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量子点半导体光放大器(QD-SOA)具有皮秒级的增益恢复时间和超快的载流子浓度恢复等特点,光子晶体(PC)与QD-SOA结合后具有强非线性效应、低吸收损耗、高功率传输和低功耗等优点。研究了光子晶体-量子点半导体光放大器(PC-QDSOA)的波长转换特性,详细分析了最大模式增益、泵浦光功率、探测光功率、有源区长度对PC-QDSOA波长转换Q因子的影响及注入电流、泵浦光功率、探测光功率、有源区长度与PC-QDSOA波长转换消光比的关系,并将PC-QDSOA仿真结果与QD-SOA的仿真结果进行比较。结果显示PC-QDSOA的Q因子和消光比的数值总是大于QD-SOA,说明PC-QDSOA比QD-SOA的输出信号质量更好,信号传输效率更高,转换性能更优越。研究结果对PC-QDSOA的应用具有一定的指导意义。 相似文献
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We revisit hidden-charm pentaquark states P_c(4380) and P_c(4450) using the method of QCD sum rules by requiring the pole contribution to be greater than or equal to 30% in order to better that the one-pole parametrization is valid. We find two mixing currents, and our results suggest that P_c(4380) and P_c(4450) can be identified as hiddencharm pentaquark states having J~P= 3/2~-and 5/2~+, respectively. However, there still exist other possible spin-parity assignments, such as J~P = 3/2~+ and J~P = 5/2~-, which must be clarified in further theoretical and experimental studies. 相似文献
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