| 摘要 |
PURPOSE:To obtain an alternating bypass type optical circuit having a long interval between optical repeaters by using an optical branching filter in which an optical fiber formed of a plastic having the end faces formed when the top ends are joined within the same plane and constituting a true circle is used as the optical line. CONSTITUTION:The top end at one end of an optical fiber formed of a plastic is cut along the longitudinal direction thereof and is worked to a wedge-like shape. The end face of the top end is also worked to an arc shape. A true circle is formed of the two arcs when two pieces of such optical fibers are superposed. The optical fiber is then inserted and fixed into the plut hole of an optical connector while the cut faces of both ends coated with a cladding material are held in tight contact with each other to form an optical branching part. An optical fiber 17 extended from an optical connector 131 is used as an optical line connecting respective optical repeaters 11. A fiber 17' for light serves as an optical line to be connected to the light receiver 14 in each repeater 11 and if optical connectors 132, 133 are attached to the top end thereof, the fiber can be used as an optical line 13 in common use as an optical branching filter and an optical connector. The plural repeaters 11 are successively connected by using the fibers 16 provided with the optical connectors at both ends and the lines 13, by which the alternating bypass type optical circuit is constituted. |
