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为了克服伴生调幅对光源调频型相位生成载波(PGC)解调方法的影响,提出一种基于双路干涉信号和微分-交叉相乘(DCM,differential-cross multiply)的PGC解调方法。通过3×2耦合器引入双路干涉信号,直接调制光源频率获得相位载波。实验结果表明,新方法较好地消除了光源伴生调幅的影响。对于4 rad的解调信号,总谐波比提高20 dB以上,幅值偏差为0.08 rad,而单路干涉信号的DCM-PGC方法的偏差达0.33 rad。并且,新方法的信噪比和信纳比均有显著的改善。
In order to overcome the influence of the associated amplitude modulation on the demodulation method of the phase modulation carrier (PGC) of the light source, a PGC demodulation method based on two-way interference signals and differential-cross multiplication (DCM) is proposed. A 3 × 2 coupler is used to introduce a dual-channel interference signal to directly modulate the light source frequency to obtain a phase carrier. The experimental results show that the new method can better eliminate the influence of the amplitude modulation of the light source. For the 4 rad demodulated signal, the total harmonic ratio is increased by more than 20 dB and the amplitude deviation is 0.08 rad, while the deviation of the DCM-PGC method for a single interferometric signal reaches 0.33 rad. Moreover, the new method has a significant improvement in signal-noise ratio and SINR.