Abstract
In this paper, the RS-Turbo concatenated code is applied to coherent optical orthogonal frequency division multiplexing (CO-OFDM) system. RS(186,166,8) and Turbo code with code rate of 1/2 are employed for RS-Turbo concatenated code. Two decoding algorithms, which are Max-Log-MAP algorithm and Log-MAP algorithm, are adopted for Turbo decoding, and the iteration Berlekamp-Massey (BM) algorithm is adopted for RS decoding. The simulation results show that the bit error rate (BER) performance of CO-OFDM system with RS-Turbo concatenated code is significantly improved at high optical signal to noise ratio (OSNR), and the iteration number is reduced compared with that of the Turbo coded system. Furthermore, when the Max-Log-MAP algorithm is adopted for Turbo decoding, the transmission distance of CO-OFDM system with RS-Turbo concatenated code can reach about 400 km without error, while that of the Turbo coded system can only reach about 240 km when BER is lower than 10-4 order of magnitude.
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This work has been supported by the National Natural Science Foundation of China (No.61107052), Tianjin Natural Science Foundation of China (No.11JCYBJC0010), and Tianjin Youth Foundation of China (No.13JCQNJC01800).
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Tong, Zr., Hu, Gb., Cao, Y. et al. Performance of CO-OFDM system with RS-Turbo concatenated code. Optoelectron. Lett. 11, 457–460 (2015). https://doi.org/10.1007/s11801-015-5118-7
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DOI: https://doi.org/10.1007/s11801-015-5118-7