| Summary: | 碩士 === 國立臺灣大學 === 機械工程學研究所 === 105 === Fiber-optic communication is flourishing in recent year, applying to most massive rapid communication systems. At the same time, requirements of splicing different optical fibers together greatly increase, since more and more optical fibers with different properties are created and studied. This study starts from the core-retracting phenomenon which happens at splicing two different optical fibers on traditional fusion splicers, aiming to solve the problem by heating only the cladding with multiple arc discharges which bypass the core, in order to reduce the splice loss caused by core-retracting. The study focuses on the influences between two arcs, which are generated in axial and radial directions of the optic fiber. Radial tip gaps and the relative direction of currents are changed while axial tip gaps are fixed. Voltage and current in the electrodes are analyzed in order to figure out the influences of the placing relationships. The heating abilities of different parts of the arcs are tested by single-mode fibers.
In the study, the arc system is composed of two arc-producing devices with 180-degree phase difference between each other. In the experiment of parallel arcs, breakdown voltage and phase angle become lower when radial tip gap decreases, the arcs bend and get closer to each other at the same time. As the radial tip gap gets close enough, plasma area appears between the arcs, which also lowers the breakdown voltage, while phase difference between arcs decrease when in the same direction as the currents and increases when reversed. In the experiment of crossed arcs, breakdown voltage increases when radial tip gap increases. In some conditions, an additional parallel arc appears, which builds a closed plasma area surrounded by arc, accompanied with negative phase angle. The power of the additional parallel arcs is also calculated and discussed. According to the experiments, we find that the power of arc increases for some reason. The power of arc is most affected by the arc voltage, and the increase of arc voltage is related to the plasma area between arcs.
|
|---|
