The key current challenges for the industrial application of all optical switching networks are energy consumption, transmission rate, spectrum efficiency, and switching throughput. The energy consumption problem is mainly researched in this paper. From the perspective of components and modules, node equipment, and network levels, different enabling technologies are proposed to overcome this problem, which are also evaluated through different experimental demonstrations. First, high-sampling-rate digital-to-analog converters (DACs) and WSS-based ROADM modules are demonstrated as components and modules for energy-efficient all optical switching networks. Then, an all optical transport network test-bed consisting of 10 Pbit/s level all optical switching nodes based on multi-level and multi-planar switching architecture is experimentally demonstrated for the first time, which can reduce power consumption by 43%. A control architecture for energy-efficient all optical switching networks is built with OpenFlow based software defined networking (SDN), and experimental results are given to verify the performance of this control architecture. Finally, we describe an All Optical Networks Innovation (AONI) project in China, which aims to explore transmission, switching, and networking technologies in all optical switching networks, and then two application scenarios are forecast based on the technical breakthroughs of this project.

Passive optical network (PON) is viewed by many as an attractive solution to the first mile problem. With the rapidly increasing number of users and bandwidth intensive applications, upgrading current PON architecture with the wavelength division multiplexing (WDM) technology has become a natural choice. Multiple WDM PON architectures have been proposed, yet to the best of our knowledge none could support deterministic quality of service (QoS) so far. In this paper we propose a two-level WDM EPON solution which provides two main functions: efficient network scaling with bandwidth sharing at the wavelength level, and deterministic QoS provisioning at the EPON level. To guarantee deterministic QoS for multiple classes, an efficient admission control scheme based on network calculus has been developed in conjunction with the scheduling discipline. We evaluate the performance of our scheme by means of extensive simulations, and show that it could not only provide deterministic QoS to bursty traffic but also achieve high utilization of resources.

The new IEEE 802.lie standard is designed to provide QoS guarantees to different types of multimedia applications in WLAN. IEEE 802.lie defines two channel access mechanisms: HCCA and EDCA. Basically, HCCA is more suitable for providing strict QoS guarantees than EDCA because of its centralized TXOP allocation manner and enhanced capability of initiating a transmission at any time during the beacon interval. Nevertheless, the HCCA scheduling scheme is not yet consummate in the current standard and it only performs well under CBR real-time traffics. In this paper, we propose a scheduling algorithm and admission control policy based on Service Curve theory that can deal with bursty traffic while strict delay bounds can be provided for traffic streams. We conduct extensive simulations to evaluate our scheme and the experiment results show good improvements upon the reference scheduling algorithm of HCCA.