Institute of Microelectronics and Optoelectronics, Warsaw University of Technology, Poland, Higher Education (HE)

Ryszard Piramidowicz
Koszykowa 75
00-662 Warsaw
Phone: +48 22 234 7777, +48
Fax: +48 22 628 8740

Description and expertise of the organisation:
Institute of Microelectronics and Optoelectronics (IMiO) is a part of the Faculty of Electronics and Information Technology – the largest faculty in Warsaw University of Technology. The educational and research activities of the Institute cover a wide spectrum of relevant specialties – among them characterization and research of novel photonic materials and devices, including novel fibers and fiber optic elements for application in modern optical communications.
The team has over two decades of experience in modelling and characterization of optically active structures (including solid state lasers, fiber and waveguide lasers and amplifiers, as well as photonic crystal structures) for application in modern photonics. Recently this research profile has been significantly broadened to include novel composite materials based on polymer hosts as well as versatile characterization of all type of passive and active fiber-optic elements dedicated for application in optical communication networks.
The main experimental tools disposed by IMiO team are located in two modern laboratories – Laser Spectroscopy Laboratory and Laboratory of Fiber-Optic Photonics, both equipped with a number of measurement systems dedicated to versatile characterization of materials, elements and components for applications in photonics, and optical communication systems. In particular, the disposed apparatus comprises setups for optical absorption and emission characterization, as well as certain stands for investigating amplification and lasing parameters. The new and presently developed Fiber-Optic Photonics Laboratory is equipped with optical spectrum analyzers, signal analyzers, 40 GHz sampling oscilloscope, OTDR, tuneable lasers, WDM sources, power meters, optical attenuators and switches, setups for chromatic and polarization mode dispersion measurements etc. All of these systems are located in a controlled, clean room environment, guaranteeing highest level of measurement accuracy and repeatability as well.
Institute of Microelectronics and Optoelectronics (IMiO) comprises 8 tenured professors, 7 professors, 41 assistant professors and ca. 35 PhD students. The institute performs educational, scientific and research activities covering a wide spectrum of relevant specialties – from characterization and research of novel photonic materials and devices, to image processing, to microelectronic integrated circuits. Over 50 major projects for both National Committee for Scientific Researchers and European Commission either have been successfully completed or are underway at the Institute. The selected international projects, realized within last 5 years, could be enumerated as follows:
1.projects oriented towards technology of silicon-based nanodevices – SINANO, PULLNANO, NANOSIL
2.projects focused on development of design techniques for nano-CMOS devices – CLEAN, IDESA
3.projects focused on development of silicon on insulator technologies – EUROSOI
4.projects developing competences in micro-optics – NEMO
The next 3 projects are presently in evaluation phase.

Research interests / Project ideas
Microstructured fibers for dispersion compensation

Fiber link dispersion appears to be the primary bottleneck, significantly limiting maximal speed of the fiber optic telecommunication system. A huge effort is invested continuously in evolution of effective and reliable methods for dispersion compensation. One of the most promising appraches is applying recently developed microstructured fibers. The very specific fiber geometry and periodicity allows e.g. designing precisely tailored dispersion characteristics.The project, being continuation of research conducted previously (by partners from Warsaw University of Technology, Wroclaw University of Technology, Maria Curie-Sklodowska University, Vrije Universitaet Brussel and Polish Telecom R&D Branch) aims at modeling, designing and manufacturing of microstructured fibers (MSF) dedicated to dispersion compensation of telecommunication fiber links, as well as verification of its applicability in real fiber networks. It is assumed that proposed project will be realized in cooperation with partners, specified above, which combine scientific potential and technological expertise indispensable to design and manufacture customized microstructured fibers.

Optical amplifiers for applications in FTTx networks

Increasing complexity and requirements for radical increment of information capacity of fiber-optic telecommunication access systems (specifically FTTH) unavoidably necessitate the use of devices for amplification and power compensation related to multiple divisions of signal. This requires designing and testing of new solutions for optical amplifiers dedicated to applications in FTTH networks which would feature predominantly low price, small size and low power consumption, but also degraded noise and amplification characteristics when compared to long haul amplifiers.
Proposed project assumes theoretical analysis of potential solutions and identification of directions for experimental work set for developing of entirely new class of amplifying elements for a wide spectrum of wavelengths. In specific, two main groups of amplifiers will be considered – both planar and fiber-optics rare-earth doped solid-state amplifiers and semiconductor amplifiers, which could, as is believed, potentially turn out the most economic solution for access systems.

Microstructured polymer fibers for applications in FTTx networks

Plastic optical fibers, which offer the great advantage of mechanical flexibility together with low cost of manufacturing and simplicity of installation, are continuously considered as an interesting alternative for typical silica based fibers in local area networks, particularly in FTTH systems. The only limiting factors for application of polymer fibers in various transmission systems are relatively high attenuation and high values of modal dispersion resulted from large diameters of typical POF cores. Both problems could be possibly limited by application of microstructured design of the fibers.
Proper design of fiber geometry and periodicity of its microstructure allows introduction of photonic band gaps which would result in favorable low-loss propagation conditions in POF structures with air core, and significantly lowered modal dispersion (or even single mode operation) in large core POFs. Ultimately, proposed solution should enable significant improvement of transmission parameters, than those achievable in presently available POF structures.
Project aims at proposing and designing microstructured POFs with improved modal dispersion and attenuation properties and analysis of their applicability in FTTx networks.

Potential partners:
The project could be realized by a consortium comprising at least three polish partners: Warsaw University (modeling), Warsaw University of Technology (characterization) and Institute of Electronic Materials Technology (fabrication technology).

Remote optical power supply to active elements in FTTx networks

The past two decades observed a dynamic development of a diverse range of fiber-optic systems – starting with long haul systems, through metropolitan networks to access and local networks. Particular interest over the past years has been focused on the idea of FTTH networks (Fiber-To-The-Home) which would integrate a wide range of services – including classic telephone transmission over the Internet, video-conferencing, video-on-demand, e-working systems and distributed sensor systems.
Initially, FTTH networks employed mainly passive elements, however requirements of large throughputs and reliability of whole system as well as deployment of new services necessitated implementation of active elements (i.e. switches, tuneable filters, tuneable couplers etc.), which demand supply of electrical power and this had not been considered at first when planning development of optical networks. Requirement of electrical power supply has always posed technical difficulties (additional copper wiring) and substantial increasing of costs, especially when new copper wiring is to be put along existing fiber-optic ducts.
A favourable solution to problem of power supply to active elements operating in optical networks (both FTTH and sensor networks) may be found in remote optical power supply. In brief the idea is based on delivering large optical power via fiber network where it is converted to electrical energy by a special photovoltaic element, which powers directly the active element of the network. What is important, the same network can at that same time realize the primary data transmission function. The only condition is sufficient spectral separation of data and power signals.

FTTH, polymer fibers, microstructured fibers, dispersion compensation, optical amplifiers, remote optical powering,