新型全光纤可调光衰减器  

Novel fiber-typed variable optical attenuator

作　　者：李志全[1] 田秀仙[1] 王会波[1] 

机构地区：[1]燕山大学电气工程学院,河北秦皇岛066004

出　　处：《光学精密工程》2008年第8期1371-1376,共6页Optics and Precision Engineering

基　　金：国家自然科学基金资助项目(No.60377002)

摘　　要：研究了一种新型全光纤可调光衰减器,设计了耦合特性检测装置。基于耦合波理论,分析了衰减量与改变参量之间的关系,讨论了波长微损耗特性。实验结果表明,调节两光纤锥横向间距u可以实现衰减量的大幅度调节,衰减量接近30 dB;调节纵向耦合长度L可以实现衰减量的微调,衰减量可达37 dB;此可调光衰减器可以获得<0.2 dB的波长微损耗。利用此结构的衰减器能够较理想地削弱或控制光信号,在对气体进行浓度测量和组分识别时,利用波长微损耗特性能够确保气体浓度测量的可靠性和单值性。A novel variable optical attenuator was developed and a detecting device was designed for testing its coupling characteristics. Based on coupling theory, the relations between the attenuation and the changing parameters were analyzed and the wavelength minimloss was discussed. The experi mental results indicate that the attenuation can change sharply and approach to 30 dB through adjus ting the lateral displacement u of two tapered fibers, the attenuation can change slightly and reach 37 dB by adjusting the longitudinal coupling length L of two tapered fibers. And this variable optical attenuator can obtain the wavelength minim-loss less than 0.2 dB. By this new design structure, the light signal can be weakened or controlled ideally. The reliability and singleness can be guaranteed using its wavelength minim loss characteristic when the gas concentration measurement and identity are carried out.

关 键 词：可调光衰减器 锥形光纤 耦合 波长微损耗 衰减量 

分 类 号：TN253[电子电信—物理电子学]