Experimental demonstration of the optical multi-mesh hypercube: Scaleable interconnection network for multiprocessors and multicomputers

Ahmed Louri, Stephen Furlonge, Costas Neocleous

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


A prototype of a novel topology for scaleable optical interconnection networks called the optical multimesh hypercube (OMMH) is experimentally demonstrated to as high as a 150-Mbitys data rate (27 2 1 nonreturn-to-zero pseudo-random data pattern) at a bit error rate of 10213ylink by the use of commercially available devices. OMMH is a scaleable network [Appl. Opt. 33, 7558 (1994); J. Lightwave Technol. 12, 704 (1994)] architecture that combines the positive features of the hypercube (small diameter, connectivity, symmetry, simple routing, and fault tolerance) and the mesh (constant node degree and size scaleability). The optical implementation method is divided into two levels: high-density local connections for the hypercube modules, and high-bit-rate, low-density, long connections for the mesh links connecting the hypercube modules. Free-space imaging systems utilizing vertical-cavity surfaceemitting laser (VCSEL) arrays, lenslet arrays, space-invariant holographic techniques, and photodiode arrays are demonstrated for the local connections. Optobus fiber interconnects from Motorola are used for the long-distance connections. The OMMH was optimized to operate at the data rate of Motorola’s Optobus (10-bit-wide, VCSEL-based bidirectional data interconnects at 150 Mbitsys). Difficulties encountered included the varying fan-out efficiencies of the different orders of the hologram, misalignment sensitivity of the free-space links, low power (1 mW) of the individual VCSEL’s, and noise.

Original languageEnglish (US)
Pages (from-to)6909-6919
Number of pages11
JournalApplied optics
Issue number35
StatePublished - Dec 10 1996


  • Hypercube
  • Interconnection network
  • Mesh
  • Optical interconnects
  • Parallel computing
  • Scaleability
  • VCSEL’s

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering


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