Abstract
The subwavelength structure of the core of a photonic crystal fibre can modify its dispersion characteristic and significantly shift the zero dispersion wavelength. The dispersion properties of photonic crystal fibres with core structures made of a 2D lattice of subwavelength air holes and various glass inclusions are studied. We show that a modification of the core structure can give flat dispersion over a range of over 300 nm and can shift the zero dispersion wavelength over 700 nm while the core diameter and photonic cladding remain unchanged. The developed photonic crystal fibre with nanorod core has successfully demonstrated supercontinuum generation in NIR.
Highlights
Photonic crystal fibres (PCFs) are a very efficient medium for supercontinuum generation [1]
For silica-based photonic crystal fibre the zero dispersion wavelength (ZDW) can be shifted into the visible region and a range of pulsed sources can be efficiently used for broadband supercontinuum generation covering the entirety of the visible and near infrared spectrum
Kibler et al shown that introduction of subwavelength single air holes in core modify significatly dispersion properties of the PCF and it can be used for spectral tunelling of solitons [7]
Summary
Photonic crystal fibres (PCFs) are a very efficient medium for supercontinuum generation [1]. For silica-based photonic crystal fibre the zero dispersion wavelength (ZDW) can be shifted into the visible region and a range of pulsed sources can be efficiently used for broadband supercontinuum generation covering the entirety of the visible and near infrared spectrum. Kibler et al shown that introduction of subwavelength single air holes in core modify significatly dispersion properties of the PCF and it can be used for spectral tunelling of solitons [7] Successful development of this type of fibers are reported by Wiederhecker at al [8], Ruan at al. In this paper we propose to structure a core of the PCF with high index inclusions to tailor its dispersion properties and blue shift of zero dispersion wavelength In this case the core of a standard PCF with air-hole cladding is structured with a single subwavelength rods
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