About

About
This table enables to specify the parameters of the fiber optic to be used in related calculations and in particular those concerning the coupling of light into it.

The select cell allows to define the fiber type which can be either singlemode or multimode.

Singlemode fiber optic
A singlemode fiber optic is considered to have a gaussian spatial mode which is specified by its numerical aperture (numerical aperture cell). The numerical aperture allows to calculate the spatial mode width of the fiber optic at its entrance. The numerical aperture is the sinus of the acceptance cone angle in which a given fraction of power from a gaussian beam perfectly fitting with the mode fiber is contained. This fraction of power depends on the fiber optic manufacturer and is defined in the fraction of power cell.

Multimode fiber optic
A multimode fiber optic is specified by its core diameter ( core diameter cell) and its numerical aperture ( numerical aperture cell). It is considered that all light rays hitting the core and contained in the cone defined by the numerical aperture (acceptance angle) can be coupled in the fiber optic.

Facet transmission
Whatever the fiber optic is singlemode or multimode, the entrance facet transmission can be specified in the facet transmission cell. It is the fraction of power hitting the core and contained in the acceptance angle that is effectively coupled into the fiber optic.

Whatever its type, the center of the fiber optic entrance facet coincides with the origin of the observation surface.