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Superluminescent diode integrated with monitor photodiode
Zhou Shuai,Liu Kun,Li Peng,Pang Fu-Bin,Zhang Jing,Kong Xiang-Ping,Duan Li-Hua,Zhang Chang-Chun 한국물리학회 2023 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.82 No.2
Ridge-waveguide superluminescent diodes with integrated rear-side monitoring photodiode have been fabricated. When electrical isolation trench is not etched to active layer, the leakage current of monitoring photodiode is determined by the resistance between active region electrode and monitoring photodiode electrode, i.e. the resistance multiplied by the leakage current approximately equals to 0.8 V. In order to reduce the leakage current of monitoring photodiode, the electrical isolation trench must be etched into substrate layer. In addition, the electrical isolation trench has to be far enough away from the active region so that the superluminescent diode could achieve small spectral ripple.
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Jingfeng Wang,Wanqian Wang,Shuai Pang,Bo Yu 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.5
In order to satisfy the requirements of seismic capacity of cold-formed thin-walled steel structure in low- and multi-rise buildings, an innovative cold-formed thin-walled steel tube truss (CFSTT) shear wall sheathed with both-side oriented strand board (OSB) was proposed in this paper. Five full-scale specimens of CFSTT shear walls which composed of square cold-formed thin-walled steel tubes, tracks, galvanized V-shaped connectors and OSB panels were tested under low-cyclic loading. The seismic performance of CFSTT shear wall was evaluated in terms of hysteretic behavior, envelop curves, ductility and energy dissipation, etc. Then, a practical nonlinear simplifi ed analysis method of CFSTT shear walls under low-cyclic reversed lateral loading was proposed based on the principle of equivalent tie rod model. The double- and fourlimb lattice studs were also simplifi ed as single steel tubes. Besides, a pivot modeling approach was suggested to stimulate the sheathing-to-frame connection. Subsequently, the fi nite element models of CFSTT shear walls were established based on this simplifi ed method and verifi ed by the experimental data. Numerical and experimental results indicated that CFSTT shear walls exhibited excellent seismic performance, and the accuracy of the simplifi ed of lattice stud was verifi ed. Furthermore, the simplifi ed method proposed in this paper will highly facilitate conducting the nonlinear analysis for shear walls.
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