Experimental Study of Thermal Decay of Fiber Bragg Grating and its Theoretical Modeling of Arrhenius Analysis

光纤布拉格光栅热衰变实验研究及其阿累尼乌斯分析理论模型

基本信息

批准号：
15560298
负责人：
EJIMA Seiki
金额：
$ 1.41万
依托单位：
Kagawa University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560298/
关键词：
Fiber grating Optical fiber Fiber Bragg grating Annealing Hydrogen loading UV laser Induced refractive index ファイバーブラックグレーティング

项目摘要

Optical spectrum of fiber Bragg grating (FBG) produced from hydrogen-loaded optical fiber is well known to evolve over a wide range after its fabrication by exposing to UV laser, that is, thermal decay. The purposes of this research are (1) to stabilize the optical spectrum by annealing thermal treatment so that the wavelength and reflectivity of the FBG do not vary at all, and (2) to understand the physics reason of the thermal decay. We have achieved following three major results.(1)We have proved that the evolution of short-period FBG wavelength after its fabrication is dominantly defined by out-diffusion of hydrogen molecules from the optical fiber. Quantitative agreement has been obtained with theoretical calculation of hydrogen diffusion in silica glass of the optical fiber.(2)In long-period FBG, the wavelength goes through a large upswing ranging over several tens to 100 nm and transmission minimum becomes deeper after its fabrication. Using theory of hydrogen diffusion and comp … More uter FBG simulation, we have revealed that the spectrum evolution is caused by quenching and re-filling of the hydrogen in the fiber core. The hydrogen in the core is dissociated by UV irradiation into atoms, and some H-atoms react with doped Ge in the fiber core forming Ge-OH bond and others return back to molecules by simple recombination, that is, the hydrogen is depleted in the fiber core, i.e. quenching. Then the surrounding cladding of the fiber supplies hydrogen to the core, i.e. re-filling. We have demonstrated that the spectrum evolution can be all explained by the quenching and re-filling.(3)Erdogan's theory has been extensively used for the analysis of thermal decay process of the short-period FBGs. To the best of our knowledge, no attempt has ever been made to apply the theory to long-period FBGs. Using the above result about the spectrum evolution by hydrogen quenching and re-filling, we have succeeded in applying the Erdgan's theory to long-period FBGs.We have published the first result to Journal of Lightwave Technology, and we have completed submitting our second result to Applied Optics. For the third result, we plan to publish soon. Less

众所周知，由氢装载的光纤产生的纤维bragg光栅（FBG）的光谱是通过暴露于紫外线激光（即热衰减）后在其制造后在较大范围内进化的。这项研究的目的是（1）通过退火处理热处理稳定光谱，以使FBG的波长和反射率完全没有变化，并且（2）了解热衰减的物理学原因。我们已经取得了三个主要的结果。（1）我们规定，在制造后短期FBG波长的演变主要通过光纤中的氢分子过度降低来显着定义。已经通过理论计算氢扩散在光纤的硅胶玻璃中获得了定量一致。（2）在长期fbg中，波长经历了一个很大的增长，在几十至100 nm的范围内，使用氢扩散的理论在几十至100 nm上进行了范围，并通过氢化的理论进行了最小值……更多的UTER FBG模拟，我们的杂音又是综合的。纤维芯。芯中的氢通过紫外线照射到原子中解离，并且一些H原子与形成Ge-OH键的纤维核中掺杂的GE反应，而其他H原子通过简单的重组返回到分子，也就是说，氢在纤维核中耗尽，即淬灭。然后，纤维的周围覆层将氢提供给核心，即重新填充。我们已经证明，频谱进化可以通过淬火和重新填充。（3）Erdogan的理论已被广泛用于分析短期FBG的热衰减过程。据我们所知，从未尝试过将理论应用于长期的FBG。使用上述结果，通过氢淬火和重新填充频谱的演变，我们成功地将Erdgan的理论应用于长期FBG。我们已经发布了Lightwave技术杂志的第一个结果，并且我们已经完成了第二个结果以应用光学。对于第三个结果，我们计划很快发布。较少的