DocumentCode :
1764955
Title :
Integrated OTN/WDM switching architecture equipped with the minimum number of OTN switches
Author :
Eramo, V. ; Listanti, M. ; Sabella, R. ; Testa, F.
Author_Institution :
Dept. of Electron. & Telecommun. Eng., Sapienza Univ. di Roma, Rome, Italy
Volume :
6
Issue :
2
fYear :
2014
fDate :
Feb. 2014
Firstpage :
138
Lastpage :
151
Abstract :
In packet-optical integrated transport nodes for metropolitan networks, the wavelength data rate of the transponders has increased quickly to 10, 40, and 100 Gbps to reduce the cost of the transported bit. Meanwhile, the majority of the client data rate in routers and packet switches are still operating at 1, 2.5, and 10 Gbps. In this scenario, the introduction of optical transport network (OTN) switching technology enables an efficient wavelength bandwidth utilization and reduces the number of wavelengths, leading to reduced network costs. It has been shown that the use of integrated OTN/WDM switch architecture is cost effective because it reduces the number of short-reach client interfaces. The OTN/WDM also reduces the rack space and the power consumption compared to an architecture that uses a reconfigurable optical add-drop multiplexer and a separate standalone OTN switch or one that uses back-to-back muxponder connections to perform manual grooming. We introduce and investigate the performance of a new integrated OTN/WDN switching architecture in which the number of OTN switches is minimized. We propose an analytical model for the evaluation of the switch-blocking probability when two different OTN switch assignment policies are used. We show how the number of OTN switches can be reduced if a suitable dimensioning procedure is performed and depending on the traffic percentage needing OTN switching. As an example, if traffic is less than 45%, then the new proposed OTN/WDM switching architecture allows for 25% savings in OTN switching resources in the case of a switch with 4 input/output lines, 48 wavelengths, and 12 × 12 OTN switches.
Keywords :
bandwidth allocation; computer network performance evaluation; metropolitan area networks; optical fibre networks; optical switches; probability; transponders; wavelength assignment; wavelength division multiplexing; OTN switch assignment policies; OTN switches; back-to-back muxponder connections; client data rate; input-output lines; integrated OTN-WDM switching architecture; manual grooming; metropolitan networks; network cost reduction; optical transport network switching technology; packet-optical integrated transport nodes; power consumption reduction; rack space reduction; reconfigurable optical add-drop multiplexer; short-reach client interface number reduction; switch-blocking probability evaluation; transponders; wavelength bandwidth utilization; wavelength data rate; wavelength number reduction; Fabrics; Optical fiber networks; Optical fibers; Optical packet switching; Optical switches; Wavelength division multiplexing; Digital ROADM; OTN switching; Performance evaluation;
fLanguage :
English
Journal_Title :
Optical Communications and Networking, IEEE/OSA Journal of
Publisher :
ieee
ISSN :
1943-0620
Type :
jour
DOI :
10.1364/JOCN.6.000138
Filename :
6739399
Link To Document :
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