Measurement of group-velocity dispersion of Bloch modes in photonic-crystal-fiber rocking filters.
We use low-coherence interferometry to measure the group-velocity dispersion (GVD) of the fast and slow Bloch modes of structural rocking filters, produced by twisting a highly birefringent photonic crystal fiber to and fro while scanning a focused CO(2) laser beam along it. The GVD curves in the vicinity of the resonant wavelength differ dramatically from those of the unperturbed fiber, suggesting that rocking filters could be used in the optimization of, e.g., four-wave mixing and supercontinuum generation. Excellent agreement is obtained between theory and experiment.
Max Planck Institute for the Science of Light, Guenther-Scharowsky-Strasse 1/Bau 24, 91058 Erlangen, Germany. gordon.wong@mpl.mpg.de
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GK
Wong
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L
Zang
M S
MS
Kang
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PS
Russell