▎ 摘　　要

NOVELTY - The full-fiber structure has an optical fiber (1) that is connected with a terminal. A periphery of a fiber core is set with a module converter and a Bragg periphery (4). A light fiber cladding is covered with a graphene thin film (3). USE - Full-fiber structure of electric field sensing element s for electric field sense device (claimed). ADVANTAGE - The insertion loss in the full-fiber structure is reduced effectively in reliable manner. The electric field sensing element is convenient. The electric field sensing element is provided with high sensitivity in precise manner. The cost of the electric field sensing element is reduced. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for an electric field sense device. DESCRIPTION OF DRAWING(S) - The drawing shows a. Optical fiber (1) Mode converter (2) Graphene thin film (3) Bragg periphery (4)