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Proceedings Paper

Demonstration of 720×720 optical fast circuit switch for intra-datacenter networks
Author(s): Koh Ueda; Yojiro Mori; Hiroshi Hasegawa; Hiroyuki Matsuura; Kiyo Ishii; Haruhiko Kuwatsuka; Shu Namiki; Ken-ichi Sato
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Paper Abstract

Intra-datacenter traffic is growing more than 20% a year. In typical datacenters, many racks/pods including servers are interconnected via multi-tier electrical switches. The electrical switches necessitate power-consuming optical-to- electrical (OE) and electrical-to-optical (EO) conversion, the power consumption of which increases with traffic. To overcome this problem, optical switches that eliminate costly OE and EO conversion and enable low power consumption switching are being investigated. There are two major requirements for the optical switch. First, it must have a high port count to construct reduced tier intra-datacenter networks. Second, switching speed must be short enough that most of the traffic load can be offloaded from electrical switches. Among various optical switches, we focus on those based on arrayed-waveguide gratings (AWGs), since the AWG is a passive device with minimal power consumption. We previously proposed a high-port-count optical switch architecture that utilizes tunable lasers, route-and-combine switches, and wavelength-routing switches comprised of couplers, erbium-doped fiber amplifiers (EDFAs), and AWGs. We employed conventional external cavity lasers whose wavelength-tuning speed was slower than 100 ms. In this paper, we demonstrate a large-scale optical switch that offers fast wavelength routing. We construct a 720×720 optical switch using recently developed lasers whose wavelength-tuning period is below 460 μs. We evaluate the switching time via bit-error-ratio measurements and achieve 470-μs switching time (includes 10-μs guard time to handle EDFA surge). To best of our knowledge, this is the first demonstration of such a large-scale optical switch with practical switching time.

Paper Details

Date Published: 7 March 2016
PDF: 6 pages
Proc. SPIE 9775, Next-Generation Optical Networks for Data Centers and Short-Reach Links III, 97750J (7 March 2016); doi: 10.1117/12.2211998
Show Author Affiliations
Koh Ueda, Nagoya Univ. (Japan)
Yojiro Mori, Nagoya Univ. (Japan)
Hiroshi Hasegawa, Nagoya Univ. (Japan)
Hiroyuki Matsuura, National Institute of Advanced Industrial Science and Technology (Japan)
Kiyo Ishii, National Institute of Advanced Industrial Science and Technology (Japan)
Haruhiko Kuwatsuka, National Institute of Advanced Industrial Science and Technology (Japan)
Shu Namiki, National Institute of Advanced Industrial Science and Technology (Japan)
Ken-ichi Sato, National Institute of Advanced Industrial Science and Technology (Japan)
Nagoya Univ. (Japan)


Published in SPIE Proceedings Vol. 9775:
Next-Generation Optical Networks for Data Centers and Short-Reach Links III
Atul K. Srivastava, Editor(s)

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