Tutorials

One Hour, Morning Session

Title: Challenges in the Wireless Sensor Communications Networks

Professor Vivek S Deshpande
Associate Professor
Department of Information Technology
MIT College of Engineering, Pune, India.
Phone: +91 9422519649(M)
Email: vsd.deshpande@gmail.com

Abstract: Now-a-days Wireless Sensor Networks plays predominant role in the communication domain. The data to be disseminated from multiple sources to the destination base station or sink is having vital significance. There are many problems with which data can be conveyed up to the sink. The congestion, reliability, delay, fairness, etc. are of main concern. These can be treated as Quality of Service parameters that govern the performance of the WSN. Above all the Energy s consumption is the main constrain for WSN node. It is very difficult to obtain good QoS by keeping energy consumption low. Even if response of one of QoS parameter will depends on the many other QoS parameters. We have to take care of all QoS parameters to improve the performance of the wireless sensor networks. This Quality of Services may improve the application base of the WSN. With the QoS parameters the data dissemination along with energy optimization is get affected. We have to check the performance of the WSN against the QoS metrics for different data inputs. This may contain the periodic- non periodic data, event based data, transient or bursty data. For all these different types of inputs data we are checking the performance of QoS parameters like congestion, reliability and fairness. This may lead to new researcher to verify their results and excel their research work accordingly.

Biography: Mr Vivek S. Deshpande, Dean, Research & Development, MIT College of Engineering, holds Bachelors and Masters of Engineering in Electronics and Telecommunications from Pune University. Currently he is doing a research in Wireless Sensor Networks, embedded systems and High Performance Computer Networks.

Specific topics of interest and Research: Wireless sensor networks, Body area networks, Quality of Service, Algorithm/Protocol development, Mobile Communications and mobility in WSN, Wireless Communications and networking in WSN, Information and Communications technologies in WSN, Simulation, Modeling and analysis and performance evaluations, Network management and services, Health care and home networking, Reviews and Applications: Social, health, sports, environmental, etc.

The Rs.15 lacks of funded project “Highway Traffic Monitoring Systems (HTMS)” phase-I is done under his guidance. He guided the 10 person’s team of technical researchers. The innovation of palm tops based on Android ported on ARM is having great success of research project. Many industries achieve huge success in their research and development with the kind help of his technical consultancy.

His 18 years of teaching and industrial experience is an asset to the organization. He is working as Associate Professor in Department of Information Technology, His expertise in the field of Wireless computer Networks and Distributed system helps in guidance to the PG students.


Title: Optical Network Systems and Devices


Professor Dr. Alok Kumar Das

Electronics & Communication Engineering Deptt.
Jadavpur University, Kolkata-700 032, India
Phone +91 33 2436 3733 (R), +91 9432211162 (M)
Email: alok_kumar_das@yahoo.com

Abstract: To accommodate the skyrocketing demand of users and their requirements of Bandwidth, optical fibers/ waveguides network with wavelength division multiplexing (WDM) having several wavelengths per fiber as channels, is the most feasible solution. Transmission rate of a channel with 2.4, 10 or 40 Gbps is indeed achievable only in the electrical domain. With the advent of optical amplifiers in the mid 1990s and later on the feasibility of various types of optical switches, have enabled to consider the development of a new generation of optical networks in which optical signal with a given light path is routed without O-E-O (optical to electrical and electrical to optical) conversion and thus reduces the deployment time and produces additional network robustness. It has the advantage of eliminating the intermediate layer such as such as ATM and SONET/SDH. In a larger networks having more number of nodes, more wavelengths are needed and to avoid the large number of wavelengths the wavelength-routed networks overcome these limitations through wavelength reuse, wavelength conversion, and optical switching. The OXC (Optical Cross Connect), optical circuit switches (OCS), optical packet switches (OPS), and optical burst switches (OBS) techniques are considered where OXC produces the switching fabric for long term traffic demands. The OCS, OPS and OBS techniques require a light path to reconfigure automatically the switching fabric. Optical level switching (OLS) offers interoperability between OPS, OBS, and OCS and demonstrates successfully in Global optical network for multi-service applications. IP (Internet Protocol) backbone carriers are now connecting core routers directly over point-to-point WDM links (IP over WDM). This layer structure with a help of GMPLS (Generalized Multi Protocol Level Switching) and OXC (Optical Cross Connect) with IP packets are directly mapped into wavelength channels. The technologies for core networks (intercity), metro networks for MANs (intra-city), and local access networks for the services to the home or business, need rapid provisioning of connections within each subnet. The numerous investigations have been carried out to solve routing and wavelength -assignments (RWA) problem in this DWDM networks considering the static light path system applying OXC-based networks and the dynamic light path system applied to OCS, OPS and OBS-based networks.

