Conference Paper
Architectures for WDM Benes Interconnection Network with Simultaneous SpaceWavelength Switching Capability
Dept. of Comput. Sci. & Eng., Univ. of NebraskaLincoln, USA
DOI: 10.1109/ICBN.2005.1589615
Conference: Broadband Networks, 2005. BroadNets 2005. 2nd International Conference on
Source: IEEE Xplore

Conference Paper: Design of Wavelength CrossConnects Based on Permutations among Fibers
[Show abstract] [Hide abstract]
ABSTRACT: A wavelength crossconnect (WXC) is an optical crossconnect with external stage of wavelength converters. It is a crucial element in a wavelength division multiplexing (WDM) network. A new type of WXC, namely wavelengthexchanging crossconnect (WEX), was recently proposed. Because WEX can simultaneously perform switching and wavelength converting, it has low hardware complexity. To achieve switching nonblocking, the designs of current WXCs (including WEXs) are based on fullpermutation switching, which provides any permutation of input signals at the output of the crossconnect. This may result in routing of various wavelengths originating from a fiber to a particular fiber; and they may also perform wavelength converting. Such permutations may not be necessary in a WDM network. We propose a novel concept to design WEXs, which is based on the permutations among output fibers, but not among output ports. This leads to the reduction of the number of permutations, as well as the complexity of WEXs. In designing such WEXs, we propose the following method: (i) using a permutation matrix to describe the operation of a 2×2 element in a WEX; and (ii) applying a permutation matrix product rule to simplify the architecture of the WEX.Photonics and Optoelectronics (SOPO), 2012 Symposium on; 01/2012 
[Show abstract] [Hide abstract]
ABSTRACT: Planar permutation networks are a class of multistage switching networks with no crossover between paths that interconnect switching elements. A wellknown class of planar networks is the N−Stage network that provides a good compromise between the crossbar and the Benes network. In this paper, we address the problem of designing costeffective NStage optical planar networks with spacewavelength switching capability. Such networks are used for switching in communication and computing systems that employ Wavelength Division Multiplexing (WDM) technology. We investigate two classes of spacewavelength Nstage planar networks, and for each class, we design a number of switching networks and analyze their hardware complexity. In addition, we propose a new method for designing a class of spacewavelength planar networks with reduced complexity. It is shown that, for F ≤ W (where F is the total number of fibers and W that of wavelengths) the proposed method results in planar networks with an average of 67% reduction in overall cost compared to that of networks based on fixedrange wavelength converters.Photonic Network Communication 05/2007; 13(3):297312. DOI:10.1007/s111070060045y · 0.75 Impact Factor 
[Show abstract] [Hide abstract]
ABSTRACT: In wavelength division multiplexing (WDM) networks, wavelength crossconnect (WXC) is an important device which consists of space switching elements (SSEs) and wavelength converters (WCs) to provide the switching functionality of connection between its inputs and outputs. Wavelengthexchange optical crossbar (WOC) is a novel photonic switching element which enables performing space switching and wavelength converting in a singlestep. By replacing some conventional 2�?2 space switching elements with WOCs, a new class of photonic switch architectures called wavelengthexchanging cross connect (WEX) has been proposed to eliminate all WCs used in all of the existing WXC designs. In order to achieve nonblocking connection, the photonic switch architectures are designed to provide connections of fullpermutation, which indicate that the outputs are all possible permutations of the inputs. We observe that some permutations, such as to mutually exchange the wavelengths within the same fiber, are equivalent and hence may not be necessary. Since the number of connection permutations of a photonic switch is proportional to its hardware complexity, the switch architecture with only sufficient permutations consequently has low complexity. We propose a design methodology to construct such new WDM photonic switches based on Benes WEX type with 2 fibers, by eliminating some switching elements whose control states are always in bar or cross for sufficient permutations. Our study results show that (i) in cases of Benes WEX switch with 2 wavelengths in each fiber, 2 out of 6 switching elements can be eliminated; (ii) in cases of Benes WEX switch with 4 wavelengths in each fiber, 4 out of 18 switching elements can be eliminated.
Data provided are for informational purposes only. Although carefully collected, accuracy cannot be guaranteed.
The impact factor represents a rough estimation of the journal's impact factor and does not reflect the actual
current impact factor.
Publisher conditions are provided by RoMEO. Differing provisions from the publisher's actual policy or licence
agreement may be applicable.