The invention discloses a
fiber-optic loop structure wound in a vertically symmetrical cross manner for a
fiber-optic
gyroscope. The
fiber-optic loop structure comprises a fiber-optic loop skeleton which comprises a wrapping post and a middle
flange, wherein the middle
flange is arranged at the periphery of the wrapping post, the middle
flange is provided with a fiber passing notch, horizontally run-though bellmouth orifices are arranged on the wrapping post and the middle flange and are located at the symmetrical positions of the fiber passing notch, and a fiber outlet is formed on the middle flange. A vertically symmetrical crosswise winding method for the fiber-optic
gyroscope comprises the following steps: 1, setting the midpoint of an
optical fiber at the position of the fiber passing notch of a fiber-optic loop; 2, winding the
optical fiber; and 3, leading the
optical fiber into the fiber outlet. According to the invention, a fiber-optic coil is divided into an upper part and a lower part, and each of the two parts has one side which is free of structural restriction and is not compressed in conditions of vibration and temperature variation; and through cross winding, the coils at two sides both have forward and reverse optical fibers which are the same in length, so that temperature gradients in axial and radial directions have the same
temperature modulation effect on the optical fibers.