The objective of the tutorial is to provide firstly the basic idea of optical fiber communication systems considering different optical sources, optical fibers/ waveguides, optical detectors, and secondly the various investigations of optical transparency, mainly on optimization techniques related to RWA problem. The variation of quality of transmission (QoT) depending on RWA problem and hence for better network planning or better traffic engineering, will also be discussed. We consider the design of a network under long term traffic demands as OXC-based networks where as the dynamic traffic demands in OCS, OPS or OBS-based networks. Traffic statistic and optical burst overlap reduction in core routers of OBS networks will be discussed. In the next step, we describe the various devices for different components (Transponders, WDM multiplexers/de-multiplexers, amplifiers, optical fibers) to be required in a typical optical transmission system. Now-a-day there is a need to develop efficient optical components and devices relevant to the different optical networks with better (QoT). We shall discuss the router and routing techniques and different switches and their implementations. The different implementation methods of the switches are mechanical, MEMS, liquid crystals, bubble, waveguide type TO (Thermo-optic) and EO (Electro-optic) switches, wavelength routing switch (AWG and tunable λ), etc. These optical switches are very efficient and depending on size, capacity, speed, scalability, and cost one technology may prove superior to another, at least for specific needs. The advantages and disadvantages of electrical, Opto-electronics and optical switches and in-depth understanding for their requirements considering the limitation of the bandwidth between the links in different network systems will be discussed. The other waveguide type devices like modulators, attenuators, add/drop filters, couplers, power dividers and combiners, TE and TM mode splitters etc., required for optical networks, will be discussed considering their low losses and compact sizes. Now-a-day polymeric optical waveguide devices have attracted great interest in the field of integrated optics as it offers many advantages compared with other available waveguide materials because of their potential for easy, low-temperature and low-cost processing, highly tunable material index with large Thermo-optic coefficient. It also offers EO property with large Electro-optic coefficient. It possesses high nonlinear optical property for high speed and wide-band signal processing. The demand for low priced polymeric optical fibers/waveguides (POF)/(POW) is increasing due to their many short distance applications (10Gbps transmission over 100 meters) including fibers/waveguides in home. The fabrication of POF/POW with their propagation characteristics will also be covered. Lastly, we shall discuss the networking of 21st century.

Biography: Professor Dr. Alok Kumar Das graduated in 1965 from Jadavpur University, Kolkata, India in Electronics and Telecommunication Engineering. He completed his Master and PhD degrees in Engineering from the same University in 1967 and 1972, respectively. He was a senior Professor in the Department and now he is a senior professor in Gargi Memorial Institute of Technology (GMIT), Kolkata, India. Dr. Das is a senior member of IEEE and is the winner of the prestigious IEEE 2000 Millennium award. His research interest is in the field of Optical fiber communication systems including integrated optics and optical networks. He has directed several sponsored projects in the area of optical fiber components, optical networks, and optical instruments. Dr. Das is directly involved in the development of optical waveguiding devices like interconnects, modulators, switches, and attenuators. He was a Visiting Professor in the City University of Hong Kong almost every year from 1999 to 2005 to fabricate optical switches and also in Chung-Ang University, Seoul, Korea, in 2006, for the development of optical devices, to be required in optical network applications. Currently he is involved to fabricate Thermo-optic polymeric optical devices. Dr. Das has given several invited talks in US, Canada, Japan, Germany, China, S. Korea and editor of several journals including IEEE. Dr. Das published about 148 papers in refereed journals and conference proceedings including IEEE, Applied Optics, Optics Lett. Electronics Lett. He has been a consultant to industry, telecommunications operators, and government agencies in India, Singapore and Hong Kong.