Itaru Nishioka

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– We consider hierarchical optical networks with different granularities of paths (wavelengths and wavebands). We introduce classification layers for routing models in these networks (separated and integrated routing, homogeneous and heterogeneous networks, online and offline routing). We also propose and analyze two heuristic routing and aggregation(More)
A Path Computation Element (PCE) may be required to perform dependent path computations. Dependent path computations are requests that need to be synchronized in order to meet specific objectives. An example of a dependent request would be a PCE computing a set of services that are required to be diverse (disjointed) from each other. When a PCE computes(More)
Interoperable wavelength path control was successfully demonstrated on a multi-vendor WSON testbed by utilizing GMPLS signaling extension with lambda-label. Data-plane connections over GMPLS wavelength paths were also confirmed in the testbed with an 880km-in-total network.
The backbone infrastructure for providing carrier-class services, such as a wavelength-switched optical network (WSON), usually involves equipment from multiple vendors. For intelligent path control in the WSON, it is highly desirable to introduce a unified generalized multiprotocol label switching (GMPLS) control plane, which is beneficial for reducing the(More)
This article describes the first multi-area multiprotocol label switching and generalized MPLS interoperability trial over a reconfigurable optical add/drop multiplexer and optical cross-connect network. The interoperability trial demonstrated the routing of label switched paths over a multi-area GMPLS controlled ROADM/OXC network and the control of(More)
We experimentally demonstrated wavelength path and transponder fault recovery in ROADM system with one-chip color/direction-independent add/drop multiplexers employing silicon photonic circuit. Fault recovery time of less than 50 ms was achieved for both fault cases.
We demonstrate highly resilient wavelength path recovery within 2.0 seconds from each of triple failures, and 2.0 seconds from simultaneous failures. It is achieved, at first time, by interoperable dynamic wavelength path control in multi-vendor optical WDM networks.