Wavelength-division multiplexing (WDM) techniques provide many advantages for building optical interconnect networks for massively parallel processing (MPP) systems. A design for a 1024-channel network for MPP systems based on the interconnection-cached network with vertical-cavity surface-emitting laser (VCSEL) arrays with one wavelength is described. We then show how a WDM version with four different wavelengths can increase the channel density. We also show how a WDM system can reduce the fan-in loss by a factor of 4. All the VCSEL’s in each array are of the same wavelength, while different arrays use different wavelengths. We describe our experimental WDM subsystem containing four VCSEL arrays, operating at wavelengths of 843, 950, 970, and 980 nm, and three different WDM filters for multiplexing–demultiplexing. We present the operational results of the subsystem at 1 Gbit/s per channel.
© 1998 Optical Society of America
(060.4250) Fiber optics and optical communications : Networks
(060.4510) Fiber optics and optical communications : Optical communications
(200.2610) Optics in computing : Free-space digital optics
(200.4650) Optics in computing : Optical interconnects
Mikihiro Kajita, Kenichi Kasahara, Tae Jin Kim, David T. Neilson, Ichiro Ogura, Ian Redmond, and Eugen Schenfeld, "Wavelength-division multiplexing free-space optical interconnect networks for massively parallel processing systems," Appl. Opt. 37, 3746-3755 (1998)