▎ 摘　　要

NOVELTY - The optical fiber has a graphene oxide (GO) layer and a restored graphene oxide (rGO) layer that are welded into a task cross-sectional view of a core layer. A cladding layer is surrounded around the core layer. The optical fiber is made of glass, plastic or polymer. USE - Optical fiber e.g. single mode optical fiber and multimode optical fiber of gas sensor (claimed). Can also be used in temperature sensor, pressure sensor, gyroscope, speed meter and wind vane. ADVANTAGE - The optical fiber can be manufactured easily. The selectivity of the optical fiber can be improved. The high humidity and the strong acidity of the optical fiber can be ensured. The commercialization of the gas sensor can be promoted. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) a manufacturing method of optical fiber; and (2) a manufacturing method of gas sensor. DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of the optical fiber. (Drawing includes non-English language text)