Figure 3: Experimental characterization of the PhC waveguides.
From: Integrable microwave filter based on a photonic crystal delay line
(a) Dispersion (group index versus wavelength, green solid line) and (red) excess transmission loss (that is, transmission normalized to maximum) of the TE even mode of the waveguide corresponding to the design with anti-symmetric shift (see Fig. 2c). The waveguide length is 1.5 mm. The vertical dashed lines correspond to the +3.5 and +7-dB extra-loss level and connect to the corresponding group index (14 and 21) and delay (~70 and 105 ps). (b) Excess loss versus the group index for the waveguide used for the delay line (blue, same data as in Fig. 3a) compared with a reference sample with different design (red) used in the experiment by Roy35. (c,d) Measurements in the microwave domain of the sample referenced in Fig. 2d. Relative delay (c) and power variation (d) of the microwave signal as a function of the wavelength of the optical carrier and the microwave frequency.
