Fig. 2
From: Programmable space-frequency linear transformations in photonic interlacing architectures
Design rules and device scalability. (a) Sketch of the generalized N-port interlaced design showcasing the relevant components. (b) Dispersive waveguide array section incorporating the coupling region, routing Bézier arms of length \(L^{(\text {arm})}\) and width \(s^{(\text {arm})}\), and L-bends of length \(L^{(\text {bend})}\) and separation \(s^{(\text {MH})}\) for thermal isolation purposes. (c) Zoomed-in view illustrating the waveguide separation \(s_{p}\), for \(p\in \{1,\ldots ,N-1\}\), and the coupling length \(L^{(\text {WGA})}\). (d) Typical structure of a metal heater performing the phase control, with \(L^{(\text {MH})}\) the total length of the metal layer.
