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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 4 — Feb. 13, 2012
  • pp: 4331–4345

3-D integrated heterogeneous intra-chip free-space optical interconnect

Berkehan Ciftcioglu, Rebecca Berman, Shang Wang, Jianyun Hu, Ioannis Savidis, Manish Jain, Duncan Moore, Michael Huang, Eby G. Friedman, Gary Wicks, and Hui Wu  »View Author Affiliations


Optics Express, Vol. 20, Issue 4, pp. 4331-4345 (2012)
http://dx.doi.org/10.1364/OE.20.004331


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Abstract

This paper presents the first chip-scale demonstration of an intra-chip free-space optical interconnect (FSOI) we recently proposed. This interconnect system provides point-to-point free-space optical links between any two communication nodes, and hence constructs an all-to-all intra-chip communication fabric, which can be extended for inter-chip communications as well. Unlike electrical and other waveguide-based optical interconnects, FSOI exhibits low latency, high energy efficiency, and large bandwidth density, and hence can significantly improve the performance of future many-core chips. In this paper, we evaluate the performance of the proposed FSOI interconnect, and compare it to a waveguide-based optical interconnect with wavelength division multiplexing (WDM). It shows that the FSOI system can achieve significantly lower loss and higher energy efficiency than the WDM system, even with optimistic assumptions for the latter. A 1×1-cm2 chip prototype is fabricated on a germanium substrate with integrated photodetectors. Commercial 850-nm GaAs vertical-cavity-surface-emitting-lasers (VCSELs) and fabricated fused silica microlenses are 3-D integrated on top of the substrate. At 1.4-cm distance, the measured optical transmission loss is 5 dB, the crosstalk is less than −20 dB, and the electrical-to-electrical bandwidth is 3.3 GHz. The latter is mainly limited by the 5-GHz VCSEL.

© 2012 OSA

OCIS Codes
(130.3120) Integrated optics : Integrated optics devices
(220.0220) Optical design and fabrication : Optical design and fabrication
(250.5300) Optoelectronics : Photonic integrated circuits
(200.2605) Optics in computing : Free-space optical communication

ToC Category:
Integrated Optics

History
Original Manuscript: December 8, 2011
Revised Manuscript: January 29, 2012
Manuscript Accepted: January 30, 2012
Published: February 7, 2012

Citation
Berkehan Ciftcioglu, Rebecca Berman, Shang Wang, Jianyun Hu, Ioannis Savidis, Manish Jain, Duncan Moore, Michael Huang, Eby G. Friedman, Gary Wicks, and Hui Wu, "3-D integrated heterogeneous intra-chip free-space optical interconnect," Opt. Express 20, 4331-4345 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-4-4331


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