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，由氢气纤维产生的光纤维光栅（FBG）的光谱是在暴露于紫外线激光器的情况下进化的，即热衰减的目的（1）。退火处理，FBG的波长和反射率根本不变，并且在三个主要结果（1）的情况下，我们已经酸痛了。 ATS的氢分子的含量主要是通过氢纤维的氢化液在长期纤维中的二氧化硅扩散来定义的。 NM和传播最小值，使用氢扩散理论。 Intoms与纤维芯中的掺杂GE反应，而GE-OH键则通过简单的重组返回分子，将氢耗尽在纤维核心中，周围的氢化是氢的已经证明了频谱的演变可以通过我们的努力中的最好的淬火来解释。重新填写长期FBG。我们已经为Lightwave Technology刊登了Firest的结果，我们已经完成了第二个结果以应用于第三个结果