| 摘要 |
<p>In splicing two optical fibres (1, 1') in the common way the end surfaces of the fibres (1, 1') are placed opposite each other and then the fibre ends are melt-fusioned by means of an electric arc generated between two electrodes (5). In order to obtain a predetermined lateral displacement of the outer surfaces of the fibres, before the fusion melting the fibre ends are placed in positions with a displacement exceeding the desired one. In the fusion welding an electric current of a large intensity is passed between the electrodes (5) and then the first set lateral displacement will decrease due to surface tension. After the fusion melting the electric arc is continued but at a reduced intensity which also produces a lower temperature in the region at the splice of the fibre ends. At this stage the outer surfaces of the fibre ends are observed, which then, due to the surface tension, will continue to be more and more aligned with each other, that is the lateral displacement decreases. The electric arc is discontinued at a suitable time such that the desired lateral displacement is obtained after cooling.</p> |
