【作者】 马任德；

【导师】 王政平；

【作者基本信息】 哈尔滨工程大学 ， 光学， 2006， 硕士

【摘要】 长周期光纤光栅是一种新型的光学器件。它具有传统光学器件不具备的很多优点，因此长周期光纤光栅的制作受到广泛的关注。目前已经有多种制作长周期光纤光栅的方法，但它们都有自己的局限性，在现实应用中都受到一定的限制，光纤光栅的制作需要进一步探讨。本文总结了目前长周期光纤光栅的制作方法，分析了它们制作原理的优缺点，提出了用电子辐照制作长周期光纤光栅的方法；对长周期光纤光栅进行了理论分析，仿真模拟了光纤光栅透射谱，计算了描述纤芯基模与包层模耦合所需的众多参数；综述了电子辐照二氧化硅制作光波导的研究进展，从而证明了电子辐照法制作长周期光纤光栅的可行性；计算可得，0.4474MeV能量的电子将在普通通信用单模石英光纤芯中产生最大的折射率改变量，综合各种因素考虑，这个能量的电子将是制作长周期光纤光栅的最佳能量；在分析占空比对光栅光谱的影响后，制作了光栅掩模板并通过试验用电子辐照法试制了长周期光纤光栅，对试验结果进行分析，给出了今后研究中需要改进之处。作为一种新颖的制作方法，它的成功必将进一步促进长周期光纤光栅制作技术的发展。更多还原

【Abstract】 As a new kind of optical device, long period fiber gratings have many virtues that other devices do not have. So the fabrication of it attracts many people. There are already many methods to fabricate long period fiber gratings, but they all have there own disadvantages which limit their applicaton. The method to fabricate long period fiber gratings needs to be enriched.By summarizing the methods to fabricate long period gratings that have already exist, and analyzing the advantange and disadvantages of their principle, it is proposed that long period fiber gratings can be fabricated by use of electron beam irradiation. Then, the theory of long period fiber gratings is analyzed, and the transmission spectrum is simulated, parameters that describing the coupling of fundmental core mode and cladding modes are also calculated. In order to prove the possibility of fabricating long period fiber gratings by use of electron irradiation, the progress of fabricating optical waveguides on SiO₂ with the same method is summarized. It is calculated that electrons with energy of 0.4474MeV will generate the largest refractive index modulation in the single mode fiber core. By synthesizing all kinds of factors, this will be the best energy to fabricate long period fiber gratings. Then the mask were fabricated after analyzing the influence of duty cycle to the grating spectrum, and the fabrication of long period fiber gratings was tested at the same time. Several aspects that need to be improved were presented after analyzing the results of the experiment. As a new way, its success will promote the development of fabricating fiber gratings further more.更多还原