Method of coiling an optical fiber gyroscope and an optical fiber coil thus obtained

DETAILED DESCRIPTION The invention provides then a process for coiling a gyroscope of the Sagnac interferometer type comprising a ring formed of a multilayer optical fiber coil, comprising at least: a preliminary step of coiling an optical fiber length required for forming said coil over at least one intermediate coil; a first step of coiling a first layer of turns, on a cylindrical support comprising a central channel of circular section, so as to form a helical winding with constant pitch by unwinding the optical fiber from the intermediate coil; a second step consisting in introducing said intermediate coil inside the central channel, forming a single spiral turn on the inner wall of the central channel, wound in the same direction as the turns of the second layer, and removing the intermediate coil from the central channel through the end opposite the introduction end; and a third step of coiling an additional layer of turns by winding the optical fiber in the same direction as the turns of the underlying layer and using the interturn spaces of this layer as channel for guiding and positioning the optical fiber.
The invention also relates to the optical fiber coil obtained by the coiling method.