Abstract: We present an almost all-optical node
architecture suitable for on-the-fly packet and burst
switching without losses. The operation of the node is based
on wavelengthconverters for mapping the incoming to the
outgoing links, and for intra-node contention resolution. The
node can be built out of commercially available equipment,
and is easily scalable, with respect to the number of its
incoming and outgoing links, by simple addition of
components.
Abstract: We present an architecture for implementing optical
buffers, based on the feed-forward-buffer concept, that can truly
emulate input queuing and accommodate asynchronous packet
and burst operation. The architecture uses wavelengthconverters
and fixed-length delay lines that are combined to form either a
multiple-input buffer or a shared buffer. Both architectures are
modular, allowing the expansion of the buffer at a cost that grows
logarithmically with the buffer depth, where the cost is measured
in terms of the number of switching elements, and wavelengthconverters are employed. The architectural design also provides
a tradeoff between the number of wavelengthconverters and their
tunability. The buffer architectures proposed are complemented
with scheduling algorithms that can guarantee lossless communication
and are evaluated using physical-layer simulations to
obtain their performance in terms of bit-error rate and achievable
buffer size.
Abstract: We present an architecture for implementing optical
buffers, based on the feed-forward-buffer concept, that can truly
emulate input queuing and accommodate asynchronous packet
and burst operation. The architecture uses wavelengthconverters
and fixed-length delay lines that are combined to form either a
multiple-input buffer or a shared buffer. Both architectures are
modular, allowing the expansion of the buffer at a cost that grows
logarithmically with the buffer depth, where the cost is measured
in terms of the number of switching elements, and wavelengthconverters are employed. The architectural design also provides
a tradeoff between the number of wavelengthconverters and their
tunability. The buffer architectures proposed are complemented
with scheduling algorithms that can guarantee lossless communication
and are evaluated using physical-layer simulations to
obtain their performance in terms of bit-error rate and achievable
buffer size.
Abstract: In this paper we discussed different switch architectures. We focus mainly on optical buffering. We investigate an all-optical buffer architecture comprising of cascaded stages of quantum-dot semiconductor optical amplifier- based tunable wavelengthconverters, at 160 Gb/s. We also propose the optical buffer with multi-wavelengthconverters based on quantum-dot semiconductor optical amplifiers. We present multistage switching fabrics with optical buffers, where optical buffers are based on fibre delay lines and are located in the first stage. Finally, we describe a photonic asynchronous packet switch and show that the employment of a few optical buffer stages to complement the electronic ones significantly improves the switch performance. We also propose two asynchronous optical packet switching node architectures, where an efficient contention resolution is based on controllable optical buffers and tunable wavelengthconverters TWCs.
Abstract: The authors demonstrate an optical buffer architecture which is implemented using quantum dot semiconductor optical amplifiers (QD-SOAs) in order to achieve wavelength conversion with regenerative capabilities, for all optical packet switched networks. The architecture consists of cascaded programmable delay stages that minimise the number of wavelengthconverters required to implement the buffer. Physical layer simulations have been performed in order to reveal the potential of this scheme as well as the operating and device parameters of QD-SOA-based wavelengthconverters. The results obtained have indicated that, up to three time-slot interchanger (TSI) cascaded stages show good performance at 160 Gb/s in the 1550 nm communication window.
