Abstract
An intra-data center architecture employing a cost-effective multi-level transmission scheme is
presented. Unlike related previous works, the proposed scheme enables the optical multiplexing of two
asynchronous and independent
optical streams into an eight-amplitude phase-shift keying signal. The scheme is particularly suitable for intra-data
center scenarios, where cost-effective solutions have to guarantee adequate bandwidth flexibility. The proposed
transmitter successfully multiplexes two data streams, namely a 40 Gb/s differential quadrature phase-shift
keying signal and a 10 Gb/s on–off keying one, coming from two separate (and not synchronized) apparatus.
The experimental implementation, including two non-coherent receivers, reveals satisfactory performance ensuring a
correct functionality (bit error rate <10
$^{-9}$
) for an optical
signal-to-noise ratio of about 31 dB. The design of an intra-data center switch architecture encompassing the
proposed transmission scheme is then presented. Additionally, the switch includes a specifically defined OpenFlow
control enabling bandwidth flexibility according to application service requirements. The overall solution has been
successfully implemented and demonstrated in an experimental testbed including traffic tributaries provided through
off-the-shelf network elements. The overall configuration is successfully completed within a few milliseconds only.
© 2014 IEEE
PDF Article
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