Abstract: This paper reviews the work performed under the
European ESPRIT project DO_ALL (Digital OpticAL Logic
modules) spanning from advanced devices (semiconductor optical
amplifiers) to all-optical modules (laser sources and gates) and
from opticalsignalprocessing subsystems (packet clock recovery,
optical write/store memory, and linear feedback shift register) to
their integration in the application level for the demonstration of
nontrivial logic functionality (all-optical bit-error-rate tester and
a 2 2 exchange–bypass switch). The successful accomplishment
of the project¢s goals has opened the road for the implementation
of more complex ultra-high-speed all-opticalsignalprocessing
circuits that are key elements for the realization of all-optical
packet switching networks.
Abstract: We present a 40 Gb/s asynchronous self-routing network and node architecture that exploits bit
and packet level opticalsignalprocessing to perform synchronization, forwarding and
switching. Optical packets are self-routed on a hop-by-hop basis through the network by using
stacked optical tags, each representing a specific optical node. Each tag contains control signals
for configuring the switching matrix and forwarding each packet to the appropriate outgoing
link and onto the next hop. Physical layer simulations are performed, modeling each optical subsystem
of the node showing acceptable signal quality and Bit Error Rates. Resource reservationbased
signaling algorithms are theoretically modeled for the control plane capable of providing
high performance in terms of blocking probability and holding time.
Abstract: Recent advances in the all-opticalsignalprocessing
domain report high-speed and nontrivial
functionality directly implemented in the optical
layer. These developments mean that the allopticalprocessing of packet headers has a future.
In this article we address various important control
plane issues that must be resolved when
designing networks based on all-optical packetswitched
nodes.
Abstract: Digital optical logic circuits capable of performing bit-wise signalprocessing are critical building blocks for the realization of future high-speed packet-switched networks. In this paper, we present recent advances in all-opticalprocessing circuits and examine the potential of their integration into a system environment. On this concept, we demonstrate serial all-optical Boolean AND/XOR logic at 20 Gb/s and a novel all-optical packet clock recovery circuit, with low capturing time, suitable for burst-mode traffic. The circuits use the semiconductor-based ultrafast nonlinear interferometer (UNI) as the nonlinear switching element. We also present the integration of these circuits in a more complex unit that performs header and payload separation from short synchronous data packets at 10 Gb/s. Finally, we discuss a method to realize a novel packet scheduling switch architecture, which guarantees lossless communication for specific traffic burstiness constraints, using these logic units.
