Demonstration of DFT-spread 256QAM-OFDM signal transmission with cost-effective directly modulated laser

被引：39
作者：
Li, Fan [1 ,2 ]
Yu, Jianjun [2 ]
Fang, Yuan [3 ]
Dong, Ze [2 ]
Li, Xinying [3 ]
Chen, Lin [1 ]
机构：
[1] Hunan Univ, Changsha 410082, Hunan, Peoples R China
[2] ZTE TX Inc, Morristown, NJ 07960 USA
[3] Fudan Univ, Shanghai 200433, Peoples R China
来源：
OPTICS EXPRESS | 2014年 / 22卷 / 07期
关键词：
OPTICAL OFDM TRANSMISSION; FIBER NONLINEARITY MITIGATION; CHANNEL ESTIMATION; PHASE NOISE; SYSTEMS;
D O I：
10.1364/OE.22.008742
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We experimentally demonstrated a 256-ary quadrature amplitude modulation (256QAM) direct-detection optical orthogonal frequency division multiplexing (DDO-OFDM) transmission system utilizing a cost-effective directly modulated laser (DML). Intra-symbol frequency-domain averaging (ISFA) is applied to suppress in-band noise while the channel response estimation and Discrete Fourier Transform-spread (DFT-spread) is used to reduce the peak-to-average power ratio (PAPR) of the transmitted OFDM signal. The bit-error ratio (BER) of 15-Gbit/s 256QAM-OFDM signal has been measured after 20-km SSMF transmission that is less than 7% forward-error-correction (FEC) threshold of 3.8 x 10(-3) as the launch power into fiber is set at 6dBm. For 11.85-Gbit/s 256QAM-OFDM signal, with the aid of ISFA-based channel estimation and PAPR reduction enabled by DFT-spread, the BER after 20-km SSMF transmission can be improved from 6.4 x 10(-3) to 6.8 x 10(-4) when the received optical power is -6dBm. (C) 2014 Optical Society of America
引用
收藏
页码：8742 / 8748
页数：7
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