&lt;title&gt;WDM/TDM optical-packet-switched network for supercomputing&lt;/title&gt;

Hughes

et al. 2001

J. Lightwave Technol.

Abstract-We present experimental and numerical studies of a novel packet-switch architecture, the data vortex, designed for large-scale photonic interconnections. The selfrouting multihop packet switch efficiently scales to large port counts ( 10 k) while maintaining low latencies, a narrow latency distribution, and high throughput. To facilitate optical implementation, the data-vortex architecture employs a novel hierarchical topology, traffic control, and synchronous timing that act to reduce the necessary routing logic operations and buffering. As a result of this architecture, all routing decisions for the data packets are based on a single logic operation at each node. The routing is further simplified by the employment of wavelength division multiplexing (WDM)-encoded header bits, which enable packet-header processing by simple wavelength filtering. The packet payload remains in the optical domain as it propagates through the data-vortex switch fabric, exploiting the transparency and high bandwidths achievable in fiber optic transmission. In this paper, we discuss numerical simulations of the data-vortex performance and report results from an experimental investigation of multihop WDM packet routing in a recirculating test bed.Index Terms-Optical networks, optical packet switch, wavelength division multiplexing (WDM) optical packet routing.

Section: Experimental Test Bedmentioning

confidence: 99%

WDM packet routing for high-capacity data networks

Hughes

et al. 2001

J. Lightwave Technol.

“…4), that emulates routings under cascaded node hops [3], [4]. In this experiment, another node (labeled node 1 in Fig.…”

Section: Experiments and Resultsmentioning

confidence: 99%

Traffic control and WDM routing in the Data Vortex packet switch

IEEE Photon. Technol. Lett.

2002

Abstract-A traffic control mechanism that eliminates the need for optical buffering and simplifies the routing procedure is experimentally demonstrated within the Data Vortex packet switch. The hierarchical switching system also employs a wavelength-divisionmultiplexing header-encoding technique to minimize the header processing and routing latency at each hop.Index Terms-Photonic packet switching, wavelength encoding.

“…The switch fabric size is characterized by two parameters and , representing the number of nodes along the angle and height dimensions, respectively. is typically set to be a small odd number ( 10), and is independent of the choice of . The available number of input/output (I/O) ports is given by .…”

Section: Architecture Overviewmentioning

confidence: 99%

“…Using DWDM within the data payloads further enhances high data throughput. In previous work, we have investigated the basic routing functionality, control signaling mechanism, and wavelength routing technique within an experimental test bed [9], [10]. In addition, our simulation results have shown that the Data Vortex packet switch achieves high scalability, low latency, and narrow latency distribution under uniform and random traffic conditions [11].…”

Section: Introductionmentioning

confidence: 98%

Performances of the Data Vortex switch architecture under nonuniform and bursty traffic

2002

J. Lightwave Technol.

The Data Vortex switch architecture has been proposed as a scalable low-latency interconnection fabric for optical packet switches. This self-routed hierarchical architecture employs synchronous timing and distributed traffic-control signaling to eliminate optical buffering and to reduce the required routing logic, greatly facilitating a photonic implementation. In previous work, we have shown the efficient scalability of the architecture under uniform and random traffic conditions while maintaining high throughput and low-latency performance. This paper reports on the performance of the Data Vortex architecture under nonuniform and bursty traffic conditions. The results show that the switch architecture performs well under modest nonuniform traffic, but an excessive degree of nonuniformity will severely limit the scalability. As long as a modest degree of asymmetry between the number of input and output ports is provided, the Data Vortex switch is shown to handle very bursty traffic with little performance degradation.