Influence and analysis of measurement errors of the complex coherence’s modulus on reconstructed image quality

Interferometric imaging technology requires accurate acquisition of the modulus, phase, and spatial frequency coordinate information of the complex coherence when reconstructing the target image. Due to the inherent jitter of optical fibers, it is relatively difficult to accurately obtain the phase information. Using the continuous hybrid input–output algorithm, the target image can be reconstructed when only the modulus and spatial frequency coordinate information of the complex coherence are known. However, in the actual imaging process, there are always certain errors in the measurement of the modulus and spatial frequency coordinate information, which affects the quality of the reconstructed image. Based on the theoretical calculation formula of the complex coherence modulus, we analyzed the factors affecting the measurement results of the complex coherence modulus and built an indoor testbed for experimental verification. Finally, through theoretical simulation, the impact of the error in the measurement of the complex coherence modulus on the quality of the reconstructed image was analyzed, proving the necessity of accurate measurement of the complex coherence modulus. The experimental and simulation results have important guiding significance for the design of subsequent interferometric imaging systems and experimental schemes.