A detailed management system implementation process for a realized reconfigurable optical add-drop multiplexer (ROADM) is presented. The ROADM is capable of freely adding/dropping any of 40 wavelengths within C-band at ITU_T standard spacing according to the user's configuration demand from the management system. SNMP and Java
language are used in the deployment of the management system. The management system framework and its implementation process are introduced in template-based form, so they are generic enough to be deployed in managing such reconfigurable elements in optical transport network, and be of value to others who are contemplating managing such kind of reconfigurable elements.
An algorithm is presented in this paper to implement Dynamic Bandwidth Allocation of Gigabit-capable Passive Optical Network(GPON) which is one of the key technologies in GPON, and simulation result is shown to demonstrate the algorithm’s performance.
High efficiency, long wavelengths InP/InGaAs resonant-cavity enhanced (RCE) Photodetector was fabricated. To circumvent the difficulty in achieving high reflective InP-based DBR, the Si/SiO2 DBR was evaporated as the bottom mirror of the cavity by using back illumination from the substrate. A quantum efficiency of 80% at 1.583um was achieved with an absorption layer thickness of only 0.2um. In addition, the Micro-pectinated Carrier-Collected Layer (MCCL) was fabricated by proton implantations, thus device capacitance can be reduced without decreasing of the illuminating area. The bandwidth was increased from 600MHz to 800MHz experimentally by formation of MCCL, without decreasing of the quantum efficiency.
The survivability of IP over WDM network gains importance as the volume of traffic to be transported by the network keeps growing. In this article we investigate the restoration schemes for handling dynamic traffic demand failures in IP/MPLS over WDM networks. We classify the various restoration schemes into two broad categories: recovery at the lowest layer and recovery at the highest layer. Six specific restoration schemes will be introduced and analyzed. Simulation will be performed to compare the network utilization of the six restoration schemes.
It is believed that on-demand dynamic lightpath provisioning will enable service providers to respond quickly and economically to customer demands. One of the challenges involved in designing wavelength-routed networks with dynamic traffic demands is to develop efficient algorithms and protocols for establishing lightpaths. This paper proposes a novel dynamic path-selection algorithm that combines service path link using probability weight with efficient disjoint-path restoration bandwidth sharing to obtain a balanceable traffic distribution during the wavelength route selection, and consider the wavelength bandwidth capability sharing between the disjoint paths for the failure scenario. At the same time, to realize dynamic lightpath establishment, this paper discusses the strategy of lightpath establishment based on Automatically Switched Optical Network (ASON), and also presents the extension of GMIPLS protocols to efficiently collect and distribute the necessary information in ASON architecture frame. Through the distributed IP-centric protocol we can realize link state update and dissemination. To sum up, in this paper we hope to show a full and efficient dynamic path establishment mechanism with ASON control plane function and GMPLS principle.