Experimental investigation of cut-off phenomena in non-linear photonic crystal fibers

Folkenberg, J. R.; Mortensen, N. A.; Hansen, K. P.; Hansen, T. P.; Simonsen, H. R.; Jakobsen, C.

Experimental investigation of cut-off phenomena in non-linear photonic crystal fibers

Authors

Description

The modal cut-off is investigated experimentally in a series of high quality non-linear photonic crystal fibers. We demonstrate a suitable measurement technique to determine the cut-off wavelength and verify it by inspecting the near field of the modes that may be excited below and above the cut-off. We observe a double peak structure in the cut-off spectra, which is attributed to a splitting of the higher order modes. The cut-off is measured for seven different fiber geometries with different pitches and relative hole size, and a very good agreement with recent theoretical work is found.
3 pages including 1 table and 4 figures. Accepted for Optics Letters