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An iterative digital signal processing (DSP) for reducing signal-to-signal beating interference (SSBI) in a multiband direct-detection optical orthogonal frequency division multiplexing (DDO-OFDM) system is proposed and demonstrated experimentally. Without applying any optical/electrical filter in the receiver, all the OFDM signal bands can be almost uniformly recovered even under severely SSBI contamination...
We propose the concept of performance monitoring through channel estimation by receiver signal processing. We show that in coherent-optical-orthogonal-frequency-division-multiplexed (CO-OFDM) systems, critical optical system parameters can be accurately monitored without resorting to separate monitoring devices.
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