The process of cleaving an optical fiber forms one of the steps in the preparation for a fiber splice operation, regardless of the subsequent splice being a fusion splice or a mechanical splice; the other steps in the preparation being those of stripping and fiber alignment. A cleave in an optical fiber is a deliberate, controlled break, intended to create a perfectly flat end face perpendicular to the fiber's longitudinal axis. Usually, such surfaces should be as flat. Fiber optic splitters are essential passive devices in modern optical communication systems, enabling the division of a single light signal into multiple outputs or combining multiple signals into one. The cleaving process encompasses the following requirements: The Fraunhofer IOF can cleave fibers with diameters of 125 µm to 1 mm. Like cutting a glass sheet, the fibers are cut by scoring or scratching the surface and applying stress so the glass breaks smoothly along the stress lines created by the scratches. Thus, I want to share something about the cleaving in this post today.