Wavelength reservation scheme with switch fabric status in distributed mesh optical networks

A new wavelength reservation scheme is proposed to mitigate the connection setup time and minimize the reconfiguration times of optical cross-connects (OXCs) for WDM optical networks in this study. In this scheme, we consider the reconfiguration information of switch fabrics in the signaling protocol, which is designated as the signaling with switch fabric status (SWFS). Distributed reservation algorithms will reserve the wavelength with minimum of reconfiguration times of OXCs along the route. Simulation results indicate that the proposed schemes with switch fabrics status have shorter setup time, lower switching ratio as well as better blocking performance than those of the traditional classic schemes. Moreover, the proposed schemes with SWFS significantly reduce the number of switch fabrics that need to be reconfigured. Foundation item: the National Natural Science Foundation of China (Nos. 60632010 and 60572029) and the National High Technology Research and Development Program (863) of China (No. 2006AA01Z251)     

Load Balancing in WDM Optical Networks with and without Wavelength—Continuity Constraints

In practical optical networks, there is often the same number of wavelengths in a fiber. But if it is not carefully designed, there will be much difference in link load among different fibers, and unnecessary wavelengths will be needed. This paper investigated this load balancing issues to minimize the wavelength requirements. Both Integer Linear Programming (ILP) and heuristic algorithms were presented to solve such a problem in WDM optical networks with or without wavelength-continuity constraints.     

DESIGN ISSUES FOR BIT RATE-ADAPTIVE 3R O/E/O TRANSPONDER IN INTELLIGENT OPTICAL NETWORKS

IntroductionWith the rapid progress of Optical Add- DropMultiplexer and Optical Cross- Connect( OADM/OXC) technologies,itis becoming possible for car-riers to provide high- speed services such as OC- 48/OC- 1 92 and Gigabit Ethernet transmission chan-nels directly from the optical domain. Line speedsof electrical layer devices such as IP routers andATM switches are continually growing to satisfythe increasing demands of data,as evidenced bythe introduction of line card speeds of OC- …