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 Cleave 

Cleave is the homonym of its own antonym. It can mean either to split in half or to cling together.

Cleave (clove or cleft, cloven or cleft, related to German dialect klieben = spalten, split):

1. In an optical fiber, a deliberate, controlled break, intended to create a perfectly flat endface, perpendicular to the longitudinal axis of the fiber.

Note: A cleave is made by first introducing a microscopic fracture ("nick") into the fiber with a special tool, called a "cleaving tool," which has a sharp blade of hard material, such as diamond, sapphire, or tungsten carbide. If proper tension is applied to the fiber as the nick is made, or immediately afterward (this may be done by the cleaving tool in some designs, or manually in other designs), the fracture will propagate in a controlled fashion, creating the desired endface.

2. To break a fiber in such a controlled fashion.

Note: A good cleave is required for a successful splice of an optical fiber, whether by fusion or mechanical means. Also, some types of fiber-optic connectors do not employ abrasives and polishers. Instead, they use some type of cleaving technique to trim the fiber to its proper length, and produce a smooth, flat perpendicular endface.

Source: from Federal Standard 1037C


Cleave (cleaved, cleaved, related to German kleben, adhere):

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