Nanostructure Fusion Region of Single Mode Fiber Coupler

Abstract

This paper reported the characteristic of the fusion region of single mode fiber coupler. Theoretical consideration of the coupling model such as the degree of fusion and the profile of the coupling region has been investigated. The degree of fusion was inversely proportional with the separation distance between the fiber axis and the diameter of the fusion region. Fusion and elongation process also has also changed the geometrical structure of the single mode fiber. FESEM image describes that the Silicon distribution was defined as a spherical crystalline which were well-dispersed. The surface of coupling region fiber coupler has the average size of the spherical-shape crystalline varies between 300 – 500 nm. However, by increasing the elongation speed and the temperature will reduce the numbers of Si per unit area, so that the density becomes fewer. It also causes the distance between the spherical shapes become longer.