How to connect the plastic parts of a fiber optic patch cord

Fiber optic patch cords are connected by carefully assembling the connector housing, ferrule, and fiber cable, ensuring precise alignment for optimal signal transmission.

Understanding the Components

A typical fiber optic patch cord consists of three main parts: the fiber optic cable, the connector housing (plastic part), and the ferrule that aligns the fiber core . The plastic housing protects the ferrule and provides a secure interface for plugging into devices. Duplex connectors often have two fibers side by side in a single plastic assembly, while simplex connectors carry a single fiber .

Step-by-Step Connection Process

1. Prepare the Fiber: Strip the outer jacket of the fiber cable carefully to expose the bare fiber without damaging it. Remove any Kevlar strands or buffer coating as needed .
2. Insert the Fiber into the Ferrule: Slide the stripped fiber into the ferrule until the fiber tip reaches the end. The ferrule ensures precise alignment of the fiber core for low insertion loss .
3. Secure the Ferrule in the Housing: Place the ferrule into the plastic connector housing. Depending on the connector type (LC, SC, ST, FC), this may involve snapping, sliding, or lightly pressing the ferrule into place .
4. Lock the Housing: Some connectors have a locking mechanism or clip to hold the ferrule securely. Ensure the housing is fully seated and the fiber does not move .
5. Polish or Inspect the Fiber End: For pre-terminated connectors, the ferrule tip is already polished. If assembling manually, polish the fiber tip to remove scratches and ensure smooth light transmission .
6. Test the Connection: Use an optical power meter or visual fault locator to verify that the fiber is transmitting light correctly and that the connection is stable .

Tips for Duplex Cables

• Duplex cables often have a zip cord design, where two fibers are joined in a single plastic jacket. You can separate them if needed for simplex connections, but ensure the fibers remain properly aligned in the connector housing .
• Maintain polarity: the transmit (Tx) end of one fiber should connect to the receive (Rx) port of the other device to ensure proper data flow .

Tools and Kits

• Fiber stripper and cleaver
• Connector assembly kit (e.g., Corning Uni-Cam for LC, SC, or ST connectors)
• Polishing film or pre-polished connectors
• Visual fault locator or optical power meter for testing By carefully following these steps, the plastic parts of a fiber optic patch cord can be connected securely, ensuring low signal loss and reliable network performance. Proper handling and alignment are critical to avoid damage to the fiber core and maintain optimal transmission.