Zuo Mingqing, Qiao Gang, Yang Yu, Long Chengbin, Ge Dawei, Wang Dong, Li Yunbo, Chen Zhangyuan, Zhang Dechao, Li Han, Li Juhao
Opt Lett. 2024 Sep 1;49(17):4887-4890. doi: 10.1364/OL.533610.
The understanding of nonlinear propagation effects in low-crosstalk few-mode fiber is crucial for a weakly coupled mode-division multiplexed system. In this Letter, we report the first, to the best of our knowledge, experimental verification of the advantage of intramodal dispersion on mitigating intramodal cross-phase modulation in a weakly coupled few-mode fiber transmission. The experimental system is established over a 70-km multiple-ring-core few-mode fiber accommodating 6 linearly polarized modes, based on which the influences of intramodal cross-phase modulation on transmission performances of each linearly polarized mode are evaluated. Experimental results show that the intramodal cross-phase modulation of degenerate linearly polarized modes with much larger intramodal dispersion values are significantly weaker than those of non-degenerate linearly polarized modes, in which the maximum suppression of intramodal cross-phase modulation noise is up to 9.7 dB. We believe that this work would be beneficial to practical applications of weakly coupled mode-division multiplexing technologies.
理解低串扰少模光纤中的非线性传播效应对于弱耦合模分复用系统至关重要。在本信函中，据我们所知，我们首次通过实验验证了在弱耦合少模光纤传输中，模内色散在减轻模内交叉相位调制方面的优势。实验系统基于一根70公里长、容纳6个线偏振模的多环芯少模光纤搭建而成，据此评估了模内交叉相位调制对每个线偏振模传输性能的影响。实验结果表明，具有大得多的模内色散值的简并线偏振模的模内交叉相位调制明显弱于非简并线偏振模，其中模内交叉相位调制噪声的最大抑制高达9.7分贝。我们相信这项工作将有助于弱耦合模分复用技术的实际应用。
