Asymmetric network architecture suitable for internet traffic

1.提出了一种基于波分复用的光环网络，实现了非对称业务的高效复用。提出的方法是将两个方向的光路复用到一根光纤中。该保护方案采用光单向路开关环（OUPSR）。这种单光纤环可以为单个故障提供保护能力，即使它是由一个光纤环组成的。我们提出了一种光加丢复用（OADM）架构，使单光纤环系统的配置成为可能。阵列波导光栅（AWG）和2 × 2热光（TO）开关作为OADM的插入、下降和通通功能操作。成本分析验证了所提出的系统在非对称业务中优于现有的双光纤保护环。为了提高带宽预留网络的效率，提出了一种新的TCP拥塞控制方法。我们在Linux内核上实现了TCP算法，并在MPLS网络上进行了实验。MPLS路由器采用基于类的加权公平排队（CBWFQ）。根据rtt的不同，该方案的性能优于新雷诺，最高可达40%。分析了执行MPLS路径保护时TCP的good - put退化特性。在此基础上，我们考虑了TCP good - put降级较小的MPLS路径保护网络。对玻璃陶瓷插箍物理接触连接器进行了参数设计方法和可靠性分析。结果表明，在55dB低回波损耗条件下，一个连接点的成本可降至现有方法的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.