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Institute of High-Frequency Technology Publishes Research Report

The Institute of High-Frequency Technology at the HfTL has published its research report for 2009 - 2011. Led by Prof. Dr. Thomas Schneider, the institute cooperates with international partners to conduct research on cutting-edge projects. Last year, Prof. Schneider received the Deutsche Telekom Patent award for his successful research work

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Generation of ultra-narrow, stable and tunable millimeter- and terahertz- waves with very low phase noise

The interference between two spectral lines of the frequency
comb of a fiber femtosecond laser is used to generate millimeter-wave
and terahertz tones. The two lines are selected by stimulated Brillouin
scattering (SBS) amplification. All other modes are strongly rejected based
on polarization discrimination, using the polarization-pulling effect that is
associated with SBS. The inherent high spectral quality of a femtosecond
fiber laser comb allows generation of millimeter- and terahertz waves with
linewidths below 1 Hz, and a phase noise of -105 dBc/Hz at 10 kHz offset.
The generation, free-space transmission and detection of continuous waves
at 1 THz are demonstrated as well. Lastly, the generated millimeter-wave
carriers are modulated by 40 Gbit/s data. The entire system consists of a
fiber laser and standard equipment of optical telecommunications. Besides
metrology, spectroscopy and astronomy, the method can be utilized for the
emergent field of wireless millimeter-wave and THz-communications at
ultra-high data rates.

Full Article


Multiplierless Reversible Colour Transforms and their Automatic Selection for Image Data Compression

The efficient compression of colour images requires
a step which takes the dependencies between the colour components
into account. This is mostly realised with a colour
transformation mapping the red, green and blue components into
another representation. The transformation must be reversible if
the compression system is to support the lossless reconstruction
of the images.

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The EMC Centre Research Cooperation

Measurement setup in the EMC chamber at the HfTL

One year has passed since the EMC Centre Leipzig was founded as part of the Research and Transfer Centre (FTZ) in a joint research project between the HfTL and the Leipzig University of Applied Sciences (HTWK). Successful research has been conducted in the labs of both institutes ever since. The main objective is to consult and support regional SMEs regarding electromagnetic compatibility (EMC) during the development of components, appliances, and products.

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Cloud Computing for small and medium-sized enterprises

Opportunities and risks associated with cloud computing for small and medium-sized enterprises
SMEs are faced with the challenge of making computing more secure and more effective without access to the resources or experts needed. This is where cloud computing presents itself as a cost-effective alternative to local IT infrastructures. The various advantages and disadvantages of cloud computing must be taken into consideration. Recent studies have shown that compliance with data protection laws and high security standards are possible with cloud computing. We will discuss important parts of the SLA (service level agreement) and how they can be monitored. The article will cover technical and organisational issues which will have to be addressed by the ICT industry in the upcoming years in order to meet the market requirements.

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JobMining@HfTL – an innovative project to identify training needs in ICT companies

Text-Mining-System

The very short ICT technology cycles in today’s age pose a problem for many businesses: how to provide the right amount of training, with the right topics and at the right time. This problem is exacerbated by constant downsizing of budgets dedicated to further training. Educators are faced with the challenge of identifying important topics early on, to evaluate economic aspects, and to develop selected topics into educational products.

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