Wang Anbang, Wang Junli, Jiang Lin, Wang Longsheng, Wang Yuncai, Yan Lianshan, Qin Yuwen
Key Laboratory of Photonic Technology for Integrated Sensing and Communication, Ministry of Education of China, Guangdong University of Technology, Guangzhou, 510006, China.
Key Laboratory of Advanced Transducers and Intelligent Control System, Ministry of Education and Shanxi Province, Taiyuan, 030024, China.
Light Sci Appl. 2025 Jan 8;14(1):40. doi: 10.1038/s41377-024-01702-z.
Common-signal-induced synchronization of semiconductor lasers have promising applications in physical-layer secure transmission with high speed and compatibility with the current fiber communication. Here, we propose an ultra-long-distance laser synchronization scheme by utilizing random digital optical communication signal as the common drive signal. By utilizing the long-haul optical coherent communication techniques, high-fidelity fiber transmission of the digital drive can be achieved and thus ultra-long-distance synchronization is expected. Experiments were implemented with distributed feedback lasers injected by a random-digital phase-modulated drive light. Results show that high-quality synchronization can be achieved as the drive signal rate is larger than the laser relaxation frequency and the transmission bit error ratio is below a critical value. Chaos synchronization over 8191-km fiber transmission was experimentally achieved. Compared to traditional common-signal-induced synchronization using analog drive signal such as chaos, the distance is increased by 8 times, and complicated hardware devices for channel impairment compensation are no longer required. In addition, the proposed method does not sacrifice communication capacity like traditional methods which need a channel to transmit analog drive signal. It is therefore believed that this common-digital-signal induced laser synchronization paves a way for secure backbone and submarine transmission.
常见信号诱导的半导体激光器同步在高速物理层安全传输以及与当前光纤通信的兼容性方面具有广阔的应用前景。在此，我们提出一种利用随机数字光通信信号作为公共驱动信号的超长距离激光同步方案。通过利用长距离光相干通信技术，可以实现数字驱动信号的高保真光纤传输，从而有望实现超长距离同步。我们采用由随机数字相位调制驱动光注入的分布反馈激光器进行了实验。结果表明，当驱动信号速率大于激光器弛豫频率且传输误码率低于临界值时，可以实现高质量的同步。通过实验实现了8191公里光纤传输上的混沌同步。与使用混沌等模拟驱动信号的传统常见信号诱导同步相比，距离增加了8倍，并且不再需要用于信道损伤补偿的复杂硬件设备。此外，所提出的方法不像传统方法那样需要一个信道来传输模拟驱动信号从而牺牲通信容量。因此，这种由公共数字信号诱导的激光同步为安全的骨干网和海底传输铺平了道路。
