Reach Enhancement for WDM Direct-Detection Subcarrier Modulation using Low-Complexity Two-Stage Signal-Signal Beat Interference Cancellation

We describe a novel low-complexity SSBI cancellation scheme, and experimentally investigate its performance in a 7x25 Gb/s WDM direct-detection single-sideband 16QAM Nyquist-subcarrier modulation system. The scheme achieves a doubling of the transmission reach.