The present invention relates to an integrated photonic device (1) comprising an image detector (2) that comprises an array of pixels. The device further comprises an integrated waveguide (5) and a light coupler (3) comprising a light receiving part (7) optically coupled to the integrated waveguide (5) for receiving a light signal. The light coupler (3) is adapted for coupling a same predetermined spectral band of the light signal to each of a plurality of pixels of the image detector (2). The light coupler (3) comprises a tapered portion (10), in which the light coupler tapers outward in a direction of propagation, and an end part (8) comprising an elliptically shaped back reflector (13) for reflecting light propagating along the direction of propagation back through the light coupler toward the integrated waveguide (5).