3×3光纤耦合器解调方法  

Demodulation Method Based on The 3×3 Optical Fiber Coupler

作　　者：张晓峻[1] 康崇[1] 孙晶华[1] 

机构地区：[1]哈尔滨工程大学理学院,黑龙江哈尔滨150001

出　　处：《发光学报》2013年第5期665-671,共7页Chinese Journal of Luminescence

基　　金：国家自然科学基金(61174192)资助项目

摘　　要：介绍了3×3光纤耦合器输出解调方法的原理,推导出了3×3光纤耦合器输出解调信号的数学表达式,给出了3×3光纤耦合器输出解调算法的解调频率范围,分析了外界干扰信号、耦合器的不对称性、以及信号中存在高次谐波对解调结果的影响。分析结果表明:该方法有比较宽的频率解调范围,能够克服温度变化等外界因素的干扰,能够消除3×3耦合器3个输出端存的偏差对解调结果的影响以及在信号中存在高次谐波的影响。该方法具有性能稳定、不需要载波、不需要稳定的工作点以及抗干扰能力强等优点,具有较强的实用性和可行性,对解调电路的数字化设计具有理论指导意义。The principle of 3×3 fiber coupler output demodulation is introduced,and its mathematical expression is derived.The demodulation frequency range of its algorithm is exploited.The effects from interference signals,asymmetry of coupler and higher harmonic on demodulation result are analyzed.The results show that this method has a wide range of frequency demodulation,and can avoid the interference of outside factors such as temperature,and eliminate the effects which are from deviation of three output sides of 3×3 coupler on demodulation and higher harmonic.It has advantages of stable performance,carrier and stable working point not needed,and strong anti-jamming capability,etc.So it has well practicability,feasibility and theoretical guidance meaning for digital demodulation circuit design.

关 键 词：光纤传感器 3×3耦合器 干涉仪 信号 解调 

分 类 号：TN929.11[电子电信—通信与信息系统]