The fiber optic cable used for patch cords is called a fiber optic patch cable, also known as a fiber jumper or fiber patch cord.

A fiber optic patch cord is a short, flexible optical cable with connectors on both ends, designed for rapid and convenient interconnections between network devices such as transceivers, switches, patch panels, and servers . Unlike backbone trunk cables, patch cords are intended for short-distance connections within data centers, telecom networks, or local area networks, and they are frequently handled during network maintenance .

Structure and Components

Patch cords consist of:

• Core: High refractive index glass that transmits light signals. Single-mode cores are typically 9 µm in diameter, while multimode cores are 50 or 62.5 µm .
• Cladding: Surrounds the core with a lower refractive index to reflect light back into the core, minimizing signal loss .
• Strength Members: Aramid yarn (Kevlar) provides tensile strength and protects the fiber from physical stress .
• Outer Jacket: Protective layer made from materials like PVC, LSZH, OFNR, or OFNP, chosen based on fire safety and installation environment .

Types and Applications

• Single-mode fiber (SM): Yellow jacket, blue connectors, suitable for long-distance or backbone links .
• Multimode fiber (MM): Orange, aqua, or lime green jackets with cream or black connectors, used for short-distance, high-speed intra-data center connections .
• Connector Types: Common standards include LC, SC, ST, FC, MPO, and others, selected based on device compatibility and density requirements . Patch cords are essential for connecting optical devices, performing cross-connects, and enabling flexible network configurations. They are distinct from pigtails (connector on one end only) and trunk cables (multi-fiber backbone cables) and are critical for maintaining signal integrity and network performance .