How to connect a dark blue multimode fiber optic cable

A dark blue multimode fiber optic cable is typically OM1 or OM2, and connecting it requires identifying the fiber type, using compatible connectors, and following proper termination and color-coding standards.

Identify the Fiber Type

Dark blue jackets usually indicate OM1 or OM2 multimode fiber, which are designed for short-range data transmission, typically up to 1 Gb/s over 300–550 meters . Confirm the fiber type by checking the cable jacket markings or manufacturer specifications.

Choose the Correct Connector

• Connector Type: OM1/OM2 fibers commonly use LC, SC, or ST connectors.
• Polish Type: Use UPC (Ultra Physical Contact) polish for multimode fibers; avoid mixing with APC connectors, which are for single-mode fibers .
• Duplex vs Simplex: Determine if your network requires duplex (two fibers for bidirectional communication) or simplex (single fiber for one-way transmission), .

Prepare the Cable

1. Strip the Jacket: Carefully remove the outer jacket without damaging the fiber.
2. Clean the Fiber: Use lint-free wipes and isopropyl alcohol to clean the fiber end.
3. Trim the Fiber: Cleave the fiber to the correct length using a precision fiber cleaver to ensure a smooth endface.

Terminate or Connect

• Using Pre-terminated Patch Cables: Simply plug the LC, SC, or ST connector into the corresponding port on your network device or patch panel.
• Field Termination: If terminating in the field, use a fusion splicer or mechanical splice to join the fiber to a connector or another fiber. Ensure alignment and minimal insertion loss.
• Follow Color Coding: Adhere to TIA-598-C color standards to maintain proper identification and avoid miswiring. For multimode fibers, the blue jacket indicates OM1/OM2, and individual fibers inside follow a 12-color sequence for splicing or patching .

Test the Connection

After connecting, use an optical power meter or OTDR (Optical Time-Domain Reflectometer) to verify signal integrity, insertion loss, and continuity.

Safety Tips

• Avoid bending the fiber sharply; maintain the minimum bend radius.
• Always wear eye protection when handling fiber ends to prevent injury from stray light or shards.
• Keep fibers clean to prevent signal degradation. By following these steps, a dark blue multimode fiber optic cable can be safely and effectively connected, ensuring reliable network performance and compliance with industry standards .