Abstract
Given a set of lightpath connection requests in an all-10 Gb/s optical dense wavelength division multiplexed (DWDM) Ethernet network, lightpaths are designed. In addition the wavelength channels are assigned subject to minimization of the channel blocking and provisional requests satisfying the limits due to accumulative linear dispersion effects over the hops. This paper proposes a routing and wavelength assignment scheme for DWDM long-haul optical networks that includes routing, assignment and reservation of different wavelength channels operating under the Generalized Multiprotocol Label Switching (GMPLS) environment. The GMPLS framework can offer an approach to implement IP over DWDM with variable weighting assignments of routes based on the limitations due to residual dispersion accumulated on the lightwave path. The modeling is implemented under the framework of an object-oriented modeling platform OMNeT++. Network performance tests are evaluated based mainly on a long-haul terrestrial fiber mesh network composed of as well as three topologies structured as chain, ring, and mesh configurations. Blocking probability of lightpath connection requests are examined with the average link utilization in the network employing variable number of wavelength channels in association with the limits of route distance due to linear chromatic and polarization mode dispersion effects.
Highlights
Since the invention of optical amplifiers in late 1980s advances in dense wavelength division multiplexing (DWDM) technology has enabled the implementation of multi-Tera/bits/sec. capacity in intelligent optical networks (ION) [1]
One of our goals is to estimate the performances of different routing and wavelength assignment (RWA) algorithms by simulations under without and with residual dispersion effects
Under the condition that the wavelength conversion is not used, the wavelength continuity constraint would lead to a high level of blocking when the load increases when no dispersion constraints are imposed
Summary
Since the invention of optical amplifiers in late 1980s advances in dense wavelength division multiplexing (DWDM) technology has enabled the implementation of multi-Tera/bits/sec. capacity in intelligent optical networks (ION) [1]. Since the invention of optical amplifiers in late 1980s advances in dense wavelength division multiplexing (DWDM) technology has enabled the implementation of multi-Tera/bits/sec. Systems and networks need to be interconnected in the optical wavelength domain or layer via optical routers and photonic switches and managed under appropriate protocols. At 10 Gb/s and possibly higher with the possibility of upgrading certain number of channels to 40 Gb/s or even 100 Gb/s, the detrimental effects of linear dispersion effects such as the chromatic dispersion (CD) and polarization mode dispersion (PMD) and are critical for error free transmission and interconnect between the IP routers. The number of wavelength channels are high with the average total power may be over the nonlinear threshold for the transmission lightpaths that would lead to the reduction of the eye opening of the receiver signals. We must note that these effects are not very critical for 2.5 Gb/s transmission bit rate which is commonly used in
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