Abstract
In this paper, an intensity-modulated direct-detection (IM/DD) multiband orthogonal-frequency-division-multiplexing ultra-wideband over fiber (MB-OFDM UWBoF) transmission system using a low-cost directly modulated laser (DML) is analyzed and experimentally verified. Precoding techniques and inter-symbol frequency-domain averaging (ISFA) algorithm are used in this experiment. Precoding techniques are used to suppress the noise introduced by DML and the power fading due to the imperfect frequency response of optoelectronic devices and frequency selective fading. Orthogonal Circular Matrix Transform (OCT) precoding and Discrete Fourier Transform (DFT) precoding were compared when the ISFA algorithm was used. In this scheme, for a single-mode fiber (SMF) link at a distance of 20 km, the 64 Quadrature amplitude modulation (QAM) mapped MB-OFDM UWBoF system using OCT precoding with ISFA and DFT precoding with ISFA scheme can improve the sensitivity of the optical receiver by 0.4 dBm and 0.284 dBm, respectively, compared to no precoding with ISFA at a BER of 3.8e-3. The minimum BER of the 64QAM mapped MB-OFDM UWBoF system scheme with OCT precoding and ISFA scheme is 2.56e-5, which achieves two orders of magnitude improvement compared to the BER threshold of the 7% hard-decision forward error correction (HD-FEC, 3.8e-3).
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