Journal
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
Volume 26, Issue 2, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSTQE.2019.2956871
Keywords
Optical waveguides; Phase change materials; Optical surface waves; Optical ring resonators; Photonics; Optical imaging; Optical pulse shaping; Nonvolatile memory; multilevel data storage; phase-change materials; photonic integrated circuits
Categories
Funding
- European Union's Horizon 2020 Research and Innovation Program [780848]
- ERC [724707]
- EPSRC [EP/M015173/1, EP/J018694/1, EP/R001677/1, EP/M015130/1] Funding Source: UKRI
- European Research Council (ERC) [724707] Funding Source: European Research Council (ERC)
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All-optical nonvolatile memories enable storage of telecommunication data without detours through electronic circuitry. Phase-change materials provide the means to embed such memories within integrated optical circuits and thus allow combining waveguide devices for information processing with local data storage. Using this concept, we realize an all-photonic memory circuit capable of storing 512 bits of data in an array of nanoscale phase-change devices. We employ multilevel addressing and wavelength multiplexing of microring resonators to write and read a 16 x 16 greyscale image with 2-bit resolution entirely in the optical domain. Our approach holds promise for implementing scalable architectures for on-chip optical data storage with long data retention and ultrafast access times.
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