TY - JOUR
T1 - Clipping discrete multi-tone for peak-power-constraint IM/DD optical systems
AU - Zhou, Ji
AU - Li, Liangchuan
AU - He, Jiale
AU - Lu, Xiaofeng
AU - Bo, Yu
AU - Wang, Guanyu
AU - Huang, Yuanda
AU - Liu, Gengchen
AU - Lu, Yanzhao
AU - Gao, Shecheng
AU - Feng, Yuanhua
AU - Zhao, Shancheng
AU - Liu, Weiping
AU - Yu, Changyuan
AU - Li, Zhaohui
N1 - Funding Information:
This work was supported in part by National Key R&D Program of China (Grant No. 2018YFB1802300), National Natural Science Foundation of China (Grant Nos. 62005102, U2001601, 61971372), Natural Science Foundation of Guangdong Province (Grant No. 2019A1515011059), Guangzhou Basic and Applied Basic Research Foundation (Grant No. 202102020996), Fundamental Research Funds for the Central Universities (Grant No. 21619309), Open Fund of IPOC (BUPT) (Grant No. IPOC2019A001), and Hong Kong Scholars Program (Grant No. XJ2021018).
Publisher Copyright:
© 2023, Science China Press.
PY - 2023/5
Y1 - 2023/5
N2 - High peak-to-average power ratio (PAPR) is a major drawback of discrete multi-tone (DMT) in peak-power-constraint (PPC) intensity-modulation/direct-detection (IM/DD) optical systems. Symmetric clipping operation is a frequently-used and practical method for mitigating the PAPR of the DMT signal. However’ clipping noise is inevitably induced by the symmetric clipping operation’ thereby deteriorating the system’s performance. In this paper, we study the statistical characteristics of the clipping noise in detail. Depending on the statistical characteristics, clipping-noise-cancellation (CNC) algorithms are proposed to mitigate the clipping noise in the clipping DMT systems. Theoretically, the clipping noise can be completely removed using the low-density-parity-check-assisted CNC algorithm (LDPC-assisted CNC algorithm). To verify the superiority of the clipping DMT with the CNC algorithm, we conduct an experiment with a 50 Gb/s DMT system using 10G-class commercial devices for the scenario of PPC passive optical networks. The receiver sensitivity of the clipping DMT system with the CNC algorithm can reach −24 dBm at a 20% soft-decision forward-error-correction limit, which is 2.5 dB higher than that of the DMT system without clipping operation. The clipping operation and the CNC algorithm are added after the original digital signal processing, thereby demonstrating the potential to effectively overcome the drawback in DMT signals and other high-PAPR signals.
AB - High peak-to-average power ratio (PAPR) is a major drawback of discrete multi-tone (DMT) in peak-power-constraint (PPC) intensity-modulation/direct-detection (IM/DD) optical systems. Symmetric clipping operation is a frequently-used and practical method for mitigating the PAPR of the DMT signal. However’ clipping noise is inevitably induced by the symmetric clipping operation’ thereby deteriorating the system’s performance. In this paper, we study the statistical characteristics of the clipping noise in detail. Depending on the statistical characteristics, clipping-noise-cancellation (CNC) algorithms are proposed to mitigate the clipping noise in the clipping DMT systems. Theoretically, the clipping noise can be completely removed using the low-density-parity-check-assisted CNC algorithm (LDPC-assisted CNC algorithm). To verify the superiority of the clipping DMT with the CNC algorithm, we conduct an experiment with a 50 Gb/s DMT system using 10G-class commercial devices for the scenario of PPC passive optical networks. The receiver sensitivity of the clipping DMT system with the CNC algorithm can reach −24 dBm at a 20% soft-decision forward-error-correction limit, which is 2.5 dB higher than that of the DMT system without clipping operation. The clipping operation and the CNC algorithm are added after the original digital signal processing, thereby demonstrating the potential to effectively overcome the drawback in DMT signals and other high-PAPR signals.
KW - clipping-noise cancellation
KW - discrete multi-tone
KW - intensity-modulation/direct-detection optical systems
KW - peak-power constraint
KW - peak-to-average power ratio
UR - http://www.scopus.com/inward/record.url?scp=85149556680&partnerID=8YFLogxK
U2 - 10.1007/s11432-022-3555-y
DO - 10.1007/s11432-022-3555-y
M3 - Journal article
AN - SCOPUS:85149556680
SN - 1674-733X
VL - 66
SP - 1
EP - 11
JO - Science China Information Sciences
JF - Science China Information Sciences
IS - 5
M1 - 152302
ER -