Retrieving the optical transmission matrix of a multimode fiber using the extended Kalman filter

PLUTO / PLUTO-2 Spatial Light Modulators
Misc.: Speckle / Characterization / Metrology Turbid-/ Opaque Media /Multi Scattering
Published on:
Authors: Guoqiang Huang and Daixuan Wu and Jiawei Luo and Yin Huang and Yuecheng Shen
Abstract:

” Characterizing the transmission matrix (TM) of a multimode fiber (MMF) benefits many fiber-based applications and allows in-depth studies on the physical properties. For example, by modulating the incident field, the knowledge of the TM allows one to synthesize _x000D_
any optical field at the distill end of the MMF. However, the extraction of optical fields usually requires holographic measurements with interferometry, which complicates the system design and introduces additional noise. In this work, we developed an efficient method to retrieve the TM of the MMF in a referenceless optical system. With pure intensity measurements, this method uses the extended Kalman filter (EKF) to recursively search for the optimum solution. To facilitate the computational process, a modified speckle-correlation scatter matrix (MSSM) is constructed as a low-fidelity initial estimation. This method, termed EKF-MSSM, only requires 4N intensity measurements to precisely solve for N unknown complex variables in the TM. Experimentally, we successfully retrieved the TM of the MMF with high precision, which allows optical focusing with the enhancement (>70%) close to the theoretical value. We anticipate that this method will serve as a useful tool for studying physical properties of the MMFs and potentially open new possibilities in a variety of applications in fiber optics.”

Open Access

Publication: Optics Express
Issue/Year: Vol. 28, Issue 7, pp. 9487-9500
DOI: 10.1364/OE.389133
Link: https://doi.org/10.1364/OE.389133

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