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Recent real-time optical OFDM (OOFDM) research progress is reviewed extensively in terms of adaptive transceiver design, intensity modulators, synchronisation techniques and network architectures. Results indicate that OOFDM is feasible for mass deployment in PONs.
Low-cost, narrow modulation bandwidth, un-cooled VCSELs can be utilized to directly modulate 64-QAM-encoded 11.25Gb/s signals for end-to-end real-time optical OFDM transmission over 25km SSMF IMDD systems with excellent performance robustness.
The use of real-valued electrical OFDM signals to modulate only phases of RF carriers prior to optical intensity modulation can significantly lower the requirements on key transceiver components, and simultaneously improves the transmission performance in SMF-based IMDD systems.
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