Asymmetric network architecture suitable for internet traffic

1.提出了一种基于波分复用(WDM)的光环网，实现了对非对称业务的高效复接。提出的方法是将两个方向的光路多路复用到一根光纤上。该保护方案采用光单向路径交换环(OUPSR)。这种单光纤环即使由一个光纤环组成，也可以提供对单个故障的保护能力。我们提出了一种光分插复用器(OADM)结构，使得配置单纤环系统成为可能。阵列波导光栅(AWG)和2×2热光(TO)开关作为光分插复用器(OADM)的插入、分出和直通功能。代价分析验证了该系统在非对称业务下优于现有的双光纤保护环。2.提出了一种新的为带宽预留网络提供高效拥塞控制的TCP拥塞控制方法。我们在Linux内核上实现了该算法，并在MPLS网络上进行了实验，MPLS路由器配置了基于类别的加权公平队列(CBWFQ)。根据RTT的不同，该方案的吞吐量比新的Reno方案高出40%。3.分析了在执行MPLS路径保护时的TCP吞吐量下降特性。在此基础上，考虑了MPLS路径保护网络对网络性能的影响。4.提出了一种微晶玻璃插针物理接触连接器的参数设计方法，并进行了可靠性分析。结果表明，在低回波损耗条件下，一个连接点的成本可以达到现有方法的1/3。

1.A WDM based optical ring network was proposed which enabled efficient multiplexing for an asymmetric traffic. The proposed method is to multiplex both directional optical path to one fiber. The protection scheme adopts an optical unidirectional path switched ring(OUPSR). This one-fiber ring can provide a protection capability for a single failure even if it is composed of one fiber ring. We proposed an optical add-drop multiplexing(OADM) architecture which made it possible to configure the one-fiber ring system. An arrayed waveguide grating(AWG) and a 2 x 2 thermo-optic(TO) switch are operated as an insertion, a drop and a through-pass functions of OADM. A cost analysis verify that the proposed system is superior to the existing two-fiber protection ring for asymmetric traffic.2.A new TCP congestion control method has been proposed to provide high efficiency for a bandwidth reserved network. We implement the TCP algorithm on Linux kernel and experiment it on MPLS network The MPLS routers equip class based weighted fair queueing(CBWFQ). A goodput of this scheme is better than that of new Reno as maximally 40% depending on RTT.3.TCP goodput degradation characteristic is analyzed when MPLS path protection is executed. Based on the results we consider the MPLS path protection network which gives less TCP goodput degradation.4.A parameter designing method and a reliability analysis for physical contact connectors of glass-ceramic ferrules were executed. The results shows that cost for one connecting point can become 1/3 of the existing method for 55dB of low return loss condition.