简介：以六偏磷酸钠为稳定剂,采用硝酸镉和硫化钠合成了硫化镉纳米颗粒,利用层-层组装技术制备了聚电解质与硫化镉胶体的复合薄膜.吸收光谱显示,硫化镉胶体的吸收带边相对其体相有明显蓝移,并可观察到激子吸收峰,显示出量子尺寸效应.复合薄膜的荧光光谱上出现2个发光带,随着薄膜的组装层数的增加,复合薄膜的带带跃迁发光和表面态发光都相应减弱.

简介：Non-uniformstep-sizedistributionisimplementedforsplit-stepbasednonlinearcompensationinsingle-channel112-Gb/s16quadratureamplitudemodulation(QAM)transmission.Numericalsimulationsofthesystemincludinga20×80kmuncompensatedlinkareperformedusinglogarithmicstepsizedistributiontocompensatesignaldistortions.50%ofreductioninnumberofstepswithrespecttousingconstantstepsizesisobserved.Theperformanceisfurtherimprovedbyoptimizingnonlinearcalculatingposition(NLCP)incaseofusingconstantstepsizeswhileNLCPoptimizationbecomesunnecessarywhenusinglogarithmicstepsizes,whichreducesthecomputationaleffortduetouniformlydistributednonlinearphaseforallsuccessivesteps.

简介：利用MOCVD技术，分别在图形化蓝宝石衬底（PSS）、沉积有AlN薄膜的图形化蓝宝石衬底（PSS-A）和经过选择性刻蚀掉部分AlN的AlN薄膜的图形化蓝宝石衬底（PSS-E）上外延生长GaN。在高倍金相显微镜下面观察了生长的表面形貌，利用AFM测量了外延片表面的粗糙度，对比分析了三种样品（002）面和（102）面XRD的FWHM，然后对三个样品切片，SEM观察了三种样品的剖面图，最终将三种样品衬底的外延片制备成相同产品，对比分析了样品的LED芯片的光电参数。

简介：ByusingPDM-OFDM-16QAMmodulation,all-Ramanamplification,coherentdetection,and7%forwarderrorcorrection(FEC)threshold,wesuccessfullydemonstrate63-Tb/s(368×183.3-Gb/s)signalover160-kmstandardsinglemodefiber(SSMF)transmissionintheC-andL-bandswith25-GHzchannelspacing.368opticalchannelswithbandwidthspacingof25GHzaregeneratedfrom16externalcavitylasersources.After160-kmSSMFtransmission,alltestedbiterrorrate(BER)areunder3.8×10-3,whichcanberecoveredby7%FECthreshold.Withineachchannel,weachievethespectralefficiencyof6.85bit/s/HzinC/Lband.