Abstract
We present the fundamentals of multi-input multi-output (MIMO) signal processing for mode-division multiplexing (MDM) in multi-mode fiber. We review group delay management techniques that minimize adaptation time and complexity in MIMO signal processing. We describe long-period fiber grating (LPFG) devices for introducing strong mode coupling, which represent a promising practical approach for group delay management. We analyze MIMO equalization complexity, adaptation time and throughput efficiency for MDM systems employing LPFG devices.
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