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Title: Joint Hartley-domain and time-domain equalizer for a 200-G (4x56-Gbit/s) optical PAM-4 system using 10G-class optics
Authors: Zhou, J
Qiao, YJ
Yu, CY 
Guo, MQ
Tang, XZ
Liu, WP
Chun, S
Li, ZH
Issue Date: 2018
Publisher: Optical Society of America
Source: Optics express, 24 Dec. 2018, v. 26, no. 26, p. 34451-34460 How to cite?
Journal: Optics express 
Abstract: In this paper, we experimentally demonstrate a 200-G (4x56-Gbit/s) optical 4-level pulse-amplitude modulation (PAM-4) system using 10G-class optics over 10-km standard singlemode fiber and propose a joint Hartley-domain equalizer (HDE) and time-domain equalizer (TDE) algorithm for efficiently compensating the serious high-frequency distortions caused by the bandwidth-limited devices. To the best of our knowledge, the first HDE based on Hartley transform is designed for an optical PAM-4 system. Owing to the real-valued and self-inverse properties of the Hartley transform, the HDE has advantages in processing the real-valued PAM-4 signal. The experimental results show that the joint HDE and TDE algorithm has a better performance than only the HDE or only the TDE. Meanwhile, for obtaining a desired bit error rate, the computational complexity of the joint HDE and TDE algorithm is approximately 6% that of only the TDE with larger tap number. In conclusion, the joint HDE and TDE algorithm shows great potential fig high-speed and cost-sensitive optical PAM-4 systems.
EISSN: 1094-4087
DOI: 10.1364/OE.26.034451
Rights: © 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement (
© 2018 Optical Society of America. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved.
Journal © 2018
The following publication Zhou, J., Qiao, Y. J., Yu, C. Y., Guo, M. Q., Tang, X. Z., Liu, W. P., . . . Li, Z. H. (2018). Joint Hartley-domain and time-domain equalizer for a 200-G (4x56-Gbit/s) optical PAM-4 system using 10G-class optics. Optics Express, 26(26), 34451-34460 is available at
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