用光学相关识别方法测量单模光纤的折射率分布和色散

介绍了一种测量单模光纤剖面折射率分布和色散的新方法－－光学相关识别方法。应用计算全息制作高斯－拉盖尔模的匹配滤波器，根据光学相关识别原理测出单模光纤场分布的展开系数，由此推得剖面折射率分布和色散，给出了实际测量结果。     

Second—Harmonic and Third—Harmonic Generations in the Thue—Morse Dielectric Superlattice

Theoretical work on the optical properties of the one-dimensional dielectric superlattice is extended.By means of a transfer matrix method,the second-harmonic and third-harmonic generations in a one-dimensional finite Thue-Morse dielectric superlattice are analysed.The electric field amplitude variables of the second-harmonic and third-harmonic can be expressed by the formula of matrices.taking advantage of numerical procedure,we discuss the dependence of the second-harmonic and third-harmonic on the fundamental wavelength and the field amplitude variables of the fundamental wave.High conversion efficiency of the third-harmonic can be obtained at some special fundamental wavelength.     

缺陷态复周期光子晶体的特性研究

利用传输矩阵法计算复周期结构的光子晶体的色散关系和滤波特性 ,并重点研究了含有缺陷的类似于谐振腔结构的光子晶体滤波特性.由于这种缺陷态复周期结构的可调参数多,人们很容易得到在红外波段1550 nm附近窄带滤波窗口,透过率可达到近90%,而窗口以外的透过率在0.02%以下.当改变中间夹层厚度、周期数及缺陷层数时,窄带滤波窗口的位置和带宽发生改变.因此,它在高速,长距离光通信中将有很好的应用.