Overcoming laser phase noise for low-cost coherent optical communication

Xiansong Fang, Yixiao Zhu (), Xiang Cai, Weisheng Hu, Zhixue He, Shaohua Yu and Fan Zhang ()
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Xiansong Fang: Peking University
Yixiao Zhu: Shanghai Jiao Tong University
Xiang Cai: Peking University
Weisheng Hu: Peng Cheng Laboratory
Zhixue He: Peng Cheng Laboratory
Shaohua Yu: Peking University
Fan Zhang: Peking University

Nature Communications, 2024, vol. 15, issue 1, 1-12

Abstract: Abstract Artificial-intelligence-generated content has driven explosive data traffic growth in data-center interconnects. Traditional direct detection solutions struggle with limited spectral efficiency and distance, prompting the shift to coherent optics for cost-sensitive short-reach links. One specific challenge is integrating low-cost lasers while overcoming severe phase noise on high-order modulation formats. Here, we propose a residual carrier modulation scheme for precise and efficient carrier frequency and phase recovery. The residual optical carrier can continuously track phase fluctuations without redundancy compared with discrete time-domain pilots, and address the digital-to-analog convertor resolution reduction issue of frequency-domain digital pilots. In proof-of-concept experiments, we transmit a net 1-Tb/s probabilistic-shaped 256-ary quadrature amplitude modulated (PS-256-QAM) signal using a 3 MHz distributed feedback (DFB) laser. Our scheme improves bitrate by 41% compared to conventional time-domain pilots, achieving a record laser linewidth sum and symbol duration product of 6.89 × 10−5. This approach supports MHz linewidth DFB lasers in low-cost coherent optical communications.

Date: 2024
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DOI: 10.1038/s41467-024-50439-1

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