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We present the first real-time transmission experiment over a 60-km-long fiber supporting six coupled spatial and polarization modes, enabled by a custom receiver board and an FPGA-implementation of an unconstrained adaptive frequency-domain MIMO equalizer.
We transmit over all 30 spatial and polarization modes of a 22.8-km multimode fiber. 15-mode photonic lanterns enabled low-loss coupling into and out of the fiber and a time-multiplexed coherent receiver facilitates measurement of all 30 signals.
We investigate the role of mode-dependent loss (MDL), gain (MDG), and noise figure (MDF) in optically amplified multiple-input-multiple-output space-division multiplexed (MIMO-SDM) communication systems through capacity analyses, bit error ratio simulations, and experiments.
As spatial division multiplexed transmission systems employing few mode fibers (FMFs) rely heavily on digital signal processing (DSP), the impact of computational complexity should be considered. A key DSP process block is the carrier phase estimation (CPE), which consists of a phase estimator and digital phase locked loop (DPLL) per output. In this letter, a low complexity phase estimator is proposed,...
We propose a low-cost optically-fed architecture capable of increasing the capacity and overall coverage of IEEE 802.11n MIMO WLAN system for in-building networks. A fully functional transmission over GI-MMF was demonstrated employing 2×3 MIMO configuration.
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