摘要
本文对光子晶体光纤重叠光栅的传输光谱及特性进行了研究.在理论上,提出了基于V-I传输矩阵法的光子晶体光纤重叠光栅分析模型,仿真研究了布拉格叠栅和啁啾叠栅的反射谱和时延特性.在实验上,利用193 nm紫外激光在光敏单模光子晶体光纤中实验制备了定制波长间隔的四重布拉格重叠光栅和波长间隔0.82 nm的啁啾重叠光栅.研究结果显示布拉格光栅的重叠光栅可通过各子光栅写制参数实现光谱灵活定制;基于啁啾光栅的重叠光栅具有周期性宽带滤波特性,谐振周期可由光栅周期偏移调整,且具有平坦的幅度响应和呈良好线性的群时延.实验所得光栅光谱与理论分析很好地符合.研究结果为光子晶体光纤重叠光栅的设计、制备及应用提供了重要的参考依据.
The superimposed gratings have attracted considerable interest because they can extend the potential applications of gratings. Superimposed gratings are fabricated by inscribing multiple gratings at the same section of the fiber, and they can demonstrate various features simultaneously. A number of optical devices based on superimposed gratings have been reported, such as multi-wavelength filters, beam shapers, ultrahigh repetition rate optical pulse generators, etc. Photonic crystal fiber（PCF） can bring new optical characteristics by changing the sizes, spacings and arrangements of the air holes in the fiber. In this paper, we present the spectra of the superimposed gratings inscribed in a photonic crystal fiber.A numerical mode is proposed based on the V-I transmission matrices. The traditional cosinoidal variation of refractive index is replaced with a square-type refractive index variation, and the scattering occurs at a localized discrete location.According to the simulations, the reflection spectra and time delays of a superimposed Bragg grating and superimposed chirped Bragg grating are analyzed. A superimposed Bragg grating and a superimposed chirped Bragg grating are fabricated in the single mode photosensitive PCFs under the irradiation of a 193 nm ultraviolet laser. The superimposed Bragg grating is composed of four subgratings with resonance wavelengths at set spacings. And under a phase mask displacement of 1.03 mm, the superimposed chirped Bragg grating has a periodic resonance with a period of 0.82 nm.The results show that the spectrum of superimposed Bragg grating can be flexibly customized by the parameters of each subgrating. Superimposed chirped Bragg gratings have good linear group delays and flat periodic resonance amplitudes,and the resonance period can be adjusted by displacing the phase mask. The grating spectra obtained from experiments are in good agreement with the theoretical analyses. The research results in this paper provide an important basis for designing, fabricating, and app
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2016年第20期123-128,共6页
Acta Physica Sinica
基金
国家自然科学基金(批准号:61475133
61275093
61575170)
河北省自然科学基金(批准号:F2015203277
F2016203389
F2016203392)
河北省应用基础研究计划重点基础研究项目(批准号:16961701D)资助的课题~~
关键词
光子晶体光纤
光子晶体光纤叠栅
V-I传输矩阵
光谱特性
photonic crystal fiber
superimposed photonic crystal fiber grating
V-I transfer matrix
spectrum characteristics
