▎ 摘　　要

NOVELTY - The coupler (100) has a light emitting source (10) whose pin is connected to a signal input terminal to receive a signal transmitted by the signal input terminal. A light receiver (20) and can receive the light and generate a photocurrent. An insulating layer is located between the light emitting source and the light receiver to isolate the light source and the light receiver. The insulating layer including epoxy resin. A cladding layer is provided between the light emitting source and the insulating layer or between the light receiver and the insulating layer. The graphene oxide can be converted into graphene by heating when the photocoupler is soldered to a circuit board. The graphene can absorb the light emitted by the light source to reduce the increase of the photoelectric conversion coefficient after welding. USE - Photoelctric coupler. ADVANTAGE - The photoelectric coupler can realize low photoelectric conversion rate shift. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a manufacturing method of a photoelctric coupler. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of photoelctric coupler. Light emitting source (10) Light receiver (20) Coating (31) Photoelectric coupler (100)