OPGW Fittings Low-Loss Operation Guide

Proper installation, tensioning, bending, and splicing of OPGW cables are essential to ensure low-loss optical performance.

Installation Preparation

Before installation, review the engineering drawings and plan the route, tower positions, and splice locations according to the OPGW design specifications . Ensure all equipment, including tensioners, pullers, anti-twisting counterweights, swivels, and pulley-blocks, is available and in good condition . Maintain appropriate tension during pay-off to keep the cable suspended, preventing abrasion and minimizing strain on the optical fibers .

Handling and Transport

Transport OPGW drums in a vertical position with cable ends secured to prevent slackening . Avoid dropping or uncontrolled rolling of drums, and inspect for damage before installation. Proper storage and handling reduce the risk of microbends or fiber damage that can increase optical loss .

Tensioning and Sag Control

Use the tension pay-off method and measure stringing tension at the tensioner side. Maximum stringing tension should not exceed 20% of the rated breaking strength (RBS) of the OPGW . Avoid using radius blocks, banana blocks, or array travelers that reduce contact area and can damage the cable . Maintain sag within design limits to prevent excessive bending or stress on the fibers.

Bending Radius and Fiber Protection

Always observe the minimum bending radius specified for the OPGW cable to prevent kinking or microbending of the optical fibers . Loose tube construction in OPGW allows fibers to move freely, reducing strain during installation . Avoid sharp bends at tower attachments or sheaves.

Splicing and Accessory Assembly

Plan splice locations based on drum length, tower access, and route obstacles . Use proper splice trays and closures with anti-aging gaskets to ensure environmental protection and mechanical stability . Anchoring points should secure strength members without stressing the optical fibers.

Verification and Testing

After installation, verify optical transmission characteristics using an optical time-domain reflectometer (OTDR) or equivalent testing equipment . Check for splice loss, connector integrity, and overall attenuation to ensure low-loss operation. Document results for certification and future maintenance.

Maintenance Considerations

Regular inspection of OPGW fittings, clamps, and terminations is recommended to detect mechanical wear, corrosion, or environmental damage . Proper maintenance ensures long-term low-loss performance and reliability of the fiber optic communication system. By following these guidelines—careful handling, correct tensioning, adherence to bending radius, proper splicing, and thorough testing—OPGW systems can achieve optimal low-loss operation and maintain reliable optical communication over aerial power lines.