A new co-transmission method including both energy and signals

With the expansion of underground cable projects, stable monitoring has become increasingly vital. However, the lack of an integrated solution for both power supply and communication limits long-term system reliability. This paper proposes a standardized configuration for cable monitoring equipment based on optical fiber coherent transmission technology, achieving simultaneous transmission of energy and signals under low-power conditions. Experimental results show that the proposed system improves transmission efficiency by 12–20% and enhances signal stability compared with conventional methods.