According to the report on February 27th (Beijing time) by the UK's Nature magazine website, data traveling on the Internet will switch back and forth between the optical signal lines used for transmission and the electrical signals used for processing. Therefore, it is easy to congest the network. Become a bottleneck restricting the speed of the network. Now, Japanese scientists have developed new types of photonic memory devices that use less energy and save data for longer periods of time, allowing information to be transmitted not only in the form of optical signals, but also in the form of optical signals, which is expected to make the Internet more accessible. Fast and efficient. The study was published in the journal Nature Photonics.
Scientists at NTT have been researching such devices for many years, but previously developed devices used too much energy and could not allow data to be stored for a long time. The energy consumption of the new storage unit is only 30 nanowatts, which is three-hundredth of that of the previous device; and it can save the data for one microsecond, which is four times the previous 250 nanoseconds. The main author of the study, NTF's photonic nanostructure research team leader Nafu Masami, said that 1 microsecond is enough to handle the data.
To make these photonic memories, scientists started their research with a thin plate of indium phosphide. In the center of the plate, they buried a section of another photonic material, indium gallium arsenide, as a memory cell. This piece of indium gallium arsenide is about 4 microns long and 300 nanometers wide. Scientists have etched some nanoholes in indium phosphide to create a structure that can only transmit light at certain wavelengths; a path through the middle of the memory cell is not etched to direct light in and out. When light of a specific wavelength is irradiated on the memory cell, the refractive index of indium gallium arsenide changes so that it can only transmit one kind of light pulse. They use lasers to read information from a photonic storage device or write information to a photonic storage device, and use another laser to provide a steady background light to help the storage unit maintain its state.
Next, they integrated four such memory cells on the same chip. Nao Fujimi said that the energy consumption of a device made by combining one million such memory cells is only 30 milliwatts, which is much lower than the average power consumption of about 150 milliwatts of flash memory. He and his colleagues are trying to add lasers and photodetectors to add more read and write photonic memory cells to the same chip.
Nafu Masami said: "Our first goal is to use these memory cells to create memory in the network router or server; then, we want to replace the random access memory in high-speed computers."
Professor Chang Ruihua, director of the Nanometer Photoconductor Technology Center at the Department of Electronic Engineering and Computer Science at the University of California, Berkeley, expressed his excitement about the equipment developed by NTT. She said: "The internet data congestion is increasing year by year, and it is imperative to use photonic storage units for data routing." (Reporter Liu Xia)
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