Architecture design and performance evaluation of multigranularity optical networks based on optical code division multiplexing
Architecture design and performance evaluation of multigranularity optical networks based on optical code division multiplexing
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基于光码分复用的多粒度光网络架构设计与性能评估
DOI：
10.1364/jon.5.001028
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发表时间：
2006
影响因子：
--
通讯作者：
K. Kitayama
中科院分区：
文献类型：
--
作者：
Shaowei Huang;K. Baba;M. Murata;K. Kitayama
在传统的基于波长的多粒度光网络中，波长通常被视为基本的路由单元，导致波长利用率低。在光码分复用（OCDM）技术的基础上，提出了一种新的基于OCDM的多粒度光交叉连接（MG-OXC）。与传统的基于波分复用的MG-OXC相比，它的交换能力得到了扩展，可以支持光纤交换、波带交换、λ交换和OCDM交换。在由基于OCDM的MG-OXC组成的网络中，单个波长可以由称为OCDM-LSP的不同标签交换路径（LSP）共享，并且OCDM-LSP交换可以在光域中实现。为了提高OCDM-LSP配置的网络灵活性，设计了两种实现混合光码-波长转换的交换机。仿真结果表明，在一个波长上只部署5个光载波，就可以使阻塞概率降低2个数量级。此外，与时分复用LSP（TDM-LSP）相比，由于异步可达性和OC转换，OCDM-LSP已被证明允许一个更简单的交换机架构，并实现更好的阻塞性能比TDM-LSP。
Feature Issue on Waveband Switching, Routing, and GroomingIn traditional lambda-based multigranularity optical networks, a lambda is always treated as the basic routing unit, resulting in low wavelength utilization. On the basis of optical code division multiplexing (OCDM) technology, a novel OCDM-based multigranularity optical cross-connect (MG-OXC) is proposed. Compared with the traditional lambda-based MG-OXC, its switching capability has been extended to support fiber switching, waveband switching, lambda switching, and OCDM switching. In a network composed of OCDM-based MG-OXCs, a single wavelength can be shared by distinct label switched paths (LSPs) called OCDM-LSPs, and OCDM-LSP switching can be implemented in the optical domain. To improve the network flexibility for an OCDM-LSP provisioning, two kinds of switches enabling hybrid optical code (OC)-wavelength conversion are designed. Simulation results indicate that a blocking probability reduction of 2 orders can be obtained by deploying only five OCs to a single wavelength. Furthermore, compared with time-division-multiplexing LSP (TDM-LSP), owing to the asynchronous accessibility and the OC conversion, OCDM-LSPs have been shown to permit a simpler switch architecture and achieve better blocking performance than TDM-LSPs.