Fig. 1
From: Programmable space-frequency linear transformations in photonic interlacing architectures
Reconfigurable programmable PIC design. (a) Block diagram of the proposed \(4\times 4\) unitary and programmable device. This design features low-dispersive mixing layers that work together to create a richer dispersive response. (b) Schematic representation of the proposed PIC, illustrating the dispersive waveguide arrays (passive units) and the phase shifters (active units) utilized in the interlacing structure. (c) Image of the as-fabricated packaged chiplet on the PCB assembly with optical fiber array and electrical wiring. (d) Image of the fabricated PIC. Lines starting near the bottom are the electrical traces connecting the metal heaters. (e) SEM micrograph of a zoomed-in view of the four-port waveguide array section. (f-i) Electromagnetic wave simulations of the proposed PIC at the central wavelength of 1550 nm. The phase elements have been simulated by changing the effective index of the waveguide arms to introduce desired phase changes. The phases were tuned to achieve the permutation \(\sigma (4,3,2,1)\) (cross routing), which routes light from input to output as \(1\rightarrow 4\) (f), \(3\rightarrow 2\) (g), \(2\rightarrow 3\) (h), and \(4\rightarrow 1\) (i). The simulations were conducted using COMSOL Multiphysics43.
