Experimental research of UWB over fiber system employing 128-QAM and ISFA-optimized scheme

• Published in: Optical fiber technology 2018-05, Vol.42, p.151-155
• Main Authors: He, Jing, Xiang, Changqing, Long, Fengting, Chen, Zuo
• Format: Article
• Language: English
• Subjects: Multiband orthogonal frequency-division multiplexing (MB-OFDM); Training sequence-based channel estimation; Ultra-wideband over fiber (UWBoF) system
• ISSN: 1068-5200; 1095-9912
• DOI: 10.1016/j.yofte.2018.03.002

•An optimized ISFA-scheme is proposed in MB-OFDM UWBoF system.•The optimal ISFA window size for each MB-OFDM UWB sub-band is investigated.•The 128-QAM UWB transmission over fiber system are experimentally demonstrated.•The experimental results show significant performance improvement of the system. In this paper, an optimized intra-symbol frequency-domain averaging (ISFA) scheme is proposed and experimentally demonstrated in intensity-modulation and direct-detection (IMDD) multiband orthogonal frequency division multiplexing (MB-OFDM) ultra-wideband over fiber (UWBoF) system. According to the channel responses of three MB-OFDM UWB sub-bands, the optimal ISFA window size for each sub-band is investigated. After 60-km standard single mode fiber (SSMF) transmission, the experimental results show that, at the bit error rate (BER) of 3.8 × 10−3, the receiver sensitivity of 128-quadrature amplitude modulation (QAM) can be improved by 1.9 dB using the proposed enhanced ISFA combined with training sequence (TS)-based channel estimation scheme, compared with the conventional TS-based channel estimation. Moreover, the spectral efficiency (SE) is up to 5.39 bit/s/Hz.