How to Cleave Optical Fiber

Optical fiber has revolutionized the telecommunications business worldwide. As a result, it is important that we gain the skills required to deal with optical fiber. Clean ends should be ensured when adopting or splicing a fiber, as everyone knows. And because cleave optic fiber is one of the most basic and important procedures in ensuring clean and smooth fiber ends, its importance cannot be overstated. This article intends to introduce some basic cleaving knowledge, common cleaving tools as well as how to cleave fiber.

fiber optical cleaver

Basics of Fiber Optic Cleaving

Fiber cleaving is one of numerous techniques used to prepare fibers for splicing. The goal of the cut is to get the fiber’s end to form a nearly perfect right angle with the fiber’s body, and the end face to be almost entirely smooth. A clean and flat end face perpendicular to the length of the fiber is generated by executing a good cutting operation, with no projecting glass at either end. Furthermore, it allows for successful low-loss fiber splicing.

The technique of Fiber Optic Cleaving

A scribe and tension or scribe and break strategy is a generic strategy using fiber cleaving techniques. The procedure involves creating cracks in the fibers with cutting tools composed of materials like diamond, sapphire, or tungsten carbide, and then applying tensile stress near the cracks.

fiber optic cleaver

Common Cleaving Tools

In fiber cutting, two types of cutting instruments are widely used: pen-shaped scriber and mechanical cleaver.

Pen-shape scribes resemble ballpoint pens, but they have a small wedge-shaped tip made of diamond or another hard substance that may be used to manually scribble fibers. The operator tugged the fiber to break it after scratching it. Both the scribing and breaking operations are controlled by hand, making them more operator-dependent and unpredictable because they require the operator to manually apply force to break the fiber. As a result, a skilled operator is required to make a good cut.


A mechanical cutter is another equipment that is extensively used because it generates better and more repeatable cuts. No specialized training is required to use this cleaver because it is easier to use. Simply place the fiber in the precise position on the cleaver. After that, force is given, and the fiber breaks cleanly at the score line.

fiber cleaver

High Precision Fiber Cleaver

How to Cleave Fiber

  1. Open the top clamp lever, the knife holder should be in the forward position.
  2. Place the fiber directly into the correct V-groove with the end of the fiber coating at the xxmm mark on the ruler.
  3. Close the cover of the single fiber adapter.
  4. Pull the top clamp lever down. Place the blade holder on the cleaver’s rear. Cleavage of fiber will occur.
  5. Pull out the top clamp lever and open it. Then lift the newly sliced fiber by opening the cover of the single fiber adapter. Scraps should be removed and properly disposed of.


As fiber splicing necessitates the butting of two fiber ends, any faults in the ends will damage the fiber splicing’s performance. It is therefore critical to appropriately split the fiber in order to accomplish good fiber splicing or termination. A decent cleaver can also make the entire chopping process go more smoothly.

Baudcom offers all types of Fiber Optic Tools. For more information, please feel free to contact us.

Post time: 2021-05-25


Lomoveishiy – Finland

I needed those to connect my PC on the third floor to have internet access in that room, and ISP installed their modem on the first floor only. After dropping fiber patch cables, plugged in all cables into these media converters at both sides, and link came up instantly. Was much easier than I thought!

Raymond – USA

Great experience – units worked straight out of the box – just needed plug in cables and we were done. I also like the possibility to enable jumbo frames, while we do not have a need for this feature at the current moment it’s great to have this option.

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