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Abstract
Surface modes (SM) are highly spatially localized modes existing at the core-cladding interface of photonic-bandgap hollow-core fiber (PBG-HCF). When coupling with SM, the air modes (AM) in the core would suffer a higher confinement loss despite being spectrally within the cladding photonic bandgap, and would be highly dispersive around the avoided crossing (anti-crossing) wavelength. In this paper, we numerically explored how such avoided crossings can play an important role in the tuning of the temperature dependence of group delay of AM of PBG-HCF. At higher temperatures, both the thermo-optic effect and thermal expansion contribute to the redshift of avoided crossing wavelength, giving rise to a temperature dependence of the AM dispersion. Numerical simulations show that the redshift of avoided crossing can significantly tune the thermal coefficient of delay (TCD) of PBG-HCF from −400 ps/km/K to 400 ps/km/K, approximately −120 ppm/K to 120 ppm/K. In comparison with the known tuning mechanism by thermal-induced redshift of photonic bandgap [Fokoua et al., Optica 4, 659, 2017], the tuning of TCD by SM coupling presents a much broader tuning range and higher efficiency. Our finding may provide a new route to design PBG-HCF for propagation time sensitive applications.
Original language | English |
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Pages (from-to) | 222-231 |
Number of pages | 10 |
Journal | Optics Express |
Volume | 30 |
Issue number | 1 |
DOIs | |
Publication status | Published - 3 Jan 2022 |
Bibliographical note
Funding Information:Funding. Natural Science Foundation of Hebei Province (F2021203002); National Key Research and Development Program of China (2020YFB1312802); Chinese Academy of Sciences (Pioneer Hundred Talents Program, ZDBS-LY-JSC020); National Natural Science Foundation of China (61935002); International Science and Technology Cooperation Programme (2018YFE0115600).
Publisher Copyright:
© 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
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- 1 Finished
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Hollow Antiresonant Fibres for Visible and Ultraviolet Beam Delivery
Knight, J. (PI), Birks, T. (CoI) & Wadsworth, W. (CoI)
Engineering and Physical Sciences Research Council
1/11/15 → 31/10/18
Project: Research council