Although routing schemes based on global knowledge make most optimal routing decisions, they will occupy many resources to keep the state information of the network up-to-date. In tiffs work, we describe a fuzzy least-congested path (FLCP) routing algorlitm based on hierarchical liformation. Simulation shows that the blocking probability using FLCP is very near to the blocking probability using the least-congested path routing (LCP) algorittm based on global information. Under heavy traffic load, the FLCP alg orlihm is superior to the exhaustive algorittm (EA) and the LCP algorittm with unit information cost. The FLCP algorlitm provides better routing, even withincomplete information. Thus, the algorlitm requires less information of the network, particularly under heavy traffic load. In addition, an improved remote-path routing approach is provided to reduce the blocking probability of connection requests to a node that is many hops away from the source node.

本文运用随机信号的分析方法推导了存在ASE噪声情况下，光纤通信系统误码率的计算公式。利用该式可以根据信号光功率和噪声功率谱密度估算系统的误码率。与实验结果基本符合，从而可以为加光纤放大器的光纤通信系统提供评价信道优，劣的依据。本文还论述了ASE噪声对PIN接收机灵敏度的影响，对于实际系统中接收机的选择具有重要意义。

This paper is contributed to discuss the impacts of group velocity dispersion, nonlinear Kerr effect and polarization mode dispersion in optical fibers. Using split-step Fourier method, we first analytically analyze that the interaction of Kerr effect and polarization mode dispersion results in the pulse asymmetric spectra. Then we study that polarization mode dispersion and group velocity dispersion play their roles independently, and that, depending on the relative magnitudes, the two factors affect the pulse differently. Finally, we research the combined impacts of group velocity dispersion, Kerr effect and polarization mode dispersion. Detailed investigation reveals that the combined effects are different in anomalous and normal group velocity dispersion regime. We point out that increased Kerr effect can suppress the impact of polarization mode dispersion in anomalous chromatic dispersion regime, and that, for the given values of incident power and polarization mode dispersion, anomalous group velocity should be large enough for the polarization mode dispersion to be effectively suppressed by the Kerr effect.

本文从理论上推导了“WDM+EDFA”系统中受激拉曼散射（SRS）的表达形式，并分析了影响受激拉曼散射的因素，得出“WDM+EDFA”系统中拉曼散射的影响与光纤放大器的配置关系极大的结论。进而给出了几种常用配置下受激拉曼散射限制的传输距离和光纤放大器数目的上限。

In this paper we propose a new protocol called trine-space label switching protocol (TSL-SP) in optical burst switching (OBS), and define the terms time-space label (TSL) and time-space routing (TSR). An important concept of response time is introduced ha the trine label mechanism. The TSL-SP is a new technology that can quickly and efficiently forward data with a label on the optical networks. A two-dimension label switched path (TD-LSP) can be set up, that is maintained and deleted by the TSL-SP For clearly illuminating the operation principles of the TSL-SR we propose a new approach of orthogonal trine-space coordinates in which the vertical coordinate is the space label and the horizontal coordinate is the time label. The proposed TD-LSP can tramatically reduce the routing failure probability and greatly improve the link network efficiency compared with other signaling protocols. Moreover, we define the time-space label control plane that can achieve the higher efficiency. When the TSL-SP is applied to networks, switching performance can be improved by two orders compareal to the switching performance with the conventional OBS signaling protocols. The fundamental goal of TSL-SP is to band the signaling and routing functions together closely. Also, the TSL-SP can reduce the complexity of the network, support automatic service offering, and provide traffic engineering.