Abstract
With the rapid growth in Internet traffic, demands for a high-capacity
switching network with low end-to-end latency are being felt. Optical-label
switching, in general, and optical burst switching (OBS), in particular, can
provide such a solution with realizable device technology. This paper is a
summary of the Photonic Network Project undertaken in Japan, wherein we have
implemented a prototype OBS-node testbed based on novel device concepts. A
three-node OBS core testbed and edge nodes operating over payload bit rates
of 10 Gb/s to 40 Gb/s were developed, demonstrating feasibility of the OBS
concept. We report newly developed key photonic building blocks of the OBS
node, namely: a fast matrix switch based on
lead–lanthanum–zirconate–titanate, a bit-rate
transparent tunable wavelength converter based on a monolithically
integrated wavelength converter; a fast tunable wavelength laser diode;
compact arrayed waveguide amplifiers; and athermal, flat-top multiplexers.
Together, with an optical-label recognition scheme implemented in a
field-programmable gate array (FPGA), we have integrated the building blocks
into an optical burst switching-node prototype that can potentially be
scaled up to 64$\, \times \,$64 ports. We have confirmed error-free optical burst forwarding
for more than 10 hops in an OBS network with variable length, asynchronous
burst arrival. We have also achieved a mixed bit-rate optical burst
forwarding and contention resolution with wavelength conversion. We have
also demonstrated coordination of OBS with upper-layer protocols by
implementing an Ethernet-frame-to -optical-burst converter edge node, which
successfully transmitted real application data over the OBS network at 40
Gb/s. Similar results were achieved in a multinode testbed under the field
fiber environments, with a low frame error rate of less than 1$\, \times \,10^{-6}$
© 2009 IEEE
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