随着网络技术的发展，宽带视频、多媒体等业务的兴起，Internet数据传送的迅速增加，对广域骨干网的带宽要求越来越高。将波分复用(WDM)技术作为基础技术的光传送网络，具有巨大的带宽优势和良好的灵活性而成为当前光通信领域研究的重点。利用WDM传输技术和路由选择和波长分配(RWA)技术的光传输网成为新一代高速骨干网发展的主要方向。 同一条光纤中复用的波长数目有限，当网络中无波长转换节点时，源节点和目的节点间的通信连接必须承载在同一波长通路上，即波长连续性限制。优化光通路的路由选择及波长分配(RAW)成为网络设计的核心问题，其主要任务是寻找一条适合的光通路，并合理地分配波长，使有限的网络资源得到充分的利用，尽量降低网络的阻塞率，以提供尽可能大的通信容量。 IP与WDM技术的融合是当今网络技术发展的一个重要方向，可编程光分插复用器(OADM)以及光交叉连接器(OXC)等光网络器件的应用，通用多协议标记交换(GMPLS)的提出为IP over WDM提供了强有力的支持。将WDM层的RAW问题与IP层的路由问题综合考虑，即联合路由，能更好地保持全网负载平衡，利用网络资源。采用GMPLS框架可以更好地将IP层和WDM层统一到同一个控制平面，扩展后的OSPF协议以及MPLS信令（如RSVP或LDP）可以在路由器和OXC之间交换信息。为了支持智能光网络的波长分配和路由选择，文中提出GMPLS联合路由策略。GMPLS对传统路由协议进行扩展，引入GMPLS控制平面，完成光通路信令的传送，路由选择等功能。重点研究了两种改进算法：基于多约束最短路径优先的算法和基于动态门限的波长分配算法。在基于多约束最短路径优先的算法中，从约束参数和路由计算两方面对算法进行改进，建立仿真模型，通过仿真验证改进算法的有效性：实现了路径保护和重路由，降低了网络的拥塞率，提高网络资源的利用率。在基于动态门限的波长分配算法中，引入动态门限的概念，利用基于遗传算法的神经网络预测器求出门限值，设计算法的流程，建立仿真模型，通过仿真验证算法的有效性：引入动态门限后可以根据实时网络动态的划分各个波长子集，解决波长路由分配的局限性，降低网络拥塞的发生率，提高整个网络的公平性，优化网络。上述研究为进一步研究大规模光网络的路由和波长分配问题提供了新的思路，在工程实践上具有一定的指导意义。

With the development of networks，the growth of broadband video，multimedia，and other emerging business，data transfer in internet increased so much, All about these made increasing demands for the backbone bandwidth of wide area network．Optical Transmission Network based on WDM technique had become a hot research field now，because of its large capacity and agility．Therefore，all-optical networks based on the concept of WDM and wavelength routing RWA is considered as a competitive candidate for the backbone transport network of next generation． Because the numbers of the wavelengths which are multiplexed in a single fiber are 1imited，without wavelength conversion，all the communication of the route roust use the same wavelength，namely wavelength continuity limited．One of the key issues in optical network design is to optimize Routing and Wavelength Assignment(RWA)for optical paths．RAW solves how to find out an appropriate optical paths and assign a wavelength reasonably in order to make full use of the limited resource and provide communication capability as large as possible．So we must perform effective RWA to try to reduce the network's blocking rate and make the best use of the sources in the network． The fusion of IP and WDM technology is an important direction of Today's network technology development. The application of Optical Transmission Network equipment such as OADM, OXC and so on, the offering of GMPLS, which provide a strong support for IP over WDM. The routing problem of RAW WDM layer and IP layer are dealt with in an integrated manner, namely Joint routing, to better keep the entire network load balance, use of network resources. The GMPLS framework can better will IP layer and layer to the same control WDM uniform plane, and that, the expansion of the OSPF agreement and MPLS signaling(such as, RSVP or LDP) can change information between the router and OXC. In order to support intelligent optical network wavelength assignment and routing，GMPLS unified routing strategies is proposed in this paper. GMPLS expands the traditional routing protocol, leads up the GMPLS control plane, completes access of light signaling transmission, routing, and other functions. This paper focuses on the research of the two algorithms: Based on constraints shortest path first algorithm and Based on the dynamic threshold wavelength assignment algorithm. In the constraints shortest path first algorithm, the constraint parameters and routing computation two aspects of the algorithm are improved, simulation model is established，we verify the effectiveness of the modified algorithm through the simulation results. It realizes the path protection and reroute service, reduces the network congestion rate, improves the network resources utilization rate. In the wavelength assignment algorithm based on the dynamic threshold, lead up the concept of dynamic threshold, make use of neural network predictor based on genetic algorithm f go out the threshold value, design the process of algorithm, simulation model is established，we verify the effectiveness of the modified algorithm through the simulation results. It may plot out each wavelength subset dynamically according to the real-time network, solves the limitations of wavelength routing distribution, reduce the incidence of network congestion, improve the whole network of fairness, optimize network. All of the research provides some new illumination for further study in huge scale optical network’s RWA problem, has some significance to engineering.