Fig. 2: 8-channel programmable photonic Mach–Zehnder mesh.
From: Programmable photonic integrated meshes for modular generation of optical entanglement links
a Schematic of the basic building blocks of the photonic integrated mesh: a Mach–Zehnder interferometer (MZI), consisting of four optical phase-shifters and the on-chip power monitoring element, consisting of a pick-off beam splitter and grating couplers. b Full diagram of the 8 × 8 programmable Mach–Zehnder mesh. c Optical microscope image of the fully fabricated photonic circuit with optical and electrical I/O labeled. d DC response when actuating phase shifts θ1-θ2 in a single Mach–Zehnder element, showing a Vπ ~25 V. e AC response when actuating phase shifts θ1-θ2 in a single Mach–Zehnder element, showing a relatively flat frequency response until a peak mechanical resonance at ~10 MHz.
