Multi-Granularity optical switching technology has only recently attracted attention from the optical networking industry for its practical importance in reducing port count, the associated control complexity, and the cost of optical cross-connects (OXC). In this paper, the advantage of MG-OXC comparing to the ordinary OXC is introduced and the Multi-Granularity Optical Switching test-bed based on ASON (Automatically Switching Optical Network) is presented. This test-bed is composed of three different plants, namely the transport plane, the control plane and the management plane. We have analyzed the architecture of MG-OXC and provided the scheme of multi-granularity optical switching node. In the end some experiments have been done. We firstly have done the experiment in the creation and release of optical path. The optical path could be a wavelength path or a waveband path. And the second experiment has been done to test the capacity of the traffic grooming in the multi-granularity optical networks. The last experiment is performed to test the protection and restoration under the conditions of the node failure, the wavelength failure and the waveband failure, etc. Finally the results are reported and they show that the test-bed can achieve the expected functions under the control of the control plane of ASON.
In this paper, for the first time, we analyze the optical exclusive OR (XOR) gate based on cross-polarization modulation (XPolM) effect in semiconductor optical amplifier (SOA) using nonlinear polarization rotation (NPR) theory. The extinction ratio (ER) of optical XOR gate, which reflects the performance of the gate, is calculated in consideration of the injected current, the length and the polarization angle of input signals of the SOA. The performance of the optical XOR gate can be optimized for some proper parameters of the SOA.
In this paper, for the first time, we analyze theoretically the wavelength conversion based on semiconductor optical amplifier (SOA) using nonlinear polarization rotation (NPR) theory. The non-inverted wavelength conversion is obtained through numerical simulation. The extinction ratio (ER) of the converted signal is over 20 dB, which accords with the experimental result. We investigate the performance of non-inverted wavelength conversion considering some parameters. The research result in this paper shows that we may accomplish wavelength conversion using NPR in SOA well.
Currently Metropolitan Area Optical Networks are still based on SDH/SONET technologies. The disadvantages of such a rigid SDH/SONET rate hierarchy, especially when data applications such as Ethernet are considered, were soon realized. At the same time fast, link setup and release, and dynamic increase and decrease of the link bandwidth will be the scene of the future network. In order to meet the new requirements, the future network will combine with ASON/GMPLS, which is just the protocol to provide the basic function of topology and resource discovery and fast connection provision with intelligence. In this paper we discuss the new technologies and their combination in metropolitan area networks.