三段式带通型可调谐全光纤声光滤波器  

All-fiber acousto-optical tunable band pass filter with sandwich fiber structure

作　　者：金弢[1] 厉群[1] 程凯[1] 刘小明[1] 

机构地区：[1]清华大学电子工程系,北京100084

出　　处：《清华大学学报（自然科学版）》2002年第7期961-963,988,共4页Journal of Tsinghua University(Science and Technology)

摘　　要：为克服基于普通单模光纤的声光效应只能实现带阻滤波器的问题 ,提出并实现了一种三段式结构的全光纤带通型可调谐声光滤波器。该文分析了三段式结构实现带通滤波的原理 ,考虑声波的衰减而优化了第一段和第三段光纤的长度比 ,并且指出中间段光纤的长度对于滤波器消光比的影响。这种新型结构的滤波器与以往的全光纤滤波器相比 ,边带抑制比高 ,没有移频现象 。An all fiber acousto optical tunable band pass filter with a sandwich fiber structure was designed to overcome the band notch filter problem of fiber acousto optical filters based on single mode fibers. The paper describes the filter working principle, the influence of the middle section on signal extinction, and the analysis of the fiber section lengths. Compared to other all fiber filters, this filter has high sideband suppression but no frequency shift, so is appropriate for WDM (wavelength division multiplexing) system applications.

关 键 词：可调谐全光纤 波分复用系统 边带抑制比 声光滤波器 带通 三段式结构 单模光纤 

分 类 号：TN713.5[电子电信—电路与系统]