A semiconductor photonics device may include a photonic integrated circuit and may be coupled with an output optical fiber at a top surface of the semiconductor photonics device. To facilitate coupling of modulated optical signals to the output optical fiber at the top surface of the semiconductor photonics device, the semiconductor photonics device may include a mirror structure that is supported by a semiconductor support structure included in the semiconductor photonics device. The mirror structure may be positioned at an angle relative to a surface of a semiconductor substrate of the semiconductor photonics device, which enables the mirror structure to transfer a modulated optical signal propagating in a first direction to a second direction toward the output optical fiber.