Abstract
In this paper, we propose a novel optical pyramid data center network
architecture (OPMDC), achieving scalable and high bandwidth, low latency, and reduced
power consumption and wiring complexity. Based on an incremental and modular design, a
full-scale OPMDC is built on three types of WSS-based optical switching nodes in three
tiers. These optical nodes are recursively interconnected according to a pyramid
structure parameterized by the number of nodes (B) at the base. Such a pyramid-based
topology facilitates horizontal mesh connections that are tailored to achieve flexible
optical packet-based transport. To this aim, we design a wavelength scheduling
algorithm, called most-contentious-first, augmented with source and destination relay
and aggregation (SDRA) via the horizontal mesh connections in the source and destination
pods. Simulation results show that employing SDRA results in a vast improvement of
throughput from 42.5% to 87.9% at full load, at a cost of no more than two additional
hops of latency. Further, we present our OPMDC (B = 7) prototype and provide performance assessment and the measurements of
packet latency. Finally, experimental results show that after travelling the longest
possible path with six optical nodes in OPMDC, the signal suffers no accumulated
distortion and noise from the cascades of WSS and EDFA modules.
© 2015 IEEE
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