【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。更多还原

【Abstract】 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 f_sAω,the new demodulation method can be used in the fiber optic interferometric system.更多还原