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Real-time polarization division multiplexed coherent optical OFDM receiver is demonstrated to receive 28.6-Gb/s data per optical wavelength in single intradyne detection. QPSK modulated sub-carriers are detected using 9.83-GS/s ADCs and DSP implemented on three FPGAs.
A 12.1-Gb/s single-band real-time CO-OFDM receiver is demonstrated. The signal streams are sampled by two 3.4-GHz ADCs and processed in one FPGA chip. The record data rate is realized in 16-QAM modulation format and the resultant BER is better than the FEC threshold.
We review the progresses made towards real-time implementation of optical OFDM, with emphasis on the needed digital signal processing (DSP). Various OFDM procedures and algorithms are discussed in the context of DSP-efficiency and resource requirement.
A real-time dual-polarization CO-OFDM receiver in a 2times2 multiple-input multiple-output (MIMO) configuration is demonstrated. The signal streams are processed in real-time mode, and the data rates of 3.33 Gbps and 6.67 Gbps are realized for 4-QAM and 16-QAM respectively.
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.
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