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glossary

Lambertian light source: light source with a constant radiance (or luminance) whichever the direction
Multimode fiber optic: fiber optic enabling the propagation of several transverse modes
Core: central part of a fiber optic in which lightwaves are guided
Fiber optic: long cylindrical optical component guiding light
Numerical aperture ( fiber optics ): dimensionless number characterizing the acceptance cone angle of an optical fiber
Radiance ( radiometry ): for a light source or a diffusing/reflecting surface, power emitted per unit of solid angle and per unit of apparent area
Coupling efficiency ( fiber optics ): ratio between the optical power emitted by a source and the optical power effectively injected in a fiber optics