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Overfill

In telecommunication, the term overfill has the following meanings:

1. The condition that prevails when the numerical aperture of an optical source, such as a laser, light-emitting diode, or optical fiber, exceeds that of the driven element, e.g., optical fiber core.
2. The condition that prevails when the beam diameter of an optical source, such as a laser, light-emitting diode, or optical fiber, exceeds that of the driven element, e.g. optical fiber core.

Note: In optical communications testing, overfill in both numerical aperture and mean diameter (core diameter or Federal Standard 1037C