Origin of periodic void formation during fiber fuse

Optics Express (Impact Factor: 3.49). 09/2005; 13(17):6381-9. DOI: 10.1364/OPEX.13.006381
Source: PubMed


An optical discharge running through a single-mode silica glass fiber during fiber fuse was observed and the front part of the generated damage was examined. Their pump power dependences were investigated using a 1.48 mum laser light at powers ranging from 1.1 to 9.0 W. Periodic voids were left by an optical discharge that was in a cavity with a tail. The tail appears because the optical discharge is strongly enclosed in core region. Another mode of periodic void formation was found at near the threshold pump power for fiber fuse propagation. The optical discharge in this case also forms a transient tail during the void formation cycle.

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    • "Optical signals cannot be transmitted through fiber damaged in this way. There have been several studies regarding the generation mechanisms [1] [2] [3] [4] [5], the bubble formation mechanism and the emission properties from the plasma discharge that occurs when bubbles are formed [6] [7] [8] [9]. Recently, passive prevention methods employing a tapered core structure [10] [11] and a hole assisted fiber structure [12] [13] [14] [15], and active prevention methods in which the high power light source is turned off by monitoring the RF signal of the reflected light from the bubble train [16], have also been proposed to prevent a transmission fiber from suffering damage over a long distance. "
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    ABSTRACT: We investigate in detail the scattering properties and heating characteristics in various commercially available optical fibers and fiber cables when a bubble train forms in the middle of the fiber as a result of the fiber fuse phenomenon that occurs when a high power signal is launched into the fiber. We found theoretically and experimentally that almost all the optical light is scattered at the top of the bubble train. The scattered light heats UV coated fiber, nylon jacketed silica fiber, fire-retardant jacketed fiber (PVC or FRPE jacketed fiber) and fire-retardant fiber cable (PVC or FRPE fiber cable), to around 100, over 200 and over 600°C, respectively, and finally the fiber burns and is destroyed at a launched optical power of 3W. Furthermore, it is confirmed that the combustion does not spread when we use fire retardant jacketed fibers.
    Preview · Article · Aug 2012 · IEICE Transactions on Communications
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    • "Surprisingly enough, the following morning, I received a detailed question via e- Make the best use of your serendipity by inspiring your audience / S. Todoroki mail from an overseas researcher. Although similar videos of mine had already been published in an open access journal [8] [10] the previous year, they had not been seen by the questioner. On the other hand, I uploaded the manuscript file of Episode 1 to my homepage and it caught an editor's eye. "
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    Preview · Article · Jan 2009
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    • "The fiber fuse effect was first reported in the late 1980's [1], [2]. It is initiated by the local heating of an optical fiber, which delivers a few watts of light, and generates an optical discharge running along the fiber to the light source at a speed of about 1 m/s (see the movie in the online version of [3] (Fig. 1) that shows a macroscopic view of fiber fuse propagation). This results in the catastrophic destruction of the core region. "
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    ABSTRACT: Fiber fuse is a process of optical fiber destruction under the action of laser radiation, found 20 years ago. Once initiated, opical discharge runs along the fiber core region to the light source and leaves periodic voids whose shape looks like a bullet pointing the direction of laser beam. The relation between damage pattern and propagation mode of optical discharge is still unclear even after the first in situ observation three years ago. Fiber fuse propagation over hetero-core splice point (Corning SMF-28e and HI 1060) was observed in situ. Sequential photographs obtained at intervals of 2.78 micros recorded a periodic emission at the tail of an optical discharge pumped by 1070 nm and 9 W light. The signal stopped when the discharge ran over the splice point. The corresponding damage pattern left in the fiber core region included a segment free of periodicity. The spatial modulation pattern of the light emission agreed with the void train formed over the hetero-core splice point. Some segments included a bullet-shaped void pointing in the opposite direction to the laser beam propagation although the sequential photographs did not reveal any directional change in the optical discharge propagation.
    Preview · Article · Feb 2008 · PLoS ONE
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