Patent ID: 8718424

Claim:
An optical signal transmission device, comprising: a substrate having a first loading surface and a second loading surface opposite to the first loading surface; an optical coupling element positioned on the first loading surface and comprising: a first cladding portion; and a plurality of coupling lenses extending through the first cladding portion, each of the coupling lenses having a first sloped surface and a second sloped surface, both of the first sloped surface and the second sloped surface extending out of the first cladding portion; an optical fiber module positioned on the first loading surface and comprising: a second cladding portion; and a plurality of fiber cores extending through the second cladding portion, each of the fiber cores having a bare end, the bare end optically coupled with the respective second sloped surface; a plurality of light emitting modules positioned on the second loading surface, each of the light emitting modules spatially corresponding to the respective first sloped surface; and a pressing pole pressing each bare end to the respective second sloped surface; wherein a refractive index of the substrate is n 1 , a refractive index of the coupling lens is n 2 , a refractive index of the fiber cores is n 3 , a refractive index of the air is n 0 , and n 3 >n 2 >>n 1 >n 0 >0.