehnder interferometers(AMZIs),and variable directional couplers(VDCs).Balanced pulse-pairs of four outputs are obtained simultaneously with measured delay times of 405 ps and 402 ps,respectively.The chip has advantages in achieving high interference visibility and low quantum bit error rate(QBER).展开更多
A simple WDM Add-Drop Multiplexer (ADM) Consisting of a set of Er-doped fibers (EDF) and a shared pump is proposed. The chief benefit of the module is that the interchannel power spread does not accumulate from stage ...A simple WDM Add-Drop Multiplexer (ADM) Consisting of a set of Er-doped fibers (EDF) and a shared pump is proposed. The chief benefit of the module is that the interchannel power spread does not accumulate from stage to stage in a cascaded WDM system. Moreover, the power differences caused by different component losses existing in the WDM networks can be automatically compressed. The cost will not increase a lot since the pump source is shared in the module. The performance of a cascaded system constructed from the modules has been carefully studied by computer simulation.展开更多
This paper addresses interactions of lightwave with microwave, and is divided into two parts. In part one, the background and the main topics of the research filed are introduced. In part two, some research activitie...This paper addresses interactions of lightwave with microwave, and is divided into two parts. In part one, the background and the main topics of the research filed are introduced. In part two, some research activities at Shanghai University are reviewed. These include optical control of microwave devices, photoinduced electromagnetic radiation, lightwave interaction with superconductors, microwave control of lightwave, and the microwave approach to highly irregular fiber optics.展开更多
前不久，Microsoft推出了新游戏「Age Of Mythology」，它的片头动画效果甚有气势。这个片头的制作主要使用的三维软件是Maya和Lightwave,Maya主要完成角色动画与动力学计算，Lightwave主要完成最终渲染与粒子效果。下面笔者就对其工作...前不久，Microsoft推出了新游戏「Age Of Mythology」，它的片头动画效果甚有气势。这个片头的制作主要使用的三维软件是Maya和Lightwave,Maya主要完成角色动画与动力学计算，Lightwave主要完成最终渲染与粒子效果。下面笔者就对其工作流程做一个简单介绍。展开更多
基金Project supported by the National High Technology Research and Development Program of China(Grant No.2015AA016902)the National Nature Science Foundation of China(Grant Nos.61435013,61405188,and 61627820)
文摘The power consumption of a variable optical attenuator（VOA） array based on a silica planar lightwave circuit was investigated. The thermal field profile of the device was optimized using the finite-element analysis. The simulation results showed that the power consumption reduces as the depth of the heat-insulating grooves is deeper, the up-cladding is thinner,the down-cladding is thicker, and the width of the cladding ridge is narrower. The materials component and thickness of the electrodes were also optimized to guarantee the driving voltage under 5 V. The power consumption was successfully reduced to as low as 155 mW at an attenuation of 30 dB in the experiment.
基金Project supported by the National Key Research and Development Program of China(Grant No.2018YFA0306403)the National Nature Science Foundation of China(Grant No.61805232).
文摘Silica-based planar lightwave circuit(PLC)devices can reduce transmission loss and cost in a quantum key distribution(QKD)system,and have potential applications in integration and production.A PLC-based quantum decoding integrated chip for multi-protocols is designed and fabricated,which is composed of variable optical splitters(VOSs),asymmetric Mach-Zehnder interferometers(AMZIs),and variable directional couplers(VDCs).Balanced pulse-pairs of four outputs are obtained simultaneously with measured delay times of 405 ps and 402 ps,respectively.The chip has advantages in achieving high interference visibility and low quantum bit error rate(QBER).
基金Supported by State Science and Technology Commission of China
文摘A simple WDM Add-Drop Multiplexer (ADM) Consisting of a set of Er-doped fibers (EDF) and a shared pump is proposed. The chief benefit of the module is that the interchannel power spread does not accumulate from stage to stage in a cascaded WDM system. Moreover, the power differences caused by different component losses existing in the WDM networks can be automatically compressed. The cost will not increase a lot since the pump source is shared in the module. The performance of a cascaded system constructed from the modules has been carefully studied by computer simulation.
文摘This paper addresses interactions of lightwave with microwave, and is divided into two parts. In part one, the background and the main topics of the research filed are introduced. In part two, some research activities at Shanghai University are reviewed. These include optical control of microwave devices, photoinduced electromagnetic radiation, lightwave interaction with superconductors, microwave control of lightwave, and the microwave approach to highly irregular fiber optics.
