Experimental demonstration of the transmission performance for LDPC-coded multiband OFDM ultra-wideband over fiber system

Abstract

To improve the transmission performance of multiband orthogonal frequency division multiplexing (MB-OFDM) ultra-wideband (UWB) over optical fiber, a pre-coding scheme based on low-density parity-check (LDPC) is adopted and experimentally demonstrated in the intensity-modulation and direct-detection MB-OFDM UWB over fiber system. Meanwhile, a symbol synchronization and pilot-aided channel estimation scheme is implemented on the receiver of the MB-OFDM UWB over fiber system. The experimental results show that the LDPC pre-coding scheme can work effectively in the MB-OFDM UWB over fiber system. After 70km standard single-mode fiber (SSMF) transmission, at the bit error rate of 1×10−3, the receiver sensitivities are improved about 4dB when the LDPC code rate is 75%.