Space-Time-Coded High-Speed Reconfigurable Card-to-Card Free-Space Optical Interconnects

Ke Wang; Ampalavanapillai Nirmalathas; Christina Lim; Kamal Alameh; Efstratios Skafidas

doi:10.1364/JOCN.9.00A189

Journal of Optical Communications and Networking
Vol. 9,
Issue 2,
pp. A189-A197
(2017)
•https://doi.org/10.1364/JOCN.9.00A189

Space-Time-Coded High-Speed Reconfigurable Card-to-Card Free-Space Optical Interconnects

Ke Wang, Ampalavanapillai Nirmalathas, Christina Lim, Kamal Alameh, and Efstratios Skafidas

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Ke Wang, Ampalavanapillai Nirmalathas, Christina Lim, Kamal Alameh, and Efstratios Skafidas, "Space-Time-Coded High-Speed Reconfigurable Card-to-Card Free-Space Optical Interconnects," J. Opt. Commun. Netw. 9, A189-A197 (2017)

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About this Article
History
- Original Manuscript: June 14, 2016
- Revised Manuscript: September 28, 2016
- Manuscript Accepted: November 4, 2016
- Published: January 23, 2017
Virtual Issues
Journal of Optical Communications and Networking OFC 2016 (2017)

Abstract

Space-time-coded, free-space-based card-to-card optical interconnects for data centers and high-performance computing are proposed and experimentally demonstrated in this paper. Free-space propagation, which enables flexible and reconfigurable interconnections, is used in conjunction with $2 \times 2$ extended Alamouti space-time coding, which reduces the inter-channel crosstalk and improves the sensitivity of the interconnects. Experimental results show that, for $2 \times 2$ 10 Gb/s reconfigurable optical interconnects, space-time coding extends the maximum interconnection range by more than 48% and improves the receiver sensitivity. In addition, the impact of air turbulence on the proposed space-time-coded, free-space-based reconfigurable optical interconnects is experimentally investigated and results show that the interconnect performance is slightly degraded even under relatively strong air turbulence, where the maximum interconnection range is reduced only by around 4 cm.

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Horizontal Distances	Module Connection	Configuration 1		Configuration 2
Horizontal Distances	Module Connection	Channel 1	Channel 2	Channel 1	Channel 2
$D_{12} = 30 cm$	Modules 1 to 2	$< 10^{- 6}$	$< 10^{- 6}$	$< 10^{- 6}$	$< 10^{- 6}$
$D_{23} = 30 cm$	Modules 1 to 3	$6.59 \times 10^{- 5}$	$2.06 \times 10^{- 5}$	$2.68 \times 10^{- 5}$	$3.14 \times 10^{- 5}$
$D_{12} = 50 cm$	Modules 1 to 2	$7.63 \times 10^{- 6}$	$4.56 \times 10^{- 6}$	$2.47 \times 10^{- 6}$	$2.78 \times 10^{- 6}$
$D_{23} = 15 cm$	Modules 1 to 3	$1.53 \times 10^{- 4}$	$7.52 \times 10^{- 5}$	$7.82 \times 10^{- 5}$	$9.15 \times 10^{- 5}$
$D_{12} = 60 cm$	Modules 1 to 2	$7.18 \times 10^{- 5}$	$2.56 \times 10^{- 5}$	$3.33 \times 10^{- 5}$	$4.12 \times 10^{- 5}$
$D_{23} = 15 cm$	Modules 1 to 3	$7.32 \times 10^{- 4}$	$3.98 \times 10^{- 4}$	$3.85 \times 10^{- 4}$	$4.46 \times 10^{- 4}$

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Journal of Optical Communications and Networking