Proposed in this paper is a novel packet-level self-synchronization scheme for slotted optical packet-switched networks (OPNs), where a clock denoting the beginning of each packet is extracted to perform address recognition, ultra-fast optical sampling, or payload delineation. The effect of self-phase modulation (SPM) in semiconductor optical amplifier (SOA) and the interfering characteristics of Mach-Zehnder Interferometer (MZI) are combined to make the proposal simple, fast and integrable, with no special treatment at wavelengths, polarization, intensity, or bit-period of the marker pulses.
A detailed analytical model for hot-potato ShuffleNet with limited wavelength conversion is presented in this paper for the first time. Network simulations are performed to validate the results of theoretical analysis. The analytical and simulation results show that the performance of ShuffleNet under limited wavelength conversion improves with wavelength conversion degree dw, and the efficiency of contention resolution per wavelength conversion degree decreases largely with increasing dw. ShuffleNet performs well with limited wavelength conversion and can achieve performance close to that of full wavelength conversion adopting a wavelength conversion degree as small as 8 for nodes equipped with 16 wavelength channels. The results presented in this paper are interesting and valuable in the designation of the other kind of multi-path optical packet networks.
The emergence of intelligent optical network (ION) not only introduces the function of intelligent connection control, but also makes some new-style optical layer services possible. There are many kinds of survivability schemes applied in ION with mesh topology. According to the recovery degree of traffic, differentiated resilience service (DRS) can provide an appropriate survivability scheme from them. In this paper, a differentiated resilience service scheme in intelligent optical network is proposed. We firstly discuss some relative problems of DRS, and then define some DRS degrees in terms of recovery time for traffics. At last, the DRS protection/restoration modules of control plane in ION are designed and analyzed. Thus a DRS implementation method in ION is formed.
A synthetical equation set about optical fiber nonlinear in WDM transmission system is proposed in this paper. A supplementary Split-Step Fourier Method to solve the equation is proposed too. The equation and its numerical method can be used to analyze different fiber nonlinear effects, which will also do great help to simulating and analyzing the performance of WDM transmission system.
This paper discusses functional requirements of optical path cross-connect (OPXC) node. Generic optical path cross-connect (OPXC) node architectures are introduced, and a new OPXC node architecture is proposed. OPXC node architectures are assessed. A transport system with two new OPXC nodes and a 100km dispersion-shifted fiber are simulated. It shows that the new OPXC architecture is superior to generic OPXC architectures.
Atomic functional architecture model has been accepted by ITU-T to describe the functional architecture of transport networks as well as equipment specification in an implementation independent way. With the existing functional architecture components four different solutions have been proposed to model the complex optical channel (OCh) layer network. One approach is to assign 3-R to the OMS/OCh adaptation function; the second approach is to introduce dedicated transparent layers or to split single OCh layer into several sub-layers; the third is to be deployed by using an abstract characteristic information (CI) definition; the last is using super layer architecture component. This paper analyzes these four methods and presents a new approach by introducing virtual layer network and virtual CI. Virtual adaptation, virtual connection point and virtual link connection are also introduced in order to cover the different transparent connections within a layer network. In addition, examples of using virtual layer component to model the OADM with transparent pass-through and to provide the necessary transparent connections for optical network elements are presented in this paper.
A protection scheme that chooses protection routes in advance in All-Optical Mesh network is proposed in this paper. Two rules, minimum relativity among routes and minimum the number of hops, are given and analyzed in detail. In order to perform protection quickly and correctly, the compromise between two principles must be considered when choosing protection routes. The protection method that appointing ring networks in mesh networks is proposed too. In addition, some key technologies such as avoiding oscillation, line protection and misconnect squelched are also proposed in this paper.
Two novel kinds of reconfigurable multi-path OADM structures based on MZI with FBGs are proposed in this paper. These novel OADM is determined by adding/dropping different wavelengths making use of optical switches and tunable FBGs. There are very low incoherent crosstalk and no any coherent crosstalk in these novel OADMs in theory. So very large scaling of the network which is composed of the novel OADMs is demonstrated in the paper.
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