A novel and fast model of erbium-doped fiber amplifiers (EDFAs) is presented. By calculating a typical EDFA, numerical results are compared with the results obtained by spectral-solved method. The results of compariso...A novel and fast model of erbium-doped fiber amplifiers (EDFAs) is presented. By calculating a typical EDFA, numerical results are compared with the results obtained by spectral-solved method. The results of comparison show that such a model can improve the computational speed and preserve the precision. Some characteristics of the EDFA are then analyzed using this model. The results are consistent with those of the experiments.展开更多
An analysis solution of rate equation is derived for vertical cavity surface-emitting lasers. Based on the enhanced spontaneous emission caused by VCSELs and influence of nonradiative recombination, the relation betwe...An analysis solution of rate equation is derived for vertical cavity surface-emitting lasers. Based on the enhanced spontaneous emission caused by VCSELs and influence of nonradiative recombination, the relation between output properties and structural parameters of multi-quantum wells (MQWs) is obtained. It was found that the characteristic curve of a“thresholdless”laser is strongly nonradiative depopulation-dependent. When the nonradiative depopulation is no zero, the light-current characteristic is not linearly even for an ideal closed microcavity. The light output is increased by the enhanced well number and by the reduced width. In particular, a lower threshold current density for MQW structure in the short cavity is realized by us, meanwhile the sharpness of the variation depends on spontaneous emission factor.展开更多
为了深入研究复合生物净化槽内脱氮除磷的微生物种类及特性,以培养基为单位进行初筛、以脱氮除磷试验进行复筛,得到了3株优势菌株A-1、B-5、C-2。运用离子色谱法和营养液培养法综合分析菌株的脱氮除磷产物,并采用革兰氏染色法对菌株进...为了深入研究复合生物净化槽内脱氮除磷的微生物种类及特性,以培养基为单位进行初筛、以脱氮除磷试验进行复筛,得到了3株优势菌株A-1、B-5、C-2。运用离子色谱法和营养液培养法综合分析菌株的脱氮除磷产物,并采用革兰氏染色法对菌株进行初步判定,另外还建立了3种菌株的系统树,研究了3种菌株的基因序列。对菌株理化指标的分析表明,菌株A-1、B-5、C-2分别符合奇异变形杆菌、门多萨假单胞菌、枯草杆菌的特征;通过16S r DNA基因序列进行对比分析,发现3种菌株与上述对应菌种的同源性分别可达到99%、98%、98%。最后,运用Monod方程和Lineweaver-Burk图解法建立了3种菌株的反应速率方程式。展开更多
文摘A novel and fast model of erbium-doped fiber amplifiers (EDFAs) is presented. By calculating a typical EDFA, numerical results are compared with the results obtained by spectral-solved method. The results of comparison show that such a model can improve the computational speed and preserve the precision. Some characteristics of the EDFA are then analyzed using this model. The results are consistent with those of the experiments.
文摘An analysis solution of rate equation is derived for vertical cavity surface-emitting lasers. Based on the enhanced spontaneous emission caused by VCSELs and influence of nonradiative recombination, the relation between output properties and structural parameters of multi-quantum wells (MQWs) is obtained. It was found that the characteristic curve of a“thresholdless”laser is strongly nonradiative depopulation-dependent. When the nonradiative depopulation is no zero, the light-current characteristic is not linearly even for an ideal closed microcavity. The light output is increased by the enhanced well number and by the reduced width. In particular, a lower threshold current density for MQW structure in the short cavity is realized by us, meanwhile the sharpness of the variation depends on spontaneous emission factor.
文摘为了深入研究复合生物净化槽内脱氮除磷的微生物种类及特性,以培养基为单位进行初筛、以脱氮除磷试验进行复筛,得到了3株优势菌株A-1、B-5、C-2。运用离子色谱法和营养液培养法综合分析菌株的脱氮除磷产物,并采用革兰氏染色法对菌株进行初步判定,另外还建立了3种菌株的系统树,研究了3种菌株的基因序列。对菌株理化指标的分析表明,菌株A-1、B-5、C-2分别符合奇异变形杆菌、门多萨假单胞菌、枯草杆菌的特征;通过16S r DNA基因序列进行对比分析,发现3种菌株与上述对应菌种的同源性分别可达到99%、98%、98%。最后,运用Monod方程和Lineweaver-Burk图解法建立了3种菌株的反应速率方程式。
