Poznan University of Technology, Faculty of Electronics and Telecommunications, Poland, Higher Education (HE)

Jan Lamperski
Ul. Polanka 3
60-965 Poznan
Poland
Phone: +48 61 665 3809
Fax: +48 61 665 3830
E-Mail: jlamper@et.put.poznan.pl
http://www.et.put.poznan.pl

Description and expertise of the organisation:
Poznan University of Technology (PUT) is a nine-Faculty university that educates about twenty thousand students at twenty three majors. High level of education, qualifications of research personnel make PUT one of the best technical universities in Poland.
PUT is a member of international organizations, such as CESAER , IAU, SEFI, EAIE, AUDEM. PUT cooperates with international educational and research institutions: it has more than 100 bilateral contracts and agreements with foreign partners.
The Faculty of Electronics and Telecommunications (FET) at PUT is one of the top rated research and educational institutions in Poland. The FET was established in 1974, as the Institute of Electronics and Telecommunications. In 2006 it was converted into Faculty of Electronics and Telecommunications.
The faculty consists of four chairs.
The Chair of Wireless Communications concentrates on several aspects of wireless information systems and networks, theory of digital communication systems, information and coding theory, computer simulation techniques, and automated synthesis and testing of VLSI digital circuits.
The Chair of Telecommunication and Computer Networks at FET is involved in research concerning networking technologies that have emerged in the last few years. Particular interests focus on traffic theory, broadband networks, Internet and billing systems.
The Chair of Multimedia Telecommunications and Microelectronics at IET studies a broad array of topics involving multimedia systems and signal propagation. Projects cover image processing and communications, modeling of signal propagation on interconnections in electronic systems and circuits along with new concepts in the electromagnetic wave propagation theory and antennas.
The Chair of Telecommunication Systems and Optoelectronics at FET is concerned with both theory and practice in the domains of synchronization techniques, photonics and fiber communications, signal processing, design and programming of computer measuring systems, applications of microprocessors, cryoelectronics and nanostructures.
Scientific activity in the area of Photonic and Optical Communications include: ultra dense WDM multiwavelength fiber sources, optical amplifiers, FSO, DWDM discretely tunable optical filters and interferometric method of chromatic dispersion characterization of speciality fibers (PCF, active).

Research interests / Project ideas
The objective of the proposed project is to build a laboratory model and to investigate features of new architectures of UDWDM PON implementing a multiwavelenght optical carrier frequency source / translator module.
In the previous research, we demonstrate results of the investigation on the characteristics of an optical carrier frequency comb generator with the exceptionally stable 1.5 - 3 GHz channel separation.
We tested single and double frequency shifter configurations. The single shifter generator consists of a acousto-optic frequency shifter (AOFS), a master laser and an EDFA. The operation is based on the multiple frequency shift every round trip. The AOFS controlled by a RF generator determines a frequency comb interval. In the double shifter configuration two cascaded AOFS are implemented.
For the single stage configuration up to 84 spectral lines with stable 1.5 GHz spacing were obtained. In the system with two cascaded shifters up to 60 optical carriers with 2.5 GHz separation were obtained.
These results assure us that using proper AOFS would make it possible to adjust optical channel distances to the values of 1.5625 GHz and 3.125 GHz, which correspond to 1/64 and 1/32 part of a standard 100 GHz frequency grid. Considering the results presented above, we believe that an optical comb generator with AOFSs utilising the SAW technology would make it possible to obtain the channel separation of 6.25 GHz.
In the paper “Enabling technology for UDWDM access networks”, Photonics Letters of Poland, (2009) we describe a technological concept for UDWDM access networks utilising a multifrequency acousto-optic frequency translation block as a key functional module. We also proposed configurations which allow the realization of network devices for channel multiplexing with gigahertz spacing such as optical multiplexers and OADMs.
UDWDM systems are currently investigated under project No. 1788/B/T02/2009/37 of Polish Ministry of Science and Higher Education: “Laboratory model of UDWDM transmission system employing optical multicarrier source”.
In Features and applications of fiber multifrequency translator for access networks, XII National Conference ‘Lightguides and their Applications’, Poland, 2009, we proposed an original architectures for PON networks utilizing multifrequency translator / optical comb generator at CO or CO and ONU.
We intend to participate in theoretical and experimental investigations of PON implementing the optical comb source.

Keywords
PON, WDM, DWDM, optical comb generator

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