LED to Fiber Coupling

• 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,

                                                      … (4.6.1)

                                                 … (4.6.2)

where,

P_in is optical power launched into fiber. P_s is total source output power.

τ_x is directional coupling efficiency in parallel direction.

τ_y is directional coupling efficiency in perpendicular direction.