Core Mechanism And Key Technologies Of Burst-Mode Optical Data Transport And Packet-Mode Optical Multicasting

In existence for over a decade now, optical transport networks have traditionally been designed for voice transmission based on time division multiplexing (TDM) technology. At that time, voice traffic was significantly more important than data traffic. As a result, synchronous optical network/synchronous digital hierarchy (SONET/SDH) became the dominant standard on these networks. Those technologies have been able to meet the initial requirements of TDM services quite adequately and today, most of them are based on SONET/SDH technology.With the explosion in the demand for bandwidth for data transmission, it became quite clear that the traditional SONET/SDH networks need to be reengineered to handle data traffic in a more efficient way. To this end, this dissertation starts off from the performance requirements of the services to the carrier networks and mainly focuses on the research on the services-oriented dynamic optical network technologies. The detailed contents can be divided into two parts:one is the novel optical network architecture and the transport technologies towards the'bursty'nature of the data services and their various performance requirements; the other is the novel packet-based all-optical multicasting technologies and their implementations in the dynamic optical networks. The contributions of this doctoral dissertation mainly can be summarized as follows.1.The research on the acoustic-optic tunable filter (AOTF)-based fast tunable burst receiving technology for the WDM-based ring networks. It employs the AOTFs to realize the fixed transmitter and tunable receiver (FTTR) scheme and adopts the round-robin token scheme to avoid the bursts'contentions. Both numerical and simulated modeling techniques were applied to analyze the influence on the performance of this technology caused by the parameters, such as the minimum and maximum burst length, the circumference of the ring, and so on.All the results show that to design a high-performance token-based burst-mode WDM ring network, not only the common parameters, such as the number of nodes and wavelengths, and the circumference of the ring, but also the special parameters, such as the minimum and maximum burst length, and the offset time should be taken into account.2. The research on the next-generation WDM-based carrier-grade Ethernet. This dissertation extends the concept of the Resilient Packet Ring (RPR, IEEE 802.17) to WDM networks and proposes a novel network architecture called Resilient Burst Ring (RBR). This architecture inherits all the best features of RPR, provides a burst-mode data transmission scheme through a two-sublayer (optical and electronic) hierarchy, and realizes the WDM-supported ultra-high-speed Ethernet with scalability and reliability. RBR adopts a two-layer buffering scheme to resolve the contentions of optical burst packets and provides three different data transmission modes. With the proposed Priority-Only-Destination-Delay resource reservation control protocol, RBR can provide a flexible QoS strategy to implement the transmission of all of the applications and services in existing networks.3. The research on the novel all-optical multicasting schemes and their implementations in the dynamic optical networks. To increase the multicast success ratio, a serial-mode and a hybrid-mode optical multicasting scheme are proposed in this dissertation. The serial-mode multicasting scheme uses a separated multicast module to realize the storage, duplication and serial export of the input optical multicast packets. It can partly perform the function of the optical random memory and, therefore, improve the performance of multicasting in the all-optical networks. The hybrid-mode multicasting scheme is proposed to reduce the signal impairment and the extra delay caused by the serial-mode multicasting scheme. It combines the parallel mode and the serial mode multicasting schemes, realizes the duplication and storage of the input optical multicast packets, and exports multiple copies each time. By computer simulations, results show that the hybrid mode multicasting scheme had the best performance in the optical packet switched networks. Besides, this dissertation also does some simulated and experimental researches on the performance of the serial-mode multicasting scheme and proposed a delayed resource reservation scheme for delivering multicast sessions in the labeled optical packet switched networks.With the delayed resource reservation scheme, contentions can be avoided and steady data transport pipelines for multicast sessions can be established from the source node to all the destination nodes. Consequently, QoS for those multicast sessions can be guaranteed effectively in the labeled optical packet switched networks.