Open AccessPrototype system for real-time IM/DD MDM transmission based on multiple-ring-core FMF and degenerate-mode-selective reception
Author(s) -
Yuyang Gao,
Dawei Ge,
Jian Cui,
Junchi Jia,
Yongqi He,
Zhangyuan Chen,
Guifang Li,
Juhao Li
Publication year - 2019
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.376672
Subject(s) - physics , multiplexer , digital signal processing , optics , multiplexing , wavelength division multiplexing , single mode optical fiber , transmission (telecommunications) , multi mode optical fiber , electronic engineering , computer science , wavelength , optical fiber , computer hardware , telecommunications , engineering
Multiple-input-multiple-output digital signal processing (DSP) has become a severe bottleneck for mode division multiplexing (MDM) because of its huge computational complexity. In this paper, we propose a novel scheme for real-time DSP-free intensity-modulation/direct-detection (IM/DD) MDM transmission, in which the transmission few-mode fiber (FMF) is characterized by multiple-ring-core structure to suppress modal crosstalk among each LP mode, while each pair of non-circularly-symmetric degenerate modes is simultaneously demultiplexed by a degenerate-mode-selective fiber coupler for DSP-free reception. Based on a 10 km ultralow-modal-crosstalk double-ring-core FMF and a pair of all-fiber 4-LP-mode MUX/DEMUX, we demonstrate the first IM/DD MDM prototype system using commercial single-mode (SM) 10 Gbps SFP + modules and 4K video transceivers without any hardware modifications. The temperature and wavelength dependence are evaluated. The stable Q 2 -factor performance proves that it can be a smooth evolution scheme from conventional SM IM/DD systems. Moreover, the scheme can be further extended to support more modes with improved FMF design adopting more ring areas.