The sampled-grating distributed Bragg reflector(SGDBR) laser is a typical and important photonic integrated device,and has potential wide application to agile optical networks.A new dynamic model for this device has b...The sampled-grating distributed Bragg reflector(SGDBR) laser is a typical and important photonic integrated device,and has potential wide application to agile optical networks.A new dynamic model for this device has been developed,which combines the traveling-wave method for the active region and the transfer-matrix method for the passive sections into a single procedure.The behaviors of wave-length switching of the SGDBR laser,which include the transient spectrum and mode competition,have been studied in detail using this model.A new efficient way has been proposed to improve the wavelength switching performance only by increasing the coupling coefficients without changing the carrier density.展开更多
基金Supported by the National High Technology Research and Development Program of China (Grant No. 2006AA03Z427)State Key Development Program for Basic Research of China (Grant No. 2003CB314903)National Natural Science Foun-dation of China (Grant No. 60677024)
文摘The sampled-grating distributed Bragg reflector(SGDBR) laser is a typical and important photonic integrated device,and has potential wide application to agile optical networks.A new dynamic model for this device has been developed,which combines the traveling-wave method for the active region and the transfer-matrix method for the passive sections into a single procedure.The behaviors of wave-length switching of the SGDBR laser,which include the transient spectrum and mode competition,have been studied in detail using this model.A new efficient way has been proposed to improve the wavelength switching performance only by increasing the coupling coefficients without changing the carrier density.
文摘目的:运用安捷伦1260高效液相色谱仪,建立多波长切换技术,同时测定加味小柴胡胶囊中党参炔苷、甘草苷、黄芩苷、黄芩素含量的方法。方法:采用菲罗门ODS C18柱,以乙腈(流动相A)-0.1%磷酸水溶液为流动相体系,梯度洗脱(0~40分钟,乙腈20%~45%),流速1.0 m L/min,一般波长254 nm,检测波长在每个成分出峰的时间段内切换为该成分最大吸收波长。结果:甘草苷、党参炔苷、黄芩苷、黄芩素分别在0.05~0.75、0.042~0.63、0.80~12.0、0.04~0.60μg范围内线性关系良好。相关系数分别为0.9995、0.9992、0.9999和0.9997,平均加样回收率分别为100.31%、98.92%、101.06%、100.17%,RSD%分别为1.90、1.63、2.21、1.19。结论:本研究建立的方法稳定可靠,便于操作,可以解决党参炔苷因含量较低无法检测的问题。