Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Fraunhofer HHI have developed a novel single-polarization Kramers-Kronig receiver scheme

16.03.2018

Fraunhofer Heinrich Hertz Institute HHI developed a distributed superchannel aggregation scheme to demonstrate ultra-wideband single-photodiode reception based on inherently polarization-aligned Kramers-Kronig (KK) carrier generation at the receiver. For optimized conditions, a record net capacity of 400 Gb/s was achieved using a distributedly aggregated superchannel of 3×33 GBd 32QAM sub-carriers.

The need to establish and implement high capacity, simplified and cost-effective direct-detection (DD) schemes for short reach systems, such as data center interconnect (DCI), is propelling optical communication industries to find innovative techniques to realize these goals.


Fraunhofer Heinrich Hertz Institute HHI developed a distributed superchannel aggregation scheme to demonstrate ultra-wideband single-photodiode reception based on inherently polarization-aligned Kramers-Kronig (KK) carrier generation at the receiver. For optimized conditions, a record net capacity of 400 Gb/s was achieved using a distributedly aggregated superchannel of 3×33 GBd 32QAM sub-carriers.

Contrary to other DD schemes, the single-polarization Kramers-Kronig technique allows the reception of complex modulation formats with a single photodiode by additionally using a Kramers-Kronig carrier, which needs to be polarization-aligned to the data signal. To avoid receiver-based polarization control, the KK carrier is usually co-generated at the transmitter.

In contrast to this already existing scheme, researchers at Fraunhofer HHI have developed a novel single-polarization Kramers-Kronig receiver scheme, which is based on the generation of an inherently polarization-aligned Kramers-Kronig carrier in the receiver.

The combination of a distributed superchannel aggregation based on optical bus topology and the receiver-based KK carrier generation, enables KK reception of ultra-wideband signals without using ultra-wideband transmitters.

The researchers distributedly aggregate a 3×33 GBd superchannel spanning more than 100 GHz with a 495 Gb/s gross rate using the bus topology concept. In the scheme, a master continuous wave (CW) is propagated through the bus and collects locally generated sub-carriers (SCs) of each optical node along the bus. In the receiver, a similar node is used to generate the KK carrier.

As the polarizations of the superchannel and the generated KK carrier are determined by the state-of-polarization (SOP) of the incoming master CW, automatic polarization alignment of the KK carrier and the data is achieved without the need for polarization tracking.

Each SC in the superchannel was detected with error-free performance and a 400 Gb/s payload was achieved. This is the highest capacity reported so far for single-polarization single-photodiode KK reception.

By applying this technology to short reach and metro-haul optical networks (e.g., data center interconnect), the cost and complexity of the communications environment could be reduced.

Details of this technology were presented during OFC 2018.

Weitere Informationen:

https://www.hhi.fraunhofer.de/en/press-media/press-releases.html

Anne Rommel | Fraunhofer-Institut für Nachrichtentechnik, Heinrich-Hertz-Institut, HHI

More articles from Physics and Astronomy:

nachricht Appreciating the classical elegance of time crystals
20.09.2019 | ETH Zurich Department of Physics

nachricht 'Nanochains' could increase battery capacity, cut charging time
20.09.2019 | Purdue University

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: 'Nanochains' could increase battery capacity, cut charging time

How long the battery of your phone or computer lasts depends on how many lithium ions can be stored in the battery's negative electrode material. If the battery runs out of these ions, it can't generate an electrical current to run a device and ultimately fails.

Materials with a higher lithium ion storage capacity are either too heavy or the wrong shape to replace graphite, the electrode material currently used in...

Im Focus: Stevens team closes in on 'holy grail' of room temperature quantum computing chips

Photons interact on chip-based system with unprecedented efficiency

To process information, photons must interact. However, these tiny packets of light want nothing to do with each other, each passing by without altering the...

Im Focus: Happy hour for time-resolved crystallography

Researchers from the Department of Atomically Resolved Dynamics of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg, the University of Hamburg and the European Molecular Biology Laboratory (EMBL) outstation in the city have developed a new method to watch biomolecules at work. This method dramatically simplifies starting enzymatic reactions by mixing a cocktail of small amounts of liquids with protein crystals. Determination of the protein structures at different times after mixing can be assembled into a time-lapse sequence that shows the molecular foundations of biology.

The functions of biomolecules are determined by their motions and structural changes. Yet it is a formidable challenge to understand these dynamic motions.

Im Focus: Modular OLED light strips

At the International Symposium on Automotive Lighting 2019 (ISAL) in Darmstadt from September 23 to 25, 2019, the Fraunhofer Institute for Organic Electronics, Electron Beam and Plasma Technology FEP, a provider of research and development services in the field of organic electronics, will present OLED light strips of any length with additional functionalities for the first time at booth no. 37.

Almost everyone is familiar with light strips for interior design. LED strips are available by the metre in DIY stores around the corner and are just as often...

Im Focus: Tomorrow´s coolants of choice

Scientists assess the potential of magnetic-cooling materials

Later during this century, around 2060, a paradigm shift in global energy consumption is expected: we will spend more energy for cooling than for heating....

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Optical Technologies: International Symposium „Future Optics“ in Hannover

19.09.2019 | Event News

Society 5.0: putting humans at the heart of digitalisation

10.09.2019 | Event News

Interspeech 2019 conference: Alexa and Siri in Graz

04.09.2019 | Event News

 
Latest News

Quality control in immune communication: Chaperones detect immature signaling molecules in the immune system

20.09.2019 | Life Sciences

Moderately Common Plants Show Highest Relative Losses

20.09.2019 | Life Sciences

The Fluid Fingerprint of Hurricanes

20.09.2019 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>