As shown in Figure 7., it can be seen that the Bragg period of the TE mode and the TM mode gradually increases with the increase of the wavelength, and the Bragg period of the TM mode is much larger than that of the TE mode in the entire wavelength range.
As shown in Figure 7, it can be seen that as the wavelength increases, the Bragg period of TE mode and TM mode gradually increases, and the Bragg period of TM mode is much larger than that of TE mode throughout the entire wavelength range,
As shown in fig. 7, it can be seen that the Bragg period of TE mode and TM mode increases gradually with the increase of wavelength, and the Bragg period of TM mode is much larger than that of TE mode in the whole wavelength range.