With the continuous improvement of industrial automation level, traditional cables are difficult to meet the needs of industrial secondary control systems for high reliability and low latency signal transmission due to strong electromagnetic interference, short transmission distance, high bit error rate and other problems in signal transmission. To this end, this paper introduces fiber optic transmission technology and designs a long-distance and high-reliability signal transmission solution based on fiber optics for the key pain points in the transmission of status display signals of instrument landing systems (ILS) in industrial sites, especially airport towers. This solution collects control signals through a microcontroller, combines the optoelectronic conversion module with the link status monitoring mechanism, and realizes all-optical signal transmission while enhancing the system's anti-interference and fault self-recovery capabilities. Experiments show that at 10kHz, the error of the remote output waveform is 2.1%; when the frequency is increased to 50kHz, the error is 3.5%; even at a high frequency of 100kHz, the error is still controlled within 4.8%, which meets the system's set error tolerance standard of less than or equal to 5%. The system's transmission accuracy and linear response capability in multiple frequency bands fully demonstrate its feasibility and reliability in transmitting high-fidelity signals in industrial control environments.

Chunwei Wang, Guoqiang Zhang, Xianqing Zong. Innovative Application of Fiber Optic Transmission in Industrial Secondary Control and Instrument Signal Transmission. International Journal of Frontiers in Engineering Technology (2025), Vol. 7, Issue 3: 71-77. https://doi.org/10.25236/IJFET.2025.070310.

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