Crosstalk-free conjugate networks for optical multicast switching

A multi-wavelength copy interconnect is a switching network capable of replicating a signal arriving at the input on a specific wavelength to one or more outputs possibly on different wavelengths. Such an interconnect can be useful in building optical multicast switches for wavelength division multiplexing (WDM) networks. In this article, we investigate, for the first time, the problem of designing copy networks that can simultaneously multicast input signals to a set of outputs while changing the wavelength of the replica according to the required routing pattern. We propose a novel multi-wavelength crossbar (MWX) switch that can switch an input signal on a specific wavelength to two different output wavelengths. The proposed MWX is used as a building block to construct two classes of multi-log 2N copy networks, namely, baseline and Beneš interconnects. The design space of the proposed interconnect classes is characterized and their hardware complexity is analyzed. We show that the proposed interconnects are transparent to existing multicast routing algorithms, and present simple routing algorithms for routing of multicast requests over the proposed designs. Comparisons with existing designs confirm that the proposed interconnects require a smaller number of space switches and wavelength conversion processes as compared to most conventional copy networks. In particular, for a large number of wavelengths and for any number of fibers the proposed design requires 50% less switching elements as compared to best available designs.

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A scalable optical WDM multicast Beneš network with multi-channel wavelength converters

Hamza

2010

Photon Netw Commun

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An optical wavelength division multiplexing (WDM) multicast network interconnects an input signal on a given wavelength to one or more output fibers, possibly on different wavelengths (via wavelength conversion), while maintaining the signal in the optical domain. A key challenge in the design of scalable multicast networks is to reduce conversion complexity without affecting the switching capability and signal quality. In this article, we propose a scalable WDM multicast Beneš interconnection network with minimized conversion complexity. The proposed network is based on the Copy-and-Route architecture, and it uses multichannel WCs (MCWCs) for wavelength conversion. The conversion complexity of the proposed design is O(F log 2 W ) (where F is the number of fibers and W is the number of wavelengths per fiber), which is smaller than the O(F W ) complexity of the optimal design based on conventional single-channel WCs (SCWCs). We prove that, for W > 64 and for any value of F, the conversion complexity of the new design is strictly less than that of the optimal SCWCbased design regardless of the total number of wavelengths simultaneously converted by each MCWCs. Analyzes of conversion complexity of the proposed design for large values of W confirm considerable savings compared to the optimal SCWC-based design. For instance, for W = 256 and an for an arbitrary value of F, a practical implementation of the proposed design achieves 87% reduction in conversion complexity as compared to the optimal SCWC-based design.

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Crosstalk-free conjugate networks for optical multicast switching

Cited by 14 publications

References 32 publications

cPSIR: Circuit-Based Private Stateful Information Retrieval for Private Media Consumption

cPSIR: Circuit-Based Private Stateful Information Retrieval for Private Media Consumption

On the design of multi-wavelength copy interconnects with reduced complexity

A scalable optical WDM multicast Beneš network with multi-channel wavelength converters

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