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Honeycomb photonic bandgap fibers with and without interstitial air holes

Yanfeng Li, Ching-yue Wang, Minglie Hu, Bowen Liu, Xiwen Sun, and Lu Chai

Open Access Open Access

Abstract

The photonic bandgaps (PBGs) of honeycomb photonic bandgap fibers (HPBFs) with and without interstitial air holes (IAHs) are numerically investigated. It is shown that the IAHs can increase the width of PBGs in HPBFs, and also that at the same moderate total air filling fraction, HPBFs with IAHs produce more uniform PBGs than those without IAHs. The bandgap behavior is qualitatively explained using the node-and-vein concept.

©2005 Optical Society of America

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Figures (9)
Fig. 1.
Fig. 1. Schematic of an HPBF unit cell. Red circles represent the air holes of the HPBF with IAHs shown as blue circles. The diameters of the air holes and IAHs are D and Dint, respectively. The two yellow regions denote nodes, and a vein is shown in magenta.

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Fig. 2.
Fig. 2. Bandgap diagram for an HPBF of AFF f = 30% . The first four bandgaps are shown as the blue regions. The red line is the air line, and the grey area is the region where no light propagation is allowed.

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Fig. 3.
Fig. 3. Comparison of the relative bandgap sizes between the HPBFs with and without IAHs. The AFF of the HPBF without IAHs is 30%, and the AFF of IAHs is 5%.

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Fig. 4.
Fig. 4. The relative sizes of the primary and secondary gaps for an HBGF of f = 30% as a function of the AFF of the IAHs.

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Fig. 5.
Fig. 5. The relative sizes of the primary and secondary gaps for an HBGF of f = 50% as a function of the AFF of the IAHs.

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Fig. 6.
Fig. 6. The relative size of the primary gap for HPBFs with and without IAHs for fixed total AFFs. The dotted lines show the case of HPBFs without IAHs, while the sold lines represent the case of HPBFs with IAHs.

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Fig. 7.
Fig. 7. The relative size of the secondary gap for HBGFs with and without IAHs for fixed total AFFs. The dotted lines show the case of HPBFs without IAHs, while the sold lines represent the case of HPBFs with IAHs.

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Fig. 8.
Fig. 8. The relative size of the primary gap for HBGFs with and without IAHs for fixed total AFFs. The dotted lines show the case of HPBFs without IAHs, while the sold lines represent the case of HPBFs with IAHs.

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Fig. 9.
Fig. 9. The relative size of the secondary gap for HBGFs with and without IAHs for fixed total AFFs. The dotted lines show the case of HPBFs without IAHs, while the sold lines represent the case of HPBFs with IAHs.

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