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Effect of interstitial air holes on Bragg gratings in photonic crystal fibre with a Ge-doped core 下载免费PDF全文
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
λB shift a little towards short wavelengths and
increase λB-λ1 (the wavelength spacing
between the main peak with Bragg resonance wavelength λB and the first side peak with wavelength λ1 and the
coupling coefficient к 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. 相似文献
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