Influences of core diameter on the quality of multimode fiber imaging based on compressive sensing

Abstract

Multimode fiber (MMF) imaging based on compressive sensing (CS) is a promising technique for ultrathin endoscopic applications due to its advantages such as small size, low cost, and high speed. However, how to choose the most suitable MMF in the application has not been analyzed in detail. In this paper, the influences of fiber core diameter on the quality of CS MMF imaging are investigated theoretically and experimentally. Firstly, the relationship between the core diameter of MMF and the speckle size of its output speckle patterns is established. Then the speckle patterns with different speckle sizes are synthesized to explore their impact on imaging quality. Results show that a MMF with a larger core diameter yields better image quality in ideal conditions, while the most suitable core diameter decreases with the increasing noise or/and declining sampling rate. Finally, an experimental platform is built to verify the simulation, the same trends between experimental results and simulation results validate the feasibility of the simulation method. This paper provides a reference on how to choose a more suitable MMF to obtain a high-quality image in practical applications.