We report on systematic experimental mapping of the transmission propertiesof two-dimensional silicon-on-insulator photonic crystal waveguides for a broadrange of hole radii, slab thicknesses and waveguide lengths for both TE and TMpolarizations. Detailed analysis of numerous spectral features allows a directcomparison of experimental data with 3D plane wave and finite-differencetime-domain calculations. We find, counter-intuitively, that the bandwidth forlow-loss propagation completely vanishes for structural parameters where thephotonic band gap is maximized. Our results demonstrate that, in order tomaximize the bandwidth of low-loss waveguiding, the hole radius must besignificantly reduced. While the photonic band gap considerably narrows, thebandwidth of low-loss propagation in PhC waveguides is increased up to 125nmwith losses as low as 8$\pm$2dB/cm.
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