Patent ID: 6910810

Claim:
An optical part for use in two-way optical communication which performs transmission and reception of light over a single optical fiber, comprising: converging means for converging received light from said optical fiber onto a light receiving element, said converging means having a lens half for receiving light from an end face of said optical fiber and a cut-out face in a plane parallel to an optical axis thereof; optical guide means for launching transmitting light from a light emitting element into said optical fiber, said optical guide means having a transmitting prism formed integrally with said converging means on the cut-out face; wherein said converging means and said optical guide means are disposed adjacent each other so that a surface region of said optical guide means dedicated for emitting said transmitting light from said optical guide means to said optical fiber is adjacent a surface region of said converging means dedicated for receiving light from the optical fiber by said converging means; and wherein said transmitting prism has a first surface which is opposite a face joined to said cut-out face and on which said transmitting light is incident, a second surface opposing the end face of said optical fiber and a third surface for reflecting said transmitting light incident thereon from said first surface toward said second surface.