Optical transmission module, electronic device, and method for manufacturing optical transmission module

An optical transmission module comprising:

• an optical module section comprising at least one of a reception module for converting an optical signal transmitted by an optical wiring to an electric signal or a transmission module section for converting the electric signal to the optical single and transmitting the optical signal through the optical wiring;
• a circuit substrate comprising an electric wiring for transmitting the electric signal;
• and
• a connecting section comprising an external connection terminal for providing the electric signal to the optical module section and the circuit substrate,
• wherein the optical module section and the connecting section being mounted on a same substrate surface of the circuit substrate,
• wherein the circuit substrate further comprises a bending portion bent so that the substrate surfaces oppose each other at the back in a normal direction,
• wherein the bending portion is arranged between the optical module section and the connecting section,
• wherein the optical module section and the connecting section are arranged in a normal direction of the circuit substrate due to the bend at the bending portion,
• wherein a plate-shaped reinforcement section for reducing an electrical coupling between the optical module section and the connecting section is arranged in a gap portion formed by the back surfaces of the substrate surfaces,
• wherein the reinforcement section comprises a three-layer structure in which a dielectric layer made of a dielectric body, and two metal layers made of metal for sandwiching the dielectric layer are stacked in the normal direction,
• wherein a first metal layer mostly arranged on the optical module section side is not grounded, and a second metal layer mostly arranged on the connecting section side is grounded, and
• wherein the optical module section comprises:
• an optical element for receiving the optical signal transmitted through the optical wiring or emitting the optical signal to the optical wiring;
• a control unit for amplifying the optical signal received by the optical element or driving the light emission of the optical signal to the optical wiring;
• and
• an optical element wiring for connecting the optical element and the control unit,
• wherein a distance in the normal direction of the first and second metal layers is longer than a distance in the normal direction of the first metal layer and the optical element wiring.