Impact of steepness of pump temporal pulse profile on spectral flatness and correlation of supercontinuum in all-solid photonic crystal fibers with flattened normal dispersion

Steepness effects of pump pulse temporal profile on supercontinuum spectrum in an all-solid, normally dispersive photonic crystal fiber are investigated numerically. Utilizing a multi-shot supercontinuum spectra generated with a statistical nonlinear Schrödinger equation model and computed spectral...

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Bibliographic Details
Published in:Journal of Optics 2014-08, Vol.16 (8), p.1-9
Main Authors: Klimczak, Mariusz, Komolibus, Katarzyna, Piwoński, Tomasz, Siwicki, Bartłomiej, Pysz, Dariusz, Stępień, Ryszard, Ochalski, Tomasz, Buczyński, Ryszard
Format: Article
Language:English
Subjects:
all-normal dispersion supercontinuum
all-solid glass photonic crystal fiber
Crystal fibers
Dispersions
Fibers
Mathematical models
Photonic crystals
pump pulse steepness effect
Pumps
Spectra
Spectral correlation
spectral correlation map
Temporal logic
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Summary:Steepness effects of pump pulse temporal profile on supercontinuum spectrum in an all-solid, normally dispersive photonic crystal fiber are investigated numerically. Utilizing a multi-shot supercontinuum spectra generated with a statistical nonlinear Schrödinger equation model and computed spectral correlation maps, we discuss both the timescale and the spectral bandwidth of parametric interaction between self-phase modulation and optical wave-breaking components in the formation of the spectrum. Gaussian and hyperbolic secant pump pulse profiles, modelled with analytical formulas, are used to show the role of the wings of temporal pulse profile in the flatness of the developing supercontinuum from the perspective of spectral correlation. Degree of coherence of the numerical spectra is also analyzed and it is shown how steepened pump pulse slope preserves pump laser shot noise in otherwise coherent, normal dispersion supercontinuum generation. All-normal dispersion supercontinuum spectrum was also recorded experimentally in a photonic crystal fiber in the 1350-1750 nm range of wavelengths (E-U telecommunication bands), under 1550 nm pumping with 180 fs pulses and moderate in-coupled energy of 1 nJ, reproducing the bandwidth and general features of one of the numerical cases.
ISSN:2040-8978
2040-8986
1464-4258
DOI:10.1088/2040-8978/16/8/085202