Radiation angle
Half the vertex angle of the cone of light emitted at the exit face of an optical fiber / From Wikipedia, the free encyclopedia
In fiber optics, the radiation angle[1] is half the vertex angle of the cone of light emitted at the exit face of an optical fiber.
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The cone boundary is usually defined (a) by the angle at which the far-field irradiance has decreased to a specified fraction of its maximum value or (b) as the cone within which there is a specified fraction of the total radiated power at any point in the far field.