Design Of The Interface In Large-Scale Computing Systems

Due to the bottleneck of the traditional electrical interconnection, there is an urgent need to apply optical interconnection in the fast developing large-scale computing systems. As one of important branches of large-scale computing systems, data center is expected to support emerging new types of services and thus contains various kinds of traffic with different requirements on networkinglatency. But in the existing researches of optical interface, how to effectively accommodate such traffic is rarely considered. Therefore, this thesis proposes a design of optical interface which can automatically adjust its assembly mechanism to adapt different types of traffic, with emphasis on the corresponding implementation of the assembly module of the optical interface based on FPGA and embedded CPU hardware platform.In addition, optical performance monitoring (OPM) plays an important role to improve the performance of future all optical networks. Currently, the OPM application has been intensivelyinvestigated in previous works. However, there are few reports about OPM module design. Therefore, this thesis, for the first time,designs and implements an OPM module for the dynamically reconfigurable optical network to realize OSNR monitoring based on low frequency beat-noise power detection. Furthermore, by using the implemented OPM module and extended OpenFlow protocol, anintelligent WSON node with OPM capability is investigated.The main achievements of this thesis can be summarized as follows:1) We designed an optical interface for data center network which can automatically adjust its assembly mechanism to adapt different types of traffic. In particular, we investigated the implementation of the assembly mechanism based on a FPGA platform. Through FPGA waveform simulation, all sub-modules related with assembly mechanism were verified to work well.2) Considering the control requirements of optical interface in data center, we extended the Vendor messages in OpenFlow protocol to enable service type awareness and dynamic configuration of assembly mechanism for the central controller. Based on a network testbed, we verified the feasibility of the extended OpenFlow protocol.3) We designed an OPM module to realize OSNR monitoring based on low frequency beat-noise power detection for the first time. The OPM module is feature of a simple structure, high monitoring speed and beingtransparent to modulation formats. In the experiment, the OPM module was verified to be capable of monitoring the OSNR of10Gb/s NRZ QPSK and10Gb/s NRZ OOK signals in less than dozens of milliseconds.4) Based on the implemented OPM module, we designed a WSON optical node which supports OPM monitoring and OpenFlow control interface. Besides, we focused on how to extend the OpenFlow prtocol to enable the network controller to control the OPM module and WSS-based optical switch.