| 摘要 |
PURPOSE:To make input/output side lens systems and a triangular prism unnecessary, to make a titled switch small-sized, to realize its mass production, and also to elevate its accuracy, by utilizing direct coupling of an input side optical fiber and an output side optical fiber. CONSTITUTION:An input side optical fiber 1 and an output side optical fiber are disposed to cross at an angle theta. A refractive index n2 of a core part of the optical fiber 2 is larger than a refractive index n1 of a core part of the input side optical fiber 1, and there is no clad or it is thin, therefore, the electric field distribution exudes to the outside of the fiber. The cross angle theta is smaller than cos<-1> (n1/n2), and when propagation constants beta1, beta2 of input 1' and switch light 2' satisfy theta=cos<-1> (beta1/beta2) by changing a distance of the optical fibers 1, 2, both fibers are coupled. Subsequently, the fiber 1 is fixed, the optical fibers are crossed through a spacer 6, and the distance between the fibers is changed by applying voltage to a laminated piezoelectric body 7. |
