Recent advances in the field of photonics and topological physics can be combined to offer a solution to planar 6G, above 100 GHz, communication devices. As specific examples, we demonstrate that a hybrid photonic crystal waveguide can support a single-mode transmission covering 0.367–0.411 THz (over twice as wide as that of all-silicon photonic crystal waveguides). By breaking the photonic crystal symmetry, topologically protected modes can be introduced with a single mode linear-dispersion transmission window (over 0.143–0.162 THz) and robust transmission around sharp corners without any deterioration in the bandwidth. Such topologically protected waveguides, here produced using simple 3D printing techniques, offer a unique simplification in design. The absence of coupling to back-propagating modes removes the requirement to carefully design away spurious resonances, offering a pathway to a truly versatile planar platform for integrated 6G devices with low loss and wide bandwidth.
We propose the feasible design of a device that can offer a unique method for controlling the terahertz spectrum allocation, exploiting existing photonics-based technologies. We successfully designed a multiplexer and demultiplexer using arrayed waveguide grating, where the device can multiplex and demultiplex four frequency channels (8.64 GHz bandwidth) in the same operating range defined by the IEEE 802.15.3d standard with at least 10 dB separation. This study reveals that proposed solution play a major role in maturing the next generation wireless communication (beyond 100 GHz) networks.
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