Abstract
A novel symbol division multiplexing (SDM) technology is proposed in an intensity modulation and direct detection (IM/DD) pulse amplitude modulation (PAM) optical interconnection. The SDM-PAM4 symbol is the multiplexing of two standard 3-bit PAM8 symbols based on many-to-one (MTO) mapping, increasing by an extra 50% the line rate compared with a typical PAM4 under the same symbol rate and channel bandwidth. The forward error correction (FEC) based on low-density parity-check coding establishes a mechanism between the codewords of both intra- and inter-SDM-PAM4 symbols, to theoretically support the iterative decoding of symbol de-multiplexing employing an optimized bit-interleaved coded modulation iterative decoding (BICM-ID) system. Furthermore, since SDM evidently reduces the mapping order of the PAM signal, the transmission reliability can be effectively improved by alleviating the impairments mainly caused by fiber chromatic dispersion and Kerr nonlinearity. The experimental results indicate that the SDM-PAM4 can achieve more than 5 dB superior systematic receiver power sensitivity over 10-km single mode fiber transmission, and thus represent an important development in coding and modulation multiplexing techniques for optical interconnection systems.
© 2022 Optica Publishing Group
Full Article | PDF ArticleMore Like This
Ze Dong, Jianjun Yu, Yifan Chen, Fan Li, and Xiangjun Xin
Opt. Express 30(9) 14998-15007 (2022)
Mengfan Fu, Yicheng Xu, Xiaomin Liu, Yu Guo, Weisheng Hu, and Qunbi Zhuge
Opt. Lett. 49(4) 943-946 (2024)
Hailian He, Jun Ming, Junyuan Song, Yuyao Wen, Dong Guo, Xiangjun Xin, Ran Gao, Zhipei Li, Xiaolong Pan, and Ze Dong
J. Opt. Commun. Netw. 15(12) 1030-1037 (2023)