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.

Numerical simulations of the trapping and the retrieval processes of three different types of single-pulse photonic packets in a medium with electromagnetically induced transparency (EIT) are performed, and the simulation results for a single-Gaussian-pulse photonic packet correspond to the results of a recent well-known experiment. According to the simulation results, in spite of the fact that all three types of photonic packets, in general, experience a shape-preserving storage process, the single-Gaussian-pulse photonic packet suffers the least distortion. Also, based on our numerical simulation, we present, for the rst time to the best of our knowledge, a shape-and quantum-state-preserving propagation of a multiple-Gaussian-pulse photonic packet in a medium with EIT. According to the simulations, attainment of a quantum random access memory (RAM) for photonic packets is within the bounds of possibility.

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。

Combining IP with WDM is an attractive direction for research. WDM will play an impor-tant role in IP network in future. Now, an urgent problem is how to introduce wavelength routing in an IP network. We solve this problem by designing IP wavelength router, implementing DPDP (default path and dedicated path) method. We prove the reasonableness and feasibility of this design by a prin-ciple experiment. A lot of problems related to this design are also discussed.

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.