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We employ coherent detection and digital signal processing to characterize dynamic evolution of channel matrix in two-mode fibers. Experimental results reveal that the evolution frequency of channel matrix can reach as fast as 4 kHz.
We demonstrate the real-time implementation of a FPGA-based coherent optical OFDM (CO-OFDM) receiver at 2.5-G samples/s, which successfully receives a subband of a 54-Gb/s multi-band CO-OFDM signal with a record-low error floor of 3.7 times 10-8.
Phase estimation is one of the most critical functions in coherent optical OFDM (CO-OFDM) receivers. We present phase estimation and compensation for a CO-OFDM transmission experiment at 8 Gb/s over 1000-km standard- single-mode-fiber without dispersion compensation.
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