▎ 摘　　要

NOVELTY - The optical waveguide (100) comprises a substrate (110), a first dielectric layer (120) positioned on the substrate, a graphene layer (130) comprising graphene formed on the first dielectric layer along a lengthwise direction of the substrate and transmitting an incident light through the graphene, a second dielectric layer (140) positioned on the first dielectric layer and the graphene layer, a third dielectric layer positioned between the first dielectric layer and the substrate, and a fourth dielectric layer positioned on the second dielectric layer. USE - The optical waveguide is useful for a planar lightwave circuit. ADVANTAGE - The optical waveguide is fabricated using graphene in a cost-effective manner. The characteristics of waveguided light can be varied by the use of graphene thus enabling optical efficiency control and enabling efficient transmission of an optical signal. DETAILED DESCRIPTION - The optical waveguide (100) comprises a substrate (110), a first dielectric layer (120) positioned on the substrate, a graphene layer (130) comprising graphene formed on the first dielectric layer along a lengthwise direction of the substrate and transmitting an incident light through the graphene, a second dielectric layer (140) positioned on the first dielectric layer and the graphene layer, a third dielectric layer positioned between the first dielectric layer and the substrate, a fourth dielectric layer positioned on the second dielectric layer, and first and second electrode layers formed along the lengthwise direction of the substrate between the third dielectric layer and the first dielectric layer and between the second dielectric layer and the fourth dielectric layer, respectively. The first and second dielectric layers have same refractive index. A set voltage is an alternating current voltage and applied to the first and second electrode layers. The first and second electrode layers are formed in a stripe shape. The first and second electrode layers are formed such that a path is branched into two paths. The third dielectric layer has same refractive index as the first dielectric layer. The fourth dielectric layer has the same refractive index as the second dielectric layer. The graphene layer transmits an electrical signal along with an optical signal when the electrical signal is applied in a horizontal direction to one of the first electrode layer, the second electrode layer and the graphene layer. The graphene layer is formed in a stripe shape and a film shape. DESCRIPTION OF DRAWING(S) - The diagram shows a schematic cross-sectional view of an optical waveguide. Optical waveguide (100) Substrate (110) Dielectric layers (120, 140) Graphene layer. (130)