首页>
外国专利>
OPTICAL VARIABLE ATTENUATOR, OPTICAL VARIABLE ATTENUATOR ARRAY, AND OPTICAL CIRCUIT USING THEM, AND METHOD OF CONTROLLING OPTICAL VARIABLE ATTENUATOR
OPTICAL VARIABLE ATTENUATOR, OPTICAL VARIABLE ATTENUATOR ARRAY, AND OPTICAL CIRCUIT USING THEM, AND METHOD OF CONTROLLING OPTICAL VARIABLE ATTENUATOR
展开▼
机译：光学可变衰减器，光学可变衰减器阵列以及使用它们的光学电路以及控制光学可变衰减器的方法
展开▼
页面导航
摘要
著录项
相似文献
摘要
PROBLEM TO BE SOLVED: To provide an optical variable attenuator which consumes always constant electric power even when the attenuation ratio is fluctuated and a method of controlling the same.;SOLUTION: The optical variable attenuator is constructed by connecting a symmetric MZI (Mach Zehnder interferometer) part 108 and asymmetric MZI part 109 in series by using output waveguides 107a, b, cross ports of the respective MZI parts, as output waveguides, and by setting a sum of optical path differences of the symmetric MZI part 108 and the asymmetric MZI part 109 to λ/2+Mλ wherein λ represents a wavelength of signal light and M is an integer. Further, whatever the attenuation ratio is , current to be fed through thin film heaters 104a, b is controlled so as to make a sum of phase change amounts of the symmetric MZI part 108 and the asymmetric MZI part 109 always π.;COPYRIGHT: (C)2005,JPO&NCIPI
展开▼
