Architectures for WDM Benes interconnection network with simultaneous space-wavelength switching capability
ABSTRACT In this paper, we present three switch architectures for WDM (Wavelength Division Multiplexing) Benes network that are based on wavelength exchange optical crossbar (WOC). A WOC is capable of performing a single-step space-switching wavelength-conversion between two wavelengths. A WOC can be implemented by the simultaneous power exchange between two optical signals. Unlike existing designs, the proposed architectures do not require separate stages of wavelength converters. This leads to a switch design that has a smaller total number of components as well as a smaller number of components in the signal path. Moreover, wavelength conversion is performed between two predefined and fixed wavelengths. This avoids the need for expensive full-range wavelength converters used in most of the existing designs. Systematic methods to realize switch architectures with an arbitrary number of wavelengths and fibers are given. The three architectures are evaluated and compared to existing architectures on the basis of hardware cost.
- SourceAvailable from: ucdavis.edu[show abstract] [hide abstract]
ABSTRACT: This paper proposes an architecture for a wavelength-interchanging cross-connect (WIXC) that can be used as a switching node of strictly transparent and scalable networks with all-optical routing and all-optical wavelength conversion capabilities. This architecture utilizes all-optical parametric wavelength converters based on difference-frequency-generation (DFG) or four-wave mixing (FWM), although this work focuses only on the implementation using difference-frequency-generation wavelength converters. The proposed WIXC architecture exploits the unique wavelength mapping properties of parametric wavelength converters: mirror image mapping and simultaneous multichannel wavelength conversion. The derivation of this architecture involves application of a space/wavelength transformation to the classical Benes switch fabric. The connection setup for the resulting architecture follows the well established looping algorithm, and the architecture is scalable in both the ports and the wavelengths. The scaling occurs in an orderly fashion, which allows modular upgrades of WIXC's for cost-effective evolution of the networks. The unique properties of the parametric wavelength converter including transparent and multichannel conversion capabilities result in a WIXC architecture that requires fewer wavelength converters while maintaining scalability and transparencyJournal of Lightwave Technology 08/1999; · 2.56 Impact Factor
- [show abstract] [hide abstract]
ABSTRACT: We demonstrate a simple scheme to achieve fast tunable wavelength conversion over a wide spectral range. The wavelength conversion is obtained by four-wave mixing in a semiconductor optical amplifier using a double-pump scheme, 2048-bit sequences at 2.5 Gb/s, incoming at a given wavelength, are alternatively converted toward two different wavelengths for a total conversion interval of 20 nm. With this method, the time needed to change the destination wavelength is much shorter than the bit duration. This feature makes any guard-time spacing between packets unnecessary. Bit-error-rate measurements show that the process occurs with negligible penalties (less than 0.3 dB).IEEE Photonics Technology Letters 11/2000; · 2.04 Impact Factor
Conference Proceeding: An evaluation of optical switch architectures utilizing wavelength converters[show abstract] [hide abstract]
ABSTRACT: Due to the current costs of the optical network components, ways are being sought to maximize the benefits of optical networks while minimizing costs. Wavelength conversion has been studied as a way to improve efficiency in all-optical networks. A network utilizing wavelength conversion can minimize the number of wavelengths it employs, reducing the complexity and cost. This paper looks briefly at the five known switch architectures employing converters: dedicated, share-per-node, share-per-link, share-with-local and electronic wavelength-convertible switches. A novel compromise between cost and performance with the half-clear wavelength-convertible switch is proposed. This switch is shown to have performance characteristics similar to the dedicated wavelength-convertible switch, with a cost closer to opto-electronic techniquesElectrical and Computer Engineering, 2000 Canadian Conference on; 02/2000