Patent ID: 8447152
Filing Date: 2013-05-21
Classification: G02B

Abstract:
1. A waveguide coupling device with properties of forward coupling and backward coupling, comprising: a substrate; at least one inverted taper coupling structure, being formed on the substrate for confining and propagating an optical wave in the inside thereof; an intermediate layer, being formed on the substrate and covering the inverted taper coupling structure; and at least one three-dimensional taper coupling structure, being formed on the intermediate layer and used for connecting to an external fiber by one terminal thereof, so as to couple the optical wave transported by the fiber; wherein the refractive index of the intermediate layer is very close to the refractive index of the three-dimensional taper coupling structure, therefore, the optical wave would regard the intermediate layer and the three-dimensional taper coupling structure as the identical material when propagating in the three-dimensional taper coupling structure, such that the optical wave may be coupled into the inverted taper coupling structure through the intermediate layer.