Abstract
A direct detection optical orthogonal frequency division multiplexing (DDO-OFDM) system using turbo codes is built, and the transmission performance comparison between coded system and uncoded system is analyzed. Three decoding algorithms, which are Log-maximum a posteriori (MAP), Max-Log-MAP and threshold Max-Log-MAP, are used in the turbo coded system. By comparing three decoding algorithms, the system using Max-Log-MAP algorithm has the best bit error rate (BER) performance. At the transmission distance of 240 km, the uncoded system with transmission rate of 30 Gbit/s can get the BER performance at the degree of 8.93×10−3 with optical signal to noise ratio (OSNR) of 24 dB, while the turbo coded system with transmission rate of 50 Gbit/s can achieve it within OSNR of 20 dB.
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This work has been supported by the National Natural Science Foundation of China (No.61107052), the Tianjin Natural Science Foundation of China (No.11JCYBJC0010), and the Tianjin Youth Foundation of China (No.13JCQNJC01800).
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Tong, Zr., Hu, Gb., Cao, Y. et al. Research on the transmission performance of turbo codes in DDO-OFDM system. Optoelectron. Lett. 11, 134–136 (2015). https://doi.org/10.1007/s11801-015-4210-3
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DOI: https://doi.org/10.1007/s11801-015-4210-3