High-resolution Microwave Photonic Filtering Interrogation Technology Based on Time-domain Refined Analysis

The time-domain analysis has been widely used in microwave photonic filtering based interrogation for fiber Bragg grating (FBG) array. In order to solve the problem that the interrogation resolution is limited by RF detection bandwidth in traditional time-domain analysis methods, a novel time-domain analysis with refinement capability has been developed. The proposed time-domain analysis algorithm was theoretically deduced and the feasibility of the proposed method was validated by simulation. Compared to traditional time-domain analysis methods, the proposed time-domain refinement algorithm can greatly improve the interrogation resolution and the demodulation speed at the same system parameters.