How to Fix a Cut Fiber Optic Cable

While a cut or damaged fiber optic cable can temporarily take your network down, it is possible to quickly fix the cable with the right tools. This How.com.vn article will teach you how to splice a cut fiber optic cable back together with a fiber optic stripper and cutter and a fiber optic crimper.

Things You Should Know

Trim off any frayed or damaged ends of the cable. Strip the plastic coating off of the cut ends until you have enough wire exposed to fit into a metal terminal.
Insert the stripped ends into the metal terminals. Crip the terminals using a fiber optic crimper.
Use an inline connector to connect the crimped metal terminals. Then, add the inline connector's plastic cover into place.

Part 1

Part 1 of 2:

Cutting and Stripping the Cable

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1
Inspect the cut ends for damage. Look at each cut end of the cable and see if there are tears in the outer coating or exposed and frayed optical fibers. This will allow you to determine where you need to cut the ends of the cable before you splice them back together.^{[1]XResearch source}
- Note that fiber optic cables usually have an orange or brown outer coating, which lets you identify them when they are part of a bundle of different cables.
2
Trim off any damage from the cut ends of the cable with a fiber optic cutter. Place 1 end of the cable in the jaws of a fiber optic cutter so that they will cut the cable just below any damage. Squeeze the handles of the tool until it cuts all the way through the cable and the damaged end falls off. Repeat this for the other end of the fiber optic cable.^{[2]XResearch source}
- This will give you clean, undamaged ends of the fiber optic cable that can be spliced together to make it work again.
- If your fiber optic cable already has clean cuts and the ends are undamaged, you don’t have to cut the cable again.
Tip: If you have a damaged or broken fiber optic cable that isn’t cut all the way through, you can cut out the damaged section, then follow the rest of this same process to splice the cut ends back together.
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3
Strip the cut ends to expose enough wire to fit into a metal terminal. Hold 1 cut end of the cable up next to a metal terminal to see how much of the cable coating you need to strip off. Place the cut end that far into the strip head of a fiber optic stripper, then squeeze the handles of the stripper and pull the cable out to remove the outer coating. Repeat this for the other end of the cable.^{[3]XResearch source}
- A metal terminal is a round metal piece that you can crimp onto the ends of a cut fiber optic cable in order to splice them together.

Part 2

Part 2 of 2:

Splicing the Cable Back Together

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1
Insert the stripped ends into metal terminals. Slide 1 cut, stripped end of the fiber optic cable all the way into a metal terminal until it won’t go any further and you can see the end of the cable at the other side of the terminal. Repeat this for the other cut, stripped end of the cable.^{[4]XResearch source}
- If you can’t get the fiber optic cable all the way into the terminal, strip off a little bit more of the outer coating until you can.
2
Crimp the metal terminals onto the ends of the cable. Insert 1 of the metal terminals all the way into a fiber optic crimper. Squeeze the handles of the crimper to crimp the terminal onto the cable. Repeat this for the other metal terminal on the other cut end of the cable.^{[5]XResearch source}
- This will attach the metal terminals securely to the cut ends of the cable, so they can be used to splice the cable back together.
3
Slide the crimped metal terminals into an inline connector. Push 1 of the crimped metal terminals all the way into the hole on 1 side of an inline connector until you hear it click into place. Repeat this for the crimped metal terminal on the other cut end of the cable.^{[6]XResearch source}
- An inline connector is a rectangular plastic box that has a hole at either end, into which you can slide metal terminals to splice 2 ends of a fiber optic cable together.
4
Snap the inline connector’s cover into place to secure the cable ends together. Press the plastic rectangular cover onto the inline connector. Push it all the way on until it snaps into place.^{[7]XResearch source}
- This will keep the ends of the cut fiber optic cable inside the inline connector, so they cannot be pulled out.

Expert Q&A

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How do you fix a cut cable wire outside?
James Hornof
Master Electrician
James Hornof is a Master Electrician and the Owner and President of B & W Electric based in Denver, Colorado. With over two decades of experience in the electrical construction industry, James specializes in field installation, management, estimating, and design. He graduated top of his class in electrical trade school and studied Business Management at The Community College of Denver. James holds a Master Electrician license in Colorado, Wyoming, and Texas.
James Hornof
Master Electrician
Expert Answer
Use heat shrink! If the cables aren't cut all the way in half, de-energize the circuit, make sure the circuit is off, cut the circuit, finish cutting the cable in half so it's separate, and pull your heat shrink over one side of it. Then, make sure that your conductors are matched color-to-color before splicing them back together. Bring the heat shrink back over, and use a heat gun to give the heat shrink a good, solid, airtight, and watertight grip around the cable. At that point, you can re-energize your circuit.
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Tips

There is also a machine called a fusion splicer that joins cut fiber optic cable ends together using heat, but these machines cost thousands of dollars and require special training to operate them, so they are not practical for fixing the odd cut fiber optic cable.
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Warnings

Always use a fiber optic cutter to cut fiber optic cables or you can end up damaging the cable even more. As an alternative, you can use kevlar shears, which are high-precision shears that can cut efficiently through fiber optic cable without damaging it.
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Fiber optic cable is very complex. Make sure you know what you're doing before cutting it.
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