In fiber optics, the radiation angle1 is half the vertex angle of the cone of light emitted at the exit face of an optical fiber.
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.
References
References
- "Radiation angle | antennas and accessories". interline.pl. Retrieved 2022-02-22.
- This article incorporates public domain material from Federal Standard 1037C. General Services Administration. Archived from the original on 2022-01-22. (in support of MIL-STD-188).