a) 3D spiral waveguide. (b) Suspended air-bridge waveguide; inset shows the input and output coupling sections. (c) 30Gb/s NRZ and (d) 56Gb/s PAM4 eye diagram of the 3D Printed Waveguide output.
For most design engineers, study of waveguide technology ended when they got their last degree. The only time waveguide comes up is to use it as a last resort in applications such as millimeter-wave ...
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