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The coefficients from the polynomial fit to the dispersion profile do not have enough digits to reproduce the curve. A scaling error on Figs. 3 and 4 has been corrected.
©2005 Optical Society of America
In the article[1] we showed the measured dispersion profile of a photonic crystal fiber with two zero dispersion wavelengths. Coefficients from a 9th order polynomial fit to this dispersion curve were listed in Table 1. Unfortunately the number of digits shown in the table is not sufficient to reproduce the curve-we have found that the coefficients must have 10 digits for the expansion to be accurate. Information about the dispersion profile can be obtained by contacting the authors.
The Figs. 3 and 4 show scaled higher order terms of the dispersion. The curves have been scaled to f s 2/mm while the units on the vertical axes are f s 2/cm. In the following figures the scaling has been corrected to match the units f s 2/cm.
Fig. 1. Left: The scaled dispersion terms β 2, β 4, β 6 and β 8 as functions of λ. The higher order dispersion terms are of considerable size and change sign several times in the shown interval. Right: A zoom on the high-frequency ZDW shows that β 4 and β 8 are negative below the ZDW. They can therefore compensate for the positive β 2 and β 6 which means that phasematching is possible in the normal dispersion regime.
References and links
1. T. V. Andersen, K. M. Hilligsøe, C. K. Nielsen, J. Thøgersen, K. P. Hansen, S. R. Keiding, and J. J. Larsen, “Continuous-wave wavelength conversion in a photonic crystal fiber with two zero-dispersion wavelengths,” Opt. Express 12, 4113–4122 (2004), http://www.opticsexpress.org/abstract.cfm?URI=OPEX-12-17-4113. [CrossRef] [PubMed]
