Abstract

Semiconductor optical amplifier (SOA) is regarded as a promising candidate to amplify the optical signal in next-generation access network, especially for O-band signal transmission. However, the SOA-based system suffers from the pattern-dependent effect due to its gain saturation. Compared to digital signal processing (DSP) at receiver, DSP in the transmitter can reduce implementation complexity, which is attractive for the multi-user system. In this paper, we propose three methods to mitigate the pattern-dependent effect in SOA and compare their performance based on: 1) look-up-table (LUT) considering pattern-dependent effect, 2) pre-distortion without considering pattern-dependent effect, 3) probabilistic shaping (PS). The performance of three mitigation methods is investigated in an intensity modulation with direct detection (IM/DD) 4-ary pulse-amplitude-modulation (PAM-4) transmission system at O-band. Our research results show that all these schemes can improve the receiver dynamic range of PAM-4 signals at 50 Gbit/s and 100 Gbit/s. Moreover, PS and LUT can also improve the receiver dynamic range of 75-Gbit/s PAM-8 signals.

SOA pattern effect mitigation by neural network based pre-equalizer for 50G PON

Lei Xue, Lilin Yi, Rui Lin, Luyao Huang, and Jiajia Chen
Opt. Express 29(16) 24714-24722 (2021)

C-band 200 Gbit/s/λ PAM-4 transmission over 2-km SSMF using look-up-table pre-distortion combined with nonlinear Tomlinson-Harashima pre-coding

Yucheng Tu, Hailin Yang, Gai Zhou, Meng Xiang, Songnian Fu, Ming Tang, Yuwen Qin, and Luming Zhao
Opt. Express 30(9) 15416-15427 (2022)

Impact of SOA-induced pattern effect on the filter requirements in vestigial sideband direct detected PAM4 transmission

Yan Fu, Haiyun Xin, Kuo Zhang, Jie Bai, Meihua Bi, Xin Miao, Longsheng Li, Zidong Guo, Hao He, and Weisheng Hu
Opt. Express 26(23) 30305-30312 (2018)

Net-432-Gb/s/λ PS-PAM transmission based on advanced DSP and single DAC for 400 G/λ IM/DD links

An Yan, Guoqiang Li, Sizhe Xing, Wangwei Shen, Yongzhu Hu, Aolong Sun, Jianyang Shi, Ziwei Li, Chao Shen, Nan Chi, and Junwen Zhang
Opt. Lett. 49(7) 1656-1659 (2024)

C-band 100-GBaud PS-PAM-4 transmission over 50-km SSMF enabled by FIR-filter-based pre-electronic dispersion compensation

Xiong Wu, Junwei Zhang, Alan Pak Tao Lau, and Chao Lu
Opt. Express 31(11) 17759-17768 (2023)