1 The world’s first Petabit / S transmission using a single-core multimode fiber optic

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  • Transmitting world records of 1 petabit per second in a multi-mode optical fiber increases the data of the current multimode optical fiber record by more than 2.5 times.
  • Broadband optical transmission is demonstrated for the first time in 15-way fibers, enabled by multiplexer modes and a transmission fiber
  • optimized for high optical bandwidth.
    This exhibition advanced the transmission of high-density and high-capacity optical fibers that can be produced with standard methods.

A team of researchers from the National System of Information and Communication Technologies (NICT, Japan) Network System Research Institute (NICT, Japan) led by Georg Rademacher, NOKIA Bell Labs (Bell Labs, USA) and Nicolas K. Fontaine Prysimian Group (Prysimian, France) Pierre Sillard leads the world’s first transmission to exceed one second of petabit in single-core multi-mode fiber optics. This increases the transmission of the current register of a multi-mode fiber by 2.5 factors.

Until now, fiber-optic transmission experiments that supported many modes were limited to small optical bandwidths. In this study, we showed the possibility of combining spectral and efficient broadband optical transmission with fiber optics that guided 15 fiber modes with a coating diameter, in line with the current industry 0.125 mm. This was enabled by multiplexer modes and an optical fiber that supported a broadband transmission of more than 80 nm over a distance of 23 km. The study highlighted the potential of single-mode multi-mode fibers for high-capacity transmission using processes that manufacture fibers used to produce standard multi-mode fibers.

The results of this study were approved at the 46th European Conference on Optical Communication (ECOC 2020) for the post-deadline session.

Experimental configuration of Petabit transmission

Experimental configuration. Credit: National Institute of Information and Communication Technologies (NICT)

Background

Over the past decade, intensive research has been conducted around the world using data division multiplexing to increase data speeds in optical transmission systems to meet the demands of exponentially increasing data transmission. Compared to multi-core optical fibers, multi-mode fibers support a higher spatial signal density and are easier to manufacture. However, the use of multi-mode multiplexed fibers for space distribution requires the use of computationally intensive processing of digital signals. These requirements increase with the number of transmission modes and the implementation of transmission systems that support a large number of fiber modes is an active area of ​​research.

High-capacity demonstrations of multi-mode fibers

Previous high-capacity demonstrations of multi-mode fibers. Credit: National Institute of Information and Communication Technologies (NICT)

Achievements

At NICT, a transmission experiment using multiplexers developed by Prysmian and multiplexers of modes developed by Bell Labs was designed and conducted. At NICT, a broadband transceiver subsystem was developed to transmit and receive hundreds of channels with an efficient high-quality WDM signal spectral channel. The multiplexers of the new mode were based on the process of converting multi-plane light, where the light from the 15 input fibers was reflected several times in a phase plate to match the modes of the transmission fiber. The transmission fiber was 23 km long and had a graduated index design. It was based on multi-fiber fiber designs that were optimized for broadband operation and had a coating diameter of 0.125 mm and a coating diameter of 0.245 mm, both adhering to the current industry standard. The transmission system has demonstrated the first transmission to exceed one petabit per second in a fiber in each mode by increasing the current record display by 2.5 factors.

Increasing the number of modes in a multi-mode fiber transmission system increases the computational complexity of the required MIMO digital signal processing. However, the transmission fiber used had low modal delay, simplifying MIMO complexity, and this low modal delay maintained high optical bandwidth. As a result, we could demonstrate the transmission of 382 wavelength channels, each modulated with 64-QAM signals. Using a single-core multimode optical fiber, with the success of high-capacity transmission, high spatial signal density, and easy-to-manufacture technology, high-capacity multimode transmission technology is expected to advance for high-capacity optical transmission systems in the future.

Forecasts for the future

In the future, we would like to seek the opportunity to extend the distance of high-capacity multi-mode transmission and integrate it with multi-core technology, with great potential to lay the foundations of future optical transmission technology.

An article on the results of this experiment was published at the 46th European Conference on Optical Communication (ECOC2020, 6 to 2020), one of the largest international conferences related to fiber optic communication. It was planned to take place in Brussels (Belgium), but it had to be carried out almost as a result of the Corona Virus Virus epidemic. The article received a very high rating and was approved for submission in a special session for the final research (Post Dead Paper) held on December 10th.

Meeting: European Conference on Optical Communication (ECOC2020)

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