Multi-channel data and clock transmission system based on Free-Space Optical communication

The Circular Electron-Positron Collider (CEPC), a pivotal platform led by Chinese scientists for producing high-purity, high-energy Higgs bosons, requires back-end readout electronics in its vertex detector to achieve high-data-rate transmission and high-precision clock synchronization while minimizing material mass. To address this requirement, this study proposes a multi-channel free-space optical (FSO) communication system based on wavelength division multiplexing (WDM). The performance of the proposed system has been experimentally validated in a laboratory environment. Experimental results demonstrate a maximum data transmission rate of 118 Gbps over 1.5 meters, with multi-channel clock synchronization achieving sub-nanosecond accuracy and synchronization precision of within 20 picoseconds.