Open AccessExperimental demonstration of 1111-Gb/s net information rate using IM/DD probabilistically shaped orthogonal chirp-division multiplexing with a 10-GHz-class modulator
Author(s) -
Zhouyi Hu,
Yingjie Shao,
Xing Ouyang,
Y. L. Tong,
Jian Zhao,
Hon Ki Tsang,
Paul D. Townsend,
Chun-Kit Chan
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.27.033789
Subject(s) - quadrature amplitude modulation , multiplexing , electronic engineering , orthogonal frequency division multiplexing , computer science , qam , chirp , spectral efficiency , optics , modulation (music) , channel (broadcasting) , physics , telecommunications , engineering , bit error rate , acoustics , laser
We propose probabilistically shaped quadrature amplitude modulation (PS-QAM) formats to maximize the capacity in fiber transmission systems using orthogonal chirp-division multiplexing (OCDM). OCDM possesses the property of chirp spread spectrum (CSS), leading to improved resilience to system impairments. We further investigate the recently proposed robust channel estimator based on pulse compression and noise rejection and experimentally demonstrate its feasibility in an intensity-modulated/direction-detection (IM/DD) OCDM system. By applying the proposed PS-QAM based OCDM to an IM/DD optical system, a net information rate of 111.1 Gb/s has been successfully achieved using a 10-GHz class Mach-Zehnder modulator (MZM) and has also shown improved performance compared to the conventional PS-QAM based orthogonal frequency-division multiplexing (OFDM) systems. Moreover, due to the superior characteristics of OCDM, there is no need for additional feedback to obtain the prior knowledge of channel state information in the proposed system, leading to reduced complexity and cost.