基于单模光纤耦合器的Haar小波滤波器系数的实现  

Implementation of coefficient of Haar wavelet filter by single-mode-fiber coupler

作　　者：印勇[1] 谭勇[1] 田逢春[1] 

机构地区：[1]重庆大学通信工程学院,重庆400044

出　　处：《光学精密工程》2007年第3期417-421,共5页Optics and Precision Engineering

基　　金：国家自然科学基金资助项目(No.60472037)

摘　　要：给出了光波导式小波滤波器的设计方案,该方案采用单模光纤耦合器作为系数实现载体,通过控制特性参数实现了具有不同分光比的耦合器基本单元,然后组合和级联基本单元实现特定的小波滤波器系数,具有精确度高,集成度好,稳定性强的优势。分析了与系数实现相关的熔锥型单模光纤耦合器的形状特性,横截面沿纵向变化的锥形区和横截面近似不变的耦合区内的耦合特性,根据理论推导,用仿真手段设计3 dB单模光纤耦合器,实现了Haar小波的滤波器系数,误差在3%以内,证明了光波导式小波滤波器设计方案的正确性和有效性。A design of wavelet filter of waveguide is given using single-mode-fiber coupler as a basic unit to implement a coefficient. The couplers with various power divisions are designed, then, these couplers are combinated appropriately. Their solutions are proved to be accurate, integrated easily and parameter-stable. The geometry features relevant to coefficient implementation of fused single-modefiber coupler, the coupling behavior of the taper region with gradually changing cross section and the uniform coupling region are discussed. Finally, a 3 dB coupler is given to implement the coefficient of Haar wavelet transform filter successfully by simulation with an error less than 3%. This result verifies the correction and the effectiveness of the design.

关 键 词：光纤耦合器 光学小波 HAAR小波 

分 类 号：TH253[机械工程—机械制造及自动化] TN713[电子电信—电路与系统]