Nokia Bell Labs, Deutsche Telekom's T-Lab Lab, and Technical University of Munich (TUM) have achieved unprecedented transmission capacity and spectral efficiency with a new modulation technique in a fiber-optic field trial. This groundbreaking advance expands the capacity of optical networks to meet the proliferation of data communications needs.

In a field trial of fiber optic communications, Nokia Bell Laboratories, Deutsche Telekom's T-Lab and Munich Institute of Technology demonstrated that when tunable transmission rates dynamically adapt to channel conditions and traffic demands, the optical network The flexibility and performance can be maximized. As part of the SafeandSecureEuropeRouting (SASER) project, this experiment, conducted on Deutsche Telekom's already deployed fiber-optic network, achieved a 1Tb / s transfer rate.

This is already close to the theoretical maximum of the channel's information rate and hence to the Shannon limit of the fiber link. The Shannon limit was discovered in 1948 by Bell Labs pioneer and Claude Shannon, Father of Information Theory.

New modulation method

This new modulation scheme, called Probabilistic Consonance Shaping (PCS), uses the Quadrature Amplitude Modulation (QAM) format to achieve higher transmission capacity on a given channel, significantly improving the optical communication spectrum effectiveness.

PCS modifies the constellation point - the alphabet of the transmission - the probability used. In general, all constellation points are used at the same frequency. PCS cleverly uses signals that have large constellation points to transmit at lower frequencies than small amplitude constellation points, so that, on average, it has better adaptability to noise and other impairments. This enables the transmission rate to be adjusted to perfectly adapt to the transmission channel, resulting in a 30% capacity increase.

Maximum transmission capacity

Optical fiber has been introduced for 50 years. With the advent of 5G wireless technology, today's optical transmission systems continue to evolve to help telecom operators and enterprises meet network data communications at a CAGR of up to 100%.

PCS has now become a part of this evolution by increasing the flexibility and performance in the fiber without increasing the complexity of the optical network, resulting in faster data communications and greater distances for transmission.

This research is a key milestone in demonstrating that PCS can be used to extend optical communications technologies in the future. The results of this joint experiment were reported on the European Conference on Optical Communications (ECOC) 2016, September 19, Dusseldorf, Germany.

Transfer data faster, farther and with unparalleled flexibility

"Adding capacity, coverage and flexibility to already-deployed fiber optic infrastructure," said Bruno Jacobs Hoferborn, Technical Director of Deutsche Telekom and CTO of Deutsche Telekom. "Deutsche Telekom provides a unique network infrastructure to evaluate and demonstrate similar Of highly innovative transmission technology in the future, it will also support a higher level of test scenarios and technologies. "

"Information theory is the mathematics of digital technology and it is an exciting event to see his thinking continue to change in industry and society as the year celebrates the centenary of 2016 by Claude Shannon." The Institute of Communication Engineering at the Technical University of Munich Professor Gerhard Kramer said.

"Probability constellation shaping, an idea that won the Bell Labs Award, directly applies Shannon's principles and enables fiber optic systems to spread data faster, farther and with unmatched flexibility," adds Professor Kramer. "The close cooperation between Nokia Bell Laboratories, which develops the technology and T-Labs Laboratories, which tests the technology in real world conditions, is a perfect example of the engineering excellence of Munich Institute of Technology as a label whose quality Teaching gives our students intellectual tools to compete, succeed and lead globally.

Marcus Weldon, chairman of Nokia Labs and chief technology officer at Nokia, said: "The future of optical networks needs to support not only capacity on the order of a few orders of magnitude, but also the ability to dynamically adapt to channel conditions and traffic requirements." Probability constellation shaping enables optical networks, Operating near the Shannon limit, supporting the massive data center interconnection and providing the flexibility and performance required by modern networks in the digital age provides operators and businesses with significant benefits.

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