Experimental Assessments of Physical Clock Distribution-Enabled Picoseconds Time Synchronization for Optical Switching Networks

doi:10.1109/JLT.2025.3586672

	Experimental Assessments of Physical Clock Distribution-Enabled Picoseconds Time Synchronization for Optical Switching Networks
	Zhao, Yisong 1; Xue, Xuwei 1; Guo, Bingli 1; Dang, Daohang 1; Zhang, Xinchi 1; Yang, Changsheng 1; Guo, Yuanzhi 1; Zhang, He 2; Wei, Buzheng 2; Li, Wenzhe 3; Meng, Lingyu 1; Shen, Shikui 2; Huang, Shanguo 1; Yuan, Guojun 3
	2025-09-01
发表期刊	JOURNAL OF LIGHTWAVE TECHNOLOGY
ISSN	0733-8724
卷号	43 期号:17 页码:8208-8214
摘要	The rapid development of artificial intelligence training traffic has fueled significant interest in optical switching network deployment in intelligent computing and data centers with high switching capacity and low power consumption. Considering flexibility and switching efficiency, the time-slotted optical packet switches are broadly deployed for flexible transmission. However, these implements are facing two key challenges in improving bandwidth utilization. Firstly, the time synchronization accuracy directly affects the time-slots alignment, where coarse alignment results in a longer protection gap between optical packets. Such extensions deteriorate the bandwidth utilization. Secondly, the precision of the time synchronization affects time-slot alignment accuracy variation. The alignment uncertainty lengthens the protection gap to guarantee the correct data transmission. To overcome limitations in accuracy and precision inherent in conventional Precise Time Protocol deployments, this paper proposed a precise and stable time synchronization scheme for optical time-slotted switching networks characterized by a physically simplified clock distribution and syntonization network, reusing the existing network connections. With the proposed synchronization method executed, the system achieves a significant accuracy at 1.48E-10 s of root-mean-square. Moreover, the time synchronization process achieves a stable performance with a variation at 3.01 E-12 s over a 10000 s observation window in the long-term examination. Furthermore, experimental results demonstrate the enhanced time-slot alignment performance with a 1.07E-7 s protection gap achieving zero packet loss in a 25 Gbps optical switching network.
关键词	Synchronization Optical switches Clocks Accuracy Optical packet switching Protection Control systems Adaptive optics Optical buffering Bandwidth Clock distribution clock syntonization optical switching network time synchronization
DOI	10.1109/JLT.2025.3586672
收录类别	SCI
语种	英语
资助项目	BUPT-China Unicom Joint Innovation Center ; National Natural Science Foundation of China[62220106002] ; National Natural Science Foundation of China[62125103] ; National Natural Science Foundation of China[62171059] ; National Natural Science Foundation of China[62401082] ; BUPT Innovation and Entrepreneurship Support Program[2025-YC-A022] ; National Key R&D Program of China[2024YFB2908303]
WOS研究方向	Engineering ; Optics ; Telecommunications
WOS类目	Engineering, Electrical & Electronic ; Optics ; Telecommunications
WOS记录号	WOS:001550800400007
出版者	IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.204/handle/2XEOYT63/41787
专题	中国科学院计算技术研究所期刊论文_英文
通讯作者	Xue, Xuwei
作者单位	1.Beijing Univ Posts & Telecommun, State Key Lab Informat Photon & Opt Commun, Beijing 100876, Peoples R China 2.China Unicom Res Inst, Beijing 100176, Peoples R China 3.Chinese Acad Sci, Inst Comp Technol, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Zhao, Yisong,Xue, Xuwei,Guo, Bingli,et al. Experimental Assessments of Physical Clock Distribution-Enabled Picoseconds Time Synchronization for Optical Switching Networks[J]. JOURNAL OF LIGHTWAVE TECHNOLOGY,2025,43(17):8208-8214.
APA	Zhao, Yisong.,Xue, Xuwei.,Guo, Bingli.,Dang, Daohang.,Zhang, Xinchi.,...&Yuan, Guojun.(2025).Experimental Assessments of Physical Clock Distribution-Enabled Picoseconds Time Synchronization for Optical Switching Networks.JOURNAL OF LIGHTWAVE TECHNOLOGY,43(17),8208-8214.
MLA	Zhao, Yisong,et al."Experimental Assessments of Physical Clock Distribution-Enabled Picoseconds Time Synchronization for Optical Switching Networks".JOURNAL OF LIGHTWAVE TECHNOLOGY 43.17(2025):8208-8214.