| 摘要 |
PURPOSE:To obtain an optical branching device which has good mass productivity and small loss of light and variation thereof and can vary a branching ratio by constituting the branching device of an optical fiber assemblage, forming each exit end face into a circular shape, integrating incident end faces to one body for each of the optical fiber assemblages that make branch passages for each light and assembling the same to an elliptial shape as a whole. CONSTITUTION:An optical branching device 10 in an optical fiber assemblage wherein plural pieces of optical fibers 11 of fine glass are bundled, that is, one end of the bundled optical fibers is used as an incident end face 12 for light and the other end is branched to two as branch passages 14 and 15. The outside shape of the bundled optical fibers for exit end faces 16 and 17 of light is made into the circular shape of the same diameter as the diameter of optical fibers 1, 2 and 3 for transmission and reception. The bundled optical fibers for the face 12 are bundled to the elliptical shape having the width equal to the diameter of the circular shape of the exit end face for light and the semicircular shape equal to the top and bottom ends of said end face. The bundled optical fibers constituting the paths 14 and 15 are distinctly separated at the boundary of a line 18. |
