In this paper, we proposed a novel architecture of MG-OXC
(Multi-Granularity Optical Cross Connect) that can support both the static and dynamic optical switching. It can obviously reduce the complexity of the switching matrix and the number of the switching ports without increasing the network blocking probability. We gave the ILP model to describe the multi-granularity switching optical network. This model is applicable not only to the novel MG-OXC, but also to the traditional MG-OXC network. We also proposed a novel routing and wavelength assignment algorithm for dealing with
multi-granularity traffic in optical network that was set up by this kind of novel MG-OXC. It is shown that when the network load is low, the network blocking probability of the novel MG-OXC will be quite lower than the ordinary multi-layer and single-layer MG-OXC with the strategy of the shortest wavelength path and random choice of the wavelength. While when the network load is comparatively higher, the network blocking probabilities of these structures are more or less the same.
A math model that can describe the effect of stimulated Raman scattering (SRS) on a pilot-tone detection technique is developed. Through numerical simulation, it is shown that the effect of SRS could produce ghost tones. The power of the ghost tone is larger for the channels separated farther from the real tone. The experiment results show that this model can evaluate the effect accurately. The power ratio between real tone and ghost tone increases linearly with the increase of transmission length when wavelengths transmit longer than 300 km.
This paper proposed a novel RWA algorithm based on load balance (RWALB) to solve the dynamic wavelength routing problem in new generation optical networks based on the MPLmS paradigm. In RWALB algorithm, the cost of each link is adjusted dynamically as the overall network status changing. By applying RWALB algorithm the best load balance can be produced in the overall network wavelength resource, the average blocking probability can be reduced significantly and the wavelength resources can be utilized efficiently. Through numeric simulation on NSF and EON network, it is shown that the network performance is significantly improved compared with ordinary RWA algorithm that applies shortest-path algorithm and first-fit (FF) wavelength assignment strategy.
Optical performance monitoring is an import issue for the design, operation and maintenance of optical transport networks (OTN). Pilot tone detection is one of the monitoring techniques used in all-optical WDM networks . This technique is very simple and could monitor both the optical paths and switch failures in a large-scale WDM transport networks. But the effect of Stimulated Roman Scattering (SRS) could product ghost tone that will suppress the capability of pilot-tone based monitoring technique. We give a simple model to analyze the effects of Stimulated Raman Scattering on pilot-tone base WDM supervisory technique.
In this paper, we propose a novel optical packet switching mechanism incorporating void filling that makes some packets switch in optical domain, others in electronic domain. The optical packet switching is solved in time, space, wavelength and electronic domain. We also present numerical simulations under Poisson traffic and variable IP packet length condition. Simulation results have shown improvement in packet loss probability by using our switching mechanism.
The well number and the cavity length of 1.55mm wavelength In1-x-yGayAlx MQW DFB lasers are optimized using a simple model. A low threshold, high maximum operating temperature of 550-560K ,and high relaxation oscillation frequency of over 30 GHz MQW DFB laser is presented.