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.