- The edge-emitting LED have Laser like output hence can launch sufficient optical power for the data rates upto 560 Mb / sec over several kilometers. Also LEDs are cost effective and
- The LED to step index fiber coupling efficiency is given by,
Pin is optical power launched into fiber. Ps is total source output power.
τx is directional coupling efficiency in parallel direction.
τy is directional coupling efficiency in perpendicular direction.