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We present a lab-trial of multi-domain path computation using a hierarchical PCE when domain topologies are aggregated as dynamic virtual meshes. We detail the extended path computation procedures, control plane extensions and the overall performance.
This paper demonstrates an implemented bandwidth management system for the QoS-assured network architecture. To provide a cost-effective priority service, service providers should utilize the bandwidth in the existing core network. Therefore, the system dynamically optimizes the resource allocation at the edge of the network considering current bandwidth usage along the path in the core network. In...
We present a lab-trial of lightpath provisioning for multi-area, OSNR-aware and GMPLS-enabled WSON combining BRPC for path optimality with Path Keys for topology confidentiality. We quantitatively show its feasibility and performance such as the setup delay.
Dynamic control to graft and prune optical point-to-multipoint trees was successfully demonstrated in a WSON testbed by utilizing GMPLS signaling extensions. By using wavelength selective switch with variable optical power split function, a power managed P2MP tree could be constructed.
Dynamic path computation and optimization is very challenging for emerging Multi-Layer Networks (MLN), typically Packet Optical Transport Networks (P-OTN). In this work, we propose to address a category of dynamic optimization problems in MLNs by using an M-concurrency path computation approach. By leveraging our previous work in single path computation solutions for MLNs, we design an efficient M-concurrency...
An automatic optical path diagnosis operation on our developed NMS was successfully demonstrated in an all-optical network testbed. Quality assessment and fault localization of transparent GMPLS-based optical paths could be automatically performed on a link-by-link basis.
Ethernet has become a prominent candidate for the infrastructure of an IP-based packet centric network infrastructure, providing not only for enterprise services that are virtual private networks but also for residential services that are FTTx and xDSL for triple play. To construct a service providerpsilas network by using layer two (L2) switches in the wide area network (WAN) certainly represents...
Applicability of linktrace and delay measurement functions of Ethernet OAM is investigated. We successfully demonstrate the monitoring scheme of logical topology and change of LAG configurations with the Ethernet OAM functionalities in the wide area network.
We validated the feasibility of fibre channel over MPLS technology. The fundamental evaluation as well as the statistical multiplexing of FC frame and Ethernet frame over MPLS network was successfully demonstrated for the first time.
We successfully demonstrated the management capability of VLAN-based wide area Ethernet network, which includes a resilient packet ring (RPR) by using an Ethernet OAM frame for the first time. Widely-deployed configurations in actual use, which include point-to-multipoint Ethernet virtual connection (EVC) with VLAN and point-to-point EVC such as the numbers of VLAN(s) are forwarded via the same data...
We propose a novel management scheme of guaranteed bandwidth in a packet switched network for QoS provisioning. Proactively controlled bandwidth assignment between four computing resources was successfully demonstrated.
Next generation IP/optical network is the fundamental infrastructure to provide the fixed and wireless broadband services. In this paper, access, metro and core network technologies to accommodate the various broadband services are presented
We report here a retrospective analysis of 36 children with therapy-related myelodysplastic syndrome (t-MDS) diagnosed between 1990 and 1999 in Japan. Their median age was 7.7 years and the median latency period for the development of t-MDS was 38.5 months. The primary tumors were hematologic in 15 of the cases and nonhematologic in 21. Chromosomal abnormalities were detected in 32/34(94%) patients:...
We have successfully demonstrated, for the first time, a bit-rate tunable all-optical regeneration at 10 Gbit/s, 40 Gbit/s and 80 Gbit/s by using the same SOA-based all-optical polarization switch utlizing one variable differential group delay generator.
Cross-phase and cross-absorption modulation in an EAM were quantitatively characterized for the first time. Drastic reduction in power penalty from 5 dB to 1.5 dB in 40 Gbit/s wavelength conversion was confirmed owing to blue-shift of the bandgap wavelength of the EAM
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