The present application provides a wavelength configuration method for a multi-wavelength passive optical network, which includes: scanning, by an ONU, a downstream receiving wavelength, and receiving, downstream wavelength information of each downstream wavelength channel that is broadcast by an OLT separately through each downstream wavelength channel of a multi-wavelength PON system; establishing, by the ONU, a downstream receiving wavelength mapping table, where an entry of the downstream receiving wavelength mapping table includes downstream receiving wavelength information, drive current information of a downstream optical receiver and receiving optical physical parameter information of the ONU; selecting, by the ONU, one downstream wavelength from the downstream wavelength information broadcast by the OLT, and setting, according to the drive current information of the downstream optical receiver recorded in a related entry of the downstream receiving wavelength mapping table, an operating wavelength of the downstream optical receiver to the selected downstream wavelength.

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.

Methods and systems for optical path computation based on a reachability matrix may rely on matrix multiplication to determine a number and respective network locations of regenerators for establishing an end-to-end reachable path in an optical network between a source node and a destination node. The reachability matrix may specify directly reachable optical paths between nodes in the optical network.

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.

In one embodiment, a method of photonic frame scheduling includes receiving, by a photonic switching fabric from a top of rack (TOR) switch, a frame request requesting a time slot for switching an optical frame to an output port of a photonic switch of the photonic switching fabric and determining whether the output port of the photonic switch is available during the time slot, and generating a contention signal including a grant or a rejection, in accordance with the determining. Also, the method includes assigning the time slot to the TOR switch for the output port of the photonic switch, when the contention signal includes the grant, transmitting, by the photonic switching fabric to the TOR switch, the contention signal and receiving, by the photonic switching fabric from the TOR switch, the optical frame during the time slot, when the contention signal includes the grant.

The present disclosure provides dynamic performance monitoring systems and methods for optical networks to ascertain optical network health in a flexible and accurate manner. The present invention introduces accurate estimations for optical channel performance characteristics based either on existing channels or with a dynamic optical probe configured to measure characteristics on unequipped wavelengths. Advantageously, the dynamic performance monitoring systems and methods introduce the ability to determine physical layer viability in addition to logical layer viability.

Described herein are techniques for routing communications to a destination node within a LEO satellite network. The techniques may comprise receiving, at a satellite node in a network of satellites, a communication directed to an address for a destination satellite, determining whether the satellite node is the destination satellite, upon determining that the satellite node is the destination satellite, transmitting the communication to a ground station in communication range of the satellite node, and upon determining that the satellite node is not the destination satellite: identifying, via a local routing table, a second satellite node associated with the address for the destination satellite, and forwarding the communication to the second satellite node.

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.