Definitions for "Acceptance angle"
Keywords:  core, cone, angle, aperture, axis
The range of an angle measured from the axis of the fiber over which light is optimally accepted from one core to another.
For optical fiber, the angle over which light entering the fiber core will be guided along the core rather than reflected off of the surface or lost through the cladding. Often expressed as the half angle of the cone. Generally measured as numerical aperture (NA).
The maximum angle at which a light ray entering the core will be guided through the fiber.