Optical module including a photoreception device

A photoreception device includes an oblique surface (3A) on a semiconductor substrate (3) for causing a deflection of an optical beam incident thereto and a photodetection region (7) provided on a first side of the semiconductor substrate for detecting the deflected optical beam, the photodetection region including a first electrode (8), wherein the photoreception device further includes a second electrode (11) for biasing the photodetection region an a second, opposite side of the semiconductor substrate.