After reaching a new record of 1.84Pbit/s in optical fiber communication, the communication rate using standard cladding diameter optical fiber also ushered in a major breakthrough, achieving a transmission rate of 1.53 Pbit/s over 25.9 kilometers, creating a new world record.
The achievement was created by a team of researchers at the Network Research Institute of the National Institute of Information and Communications Technology (NICT, Japan) by encoding information at 55 different optical frequencies (a method called multiplexing) technology, achieving a bandwidth of about 1.53 Pb per second.
This bandwidth is enough to carry the entire world's Internet traffic over a single fiber optic cable, a million times faster than the gigabit fiber speeds used by the average user.
Because each color in the spectrum (visible and invisible light) has its own frequency, different from all other colors, it can be made to carry its own independent information stream. The researchers managed to unlock a spectral efficiency of 332 bits/s/Hz (bits/second/hertz), three times higher than a 2019 experiment that achieved a spectral efficiency of 105 bits/s/Hz.
The researchers managed to transmit information simultaneously in the C-band via 184 different wavelengths. The light is modulated to transmit 55 separate data streams (modes) before being sent over a fiber optic cable, which requires a glass core to transmit all the data. When data is sent, the receiver decodes different wavelengths and patterns, and the distance between the sender and receiver in the experiment was set to 25.9 kilometers.
NICT said that in the future, it will further explore transmission capacity by expanding frequency bands, as well as the basic technologies required for long-distance transmission and network deployment. The results of the experiment were accepted as a post-deadline paper report at the 48th European Conference on Optical Communications (ECOC 2022) and published on Thursday, September 22, 2022, local time.
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