▎ 摘　　要

NOVELTY - The device (100) has a light input device (120) that is configured to receive light. The set of waveguides (130) extends from a light input device and transmitting portions of light received by the input device. A set of modulators (140) modulates phases of the portions of the light. A graphene layer (150) absorbs the transmitted portions. Two electrodes are electrically connected to the graphene layer. The graphene layer is provided on one of a top surface and a side surface of each waveguide. The modulators form a phase profile by independently modulating a phase of each portion of light transmitted in the waveguide, and modulate the phase based on applying an electric signal or heat. USE - Light detecting device for use in optical system (claimed) such as light detection and ranging (LiDAR) system for detecting light reflected from an object after being emitted from a light steering apparatus. ADVANTAGE - The light detecting device comprises a light input device that is configured to receive light, where waveguides are provided for transmitting portions of the light, and thus enables to improve the reliability of the optical system. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for an optical system. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the light detecting device. Light detecting device (100) Light input device (120) Waveguides (130) Modulators (140) Graphene layer (150)