▎ 摘　　要

NOVELTY - The device has a core through which the laser travels. A clad is wrapped around the core. A graphene layer (15) interacts with the laser and prevents a laser spectral component having energy that is equal to or less than a threshold in the laser from passing through. The graphene layer is formed on a surface of a groove of the clad (13) to expose unit of the laser field radially centered at core. The core includes a first core and a second core, in which the first core and the second core are spaced apart from each other. The clad includes a first clad and a second clad, and the graphene layer is formed between the first core and the second core. USE - Optical device for suppressing noise of laser used in optical signal processing using graphene. ADVANTAGE - Obtains high accuracy with low power consumption without additional amplification by using the noise suppressor. Realizes an extinction ratio desired by the user without using an electronic device in which the extinction ratio of the output signal requires additional energy supply or additional energy consumption. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following: (1) a digital optical signal generation system; and (2) an optical fiber pulse laser. DESCRIPTION OF DRAWING(S) - The drawing shows the cross-sectional view of a noise suppressor. Component (11) Clad (13) Groove (14) Graphene layer (15) Noise suppressor (100)