Abstract
The digital-analog radio-over-fiber (DA-RoF) scheme offers a high-fidelity and spectrally efficient solution for future mobile fronthaul. However, to be implemented in the low-cost directly modulated laser with direct detection (DML-DD) link, both the digital and analog parts in DA-RoF modulation would suffer from the composite second-order (CSO) and composite triple beat (CTB) caused by the chirp–dispersion interaction. In this Letter, we propose and experimentally demonstrate a computationally efficient composite triple beat cancellation (CTB-C) algorithm for DA-RoF fronthaul in the dispersion-uncompensated C-band DML-DD link. The CSO and CTB are suppressed at the receiver-side DSP based on the theoretical model of these nonlinear distortions. In the proof-of-concept experiment, a 1.2-dB improvement in the recovered signal-to-noise ratio (SNR) is obtained with 5.5-GHz 1024-QAM orthogonal frequency division multiplexing (OFDM) signal after 10-km standard single-mode fiber (SSMF) transmission. The proposed CTB-C technique does not require the training process and performs close to the Volterra-based feed-forward equalizer (VFE) under the complexity constraint.
© 2023 Optica Publishing Group
Full Article | PDF ArticleMore Like This
Byung Gon Kim, Sung Hyun Bae, Hoon Kim, and Yun C. Chung
Opt. Express 25(11) 12152-12160 (2017)
Mingxu Wang, Jianjun Yu, Xianming Zhao, Weiping Li, Yi Wei, Xiongwei Yang, Junting Shi, Chengzhen Bian, Tangyao Xie, Feng Zhao, Jianguo Yu, Wen Zhou, and Kaihui Wang
Opt. Lett. 48(15) 3997-4000 (2023)
Jingjing Lin, Chenbo Zhang, Yixiao Zhu, Xu Liu, Weisheng Hu, Zhangyuan Chen, Weiwei Hu, and Xiaopeng Xie
Opt. Lett. 49(5) 1353-1356 (2024)