Photoelectric Separation Junction Box Fiber Fusion Principle

A photoelectric separation junction box isolates electrical and optical signals in a submarine or terrestrial cable system while enabling safe fiber fusion for signal transmission.Principle of Photoelectric SeparationA photoelectric separation junction box is designed to handle photoelectric composite cables, which carry both electrical power and optical signals. The box separates the high-voltage copper layer from the bare optical fibers, allowing simultaneous power supply and optical signal transmission without interference. The copper layer of the cable is connected to a power taking block, which safely conducts electricity to the system, while the bare optical fibers are routed to a fiber fusion disc for splicing and testing (CN210779959U) . Key features include:Insulation and safety: The electrical components are insulated from the box body using insulator seats and covers, maintaining a safe distance to prevent high-voltage hazards.Continuous operation: Engineers can perform fiber fusion without cutting off the power supply, ensuring uninterrupted system operation.Environmental protection: The box provides lightning protection, corrosion resistance, and sealing to maintain fiber transmission quality under harsh conditions .Fiber Fusion PrincipleFiber fusion splicing is the process of joining two optical fibers by melting their ends together, typically using an electric arc. This creates a continuous optical path with minimal signal loss and high return loss. The process involves:Preparation: Stripping the fiber coating and cleaning the bare fiber ends.Alignment: Precisely aligning the fiber cores to ensure maximum light coupling.Fusion: Applying an electric arc to melt the fiber ends, forming a permanent joint.Protection: Coiling the fused fiber in a fiber-melting disc or protective sleeve to prevent mechanical stress and maintain signal integrity . The fusion process ensures low insertion loss and high reliability, which is critical for long-distance optical communication in submarine or terrestrial networks. For multimode fibers, mode mismatch and bending can affect losses, while single-mode fibers require precise core alignment to minimize coupling loss .Integration in Junction BoxesIn a photoelectric separation junction box:The bare fibers are fused and coiled in the fiber-melting disc.The copper layer continues to supply high voltage to the system.The box allows maintenance and testing without interrupting power, improving operational safety and efficiency . This combination of photoelectric separation and fiber fusion enables reliable, high-capacity optical communication while maintaining electrical power distribution, making it essential for submarine research, offshore resource monitoring, and other long-distance optical networks.