NDLI: Matched Filtering for MIMO Coherent Optical Communications with Mode-Dependent Loss Channels

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Matched Filtering for MIMO Coherent Optical Communications with Mode-Dependent Loss Channels

Content Provider	MDPI
Author	Francisco, J. Cañete Luis, Díez Torres, Luis M.
Copyright Year	2022
Description	The use of digital signal processors (DSP) to equalize coherent optical communication systems based on spatial division multiplexing (SDM) techniques is widespread in current optical receivers. However, most of DSP implementation approaches found in the literature assume a negligible mode-dependent loss (MDL). This paper is focused on the linear multiple-input multiple-output (MIMO) receiver designed to optimize the minimum mean square error (MMSE) for a coherent SDM optical communication system, without previous assumptions on receiver oversampling or analog front-end realizations. The influence of the roll-off factor of a generic pulse-amplitude modulation (PAM) transmitter on system performance is studied as well. As a main result of the proposed approach, the ability of a simple match filter (MF) based MIMO receiver to completely eliminate inter-symbol interference (ISI) and crosstalk for SDM systems under the assumption of negligible MDL is demonstrated. The performance of the linear MIMO fractionally-spaced equalizer (FSE) receiver for an SDM system with a MDL-impaired channel is then evaluated by numerical simulations using novel system performance indicators, in the form of signal to noise and distortion ratio (SNDR) loss, with respect to the case without MDL. System performance improvements by increasing the transmitter roll-off factor are also quantified.
Starting Page	798
e-ISSN	14248220
DOI	10.3390/s22030798
Journal	Sensors
Issue Number	3
Volume Number	22
Language	English
Publisher	MDPI
Publisher Date	2022-01-21
Access Restriction	Open
Subject Keyword	Sensors Telecommunications Coherent Optical Communication Optical Fiber Communication Mimo Adaptive Equalizer Matched Filter Mmse Spatial Division Multiplexing (sdm) Polarization Division Multiplexing Fractional-spaced Equalizer (fse)
Content Type	Text
Resource Type	Article

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