• The edge emitting diodes have emission pattern full width at half maximum (FWHM) at 30 – 50o in the plane perpendicular to active – area junction and an FWHM of 5 – 10o in plane parallel to junction.
  • An angular output distribution of laser is greater than fiber acceptance angle laser emitting area is much smaller than cross-section of fiber core, spherical/cylindrical lenses can be used employed for improving coupling
  • The coupling efficiency for a surface emitting LED as a function of emitting area diameter for a fiber with NA = 20 and core radius a = 25 µm is shown in Fig. 4.7.1.