Analysis and Digital Predistortion of in-Band Cross Modulation in Concurrent Multi-Band Transmitters

Hahn, Yunsik; Martinez-Lopez, Jose I.; Roblin, Patrick; Alsulami, Ruwaybih; Popovic, Zoya; Chen, Vanessa

doi:10.1109/ACCESS.2022.3222367

We demonstrate band flip in one-dimensional dielectric photonic lattices presenting numerical and experimental results. In periodic optical lattices supporting leaky Bloch modes, there exists a second stop band where one band edge experiences radiation loss resulting in guided-mode resonance (GMR), while the other band edge becomes a nonleaky bound state in the continuum (BIC). To illustrate the band flip, band structures for two different lattices are provided by calculating zero-order reflectance with respect to wavelength and incident angle. We then provide three photonic lattices, each with a different fill factor, consisting of photoresist gratings on Si 3 N 4 sublayers with glass substrates. The designs are fabricated using laser interferometric lithography. The lattice parameters are characterized and verified with an atomic force microscope. The band transition under fill-factor variation is accomplished experimentally. The measured data are compared to simulation results and show good agreement.

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