Abstract

A 5 × 100-Gb/s discrete-Fourier-transform spread (DFT-spread) discrete multi-tone wavelength division multiplexing passive optical network (DMT-WDM-PON) employing low-density parity-check (LDPC) coded probabilistic shaping 16-ary quadrature amplitude modulation (PS-16 QAM) is proposed and experimentally demonstrated. We first introduce PS-16 QAM mapping scheme with 16-point constellation reshaped from 32 symbols into splitter-based DMT-WDM-PON. The DMT-WDM-PON employing PS-16 QAM can achieve superior receiver power sensitivity (RPS) and enhanced spectral efficiency (SE) compared with the unshaped one. Compatible with the forward error correction (FEC) implemented in most of the optical transponders today, an optimized bit-interleaved coded modulation iterative decoding (BICM-ID) system based on LDPC coding is proposed to encode the PS-16 QAM DMT signal without any extra shaping codes or overheads. Then the labeling optimization with the assistance of extrinsic information transfer (EXIT) chart is investigated, in which the extrinsic messages are transferred between the PS demapper and the LDPC decoder for retrieving the PS-16 QAM DMT signal. Furthermore, the experimental results show that 1.5-dB RPS improvement and 2-dB fiber nonlinear effect tolerance enhancement are respectively realized over a 20-km standard single-mode fiber (SSMF) link by using joint applications of DFT-spread scheme and PS-16 QAM mapping in proposed DMT-WDM-PON system, which can thus provide abundant system loss budget for the legacy optical distribution networks (ODNs).

LDPC-coded DFT-Spread DMT signal transmission employing probabilistic shaping 16/32QAM for optical interconnection

Xinxing Wu, Dongdong Zou, Ze Dong, Xue Zhao, Yifan Chen, and Fan Li
Opt. Express 27(7) 9821-9828 (2019)

Enhanced symbol capacity and loss budget employing joint channel coded modulation in DMT-WDM-PON

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)

Low-complexity probabilistic shaping based on bit-weighted distribution matching in DMT-WDM-PON

Yifan Chen, Hailian He, Xue Zhao, Zhenqi Cao, Lin Zhou, and Ze Dong
Opt. Express 28(15) 21814-21824 (2020)

Experimental demonstration of flexible information rate PON beyond 100 Gb/s with rate-compatible LDPC codes

Xiangli Zhang, Yunpeng Xuan, Zepeng Gong, Xu Zhang, Jie Li, Ming Luo, Bowen Jia, Dapeng Luo, Tianye Huang, and Xiang Li
Opt. Express 32(9) 15444-15459 (2024)

Real-time demonstration of a low-complexity PS scheme for 16QAM-DMT signals in an IM-DD system

Long Zhang, Kaihui Wang, Chen Wang, Ming Chen, Junjie Ding, Bohan Sang, Junting Shi, Jiaxuan Liu, Mingxv Wang, Yi Wei, Yun Chen, Li Zhao, Wen Zhou, and Jianjun Yu
Opt. Express 31(7) 11447-11456 (2023)