Time-Frequency Transfer Performance of Wavelength Selection Switch in Optical Fiber Communication Network

Xiaofeng, 熊晓锋 Xiong; Fei, 杨飞 Yang; Youzhen, 桂有珍 Gui; Haiwen, 蔡海文 Cai; Jue, 苏觉 Su; Zuqing, 朱祖勍 Zhu

doi:10.3788/cjl201845.0106003

Cited by 1 publication

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“…The switch reconfiguration function of the network is demonstrated by dynamically selecting the signal transmission path of node 4 through the optical switch. The switch adopts a silicon-based liquid crystal wavelength selection switch [20,21], which can support the continuous switching of time-frequency continuous analog signals. Here, the optical switch is controlled by software to select two paths alternately, and the phase lock error signal is monitored in real-time at the two upper nodes (node 2 and node 5) of node 4.…”

Section: Network Switching Reconfiguration Functionmentioning

confidence: 99%

High-precision time–frequency synchronization in Ethernet communication networks

Shi¹,

Yang²,

Cao³

et al. 2023

Laser Phys. Lett.

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Currently, many applications require not only high-speed communication, but also high-precision time–frequency synchronization. However, the simultaneous transmission and exchange of digital time signals with continuous analog frequency signals face challenges in large-scale Ethernet networks. Here we report a method to converge high-precision time–frequency synchronization and communication in fiber-optic distributed Ethernet networks. The time–frequency signals are multiplexed by wavelength division to the communication data with different optical wavelengths. The transmission error of the time–frequency signals was measured and controlled using a round-trip method. Network switching is implemented by add-drop multiplexing with a continuous wavelength selector switch and IP packets for the frequency signal and communication data, respectively. Experimental verification is carried out in a five-node network. In this network, high-precision time–frequency synchronization in Ethernet communication networks is realized. The frequency instability is less than 3 × 10−14@1 s, and the time synchronization offset is less than 70 ps with the communication rate of 1.25 Gbps. These results demonstrate the broad application prospects of the proposed method in distributed coherent detection fields with multiple nodes.

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Section: Network Switching Reconfiguration Functionmentioning

confidence: 99%