Detailed Design of Optical Cable Laying Method

An optical cable laying scheme involves careful planning of routing, core selection, installation methods, and safety measures to ensure reliable fiber optic network deployment.

Planning and Preparation

Before laying optical cables, a detailed survey of the route is essential. This includes checking the routing direction, laying method, joint positions, and ground distances to plan for distribution and maintenance points. All cable sections should be studied to determine the number and type of splices, protective elements (splice boxes, distributors), and the necessary materials and machinery.

Authorization from relevant authorities is required before starting any work.

Cable Handling and Installation

Optical cables must be handled carefully to avoid damage. Cables should remain in their original drum, box, or coil until installation, and mechanical stress should be minimized. Outdoor cables often use loose tube construction, while indoor cables use tight sleeves.

Large-core fibers may be laid in strips. The bending radius should be at least 15 times the cable diameter, and during installation, at least 20 times to prevent fiber breakage. The cable reel rotation should match the laying speed, typically around 15 meters per minute.

Core Selection and Redundancy

The number of fiber cores is determined by the number of wiring points, switches, and redundancy requirements. For example, a dual-machine hot standby may require six cores: two for use, two for backup, and two for redundancy. Proper labeling and documentation of each fiber are essential for maintenance and troubleshooting.

Laying Methods

Cables can be laid in existing pipelines, ducts, or directly buried, depending on the environment. Reserved cable lengths of 5–10 meters at both ends are recommended for splicing and maintenance. Handholes or manholes should be spaced appropriately, often every 20 meters, to facilitate access.

During installation, a loose radian should be maintained at cable outlets to prevent back buckling.

Safety and Supervision

A security plan must be in place, including signaling systems and environmental measures. Staff should supervise the work before, during, and after installation to ensure quality and compliance with specifications. Protective equipment, eye protection, and proper handling of fiber scraps are critical for safety.

Testing and Quality Control

Before and after laying, optical and electrical characteristics of cables and connectors should be tested. Any abnormalities must be addressed immediately. Proper supervision ensures the long-term reliability of the fiber optic network.

Summary

A successful optical cable laying scheme integrates route planning, core selection, careful handling, proper installation methods, redundancy planning, safety measures, and rigorous testing. Following these guidelines ensures a durable, high-performance fiber optic network suitable for both indoor and outdoor environments.