Abstract
The invention relates to a waveguide coupling element with forward and backward coupling properties and a manufacturing method thereof. The waveguide coupling element with the forward and backward coupling properties comprises a base layer, at least one backward-coupling layer, a medium layer and at least one forward-coupling layer, wherein one end of the forward-coupling layer can be connected with an external optical fiber to couple light waves transmitted by the optical fiber; and the light waves can be efficiently coupled into the backward-coupling layer in a coupling order from the forward-coupling layer to the medium layer to the forward-coupling layer, and are limited to be transmitted in the backward-coupling layer. Furthermore, with the adoption of the manufacturing method, the waveguide coupling element with the forward and backward coupling properties can be manufactured in a large scale with low cost by using the conventional semiconductor process.