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How to make a test cable for fiber optic patch cords

Fiber and communications infrastructure knowledge brief Published 09 Feb 2024

Prepared for preliminary research by the METRA knowledge desk. Confirm optical interfaces, port or core capacity, electrical input and output, enclosure protection, thermal design and installation limits against current standards and product documentation.

A fiber optic test cable is made by precisely cutting, terminating, and testing a fiber patch cord to ensure low insertion loss, correct polarity, and clean connectors.

Materials and Tools Needed

Fiber optic cable (single-mode or multi-mode depending on your network)Connectors (LC, SC, FC, or MPO/MTP)Epoxy or adhesive for connector ferrulesPolishing tools and polishing filmsFiber cleaverAlcohol wipes and lint-free clothsOptical loss test set (OLTS) or power meter and light sourceMicroscope or inspection tool for connector end facesCable cutting machine or scissors, tape measure, and cable tiesStep-by-Step Process1.

Cable Preparation

Cut the fiber optic cable to the desired length, adding a small extra length for handling and termination. Strip the outer jacket and buffer coating carefully to expose the bare fiber without causing scratches or micro-cracks. Clean the exposed fiber with alcohol to remove dust and residues.

2.

Connector Termination

Inject epoxy into the connector ferrule and insert the cleaned fiber into the ferrule. Cure the epoxy in an oven or according to the connector manufacturer's instructions to secure the fiber. Assemble the connector housing and strain relief boot.

Polish the ferrule end-face using appropriate polishing films and machines to achieve a smooth, flat surface. Inspect the end-face under a microscope to ensure there are no scratches, contamination, or defects. 3.

Testing the Patch Cord

Use an optical loss test set (OLTS) or a power meter and light source to measure insertion loss (IL) and return loss (RL). Perform polarity testing to ensure the transmitting (TX) and receiving (RX) ends are correctly aligned. For high-density or MPO/MTP cables, follow standard polarity methods to verify correct fiber mapping.

Reverse the cable and test the other end to confirm consistent performance. 4.

Final Verification

Ensure the measured IL and RL values meet industry standards for your fiber type and connector. Label the test cable with length, fiber type, and serial number for traceability. By following these steps, you can create a reliable test cable for fiber optic patch cords that ensures accurate testing of network connections, minimizes signal loss, and maintains proper polarity.

Proper cleaning, polishing, and testing are critical to avoid weak links in the network.

How to make a test cable for fiber optic patch cords - METRA FIBER MARKET [PDF]

How to make a test cable for fiber optic patch cords
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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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