面向超大型数据中心的无源光连线网络模块化构造原理和方法

With the dramatic increase in number of servers in data centers, traditional wiring networks connecting port directly make the cabling complexity of data center networks extremely high, and thus limit the development of data centers. Passive arrayed waveguide grating routers (AWGRs) have the intrinsic attractiveness in the reduction of the cabling complexity, but a single AWGR is not scalable and thus cannot meet the interconnection requirement of Mega data centers. Therefore, we will propose a method to construct modular AWG-based passive interconnection networks in this project, in order to simplify the cabling complexity of Mega data centers. In particular, based on the wavelength routing properties of AWGRs, we will study the wavelength routing properties and the related algebraic structures of AWGR-based multistage interconnection networks, and investigate the condition of wavelength reuse in the network, which will finally yield the modular AWG-based passive interconnection network with the following features: (1) it can simplify the cabling complexity of data center networks, (2) it can preserve the same function and bandwidth as the original data center network, and (3) it exhibits a good scalability since the size of each employed AWGRs and the number of required wavelengths are both small. The results obtained in this project can be applied not only to the simplification of the cabling complexity of Mega data center networks but also the network application scenarios where the cabling becomes a bottleneck.

在数据中心服务器数量迅速增长的大背景下，传统设备端口直连的连线方式使数据中心网络的连线复杂度越来越高，数据中心发展遭遇瓶颈。无源阵列波导光栅路由器(AWGR)在降低连线复杂度方面具有优势，但单个器件规模无法任意扩展,不能满足超大规模数据中心的需求。为此，本项目拟提出一种基于AWGR的低复杂无源光连线网络模块化构造原理和方法，克服单个AWGR不可扩展的缺点,解决超大型数据中心网络连线复杂的问题。项目将从单个AWGR的波长路由特性入手，研究多级AWGR无源连线网络的路由特性及其代数结构,研究网络的波长重用条件，并由此获得模块化AWGR连线网络的构造方法。项目拟构造的AWGR连线网络将具备如下特点：(1)连线复杂度低；(2)保持原有数据中心网络的功能不变；(3)所使用的AWGR尺寸较小，所需波长数少，扩展性强。本项目研究结果不仅可用于超大型数据中心网络，也可用于其它连线需要简化的网络应用场景。

AWGR在解决数据中心网络连线复杂度方面有优势，但是基于AWG的互连方案的可扩展性受到相干串扰和AWG波长粒度的限制。为此，本项目提出一种基于AWGR的低复杂无源光连线网络的模块化构造方法，解决超大型数据中心网络连线复杂的问题。本项目从单个AWGR的波长路由特性入手，研究多级AWGR无源连线网络的路由特性及其代数结构，研究网络内波长重用的条件，并由此获得模块化AWGR无源连线网络的构造方法。本项目构造的AWGR无源连线网络将具备如下优点：(1)连线复杂度低；(2)保持原有数据中心网络的功能不变； (3)连线网络内所使用的AWGR尺寸较小，网络所需的波长数少，具有很好的扩展性。