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In this paper, we introduce a one‐dimensional (1‐D) microstrip photonic bandgap (PBG) filter with only one bandgap (without harmonic response) and without etching in the ground plane. The structure has a sinusoidal variation of the characteristic impedance as a function of the length of the microstrip line. Three examples of the proposed filter are presented. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 29: 418–420, 2001.

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Complex photonic-integrated circuits (PIC) may have strongly non-planar topologies that require waveguide crossings (WGX) when realized in single-layer integration platforms. The number of WGX increases rapidly with the complexity of the circuit, in particular when it comes to highly interconnected optical switch topologies. Here, we present a concept for WGX-free PIC that relies on 3D-printed freeform waveguide overpasses (WOP). We experimentally demonstrate the viability of our approach using the example of a 4 × 4 switch-and-select (SAS) circuit realized on the silicon photonic platform. We further present a comprehensive graph-theoretical analysis of different n × n SAS circuit topologies. We find that for increasing port counts n of the SAS circuit, the number of WGX increases with n 4 , whereas the number of WOP increases only in proportion to n 2 .

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