How to identify different optical cables

Optical cables can be distinguished by core size, mode (single-mode or multimode), jacket type, installation environment, and connector type.

1. Core Size and Mode

• Single-mode (SM): Has a narrow core (~8–10 µm) that allows light to travel straight, ideal for long-distance transmission (tens to hundreds of kilometers). Typically used in backbone networks and long-haul communications .
• Multimode (MM): Has a wider core (50 or 62.5 µm) that allows multiple light paths, suitable for shorter distances (up to 2 km), commonly used in buildings, campuses, and data centers .

2. Jacket and Installation Environment

• Indoor cables: Flexible, lightweight, and often flame-retardant (PVC or LSZH). Designed for office LANs, data centers, and riser/plenum spaces. Easy to bend and install with connectors like LC .
• Outdoor cables: More robust, often armored or self-supporting, designed to withstand environmental stress, UV exposure, and mechanical damage. Used for aerial, underground, or duct installations .

3. Armored vs. Non-Armored

• Armored cables: Include metallic shielding for protection against mechanical damage, ideal for underground or industrial installations .
• Non-armored/self-supporting: Reinforced with tensile elements for aerial installation without additional support structures .

4. Light Source and Transmission

• LED light sources: Typically used for multimode fibers due to their ability to handle multiple light paths .
• Laser light sources: Used for single-mode fibers to achieve longer distances and higher precision .

5. Connectors and Color Coding

• Connectors: LC, SC, ST, and MTP/MPO connectors can indicate the intended application and fiber type .
• Jacket color: Often used to identify fiber type in multi-cable installations (e.g., yellow for single-mode, orange or aqua for multimode), .

Summary

To distinguish an optical cable, examine the core size, mode, jacket type, armoring, light source compatibility, and connector type. Indoor cables are flexible and fire-resistant, outdoor cables are rugged and armored, single-mode fibers are for long distances, and multimode fibers are for shorter runs. Proper identification ensures optimal network performance and installation safety .