Calculation of the expected output spectrum for a mid-infrared supercontinuum source based on As₂S₃ chalcogenide photonic crystal fibers
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Date
2014-09-08
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R. J. Weiblen, A. Docherty, C. R. Menyuk, L. B. Shaw, J. S. Sanghera, and I. D. Aggarwal, "Calculation of the expected output spectrum for a mid-infrared supercontinuum source based on As₂S₃ chalcogenide photonic crystal fibers," Opt. Express 22, 22220-22231 (2014)
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“© 2014 Optical Society of America. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved
“© 2014 Optical Society of America. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved
Abstract
We computationally investigate supercontinuum generation in an As₂S₃ solid core photonic crystal fiber (PCF) with a hexagonal cladding of air holes. With a goal of obtaining a supercontinuum output spectrum that can predict what might be seen in an experiment, we investigate the spectral and statistical behavior of a mid-infrared supercontinuum source using a large ensemble average of 10⁶ realizations, in which the input pulse duration and energy vary. The output spectrum is sensitive to small changes (0.1%) in these pulse parameters. We show that the spectrum can be divided into three regions with distinct characteristics: a short-wavelength region with high correlation, a middle-wavelength region with minimal correlation, and a long-wavelength region where the behavior is dominated by a few rare large-bandwidth events. We show that statistically significant fluctuations exist in the experimentally expected output spectrum and that we can reproduce an excellent match to that spectrum with a converged shape and bandwidth using 5000 realizations.