TY - JOUR
T1 - Decision-Feedback Frequency-Domain Volterra Nonlinear Equalizer for IM/DD OFDM Long-Reach PON
AU - Zhang, Junwei
AU - Guo, Changjian
AU - Liu, Jie
AU - Wu, Xiong
AU - Lau, Alan Pak Tao
AU - Lu, Chao
AU - Yu, Siyuan
N1 - Funding Information:
Manuscript received December 14, 2018; revised March 21, 2019; accepted May 3, 2019. Date of publication May 7, 2019; date of current version June 5, 2019. This work was supported in part by the National Natural Science Foundations of China (61875233), in part by the Guangdong Natural Science Foundation (2016A030313289, 2018A0303130117), in part by the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program (2017BT01X121), and in part by the Pearl River S&T Nova Program of Guangzhou (201710010028). (Junwei Zhang and Changjian Guo contributed equally to this work.) (Corresponding authors: Jie Liu and Changjian Guo.) J. Zhang, J. Liu, and X. Wu are with the State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510006, China (e-mail: zhangjw79 @mail2.sysu.edu.cn; liujie47@mail.sysu.edu.cn; 1825817441@qq.com).
Publisher Copyright:
© 2019 IEEE.
PY - 2019/7/1
Y1 - 2019/7/1
N2 - A low-complexity third-order decision-feedback frequency-domain Volterra nonlinear equalizer (DF-FD-VNLE) with superior nonlinearity-compensation performance is proposed and experimentally demonstrated for OFDM long-reach PONs. High optical launch power up to 18 dBm is implemented to mitigate the chromatic dispersion induced power fading and increase the power budget. By reconstructing and subtracting the nonlinear noise in frequency domain with the knowledge of the nonlinear channel, the proposed DF-FD-VNLE outperforms the conventional time-domain VNLE (TD-VNLE) and feed-forward FD-VNLE (FF-FD-VNLE), resulting in better received signal-to-noise ratio (SNR) performance. The nonlinearity-compensation performance of the DF-FD-VNLE can be further improved with the usage of a FF-FD-VNLE or more than one iteration. Complexity and experimental analyses show that similar complexity and higher SNR can be achieved by using the one-iteration DF-FD-VNLE with FD linear equalization (FD-LE), compared with that of the FF-FD-VNLE. Compared with conventional TD-VNLE, the required number of real-valued multiplication (RNRM) of the one-iteration DF-FD-VNLE with FF-FD-VNLE (FD-LE) is reduced by a factor of as much as 82.19% (89.61%) at a memory length of 14 and a truncation factor of 3. Based on the one-iteration DF-FD-VNLE with FF-FD-VNLE, around 53.79 Gb/s single wavelength OFDM IM-DD transmission over 60.8-km SSMF is successfully demonstrated at a BER of 3.8 × 10-3 and a received optical power (ROP) of -2 dBm, achieving 15% capacity improvement compared to the conventional TD-VNLE.
AB - A low-complexity third-order decision-feedback frequency-domain Volterra nonlinear equalizer (DF-FD-VNLE) with superior nonlinearity-compensation performance is proposed and experimentally demonstrated for OFDM long-reach PONs. High optical launch power up to 18 dBm is implemented to mitigate the chromatic dispersion induced power fading and increase the power budget. By reconstructing and subtracting the nonlinear noise in frequency domain with the knowledge of the nonlinear channel, the proposed DF-FD-VNLE outperforms the conventional time-domain VNLE (TD-VNLE) and feed-forward FD-VNLE (FF-FD-VNLE), resulting in better received signal-to-noise ratio (SNR) performance. The nonlinearity-compensation performance of the DF-FD-VNLE can be further improved with the usage of a FF-FD-VNLE or more than one iteration. Complexity and experimental analyses show that similar complexity and higher SNR can be achieved by using the one-iteration DF-FD-VNLE with FD linear equalization (FD-LE), compared with that of the FF-FD-VNLE. Compared with conventional TD-VNLE, the required number of real-valued multiplication (RNRM) of the one-iteration DF-FD-VNLE with FF-FD-VNLE (FD-LE) is reduced by a factor of as much as 82.19% (89.61%) at a memory length of 14 and a truncation factor of 3. Based on the one-iteration DF-FD-VNLE with FF-FD-VNLE, around 53.79 Gb/s single wavelength OFDM IM-DD transmission over 60.8-km SSMF is successfully demonstrated at a BER of 3.8 × 10-3 and a received optical power (ROP) of -2 dBm, achieving 15% capacity improvement compared to the conventional TD-VNLE.
KW - Decision-feedback frequency-domain Volterra nonlinear equalizer (DF-FD-VNLE)
KW - intensity modulation and direct detection (IM-DD)
KW - orthogonal frequency division multiplexing (OFDM)
UR - http://www.scopus.com/inward/record.url?scp=85067108354&partnerID=8YFLogxK
U2 - 10.1109/JLT.2019.2915329
DO - 10.1109/JLT.2019.2915329
M3 - Journal article
AN - SCOPUS:85067108354
SN - 0733-8724
VL - 37
SP - 3333
EP - 3342
JO - Journal of Lightwave Technology
JF - Journal of Lightwave Technology
IS - 13
M1 - 8707955
ER -