| 摘要 |
PURPOSE:To stably obtain the optical fiber of a low connection loss by providing a preheating stage of heating the ends of the optical fibers prior to connection, a pressurizing stage, a resting stage and a stage of pulling back the fibers in the optical axis direction, thereby constituting the title method. CONSTITUTION:Two pieces of the optical fibers 1, 2 are held by butting the ends thereof against each other to a straight shape along the optical axis thereof. Electrodes 3, 4 are disposed on both sides of the end face parts in nearly an orthogonal direction. The end faces of the optical fibers 1, 2 are in the as-cut state in the preheating stage in this case and the end face parts of the two optical fibers 1, 2 are slightly melted by the first preheating. The end faces are uniformly shaped by the surface tension of the molten optical fibers 1, 2. The shaped optical fibers 1, 2 are pressurized and fused in the optical axis direction in the pressurizing stage. The fibers are rested in the heated state to uniformize the molten state of the glass in the resting stage. The pressurized optical fibers 1, 2 are pulled back in the optical axis direction and are so shaped as to eliminate the core deformation and to align the centers of the outside shape of the fibers in the pulling back stage. The connection with the low loss and high stability is executed in this way. |
