A matrix M is used to determine groups of potential regenerator placements and obtain potential end-to-end optical paths by selecting desired sequences of regenerators. Then, a hierarchical guided search may be employed to efficiently select desired N-tuple disjoint optical paths from the potential optical paths. The hierarchical guided search may employ a search graph and a search tree to guide the search and to eliminate candidate nodes and optical paths early in the search process.

A technique is provided for provisioning optical connections in an optical network. The technique includes providing a plurality of connection demands, selecting working paths and provisioning working optical connections to satisfy all priority demands, selecting protection paths disjoint from the working paths and provisioning protection optical connections to satisfy all priority demands, computing a first virtual transparent topology consisting of a first remaining available capacity of the provisioned optical connections, selecting working paths within the virtual transparent topology and provisioning transparent tunnels satisfying all non-priority demands, selecting working paths and provisioning additional working optical connections to satisfy any remaining non-priority demands, computing a second virtual topology consisting of a second remaining available capacity, and selecting protection paths within the second transparent virtual topology and provisioning transparent tunnels to protect a non-priority demand using the second remaining capacity.

An embodiment method for managing connections on a communications network having an optical network portion includes receiving a request for a first connection at a controller in signal communication with one or more reconfigurable optical add-drop multiplexers (ROADMs) controlling an optical network portion of a communications network, wherein the controller is connected to the communications network. The controller determines a route on the communications network for the first connection according to conditions of the communications network, with the route comprising one or more first links of the optical network. The controller determines one or more first ROADMs controlling the one or more first links and sends commands from the controller to the one or more first ROADMs to allocate bandwidth on the one or more first links.

A method of setting up an end-to end connection between two end-points in an optical network. A plurality of validated paths in the network are defined. Each validated path extends between a respective pair of wavelength termination points and has requisite physical resources to carry signal traffic between its pair of wavelength termination points. A graph of the network is generated. An edge of the graph corresponds with a respective validated path, and a vertex of the of the graph corresponds with at least one wavelength termination point. The graph is analyzed to compute an end-to-end path between two vertices respectively corresponding with end-points of the end-to-end connection, and the end-to-end connection set up using the computed path.

The station-side terminal apparatus for the optical access network includes: the station-side terminal apparatus; the subscriber-side terminal apparatuses connected to the station-side terminal apparatus via the optical transmission line; the terminal devices to which mutually different wavelengths are assigned; and the communication failure detecting unit. Each of the terminal devices includes the uplink communication state monitoring unit configured to monitor a state of uplink communication for each registered subscriber-side terminal apparatus, on the basis of the input uplink signal, and the downlink communication failure information extracting unit configured to extract information of a state of downlink communication, which is transmitted from the registered subscriber-side terminal apparatus. The communication failure detecting unit detects a failure of the uplink communication and a failure of the downlink communication, on the basis of the state of the uplink communication and the state of the downlink communication.

A computer-implemented method to increase capacity of an optical network based on overall excess margin in the optical network includes determining an objective function based on data associated with a plurality of optical signals in the optical network, each of the optical signals between modems in the optical network, wherein an input to the objective function comprises how much margin the optical signals have until Forward Error Correction (FEC) limits are reached; performing an optimization of the objective function based on changing a plurality of parameters of the optical signals; and causing changes to settings of a subset of the modems based on the performing to change the capacity of the optical network.

Dynamic restoration involves routing and bandwidth assignment of an unplanned restoration path in a wavelength switched optical network (20), having regeneration nodes (60), nodes each having a ROADM (62) having drop paths and add paths. An electrical switch (68) provides configurable regeneration capacity by coupling selected drop paths to selected add paths. Some of the configurable regeneration capacity is kept for unplanned restoration paths. A PCE determines (120) routing and bandwidth assignments for an unplanned restoration path for the traffic flow to avoid a fault, and sends (130) configuration messages to the nodes to set up the unplanned restoration path dynamically and to configure the electrical switch to provide regeneration on the path. Keeping some reconfigurable regeneration capacity enables much longer unplanned paths to be found to avoid faults, and enables wavelength conversion if needed. Thus the reliability of finding at least one path avoiding the fault can be increased.

Aspects of the subject disclosure may include, for example, predicting dense wavelength division multiplexing (DWDM) path outage prediction and recommendation of alternate communication paths. Parameterized DWDM signals are launched, and resulting network characteristics are determined. The parameters and characteristics are used to train one or more machine learning models subsequently used to predict outages and recommend alternate paths. Other embodiments are disclosed.

The demand acquisition unit acquires the path demand indicating a start point and an end point of communication and a required communication capacity. The graph generation unit generates an auxiliary graph in which a plurality of nodes are connected by an existing edge and a new edge. In the auxiliary graph, the transmission scheme and the frequency of the wavelength path and the weight are set for each edge. The search unit searches for a route indicated by the path demand for the auxiliary graph on the basis of the weight. The design unit sets a wavelength path in the optical communication path by the transmission scheme related to the new edge included in the searched route, and accommodates the path demand in the wavelength path at a frequency related to each edge included in the route.

A system and method are disclosed to at least reduce a risk to optical network transmission performance presented by transient events, by developing and implementing provisioning instructions for routing resources in the optical network in a manner configured to reduce such risk. The system and method may selectively bias an optical channel provisioning process to preferentially select optical network configurations leading to improved transient resilience of the optical network. As a result, the optical network for example may route at least one optical channel through a specific connection path based at least in part upon the provisioning instructions. These provisioning instructions may be determined, for example, based at least in part upon a service request for transmitting resources in the at least one optical channel between two nodes and information relating to a configuration and capabilities of the at least one optical channel.