A photonic switching structure includes a first macromodule, where the first macromodule includes an array of switch matrix photonic integrated circuit (PIC) nodes having a first row, a second row, a first column, and a second column and a first optical splitter optically coupled to PIC nodes in the first row. The first macromodule also includes a second optical splitter optically coupled to PIC nodes in the second row and a first output selector optically coupled to PIC nodes in the first column. Additionally, the first macromodule includes a second output selector optically coupled to PIC nodes in the second column and a first collision detector coupled to PIC nodes in the first column. Also, the first macromodule includes a second collision detector coupled to PIC nodes in the second column.