All-fiber reflective single-pixel imaging with long working distance

• We demonstrate the reflective MMF-based single-pixel imaging (SPI) for label-free diffusive objects with the sampling rate of less than 4% • We achieve reflective optical fiber-based SPI with the working distance of about 6 mm and field of view of about 9 mm 2 . • An all-fiber SPI system is built and the wavelength-dependent MMF speckle is generated to illuminate the object. We demonstrate all-fiber reflective single-pixel imaging with a long working distance and large field of view. The wavelength-dependent multimode fiber speckle is generated to illuminate the object, which further ensures the compactness and stability of the system. By the collimated MMF speckle patterns and the optical fiber receiving device, we achieve reflective optical fiber single-pixel imaging with a working distance of over 5 mm and a field of view of about 9 mm 2 . Based on compressed sensing, we can reconstruct object images with a sampling rate of about 4 %. This work provides a method and reference for the practical applications of optical fiber endoscopic imaging with requirements for a long working distance and large field of view.