The invention relates to a device for guiding an optical fiber (2), which is intended to be mounted on a vertical tower (T) for manufacturing an optical fiber (2), the fiber being produced from an oven (18) located at the upper portion of the tower (T) and being moved vertically downward relative to the tower (T), the guide device (1) being located downstream of the oven (18), the device including: a first guide pulley (10), at least one surface (1220) for twisting the fiber (2), which is located downstream of the first guide pulley (10), a second guide pulley (14) located downstream of the at least one surface (1220) for twisting the fiber (2), and a deflecting pulley (16), the distance (C) between the first guide pulley (10) and the at least one surface for twisting the fiber (1220) being greater than the distance (D) between the at least one surface for twisting the fiber (1220) and the second pulley (14), the device being characterized in that it timber includes a second surface (1222) for twisting the optical fiber (2), wherein the two surfaces (1220, 1222) for twisting the optical fiber (2) are the two sides of a groove formed in a single twisting pulley (122).