Performance of a resource-efficient provisioning framework (RPF) is evaluated in this paper in wavelength-continuous optical networks under static traffic. The structure of the survivable routing problem is unraveled by an integer linear programming (ILP) model. Numerical results from direct ILP approaches show that the RPF still achieves more than 10% capacity savings over the traditional provisioning framework when subject to the wavelength-continuity constraint. Next, Resource-Efficient Two-stEp Routing subject to Wavelength-ConTinuity constraint (RETER-WCT) algorithm is developed to overcome the drawback of the ILP approach.
Service differentiated survivable WDM mesh networks providing dedicated path protection and shared path
protection are investigated under scheduled traffic. Scheduled routing with holding-time aware and unaware
are studied for comparison. To tackle the service provisioning problem, an integer linear programming(ILP)
formulation is presented for either situation to find the optimal service provisioning solution for a given set of
traffic demands. Numerical results show that over 48% capacity savings are achieved when the holding-time
knowledge is exploited.
Capacity allocation(CA) problem modelled by a new method for time-varying traffic is formulated and solved.
An upper bound of the capacity saving is given by theoretical analysis. The numerical results show that approximately
25% of the total required capacity can be saved which corresponds to the theoretical analysis.
We firstly propose an approach to compensate the polarization mode dispersion (PMD) effectively in optical
true time delay (TTD) system composed of a Faraday Rotation Mirror (FRM), a normal 3-port circular. The
TTD system can preserve an arbitrary input state of polarization regardless of any external perturbations, and
is complete free from polarization effects. We demonstrate experimentally the polarization-stability of the TTD
system and discuss the RF correspond of the TTD system.
A novel scheme of one access point with multi-service wireless signals for radio over fiber systems is proposed. The
generation of two 200Mb/s wireless signals with central frequencies at 17.5GHz and 20GHz carried on one optical
wavelength is the preliminary result of the concept-proof experiment.
Dispersion-induced radio-frequency (RF) power degradation in the optical true time delay (OTTD) module implemented
by a broadband light source (BBLS) and a dispersion element is studied in this paper, both theoretically and
experimentally. Theoretical results indicate that compared with that using a tunable laser source (TLS), OTTD using a
BBLS suffers from extra power degradation, and that when the transfer function of the tunable optical filter (TOF) can
be approximated to be rectangular, at additional frequencies besides the power-vanishing frequencies in the case of using
TLS, the phenomenon of electrical power-vanishing can also be observed. Experiments using a TLS and a BBLS are
performed for comparison, and TOFs of different bandwidth are used. The electrical transfer functions are measured and
prove the conclusion of the theory. The electrical power-vanishing frequencies are provided and in good agreement with
the theoretical values.
A novel method to generate ultra-wideband (UWB) signals based on two differential group delay modules and one
Mach-Zehnder Modulator is proposed. Both simulation and experiments verified that the method could generate two
kinds of UWB monocycles using low bit-rate non-return-to-zero data source (1Gbps). The monocycles have a fractional
bandwidth of 127% at centre frequency 5.5GHz.
In this paper the influence of routing and wavelength assignment (RWA) algorithms on the blocking probability in wavelength division multiplexing (WDM) all optical network under the condition of static routing was studied. The Single Route and Reroute routing strategies, longest path first (LPF) and shortest path first (SPF) wavelength assignment strategies were compared respectively. In moderately connected network, it is proved by numeric simulation that lower blocking probability can be obtained by Reroute and SPF strategy in virtual wavelength path (VWP) mode. While in wavelength path (WP) mode, when the traffic load is low, Reroute and LPF strategy should be adopted; when the traffic load is high, Reroute and SPF should be adopted. In lowly connected network, Reroute strategy has no effect, so Single Route can be used combined with SPF strategy.
In this paper, routing and wavelength assignment (RWA) algorithms whose optimum object is the minimum number of wavelength required (MNWR) in WDM All Optical Network were studied. Since the number of wavelength required (NWR) obtained by the existing two RWA algorithms is associated with the numbering order of the nodes in the network, a statistical method was proposed to modify the RWA algorithms. With statistical method, a smaller NWR can be acquired. And, it is the first time that the statistical method was proposed to compare the RWA algorithms. Two RWA algorithms can be compared by contrasting the distribution of the NWRs obtained by each RWA algorithm.
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