Profile
Department of Transmission and Optical Technologies (DTO) conducts scientific, research and implementation works pertaining to issues of a advanced optical communications. In particular it performs research on ultra-fast transmission in terabyte optical transparent networks, wavelength multiplexing (DWDM and CWDM) in optical networks, optical fiber access (FTTH), non-linear optical effects, application of innovative photonic crystal technologies, microstructured optical fibers and quantum communications, methods for measurement and compensation of polarization mode dispersion (PMD), reliability of optical components and networks, implementation of optical IP networks, assurance of Quality of Service (QoS) and convergence of broadband wireless and optical networks. In addition, the department runs an accredited fiber optic test laboratory, performing conformance and certification testing of optical fiber cables and passive components.
Moreover, DTO has annually organized the International Conference on Transparent Optical Networks (ICTON) since 1999. This event obtains technical support of IEEE/LEOS and collected more than 300 scientific presentations in 2009.
Competence
- Modelling of physical constrains in different optical communication systems: analogue, fiber access networks (FTTH-PON), DWDM and ultra-fast terabyte transmission, using self-developed Fiber Optic Communication System Simulator.
- Modelling, design, and optimization of modern optical communication networks taking into account the quality of transmission (QoT), the quality of service (QoS) and physical layer impairments (PLI).
- Expertise in photonic crystal technologies, micro-structured optical fibers (PCF) and sub-wavelength photonics.
- Characterization of transmission, mechanical and thermal properties of non-standard optical fibers, including micro-structured and doped active fibers, also when subjected to various mechanical and environmental factors like temperature cycling, accelerated aging, crush, vibrations, etc.
- Expertise in installation techniques of fiber cables in local, access, metro and core networks.
- Consultancy and training services for operators and installers of fiber networks, including DWDM, FTTH and high speed core networks.
- Conformance and certification testing of optical fiber cables and passive components (e.g. connectors) to Polish and international standards.
- Measurements in optical fiber networks (PMD, OTDR, etc.).
Achievements in 2009
- Participation in European research COST Action 291 "Towards Digital Optical Networks" concerning following areas:
- Modelling of optical systems with multilevel modulation formats (M-PSK and M-QAM) has been developed, taking into account physical constraints. Moreover, statistical methods describing properties of nonlinear noise compensation was used to improve design process of long distance fiber optic communication systems. Multi-Symbol Phase Estimation used to improve differential M‑PSK detection was simulated and usefulness of this technique was confirmed.
- Different strategies to find optimal step-size distribution used in Split-Step-Fourier-Method (SSFM). Novel Pre-simulated Local Error Method was proposed which halves simulation time, accurately indicates the global accuracy and is more stabile than conventional S-SSFM method. Moreover, multi-band methods, specific to WDM systems, have been analyzed as well. All analyzed method has been implemented in our Fiber Optic Communication System Simulator.
- Research on guaranteed Quality of Service (QoS) and routing in Optical Burst Switched (OBS) networks was carried on, including strategies of isolated alternative routing in labelled, connection-oriented networks (LOBS) with offset time-emulation and multi-path routing optimization in OBS networks, the presented solution is based on nonlinear optimization.
- Research on usability of convergent, transparent optical networks to transmit real-time services and packet and data services, including fast Ethernet 100GbE/1000GbE, was carried on within COST Actions: 291 and 293 "Graphs and Algorithms for Telecommunication Networks" in co-operation with international standard bodies: ITU-T SG15 and IEEE High Speed Study Group for Ethernet Network.
- Participation in COST Action 299 “FIDES” focused mainly on characterization of optical, mechanical and thermal properties of photonic crystal fibers (PCF) and active ytterbium-doped fibers. Applicability of established measurement techniques was assessed for the above mentioned special fibers of various designs. The most important conclusions are as follows:
- influence of temperature and mechanical stress (twist, elongation) on polarization properties of PCF depends on fiber design, which allows to prepare PCF tailored to specific requirements; some PCFs tested can be used to make PMD etalons and emulators;
- splicing of PCFs to standard single mode fibers can be done with typical equipment, but procedure must be individually adjusted;
- influence of temperature and stress on loss of PCF and PCF-SMF splices is negligible;
- Yb2O3 doped fibers have significantly lower tensile strength in comparison to standard fibers;
- participation in COST 299 work on standardization of optical fiber sensors was finished with submission of IEC Draft standard.
- Proposal for a new COST Action “OFSeSa” devoted to optical fiber sensor technologies get preliminary acceptance.
- Participation in and coordination of COST (European Cooperation in Science and Technology) Action MP0702: Towards Functional Sub-Wavelength Photonic Structures (2008–2012), Chairman – Marian Marciniak.
Contact
Head of Department: Marian Marciniak, DSc, Associate Professor
Phone: (+48) 22 5128 715
e-mail:
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Secretary: Hanna Skrobek
Phone: (+48) 22 5128 715
Fax: (+48) 22 5128 347
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