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Q: Quantenoptik und Photonik
Q 59: Photonische Kristalle IV
Q 59.6: Talk
Thursday, March 16, 2006, 12:25–12:40, HI
Supercontinuum generation in planar rib waveguides — •Anton Husakou1, Olga Fedotova2, and Joachim Herrmann1 — 1Max Born Institute, Max Born Str. 2a, 12489 Berlin, Germany — 2Institute of Solid State and Semiconductor Physics, Brovki str. 17, 220072 Minsk, Belarus
Many applications in research and engineering require sources of coherent broadband radiation, so-called supercontinuum (SC). Here we study the perspectives for generating supercontinuum spectra in planar rib waveguide structures, which can enable simple SC source in the framework of integrated optics. We calculate the dispersion of the rib waveguide by the effective refractive index method. The propagation of the pulse in the rib waveguide is described numerically using first-order forward Maxwell equation without slowly-varying-envelope approximation and accounting for dispersion to all orders. In microstructure fibers, the supercontinuum generation in the anomalous dispersion range is connected with the splitting of the input pulse into several fundamental solitons, which emit phase-matched non-solitonic radiation. We show that this mechanism of SC generation is also effective in rib waveguides, because waveguide contribution to dispersion yields a broad range of anomalous dispersion. Due to the presence of two zero-dispersion wavelengths, non-solitonic radiation is emitted at both red- and blue-shifted wavelengths. As a result of our study we predict that for certain waveguides and input pulse parameters a 2-octaves-broad supercontinuum can be achieved in a planar rib waveguide.