Given the multicast request , the optimal object of the problem is to minimize total number of conversions required . in wavelength assignment , we should consider the requirements that the number of needed converters along the path from multicast source node to any member cannot be larger than specified value because of the signal distortion introduced by wavelength converters . at last , we present several dynamic programming to get the exact optimal wavelength assignment scheme under session blocking policy and destination blocking policy 考虑到波长转换器引入的信号失真和噪声，引进了失真约束，即要求从组播源结点到每个组播成员的路径上使用的波长转换器数目均在指定的范围之内;对于给定的组播需求，优化目标是在满足失真约束的基础上使整个组播树上使用波长转换器的数目最少;并使用动态规划给出了sbp和dbp两种连接建立策略下精确的最优波长分配算法。
Based on current max - rwa model , the extended max - rwa model is presented by introducing limited - range wavelength conversions . considering signal distortion introduced by wavelength conversions , we propose a new optimization objective , which is to establish the maximum number of connections with the least number of wavelength conversions ?在现有max - rwa模型的基础上提出了波长转换范围受限条件下的扩展的max - rwa模型，在考虑了波长转换器对信号传输造成的损伤的基础上改进了优化目标，新的优化目标要求网络建立的连接数最大并使用尽可能少的波长转换器。
Then the result of certain k - shortest path algorithm is introduced as a set to be chosen by both the simulated anneal algorithm and heuristic algorithm , concerning the end - to - end traffic requirement and restriction on link bandwidth . afterwards , the effect of the value k on the outcome of the simulated anneal algorithm is researched . the network resource is allocated , while the study of link protection problem on traffic routing is introduced and two types of protection , shared protection and dedicated 首先考察实际的网络模型,根据业务需求,引入k路由算法的结果作为模拟退火算法和启发性算法备选路由集合,在链路带宽有限的约束下对网络资源进行分配,同时引入业务路由的通路保护问题的研究,实现了共享保护和专用保护两种通路保护方式;针对全波长转换网络和无波长转换能力网络,根据为所有连接请求所分配的总资源最少和满足请求的业务数目最多两种优化目标对资源分配进行优化,研究了备选路由集大小对模拟退火算法结果的影响;对模拟退火算法与启发性算法的
With the development of networking technologies and new services of internet , there is an explosive growth trend of internet traffic , which needs tremendous network bandwidth . some traditional ip backbone networks are ip / atm / sonet architecture . current transport rate of sonet or sdh is mostly 2 . 5gb / s and 10gb / s 本文研究的是和wdm光网络的有关问题,主要有以下三个方面的内容: wdm网络里各种保护手段的线性规划模型,一种新的基于link - path方式的wdm网络中稀疏波长转换的线型规划模型,以及光迹( lighttrail )中的整数线型规划设计。
But the development of dwdm ca n ' t be satisfied for finite wavelengths . however aowc can make the wavelengths reused . a novel project is explored for signal pulse compression and shaping by utilizing the co - propagating second order super - gauss control pulse and gauss signal pulse in semiconductor optical amplifier 随着超高速密集波分复用( dwdm )和光时分复用( otdm )的日趋发展，要求信号脉冲的脉冲宽度越来越窄和复用的信道数也越来越多，但有限的波长资源不能满足dwdm的发展要求，而波长转换技术可以提高信号波长的重复利用率。
We present an approximate universal analytical technique ( e - rla ) , based on link independent assumption and rla approach , for the blocking performance analysis of all - optical networks with partial wavelength conversion , fixed routing and random wavelength assignment . the proposed technique can be applied to arbitrary networks with arbitrary wavelength conversion configuration and arbitrary traffic mode 我们基于链路独立性假设和rla技术提出了部分波长转换配置方式下波长路由光网络的阻塞性能的通用近似分析方法( e - rla ) ，该方法扩展了rla的适用范围，可以适用于任何网络拓扑、任何业务量分布模式条件下网络中任意链路上配置任意数目转换器情况的研究。
Next , a novel priority - based wavelength assignment algorithm in all - optical networks with partial wavelength conversion is proposed , based on link independent assumption and the method of calculating the network the blocks probability . it improves the routing and wavelength assignment presented by others . this algorithm fits the demand of different business for asking the grade of corresponding different services in the modern all - optical network than the original algorithm 其次研究了部分波长可变wdm网中支持优先级的波长分配问题,以及在此网络中网络阻塞概率的计算;基于链路波长占用独立性假设,改进了在部分波长转换wdm网中已有的rwa算法,提出了一种支持优先级的动态波长分配算法,该算法保证了较高优先级的光路建立请求具有较低的阻塞率,比原有算法更加适合现代光网络中不同业务请求对应不同服务等级的要求。
The results show that wavelength locates in gain zone of semiconductor optical amplifier , and have higher peak power and proper time delay between the two pulses for the second order super gauss control pulse in semiconductor optical amplifier . a high quality amplified signal pulse can be achieved . the chirp can be reduced notability by using cascading soa in cross gain modulation based on soa , and the distance and the peak power of conversion optical pulse can be increased notability , and we can let down the demand for wavelength based on xgm in soa and enhance the flexibility of wavelength conversion 我们应用二阶超高斯光脉冲与高斯信号脉冲同时注入soa和应用soa与非线性光学环镜( nolm )相结合的方案来对信号脉冲进行压缩整形，模拟显示，在调节系统合适参数的情况下，波长位于soa增益区的二阶超高斯控制光脉冲在具有较高的峰值功率和适当时延下输入soa时，最后可以得到放大的高质量超短信号光脉冲；在基于soa的交叉增益调制( xgm )全光波长转换中，采用级联的soa能有效地使反转光脉冲的频率啁啾得到有效降低，波长向下转换的距离和反转光的峰值能量都得到明显提高，降低了利用交叉增益调制( xgm )波长转换中对波长精度的要求，从而提高了波长转换的灵和性。
In this thesis , we focus on the performance issue of wrons with wavelength conversions , especially the limited - range wavelength conversions . the main works and innovations are as follows . partial wavelength conversions , which configures several full - range wavelength converters only at some nodes in wrons , provide a more commercial wavelength conversions configuration 本文研究了波长转换器，特别是限定范围波长转换器对于波长路由光网络的阻塞性能服务率的影响，主要的工作和创新包括以下方面： ?作为更为经济的一种波长转换器配置方式，部分波长转换配置方式只在网络中的某些结点上配置少量的全范围波长转换器。
