acceptance cone

A guided ray (also bound ray or trapped ray) is a ray of light in a multimode optical fiber, which is confined by the core. For step index fiber, light entering the fiber will be guided if it falls within the acceptance cone of the fiber, that is if it makes an angle with the fiber axis that is less than the acceptance angle,
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In fiber optics , the cone within which optical power may be coupled into the bound modes of an optical fiber . Note: The acceptance cone is derived by rotating the acceptance angle about the fiber axis . (188 ) [After 2196 ]

acceptance cone
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