1,721,088 research outputs found
Analysis and comparison of hot-potato and single-buffer deflection routing in very high bit rate optical mesh networks
No full textThe steady state behavior of regular two-connected
multihoP networks in uniform traffic under hot-Pobto and a
simple single-buffer deflection routing technique is analyzed for
very high bit rate optical applications. Manhattan Street Network
and ShuffleNet are compared in terms of throughput, delay,
deflection probability, and hop distribution both analytically and
by simulation. It is analytically verified that this single-buffer
deflection routing technique recovers in both networks more than 6O% of the throughput loss of hot-pohto with respect to store-and-forward when packets are generated with independent
the average message length exceeds 20 packets.
destinations. This gain, however, decreases to below 40% when the average message length exceeds 20 packets
Novel packet architecture for all-optical ultra-fast packet switching networks
No full textHeader recognition and packet detection in all-optical networks
using on/otT optical ultrafast signalling at a fixed
wavelength can be implemented by means of recently demonstrated
optical sampling AND gates. A novel packet structure
in which the header is spread in a TDM fashion over the
optical packet allows the number of such AND gates to be
minimised in the routing and receiving blocks thereby best
exploiting the required electronic
CHANNEL LIMITATIONS IN ULTRA-FAST MULTIHOP ALL-OPTICAL SOLITON NETWORKS
No full textNon-regenerative ultra-fast packet switching networks are severely constrained by the optical channel. Limitations on the maximum achievable bit rate and network physical size are presented when soliton pulses are used in a ShuffleNet network with deflection routing
Design and channel constraint analysis of ultra-fast multihop all-optical networks with deflection routing employing solitons
No full textRegular two-connected multihop transparent optical
networks using ultrahigh bit-rate single-wavelength on/off
keying are addressed. A novel solution for packet and node
architecture is introduced to take full advantage of the recently
demonstrated optical samplers and of the electronic processing
capability. Channel transmission error arguments show how the
size of these nonregenerative networks employing deflection
routing is limited for a given optical bit rate. These limits are
quantified for the Manhattan Street Network and ShuffleNet
employing solitons. An upper bound on network performance in
terms of maximum achievable bit rate and throughput for a
given packet error rate is evaluated by taking into account the
soliton self-frequency shift due to Raman scattering, the jitter
due to amplified spontaneous emission noise, the short-range
interaction, and their interplay. Results show that if the packet
error rate is to be bounded below 10^-6, the node-to-node fiber
span cannot exceed a few kilometers for network sizes greater
than 64 nodes when the optical bit rate is as high as 100 Gb/s
Self-clocking scheme for bit synchronization in ultrafast packet switching transparent optical networks
No full textA challenging issue in ultrafast packet switching transparent
optical networks is fast acquisition of synchronisation at the
bit level for packet demultiplexing. In the Letter a novel
scheme is proposed, in which a timing reference is transmitted
along with each data packet in the form of a clock comb.
This comb is extracted at each node reached by the packet
Tor header recognition and, at the destination, for reading oi
that particular packet. The synchronisation problem IS
solved with no need for a phase locked loop, at the expense
of an increased effective packet length
US Pat. 6798945 - Filed Aug 30, 2001 - Cisco Technology, Inc, Lumped raman amplifier for adaptive dispersion compensation
No full textAnalytical modeling of nonlinear propagation in uncompensated optical transmission links
No full textAntibiotics as ligands. The coordinating ability of deprotonated cycloserine towards transition metals
No full textWe report the complexes of the deprotonated cycloserine (ccs) ligand, 4-aminoisoxazolidin-3-one, with the metal ions chromium(III), manganese(II), iron(II), iron(III), cobalt(II), nicke1(II), zinc(II), zirconium(IV), palladium(II), silver(I), cadmium(II), osmium(III), platinum(II) and mercury(II). The tentative structures of the complexes have been assigned on the basis of analytical, spectral(u.v.- visible, i.r. and far i.r.) and magnetic data, and of thermal analyses (t.g. and d.t.g.). These complexes appear to contain ccs as an uninegative bidentate ligand forming five-membered rings in which the O- and the NH2 groups bind to the metals. The ligand field parameters have been evaluated and are in keeping with the proposed structures; they confirm the presence of oxygen-and nitrogen-containing chromophores
Dispersion Compensation and Mitigation ofNonlinear Effects in 111-Gb/s WDMCoherent PM-QPSK Systems
No full textWe carried out an extensive simulative analysis to investigate in depth the potential of electronic dispersion compensation (EDC) in amplified multispan 111-Gb/s wavelength-division-multiplexed systems based on polarization- multiplexed quadrature phase-shift keying modulation with coherent detection, also in the presence of substantial fiber nonlinearity. For typical single-mode and nonzero dispersion-shifted fibers, our results show that the use of inline optical dispersion management is always suboptimal versus using EDC at the receive
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