OPGW cables are typically spliced using fusion splicing, following careful preparation, safety measures, and post-splice testing to ensure both optical and grounding functions remain intact.

Overview of OPGW Splicing

OPGW (Optical Ground Wire) combines optical fibers with grounding wires, so splicing must preserve both optical transmission and electrical grounding. The splicing process generally involves fusion splicing, which permanently joins fiber ends with minimal signal loss, though mechanical splicing may be used for temporary connections or quick repairs .

Step-by-Step Splicing Procedure

1. Safety Preparation

• Establish an equal potential zone using temporary ground cables to prevent electrical hazards.
• Use protective equipment such as removable hot-sticks, conductive mats, gloves, and face shields .
• Ensure the work area is stable, especially when working on towers or in windy conditions. 2. Cable Preparation
• Stretch the OPGW cable over at least 2–2.5 meters and mark the section to be stripped .
• Wrap tape around the cable at the marking point to secure wires during cutting.
• Carefully remove the aluminum and steel strands using a metal saw or mini grinder, first the outer strands, then the inner strands.
• If the fibers are in metal loose tubes, ensure the inner strands are slightly longer than the outer strands to expose the tubes for splicing . 3. Fiber Access and Splicing
• Expose the optical fibers by removing protective tubes.
• Perform fusion splicing using a fusion splicer, which aligns and fuses the fiber ends with an electric arc, resulting in low attenuation (~0.1 dB) and minimal back reflection .
• For temporary or quick connections, mechanical splicing can be used, which aligns fibers with an index-matching gel, though it has slightly higher loss (~0.3 dB), . 4. Sealing and Protection
• Cover the splice with a heat-shrink sleeve or protective closure to prevent environmental damage.
• Install the splice assembly into an optical closure to secure the fibers and maintain mechanical integrity . 5. Testing and Verification
• Use an OTDR (Optical Time-Domain Reflectometer) to measure attenuation before and after splicing.
• Verify that both optical performance and grounding continuity are intact .

Best Practices

• Perform splicing on the ground whenever possible to reduce risk and improve accuracy .
• Protect the work area from wind, dust, rain, and extreme temperatures.
• Only experienced personnel should handle splicing kits and OTDR equipment.
• Maintain meticulous handling to avoid fiber damage, which can compromise network performance . By following these steps, OPGW splicing ensures a reliable, low-loss optical connection while preserving the cable's grounding function, which is critical for high-voltage transmission networks.