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Proceedings Paper

Derivation and examination of a comprehensive free-space optical interconnect link equation
Author(s): Novak S. Petrovic; Christopher J. O'Brien; Aleksandar D. Rakic
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Paper Abstract

Free-space optical interconnects (FSOIs) utilize arrays of vertical-cavity surface emitting lasers (VCSELs), microlenses, and photodetectors to effectively overcome the communication bottleneck caused by the poor performance of electrical interconnects. We derived a comprehensive FSOI link equation which can be used to determine the interconnect performance parameters, such as the receiver carrier-to-noise ratio. The link equation includes both optical and electrical noise components. The optical noise component is caused mainly by laser beam diffraction. We have simplified the modeling of optical noise by using the recently introduced Mode Expansion Method. The optical noise component strongly depends on the modal content of the incident VCSEL beam. The models used in the literature assume that the cross-sectional profile of the emitted laser beam resembles the fundamental Gaussian mode. Our link equation takes into account the modal structure of a multimode VCSEL beam. We have investigated the FSOI performance and we found that for each merit function there exists a single set of design parameters yielding the optimal performance. We have also found that the presence of higher-order modes negatively affects the performance. Our results show that FSOIs based on multimode VCSELs can be utilized in chip-level interconnects despite increased beam diffraction.

Paper Details

Date Published: 25 March 2004
PDF: 10 pages
Proc. SPIE 5277, Photonics: Design, Technology, and Packaging, (25 March 2004); doi: 10.1117/12.522862
Show Author Affiliations
Novak S. Petrovic, Univ. of Queensland (Australia)
Christopher J. O'Brien, Univ. of Queensland (Australia)
Aleksandar D. Rakic, Univ. of Queensland (Australia)

Published in SPIE Proceedings Vol. 5277:
Photonics: Design, Technology, and Packaging
Chennupati Jagadish; Kent D. Choquette; Benjamin J. Eggleton; Brett D. Nener; Keith A. Nugent, Editor(s)

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