摘要
传统光纤陀螺采用一个宽带光源和一个探测器,输入/输出共用Sagnac干涉仪的一个端口,这种结构构成一种互易性光路,使各种因素引起的两束光波之间的附加相移完全抵消,从而可以非常灵敏地测量旋转引起的Sagnac相移,而光子纠缠光纤陀螺通常采用双端口输入/双端口输出的光路结构,其光路互易性尚未充分认识。利用散射矩阵模型分析了非理想分束器的相位特性,理论推导了各种非经典输入态的二阶符合输出光强,在此基础上分析了光子纠缠光纤陀螺的光路互易性。研究表明,当输入态为对称Fock态|nn〉时,光子纠缠Sagnac干涉仪是一个互易性光路结构;当输入态为不对称Fock态|nm〉n≠m时,其是一个非互易性光路结构。而采用N00N态时,由于其输入态组合包含等概率|nm〉、|mn〉形式的非对称Fock态的叠加,仍是一个互易性光路结构。
The traditional fiber optic gyroscope adopts a broadband light source and a detector,and the input/output share one port of the Sagnac interferometer.This structure forms a reciprocal optical path,which completely cancels the additional phase shift between the two light waves caused by various factors,so that the Sagnac phase shift caused by rotation could be measured very sensitively.The photon entangled fiber optic gyroscope usually adopts the optical structure of two port input/two port output,and its optical reciprocity has not been fully understood.In this paper,the scattering matrix model is used to analyze the phase characteristics of non ideal beam splitter.The second-order coincidence output light intensity of various non classical input states is deduced theoretically.On this basis,the optical reciprocity of photon entangled fiber optic gyroscope is analyzed.The research shows that when the input state is symmetric Fock state|nn>,the photon entangled Sagnac interferometer is a reciprocal optical structure.When the input state is asymmetric Fock state|nm〉(n≠m),it is a non reciprocal optical structure.When using the N00 N state,it is still a reciprocity optical structure due to the input state combination contains the superposition of asymmetric Fock states|nm〉,|mn〉in the form of equal probability.
作者
张桂才
冯菁
马林
ZHANG Gui-cai;FENG Jing;MA Lin(Tianjin Navigation Instruments Research Institute,Tianjin 300131)
出处
《导航与控制》
2022年第1期92-98,共7页
Navigation and Control
关键词
光纤陀螺
光子纠缠
光路互易性
散射矩阵
fiber optic gyroscope
photon entanglement
optical reciprocity
scattering matrix
