Fig. 6
From: Programmable space-frequency linear transformations in photonic interlacing architectures
Single-wavelength optimization for sparse matrix representation. Measured intensity transmission matrices for the complete set of 24 (4!) possible \(4\times 4\) permutation matrices. The device was programmed in-situ and operated at a central wavelength of 1550 nm. The label at the top of each panel indicates the specific permutation operation being performed.
