High-Capacity Optical Transport Networks

Multi-mode / Multi-core Transmission

The steadily growing traffic in fiber-optic communication networks requires an increased transmitted capacity per fiber. This can be achieved by using space-division multiplexing (SDM) in several independent cores per fiber for transmission.

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Advanced Modulation Formats

Using advanced modulation formats encoding multiple bits per transmitted symbol is a promising approach to increase spectral efficiency.

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Optical Time Division Multiplexing

Optical time division multiplexing (OTDM) is a powerful and scalable technique to investigate high-speed data transmission systems, related signal processing and monitoring technologies at serial data rates beyond the bandwitdh limitation of (opto-)electronics.

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OFDM / Nyquist WDM

Driven by the immense need for transmission capacity expected in future optical transmission networks, advanced modulation formats offering high spectral efficiency such as 16QAM or even higher modulation orders are recently considered.

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Software Defined Optics / Flexible grids

Flexible optical transponder technologies will be capable of adapting the transmitted modulation format, symbol rate and signal shape, according to the requirements of the specific link by software reconfiguration.

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Beyond 100G

The demand for bandwidth in our telecommunication networks worldwide has been growing continuously by 50-100% per year for more than a decade, regardless of any economic crises. In recent years a number of new applications such as online gaming, cloud computing, high-definition video streaming, YouTube, Twitter, Flickr, etc. have kept demand growing and this trend is not likely to end. In order to cope with this increasing demand research and innovation in all parts of the telecommunication network are needed.

In the core part of the network, the current challenge is to increase the transported data capacity per wavelength channel to over 100 Gbit/s (Beyond 100G). But at the same time, the cost, power consumption and footprint per transported bit needs to decrease. Different technologies can be employed to achieve this task. The Submarine & Core Systems Group is a partner for research & development in all these fields.