Patent ID: 8098994

Claim:
An optical interconnection system that transmits and receives a three-level signal, comprising: a first optical interconnection device and a second optical interconnection device, each of the first and second optical interconnection devices transmitting and receiving a two-level signal; and a synthesizer that outputs a three-level signal by synthesizing signals received from the first and second optical interconnection devices, wherein each of the first and second optical interconnection devices includes, a light emitting unit driver to which an electrical signal is input; a light emitting unit that emits a light from the light emitting unit driver; an optical waveguide through which the light emitted from the light emitting unit is transmitted; a light receiving unit that receives light transmitted by the optical waveguide and outputs a current based on the received light; and a light receiving unit driver that outputs a voltage signal in response to the current received from the light receiving unit.