Optical waveguides – With splice – Fusion splicing
Patent
1995-03-08
1997-06-10
Palmer, Phan T. H.
Optical waveguides
With splice
Fusion splicing
385 95, 385 97, 385 98, 21912111, 21912114, G02B 6255
Patent
active
056384769
ABSTRACT:
In splicing two optical fibers in the common way, the end surfaces of the fibers are placed opposite each other and then the fiber ends are melt-fusioned using an electric arc generated between two electrodes. In order to obtain a predetermined lateral displacement of the outer surfaces of the fibers, the fiber ends are placed in positions with a displacement exceeding the desired displacement before the fusion melting. During fusion welding, an electric current of a large intensity is passed between the electrodes, and the first-set lateral displacement will decrease due to surface tension. After the fusion melting, the electric arc is continued at a reduced intensity which also produces a lower temperature in the region at the splice of the fiber ends. At this stage, the outer surfaces of the fiber ends are observed, which then become more and more aligned with each other (that is, the lateral displacement decreases) due to the surface tension. The electric arc is discontinued at a suitable time such that the desired lateral displacement is obtained after cooling.
REFERENCES:
patent: 4557556 (1985-12-01), Decker, Jr.
patent: 5002351 (1991-03-01), Szanto et al.
patent: 5013345 (1991-05-01), Itoh et al.
patent: 5046813 (1991-09-01), Itoh et al.
patent: 5170456 (1992-12-01), Itoh et al.
I. Yokohama et al., "Fiber-Coupler Fabrication with Automatic Fusion-Elongation Processes for Low Excess Loss and High Coupling-Ratio Accuracy," IEEE Journal of Lightwave Technology, vol. LT-5, No. 7, pp. 910-915 (Jul. 1987).
Palmer Phan T. H.
Telefonaktiebolaget LM Ericsson
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