▎ 摘　　要

NOVELTY - Producing physically contactable graphene electro-optic modulator, comprises (a) forming a first metal electrode and a second metal electrode on an oxide film formed on a substrate, where the first metal electrode and the second metal electrode are formed spaced apart from each other, (b) synthesizing the first graphene film on the metal thin film, (c) coating the first graphene film with a first polymer film which is formed on surface of the first graphene film to face the metal thin film, (d) removing the metal thin film synthesized with the first graphene film, and (e) transferring the first graphene film coated with the first polymer film onto the first metal electrode. The first polymer film is not removed after transfer. A portion of the first polymer film is disposed between the first metal electrode and the second metal electrode. USE - The graphene electro-optic modulator is used in system for modulating optical signal traveling along optical waveguide according to electrical signal (all claimed). ADVANTAGE - The graphene electro-optic modulator does not perform modulation function in case of non-contact, is in physical contact with optical fiber (D-shaped fiber) in which side cladding layer is polished, allows interaction with light propagating inside optical fiber through the vane region, which extends outside the optical waveguide, modulates optical signal traveling through optical waveguide when it is in physical contact with that portion of the optical waveguide, can be applied to multiple optical circuits, and systems in limited number, can be freely contacted by user to the required portion, has non-blocking scheme which raises threshold at which optical elements interacting by light intensity are not damaged, provides foundation on which reconfiguration can be applied, controls modulation position and number of optical signal channels to be modulated, and performs multichannel modulation or broadcasting modulation, and has flicker ratio of up to 20 dB of light and operating speed performance in MHz. The system can be controlled by varying the distance between the electro-optic modulator and the optical waveguide since intensity of extended cladding region decreases exponentially with increasing distance from core of optical waveguide. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) graphene electro-optic modulator comprising an oxide film formed on the substrate, first and second metal electrodes spaced apart from each other on the oxide film, first graphene film electrically connected to the first metal electrode and first polymer film coated on the first graphene film, where a part of the first polymer film is disposed between the first metal electrode and the second metal electrode; and (2) system comprising graphene electro-optic modulator, an oscillator for oscillating an optical signal, a generator for generating the electrical signal, an amplifier for amplifying the electrical signal, a bias tee applying a bias voltage to electro-optic modulator based on the electrical signal, and an optical waveguide having a core and a cladding layer. The clad layer is at least partially polished and the graphene electro-optic modulator is in contact with the polished portion.