TY - JOUR
T1 - Improved Weighted Volterra DFE for C-Band 100-Gbit/s PAM-4 Transmission Over 60-km SSMF
AU - Zhang, Junwei
AU - Tan, Heyun
AU - Hong, Xiaojian
AU - Wu, Xiong
AU - Fei, Chao
AU - Lau, Alan Pak Tao
AU - Lu, Chao
N1 - Funding Information:
This work was supported in part by the National Key Research and Development Program of China under Grant 2018YFB1801701; in part by the National Natural Science Foundation of China under Grant 62101602, Grant 62035018, Grant 62101486, and Grant 62001415; in part by The Hong Kong Government General Research Fund under Grant PolyU 15217620 and Grant PolyU 15220120; in part by the Project of the Shenzhen Municipal Science and Technology Innovation Commission under Grant SGDX20201103095203030; in part by the Project of the Hong Kong Polytechnic University under Grant G-SB1P; in part by the PolyU postdoc matching fund scheme of The Hong Kong Polytechnic University under Grant 1-W150; in part by the China Postdoctoral Science Foundation under Grant 2022M713559; and in part by the Natural Science Foundation of Zhejiang Province under Grant LQ21F050013.
Publisher Copyright:
© 1989-2012 IEEE.
PY - 2023/2/15
Y1 - 2023/2/15
N2 - To cope with the nonlinear distortions and the chromatic dispersion (CD) induced power fading in double-side band (DSB) intensity modulation and direct detection (IM/DD) transmission systems, high-performance Volterra decision-feedback equalizers (VDFEs) are widely applied. However, similar as linear DFE, the VDFEs suffer from error propagation in the case of wrong decisions. In this letter, to reduce the error propagation probability of VDFEs, we propose and experimentally demonstrate a diagonally-pruned improved weighted VDFE (DP-IWVDFE) in a C-band 4-level pulse amplitude modulation (PAM-4) transmission system. By replacing the hard-decision output by the soft-decision feedback symbol based on a compressed sigmoid nonlinear function in DP-IWVDFE, the error propagation probability can be significantly reduced, which lowers the bit error ratio (BER) by a factor of around two as compared to the DP-VDFE. Besides, 100-Gbit/s PAM-4 transmission over 60-km standard single-mode fiber (SSMF) using DP-IWVDFE is realized with the achieved BER below 3.8 × 10-3, achieving around 3.8-dB, 1.5-dB, and 1-dB improvements of the receiver sensitivity over the polynomial DFE (PDFE), improved weighted PDFE (IWPDFE), and DP-VDFE, respectively.
AB - To cope with the nonlinear distortions and the chromatic dispersion (CD) induced power fading in double-side band (DSB) intensity modulation and direct detection (IM/DD) transmission systems, high-performance Volterra decision-feedback equalizers (VDFEs) are widely applied. However, similar as linear DFE, the VDFEs suffer from error propagation in the case of wrong decisions. In this letter, to reduce the error propagation probability of VDFEs, we propose and experimentally demonstrate a diagonally-pruned improved weighted VDFE (DP-IWVDFE) in a C-band 4-level pulse amplitude modulation (PAM-4) transmission system. By replacing the hard-decision output by the soft-decision feedback symbol based on a compressed sigmoid nonlinear function in DP-IWVDFE, the error propagation probability can be significantly reduced, which lowers the bit error ratio (BER) by a factor of around two as compared to the DP-VDFE. Besides, 100-Gbit/s PAM-4 transmission over 60-km standard single-mode fiber (SSMF) using DP-IWVDFE is realized with the achieved BER below 3.8 × 10-3, achieving around 3.8-dB, 1.5-dB, and 1-dB improvements of the receiver sensitivity over the polynomial DFE (PDFE), improved weighted PDFE (IWPDFE), and DP-VDFE, respectively.
KW - 4-level pulse amplitude modulation (PAM-4)
KW - improved weighted Volterra decision-feedback equalizer (IWVDFE)
KW - Intensity modulation and direct detection (IM/DD)
UR - http://www.scopus.com/inward/record.url?scp=85146289428&partnerID=8YFLogxK
U2 - 10.1109/LPT.2022.3229032
DO - 10.1109/LPT.2022.3229032
M3 - Journal article
AN - SCOPUS:85146289428
SN - 1041-1135
VL - 35
SP - 163
EP - 166
JO - IEEE Photonics Technology Letters
JF - IEEE Photonics Technology Letters
IS - 4
ER -