Chenwei Wu

A reliable WDM optical access network enabling dynamic wavelength allocation and triple-play service

A reliable dual-fiber ring-tree wavelength-division multiplexing optical access network architecture is proposed in this paper. On the one hand, due to the use of differential phase shift keying modulation, triple-play service including point-to-point service and broadcast service is realized. On the other hand, the wavelengths can be allocated dynamically by means of the special design of the remote node. What is more important is this network architecture can provide flexible protection modes for either single or multiple failures as well. The network survivability could be improved largely.

High-reliable WDM access network based on alternate transmission mode featuring power optimization and network stability

A ring-based wavelength division multiplexing access network is presented in this paper. By introducing a novel alternate transmission mode, the network can optimize the optical power received by each node. By using ring topology, the central office can provide full protection in the case of both single- and double-fiber failure. It can make the number of affected RNs more predictable. And the system oscillation caused by failure can also be controlled in a stable range. By simulation, the mentioned functions are demonstrated. The simulating results show the network has good performance.

Novel ring-based WDM-PON architecture with high-reliable remote nodes

A self-healing WDM-PON access ring architecture with high-reliable remote nodes is proposed and demonstrated in this paper. Four protecting modes are designed for protection of different fiber failures. The protecting fiber of the central ring can provide protection for working fiber. Optical line terminal and remote nodes can automatically switch to protecting fiber when working fiber fails. Network scale and system reliability are also analyzed at the end of this paper.

Highly reliable wavelength-reuse wavelength-division multiplexing semipassive optical access network architecture with double cover area and high network capacity

We propose a wavelength-reuse wavelength-division multiplexing semipassive optical access network architecture with ring topology. Two access rings are controlled by one central office. The system capacity, as well as the network cover area, can be doubled with this proposal. When fiber failure occurs, the corresponding switches in remote nodes change to protection state to restore the network communication. Copyright

Establishment and Performance Analysis of General Structural Models of Single-fiber Bidirectional WDM-PON with Star Topology and Ring Topology

Abstract In this paper, the general structural models of single-fiber bidirectional wavelength division multiplexing passive optical network with star topology and ring topology are proposed. The performances of the two general structural models including network scale, construction cost and system reliability, are analyzed and compared numerically. In particular, link failure and node failure are considered as two different types of failures and discussed separately in the context. The characteristics of the two models, which are concluded in the end of this paper, can be the guide in the deployment of WDM-PON.

Dynamic bandwidth allocation with optimized excess bandwidth distribution and wavelength assignment in multi-wavelength access network

Dynamic bandwidth allocation (DBA) is of great importance and interest to multichannel passive optical networks (PON). It plays a crucial role in efficiently and fairly allocating the bandwidth among all users. In this paper, we proposed an optimized excess bandwidth distribution algorithm. The excess distribution quota obtained from the algorithm can be adjusted adaptively and can further augment the efficiency and fairness of DBA. The proposed algorithm can effectively prevent excess distribution from bandwidth monopolization and over-allocation. Besides, we formulate a wavelength assignment scheme to eliminate the idle period and increase the bandwidth utilization of the network. Finally, we conduct detailed simulation experiments to research and analyze the performance and demonstrate the effectiveness of the proposed scheme.

Novel structure of optical access network based on cycle shift method

By using cycle shift method, a novel architecture of optical access network is proposed. It can not only achieve the carrier tri-reuse but also provide protection for distribution fibers. By taking cycle service mode, one carrier can respectively provide services for three different optical network units at the same time. And, by utilizing the cycle characteristic of 2*N Arrayed Waveguide Grating in the remote node, it can provide an automatic recovery from distribution fiber failure. Simulation and analysis show the proposed scheme achieves over functions.