Project supported by the National Natural Science Foundation of China(Nos.60776051,60376033);the Beijing Municipal Natural Science Foundation of China(No.4082007);the Beijing Municipal Education Committee of China(Nos.KM200910005001, KM200710005015).
A novel cascaded DFB laser,which consists of two serial gratings to provide selectable wavelengths,is presented and analyzed by the transfer matrix method.In this method,efficient facet reflectivity is derived from th...
National Natural Science Foundation of China (60776051 and 60376033);Beijing Municipal Natural Science Foun-dation,China (4082007);State 973 project, Beijing Municipal Education Committee,China (KM200710005015);Beijing Municipaltrans -century Talent Project (67002013200301);Young Science Foundation of BJUT (97002013200701);Ph.D Start Science Foundation of BJUT(52002013200701);the 6th Science and Technology Postgraduate Foundation of BJUT(ykj -2007-1970)
A multi-finger power SiGe heterojunction bipolar transistor (HBT) with non-uniform finger spacing was fabricated to improve thermal stability. Experimental results show that the peak temperature is reduced by 22K co...