The Research On All-Optical Virtual Private Network And Novel Service Delivery In Passive Optical Networks

In China, from 2000 to 2007, the exporting amount of the Internet data has been increased from 351 Mb/s to 256,696 Mb/s, with a huge increasing ratio of about 730 times within past seven years, and the increase in 2006 is high up to 88.6%. The exposion of network bandwidth mainly comes from the quickly increase of the data service. We are facing the increasing requirement of new emerging services, such as point-to-point connections and sharing, video delivery and diverse service integration. Therefore it is far from enough to meet the requirement only by enhancing the back-bone transmission capacity. It is highly desired to develop the technologies of high-speed, broadband, flexible and low-cost access network. Under such circumstance, optical fiber access network has been a hot research topic in both the academia and industry.Passive optical network (PON) is a promising candidate in future access areas to provide broadband services with low cost. With all-optical virtual private network (VPN) function, PON can support efficient internetworking among end users with dedicated optical channels, thus enabling guaranteed bandwidth and enhanced security at the physical layer. On the other hand, to fit the development trend of service diversity, PONs need to efficiently support diverse new service deliveries.To accelerate the development of PONs, my thesis focuses on the researches of the key technologies of all-optical VPN and novel service delivery as follows: All-optical VPN technologyWith rapid development, all-optical VPN in PON is attracting more and more interest from both industry and academia. In traditional single-stage PON, we employ orthogonal modulation formats with waveband-selective reflection to realize the all-optical VPN connecting different optical network units (ONUs). This scheme eliminates the complicated schedule induced by time-division multiplexing (TDM), or the extra equipments required by wavelength-division multiplexing (WDM) in previous approaches. In two-stage long-reach PON, we demonstrate the all-optical VPN faction, for the first time in the world, by using dynamic wavelength reflector. Orthogonal FSK/ASK modulation format is used to improve the scalability of the network. Furthermore we extend the all-optical VPN function to metro-access networks by employing WDM and orthogonal DPSK/ASK modulation format, to realize the all-optical private connections across different sub-PONs.Novel service delivery technologyWDM-PON is considered as the most popular solution to the next generation broadband access networks. However, the emerging novel services are raising new requirement to the access delivery technologies. To keep up with the pace of diverse services, PON has to provide flexible, convenient, stable and cost-effective delivery. We propose two novel service delivery technologies based on WDM-PON to provide fast-tunable multicast function and quadruple play service (QPS) delivery function, respectively. In the multicasting scheme, we use the hybrid modulation technology based on an integrated dual-drive Mach-Zehnder modulator (MZM) to generate a fast-tunable optical carrier for the multicast channel of each subscriber. In each ONU, remodulation technology eliminates the necessity of laser source to reduce the cost. The proposed WDM-PON enabling cost-effective and fast-tunable multicasting is a potential platform for the future broadband video-on-demand and high-definition TV (HDTV) service. In the QPS scheme, we demonstrate the QPS delivery with a single wavelength by sub-carrier modulations at different bias conditions of the modulators, combined with amplitude modulations. The result is considered as a promising candidate for the integration of the voice telecom access network, video broadcast access network, Internet access network and wireless access network, and a milestone in the development of multi-play network.