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Schematic diagrams of index-chirped PC waveguide devices. (a) Simple chirped waveguide. (b) Group delay device composed of two different chirped waveguides in a directional coupler structure.
Waveguide structures and photonic band diagrams calculated by the plane wave expansion method. In this calculation, , channel width , and the background index is fixed to 2.963. (a) Waveguide A. (b) Waveguide B with .
Spatial distributions and input/output time wave forms of light intensity (square of the magnetic field normal to the 2D plane). An input pulse of is assumed. (a) Simple chirped waveguide with . (b) Group delay device with and three airhole lines separating waveguides A and B. Nonchirped waveguides of length are added to both ends. The effective length for light localization is measured to be .
Group delay time with chirped waveguide length and effective length . The delay time is estimated from peak to peak of input and output pulse. Pulse width is taken as a parameter.
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