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Wavelength-division multiplexing free-space optical interconnect networks for massively parallel processing systems.

M Kajita1, K Kasahara, T J Kim

  • 1NEC Research Corporation, 34 Miyukigaoka, Tsukuba, Ibaraki 305, Japan.

Applied Optics
|February 15, 2008
PubMed
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This study demonstrates wavelength-division multiplexing (WDM) for optical interconnects in massively parallel processing (MPP) systems. WDM increases channel density and reduces loss using vertical-cavity surface-emitting laser (VCSEL) arrays.

Area of Science:

  • Optical Engineering
  • Computer Architecture
  • Telecommunications

Background:

  • Massively parallel processing (MPP) systems require high-bandwidth optical interconnects.
  • Existing single-wavelength networks face limitations in channel density and signal loss.

Purpose of the Study:

  • To design and experimentally validate a wavelength-division multiplexing (WDM) based optical interconnect for MPP systems.
  • To demonstrate the benefits of WDM in increasing channel density and reducing fan-in loss.

Main Methods:

  • A 1024-channel network design utilizing vertical-cavity surface-emitting laser (VCSEL) arrays.
  • Implementation of a WDM subsystem with four VCSEL arrays at distinct wavelengths (843, 950, 970, 980 nm).
  • Utilized three WDM filters for multiplexing and demultiplexing optical signals.

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Main Results:

  • Achieved increased channel density by employing four different wavelengths.
  • Demonstrated a reduction in fan-in loss by a factor of 4 compared to single-wavelength systems.
  • Successfully operated the WDM subsystem at 1 Gbit/s per channel.

Conclusions:

  • WDM techniques significantly enhance optical interconnects for MPP systems.
  • The proposed WDM design using VCSEL arrays offers a scalable and efficient solution for high-performance computing.
  • Experimental validation confirms the practical advantages of WDM for optical networks.