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Appl. Sci. 2019, 9(1), 195; https://doi.org/10.3390/app9010195

Transmission Matrix Measurement of Multimode Optical Fibers by Mode-Selective Excitation Using One Spatial Light Modulator

Technische Universität Dresden, Laboratory of Measurement and Sensor System Technique, Helmholtzstraße 18, 01069 Dresden, Germany
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Received: 14 December 2018 / Revised: 2 January 2019 / Accepted: 4 January 2019 / Published: 8 January 2019
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Abstract

Multimode fibers (MMF) are promising candidates to increase the data rate while reducing the space required for optical fiber networks. However, their use is hampered by mode mixing and other effects, leading to speckled output patterns. This can be overcome by measuring the transmission matrix (TM) of a multimode fiber. In this contribution, a mode-selective excitation of complex amplitudes is performed with only one phase-only spatial light modulator. The light field propagating through the fiber is measured holographically and is analyzed by a rapid decomposition method. This technique requires a small amount of measurements N, which corresponds to the degree of freedom of the fiber. The TM determines the amplitude and phase relationships of the modes, which allows us to understand the mode scrambling processes in the MMF and can be used for mode division multiplexing. View Full-Text
Keywords: multimode fiber; digital holography; mode division multiplexing; transmission matrix multimode fiber; digital holography; mode division multiplexing; transmission matrix
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Rothe, S.; Radner, H.; Koukourakis, N.; Czarske, J.W. Transmission Matrix Measurement of Multimode Optical Fibers by Mode-Selective Excitation Using One Spatial Light Modulator. Appl. Sci. 2019, 9, 195.

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