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Optical Burst Switching
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Author(s): Joel J.P.C. Rodrigues (Instituto de Telecomunicações, University of Beira Interior, Portugal), Paulo P. Monteiro (Universidade de Beira Interior, Portugal)and Pascal Lorenz (SIEMENS S.A. and Universidade de Aveiro, Portugal)
Copyright: 2005
Pages: 8
Source title:
Encyclopedia of Multimedia Technology and Networking
Source Author(s)/Editor(s): Margherita Pagani (Bocconi University, Italy)
DOI: 10.4018/978-1-59140-561-0.ch113
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Abstract
The concept of burst switching was proposed initially in the context of voice communications by Haselton (1983) and Amstutz (1983; 1989) in the early 1980s. More recently, in the late 1990s, optical burst switching (OBS) was proposed as a new switching paradigm for the so-called optical Internet in order to overcome the technical limitations of optical packet switching; namely, the lack of optical random access memory (optical RAM) and to the problems with synchronization.(Yoo & Qiao, 1997; Qiao & Yoo, 1999; Chen, Qiao & Yu, 2004; Turner, 1999; Baldine, Rouskas, Perros & Stevenson, 2002; Xu, Perros & Rouskas, 2001). OBS is a technical compromise between wavelength routing and optical packet switching, since it does not require optical buffering or packet-level processing as in optical packet switching, and it is more efficient than circuit switching if the traffic volume does not require a full wavelength channel. According to Dolzer, Gauger, Späth, and Bodamer (2001), OBS has the following characteristics: • Granularity: The transmission unit size (burst) of OBS is between the optical circuit switching and optical packet switching. • Separation Between Control and Data: Control information (header) and data are transmitted on different wavelengths (or channels) with some time interval. • Allocation of Resources: Resources are allocated using mainly one-way reservation schemes. A source node does not need to wait for the acknowledge message from destination node to start transmitting the burst. • Variable Burst Length: The burst size is variable. • No Optical Buffering: Burst switching does not require optical buffering at the intermediate nodes (without any delay).
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