AUTH: the fastest RAM in the world

Members of Wireless and Photon Systems and Networks Research Group (ERAFOS) of AUTh created the fastest RAM in the world, which stores light instead of electricity.

The researchers replaced the electronic memory with a corresponding random access optical RAM circuit, which supports data read and write speeds of 10Gb / s (ie 10 billion bits per second), achieving twice the speed of the fastest electronic memories RAM made by world-renowned IT companies such as Intel and IBM!


The research team consists of Dr. Christos Vagiona, the Dr. Theoni Alexoudi, the PhD Candidate Apostoli Tsakyridis, the Assistant Professor of the Department of Informatics of AUTh, Nikos Plero and the Associate Professor of the Department of Informatics of AUTh, Amalia Miliou

The study was published in the prestigious journal Optics Letters (DOI 10.1364 / OL.44.001821), one of the largest scientific journals in optical technologies, issued by Optical Society of America. In addition, the international scientific journal "Optics and Photonics News magazine » published an extensive relevant article and hosted an interview with Dr. Ch. Vagionas (

The scientific achievement, which is the product of a long-term effort of the AUTh research team that started in 2009, solves a long-standing computer problem, also known as the "Wall of Memory".

According to this, the speeds of random access RAMs increase for more than 30 years at a much slower rate than the corresponding processor speeds, resulting in an ever-increasing gap between the performance of processors and RAMs, as the processor will have to "wait" to receive data from slow memory, so it can not process it quickly and delay other processes.

The "heart" of optical RAM consists of fast optical switches, the equivalent of electronic transistors in photon technology, interconnected in a standard two-state optical device, "0" and "1", while a third optical switch controls whether the Read or Write to memory function is performed.

As light cannot be "trapped" spatially and therefore stored as easily as electrons and electronic memories, the team implemented a technique that utilizes two interdependent but different wavelengths: when the one wavelength dominates within the proposed device-memory, then forces the other to remain off, so by assigning the digits 1 and 0 to the two different wavelengths digital storage is achieved.

Even better performance is predicted in the future, as the research team intends to study optical memories of higher capacity, with multiple memory cells, which take advantage of the different wavelengths of light.

The innovative research ideas of the AUTh team are funded by the Hellenic Foundation for Research and Innovation (ELIDEK) and the General Secretariat for Research and Technology (GSRT) through the CAM-UP research projects. Scientific Officer Dr. Christos Vagionas) and ORION ("Optical Random Access Memories with low power consumption for fast response and high efficiency in computing environments", with Scientific Officer Dr. Theoni Alexoudi).




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