Effect of interstitial air holes on Bragg gratings in photonic crystal fibre with a Ge-doped core

被引：0
|
作者：
张慧嘉 [1 ]
李曙光 [1 ]
侯蓝田 [1 ]
机构：
[1] State Key Laboratory of Metastable Materials Science and Technology, College of Science, Yanshan University
来源：
Chinese Physics B | 2009年 / 02期
基金：
中国国家自然科学基金;
关键词：
photonic crystal fibre; fibre grating; beam propagation method; interstitial air holes;
D O I：
暂无
中图分类号：
TN253 [光纤元件];
学科分类号：
摘要：
The effect of interstitial air holes on Bragg gratings in photonic crystal fibre (PCF) with a Ge-doped core is numerically investigated by using the beam propagation method (BPM). It is shown that the interstitial air holes (IAHs) can make Bragg resonance wavelength λ B shift a little towards short wavelengths and increase λ B λ 1 (the wavelength spacing between the main peak with Bragg resonance wavelength λ B and the first side peak with wavelength λ 1 ) and the coupling coefficient κ of Bragg resonance. Moreover, when the ratio of air hole diameter (d) to pitch (Λ), d/Λ, is small, IAHs can suppress the cladding mode resonance. When d/Λ is large, IAHs increase the number of mode that could strongly interact with the fundamental mode. By comparing the transmission spectral characteristics of PCF-based fibre Bragg grating (FBG) with IAHs with those without IAHs at the same air-filling fraction, it is clarified that the change of transmission spectral characteristics of PCF-based FBG with IAHs is not due to a simple change in air-filling fraction. It is also closely related to the distribution of interstitial air holes.
引用
收藏
页码：630 / 635
页数：6
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