In real-time broken rail detecting system

in order to obtain broken rail information accurately

it needs to transmit the voltage signal of the current sensor to upper computer accurately

reliably and realtime.Using the excellent characteristics of data transmission for controller area network（CAN） bus and advantage of plastic optical fiber in short distance communication

the optical fiber network of CAN bus is designed to achieve data transmission.Network topological structure suitable for broken rail detecting system is researched

a kind of communication interface circuit for the optical fiber of CAN bus is designed and the correctness is verified through the two nodes communication experiment.The transmission performance of CAN network is analyzed.The results show that using the optical fiber network of CAN bus to transmit data improves the anti-interference ability of the system.