Open-wire shortwave optical cable

Open-wire shortwave optical cables are fiber optic cables designed for multimode shortwave (850 nm) transmission, often used in aerial or overhead installations like OPGW systems.

Overview

Open-wire shortwave optical cables typically use multimode fiber, which allows light to travel along multiple paths within the fiber core. Shortwave lasers operating at approximately 850 nm are used with these fibers, providing high-speed data transmission over moderate distances. The cable ends must match the laser type, as shortwave and longwave optics are not interchangeable .

Construction

These cables can be deployed in aerial, open-wire, or overhead transmission line applications. A common design is the Optical Ground Wire (OPGW), which combines the functions of a grounding wire and a fiber optic communication medium. OPGW cables feature:

• Central aluminum or steel core for mechanical strength
• Color-coded fiber optic buffer tubes for easy identification and splicing
• Tight or loose tube configurations to protect fibers from mechanical stress and environmental factors
• Outer layers of steel or alloy wires to withstand wind, ice, and electrical faults The loose tube design often contains a gel-filled channel to prevent fiber strain during installation and operation .

Applications

Open-wire shortwave optical cables are widely used for:

• Telecommunications over power transmission lines
• Data transmission in storage area networks (SANs) when multimode shortwave fiber is required
• Long-distance aerial fiber deployment where mechanical durability and environmental resistance are critical

Installation Considerations

• Proper sheave and pulley sizes must be used during installation to avoid crushing the cable
• Fiber count and environmental conditions determine whether a tight structure or loose tube configuration is preferable
• Splicing and termination are simplified by color-coded buffer tubes and pre-engineered closures

Summary

Open-wire shortwave optical cables provide a robust solution for high-speed multimode fiber transmission in aerial or overhead applications. They combine mechanical strength, environmental resilience, and optical performance, making them suitable for both telecommunications and utility infrastructure. Proper matching of shortwave optics and fiber type is essential for reliable operation .