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(a) Calculated frequency dispersion of a line-defect PC-slab WG, where the operation wavelength is denoted by an arrow. (b) Transmittance spectrum observed in the region involving the operation wavelength marked in (a).
Variation of the spectrum of the transmitted light with increasing the coupled power, observed in a long -based photonic-crystal-slab waveguide; the power is (a) , (b) , and (c) . The thick (black), thin (red), and dotted (blue) curves denote the observed spectrum, the spectrum obtained by numerical simulation, and the incident spectrum, respectively. As the coupled power is increased, (b) the spectrum gets broader and (c) develops a double-peak structure due to self-phase modulation.
Plot of output power vs input power coupled to a long -based PC-slab WG. The line denotes the theoretical curve.
Variation of the spectrum of transmitted light with the coupled power, observed at for a similar -based PC-slab WG sample having the transmission range shifted to shorter wavelength by compared to the sample used for Fig. 2. The value of at for this sample is much larger than that at for the latter. The experimental conditions are otherwise the same with those in Fig. 2; the coupled power is (a) and (b) , respectively. The thick (black), red (thin), and dotted (blue) lines denote the observed spectrum, simulation spectrum, and incident spectrum, respectively. Spectrum (b) gets distorted asymmetrically and blueshifts, which is caused by an additional refractive-index change due to TPA-produced free carriers.
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