Figure 4: PMC applied as an optical readout memory array.
From: Integrated photonics with programmable non-volatile memory

(a) Optical microscope image of a four-channel MRR memory array coupled with a single bus waveguide. (b) Transmission spectra of different memory states when each of the MRRs are individually programmed. The (0, 0, 0, 0) memory state trace (in dotted RED) is superimposed onto subsequent plots for comparison to the different programmed 4-bit memory states.