Fig. 3: Architecture of micromechanically resonant 1 × N and N × N integrated optical switches.
From: Synchronous micromechanically resonant programmable photonic circuits
a Schematic of a general 1 × N optical switch implemented as a binary tree mesh of Mach-Zehnder interferometers (MZIs) with transfer function Tij. b Design of a resonantly actuated 1 × 8 optical switch operating at three distinct frequencies, each unique to a column of MZIs. c Examples of driving signals in time domain to each of the MZIs with appropriate phase offsets. Each signal oscillates between bar and cross switching states. d Theoretical normalized optical intensity of the 8 output channels plotted in time domain when the circuit in (b) is driven with the signals in (c). e Schematic of a resonantly actuated 4 × 4 matrix switch consisting of 8 individual 1 × 4 switches connected through a 16 × 16 passive router. The individual switches are programmed with different driving signals to facilitate a proper switching order. f Example periodic transmission and receiving pattern through the 4 × 4 matrix switch.
