Minimum lens complexity design approach for a free-space macro-optical multichip global interconnection module

Predrag Milojkovic; Marc P. Christensen; Michael W. Haney

doi:10.1117/12.386785

24 May 2000 Minimum lens complexity design approach for a free-space macro-optical multichip global interconnection module

Predrag Milojkovic, Marc P. Christensen, Michael W. Haney

Author Affiliations +

Proceedings Volume 4089, Optics in Computing 2000; (2000) https://doi.org/10.1117/12.386785
Event: 2000 International Topical Meeting on Optics in Computing (OC2000), 2000, Quebec City, Canada

Abstract

The FAST-Net (Free-space Accelerator for Switching Terabit Networks) concept uses an array of wide field-of-view imaging lenses to realize a high-density shuffle interconnect across an array of smart-pixel integrated circuits. This paper presents a design approach for these lenses that achieves the minimum complexity required to meet the demands of the FAST-Net concept's off-axis multi-chip environment. Generalized eikonals for arbitrary surfaces were examined to determine the performance bounds for the FAST-Net optical system. Then an analysis provided an estimate of 6 for the number of spherical surfaces needed to achieve good optical resolution and distortion performance across an array of 10-micron diameter VCSEL sources that are imaged onto a array of 50-micron wide detectors. A ray trace simulation confirmed this number. Subsequent analysis evaluated the achievable efficient of replacing spherical surfaces with aspherical ones. By exploiting the mismatch between the low numerical aperture VCSELs and relatively higher numerical aperture interconnection optics, it was found that 3 aspherical surfaces could replace 6 spherical surfaces in the FAST-Net system for the specified performance criteria. A lens design that utilizes 3 aspherical surfaces and achieves necessary registration and resolution of the FAST-Net system was determined. The results provide a general framework for the design of wide field-of-view free space interconnection systems that incorporate high-density VCSEL arrays.

Citation Download Citation

Predrag Milojkovic, Marc P. Christensen, and Michael W. Haney "Minimum lens complexity design approach for a free-space macro-optical multichip global interconnection module", Proc. SPIE 4089, Optics in Computing 2000, (24 May 2000); https://doi.org/10.1117/12.386785

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