Patent ID: 8680540

Claim:
An optical semiconductor apparatus including an optical signal transmitter-receiver of a bidirectional communication system employing a single-core optical fiber, comprising: a substrate; a light-receiving device having layered structure on the substrate; a surface-emitting semiconductor laser device having a columnar structure on the light-receiving device; and a resin layer in contact with at least part of an active region of the surface-emitting semiconductor laser device, the resin layer surrounding only half of the circumference of the columnar structure on the substrate thus imparting a resin side of the columnar structure and a non-resin side of the columnar structure, wherein, the surface-emitting semiconductor laser device and the light-receiving device are monolithically integrated on the same substrate, the surface-emitting semiconductor laser device has a lower electrode that is on the resin side of the columnar structure and the light-receiving device has an upper electrode that is on the non-resin side of the columnar structure, a diameter of the surface-emitting semiconductor laser device is smaller than a diameter of the light-receiving device, and a diameter of the light-receiving device is smaller than a diameter of a core of the single-core optical fiber optically coupled with the semiconductor apparatus.