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首页> 外文会议>IWCS/Focus~TM Conference >Formation of Hydroxyl Due To Reaction of Hydrogen with Quartz during Optical Fiber Preform Making By Furnace Chemical Vapour Deposition (FCVD) Method
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Formation of Hydroxyl Due To Reaction of Hydrogen with Quartz during Optical Fiber Preform Making By Furnace Chemical Vapour Deposition (FCVD) Method

机译：通过炉化学气相沉积（FCVD）方法在光纤预成型件期间与石英氢气的反应形成羟基

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摘要

Hydroxyl (OH) groups are one of the main impurities contributing to optical transmission loss in fibers. In modified chemical vapor deposition (MCVD) process, which is widely used for quartz preform fabrication, one of the sources of OH is oxygen-hydrogen burner. During the deposition and especially "jacketing" processes with heating the tubes in a burner flame, molecular hydrogen deeply penetrates tube wall and reacts with the preexisting defects in quartz to form hydroxyl. In FCVD preform fabrication method an induction furnace is used instead of oxygen-hydrogen burner. Furnace hot zone is purged by argon gas flow in order to protect heating elements from oxidation in air. Using this method to produce optical fiber preforms makes it possible to avoid on of the main sources of hydrogen and significantly reduce its diffusion into quartz. In this work, the formation mechanism of hydroxyl due to reaction of hydrogen with quartz during preform making by FCVD method was investigated. The obtained results proved that OH concentration in preform made by furnace CVD process can be reduced to a lower level than in standard MCVD process. This improvement makes possible to fabricate optical fibers with significantly reduced water peak by internal deposition process.
机译：羟基（OH）基团是有助于光学透射率在纤维中的主要杂质之一。在改进的化学气相沉积（MCVD）过程中，广泛用于石英预制件制造，OH的源源之一是氧 - 氢燃烧器。在沉积期间，特别是“夹套”过程加热管在燃烧器火焰中加热管，分子氢深深穿透管壁，并与石英中的预先存在的缺陷反应形成羟基。在FCVD预制件制造方法中，使用感应炉代替氧气燃烧器。通过氩气流吹扫炉热区，以保护加热元件免受空气中的氧化。使用该方法生产光纤预成型件使得可以避免氢气的主要源，并显着将其扩散变为石英。在这项工作中，研究了通过FCVD方法在预制件制造过程中与石英氢反应引起的羟基的形成机制。所得结果证明，OH浓度在炉CVD工艺制备的预制件中可以减少到比标准MCVD工艺中的较低水平。这种改进使得可以通过内部沉积过程制造具有显着降低的水峰的光纤。

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