In this paper Free Space Optics (FSO) in combination with other wireless technologies (including WLAN and satellite communications in civil-military-cooperation (CIMIC)) is presented. At first modular communication systems are shown, which allows worldwide access to the Internet or other networks by combining satellite communications, FSO, Wireless LAN, Local Multipoint Distribution System (LMDS) and DVB-T (terrestrial digital video broadcast). Wireless LAN offers connectivity to mobile users in a network cell, Free Space Optics allows quick installation of broadband fixed wireless links instead of cables and satellite communications provides a backbone between distant locations in the world. DVB-T is the current video broadcast standard (instead of former analogue TV) and will also be used for Internet-access (see project SEE TV-WEB). Different scenarios (and results) using modular wireless technologies are shown. Free Space Optics and wireless applications (including satellite) installed at a civil-militaryexercise in Styria (southern part of Austria) and other application scenarios are presented. In this civil-military cooperation a mobile satellite earth station (equipped with FSO and Wireless LAN) was used for videoconferencing between military and civil organizations. Applications with DVB-T will supplement a few scenarios in combining wireless technologies with FSO.
In the last couple of years the need for higher data rates and more bandwidth has arisen. This development will continue in the next couple of decades and allegorizes a challenge for the future Next Generation Networks. Taking this into account the end-user will need higher data rates, getting theoretical access to the full available bandwidth of the backbone delivered to the home.Free Space Optics (FSO) is an excellent supplement to conventional radio links and fiber optics, capable of handling point-to-point and point-to-multipoint connections. On the one hand-side FSO is a broadband wireless solution for the "Last Mile" connectivity in metropolitan networks, on the other hand-side FSO can be used to interlink locations within one local area network. In the last years different types of cost-effective systems were developed and realized at the Institute of Broadband Communication of Graz University of Technology (TU Graz). The first type was based on a modular concept using available standard components allowing demonstrations at a data rate of 2 × 10 Mbit/s for short distances up to 300 m at a specific power margin of 25 dB/km. Later the units were improved to allow a data rate of 100 Mbit/s, higher data rates are currently under development.The reliability and availability of a FSO-link is mainly determined by the local atmospheric conditions, in free space the transmitted light is reflected, refracted or absorbed by objects, rain, fog, wind or sun. All these parameters directly influence the quality of a FSO-link and indirectly affect the quality of an Access Network.Many FSO-installations (permanent and nomadic use) have been set-up in the area of Styria by TU Graz and cooperation partners. In this contribution we will show some practical installations for different events, including the latest permanent installation, which was started in the summer of 2007 together with the municipality of Dobl, a small suburb of Graz, and the ML11 GmbH, an IT-company. Within this cooperation the elementary school of Dobl was connected to the Internet via FSO. The FSO-units were successfully installed and the setup is now used to explore the influence of weather on the FSO-link in the area of Graz. INTRODUCTIONToday, many people need high data rates for Internet or network access. Therefore Free Space Optics (FSO) is a well suited technology. The high bandwidth of the "Backbone" (fiber network) is also available for the enduser. The research group for Optical Communication ("OptiKom") at the Institute of Broadband Communication, TU Graz, has done research in the field of Free Space Optics (FSO) over a period of near 15 years. The work includes the development of FSO-equipment for research purpose and the evaluation of commercially available FSO systems for the climate in Graz (Austria) in co-operation with industrial partners. The main projects in this field have been funded by Telekom Austria AG, InfraServ Gendorf and the Government of Styria. Additional experiments and investigations in this field were started within the...
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