TY - GEN
T1 - Clipping PAM4 for 56G ER Optical Interconnects Using Cost-Effective 10G-Class TOSA and ROSA
AU - Lu, Qingxin
AU - Zhou, Ji
AU - Wang, Haide
AU - Liu, Weiping
AU - Yu, Changyuan
AU - Li, Zhaohui
N1 - Publisher Copyright:
© 2023 IEEE.
PY - 2023/11
Y1 - 2023/11
N2 - Amplifier-free O-band intensity modulation direct detection (IM/DD) optical system has been applied in the extended-reach (ER) optical interconnects. The amplifier-free IM/DD optical systems are peak-power constrained, in which a high-peak-to-average power ratio (PAPR) signal leads to a low optical power budget. In this paper, we propose the symmetric clipping operation to reduce the high PAPR of the Nyquist-shaping four-level pulse amplitude modulation (PAM4) signal, and the clipping noise cancellation (CNC) to remove the clipping noise. 56G PAM4-based ER optical interconnects are experimentally demonstrated by using 10G-class transmitter optical sub-assembly (TOSA) and receiver optical sub-assembly (ROSA). The experimental results show that the clipping operation and CNC algorithm can bring down the bit error ratio under the KP4 forward-error-correction limit of 2.2× 10-4 at the received optical power of -16dBm. Based on the proposed algorithm, the optical power budget of 56G PAM4-based ER optical interconnects is ∼ 24dB, which is ∼ 3dB higher than that using only clipping operation. The sufficient optical power budget makes the cost-effective 10G-class optical components feasible for ER optical interconnects.
AB - Amplifier-free O-band intensity modulation direct detection (IM/DD) optical system has been applied in the extended-reach (ER) optical interconnects. The amplifier-free IM/DD optical systems are peak-power constrained, in which a high-peak-to-average power ratio (PAPR) signal leads to a low optical power budget. In this paper, we propose the symmetric clipping operation to reduce the high PAPR of the Nyquist-shaping four-level pulse amplitude modulation (PAM4) signal, and the clipping noise cancellation (CNC) to remove the clipping noise. 56G PAM4-based ER optical interconnects are experimentally demonstrated by using 10G-class transmitter optical sub-assembly (TOSA) and receiver optical sub-assembly (ROSA). The experimental results show that the clipping operation and CNC algorithm can bring down the bit error ratio under the KP4 forward-error-correction limit of 2.2× 10-4 at the received optical power of -16dBm. Based on the proposed algorithm, the optical power budget of 56G PAM4-based ER optical interconnects is ∼ 24dB, which is ∼ 3dB higher than that using only clipping operation. The sufficient optical power budget makes the cost-effective 10G-class optical components feasible for ER optical interconnects.
KW - 10G-class TOSA and ROSA
KW - clipping noise cancellation
KW - clipping operation
KW - Optical interconnects
KW - PAM4
UR - http://www.scopus.com/inward/record.url?scp=85183304079&partnerID=8YFLogxK
U2 - 10.1109/ACP/POEM59049.2023.10369058
DO - 10.1109/ACP/POEM59049.2023.10369058
M3 - Conference article published in proceeding or book
AN - SCOPUS:85183304079
T3 - 2023 Asia Communications and Photonics Conference/2023 International Photonics and Optoelectronics Meetings, ACP/POEM 2023
BT - 2023 Asia Communications and Photonics Conference/2023 International Photonics and Optoelectronics Meetings, ACP/POEM 2023
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2023 Asia Communications and Photonics Conference/2023 International Photonics and Optoelectronics Meetings, ACP/POEM 2023
Y2 - 4 November 2023 through 7 November 2023
ER -