| 摘要 |
PURPOSE:To reduce a zero-point drift in a ring interferometer due to a change in ambient temperature by a method wherein the parts of an optical fiber located at positions symmetric with respect to the middle point thereof are disposed at positions being near spatially. CONSTITUTION:An optical fiber 1 to be coiled is divided in two sections (a) and (b). The boundary 2 of the sections (a) and (b) is set as a point of start of winding on a bobbin 3 and disposed in a one end part (of a first line) of a first layer, and the first (or a third) layer is formed in the section (a) and a second (or fourth) layer in the section (b) by winding in the same (or reverse) direction as indicated by winding directions of arrows 4. A fifth (or seventh) layer is formed in the section (b) and a sixth (or eighth) layer in the section (a) by winding. Thereafter the same winding is repeated every eight layers, and thereby a multilayer optical fiber coil is formed. Since according to this method, the parts of the optical fiber located at positions symmetric with respect to the middle point (the boundary 2) thereof are disposed at positions being near spatially, a zero-point drift in a ring interferometer due to a change in ambient temperature can be reduced. |
