一种基于3×3耦合器构造干涉仪的被动解调新方法  

A Novel Passive Demodulator for Fiber Optic Interferometer with 3×3 Coupler

作　　者：洪广伟[1] 贾波[1] 华中一[1] 

机构地区：[1]复旦大学光纤研究中心,上海200433

出　　处：《仪器仪表学报》2006年第4期341-344,362,共5页Chinese Journal of Scientific Instrument

基　　金：上海科学技术发展基金(012261037)资助项目

摘　　要：提出一种基于3×3耦合器干涉信号的全新被动解调方案,方案基于简单的数学运算,利用2路干涉信号,消除了单路信号的不灵敏区,不需要校准。与相位生成载波技术(PGC)和过去基于3×3耦合器的解调方案相比,不需要载波、滤波器,不需要3×3耦合器有严格的分光比,而且更加具有实用性。最后通过使用稳定化光源和采样率满足fs Aω情况下的测速实验,验证了方案的正确性和可行性。A novel passive algorithm for demodulating the phase shift in the fiber optic interferometric systems based on the 3×3 coupler was developed. By employing two output signals, it can eliminate the insensitive areas. It employs a very simplified formula. As compared to the PGC （phase generated carrier） technique and past 3×3 coupler-based demodulator, the method has no phase carrier, no filters, no calibration, no need for uniform splitting ratio of coupler. Through experiments＇ validation by using stable light source and fs〉〉Aω, the new demodulation method can be used in the fiber optic interferometric system.

关 键 词：光纤传感器 位解调器3×3光纤耦合器 全光纤速度干涉仪 

分 类 号：TN247[电子电信—物理电子学]