Patent ID: 6968109

Claim:
An optical interconnection circuit board for guiding an optical signal, comprising: a substrate having a surface; a first clad layer having a flat surface, which is formed on the surface of the surface; a core layer configured to guide the optical signal in a predetermined direction, formed on the flat surface of the first clad layer and extended in the predetermined direction; a second clad layer formed on the core layer; a first termination mirror segment having a first tip end and a first mirror face configured to reflect the optical signal guided in the core layer through the second clad layer to the outside thereof, the first termination mirror segment being formed on the flat surface of the first clad layer and extending across the core layer in a lateral direction crossing the predetermined direction, the first tip end contacting the second clad layer, and the first mirror face being contacted to the core layer; a second termination mirror segment having a second tip end and a second mirror face configured to reflect the optical signal into the core layer, the optical signal being incident on the second mirror segment from the outside of the circuit board through the second clad layer, the second mirror segment being formed on the flat surface of the first clad layer and extending across the core layer in the lateral direction, the second tip end contacting the second clad layer, and the second mirror face being contacted to the core layer; a first splitting mirror segment having a third mirror face configured to reflect a part of the optical signal guided from the second termination mirror segment through the second clad layer to the outside thereof and to allow the remaining optical signal to pass over the first splitting mirror segment, the first splitting mirror segment being formed on the flat surface of the first clad layer between the first and second termination mirror segment, and the third mirror face being contacted to the core layer; and an electric circuit configured to generate an electrical signal, wherein each of the first and second terminating mirror segment and the splitting mirror segment is made of electric conductive metal and is electrically connected to the electric circuit.