A fiber optic cable with an attached wire, known as an Optical Attached Cable (OPAC), is a fiber-optic cable installed along a host conductor, typically overhead power lines, using wrapping, lashing, or clipping methods.

What is an Optical Attached Cable (OPAC)?

An Optical Attached Cable (OPAC) is a specialized type of fiber optic cable designed to be installed along an existing conductor, such as a power line, rather than being laid independently . The fiber optic cable is physically attached to the host wire using one of several methods:

• Wrapping: The fiber cable is spirally wrapped around the host conductor as the installation equipment moves along the line. This is the most common method and was first developed in the UK (SkyWrap) and Japan (GWWOP) in the 1980s .
• Lashing: The fiber cable is tied to the host conductor using a lashing wire or cord.
• Clipping: The fiber cable is clipped directly to the host conductor using specialized hardware.

Installation Process

Installation of OPAC typically requires specialized equipment that travels along the host conductor from pole to pole or tower to tower, securing the fiber cable in place . For medium or low voltage lines close to the ground, the wrapping machine can sometimes be pulled manually. For high-voltage transmission lines, a radio-controlled power unit powered by batteries or a petrol engine is usually necessary.

Advantages and Applications

• Efficient use of existing infrastructure: OPAC allows fiber deployment without the need for separate poles or underground conduits.
• Telecommunications integration: Commonly used for high-speed data transmission along power lines, enabling broadband, internet, and utility communication networks.
• Global adoption: Wrapped cable systems have been installed on every continent except Antarctica, demonstrating their reliability and versatility .

Comparison to Standard Fiber Optic Cables

Unlike standard fiber optic cables, which are installed in conduits, ducts, or directly buried, OPAC is mechanically attached to a host wire, which reduces installation costs and leverages existing infrastructure . Standard fiber optic cables are available in single-mode or multi-mode types, suitable for indoor, outdoor, or long-distance applications, but they require separate support structures or pathways .

Summary

A fiber optic cable with an attached wire is essentially an OPAC, designed for deployment along existing conductors using wrapping, lashing, or clipping. It is widely used in telecommunications and utility networks to provide high-speed data transmission while minimizing the need for additional infrastructure. Installation requires specialized equipment, and the system is highly adaptable for both low and high-voltage lines .