The invention provides a method for load-balanced traffic grooming in an IP over Quasi-CWDM network, including the steps of: inputting a network topology, a set of service traffics between nodes in node pairs and a null route, and when selecting one of the node pairs from the set of service traffics and establishing a traffic request between the nodes in the node pair, deleting the virtual link for which the corresponding light path has no sufficient remnant capacity in an IP layer of the network; finding the virtual link route having the lowest hop count in the IP layer, and determining whether each virtual link on the route can satisfy the service request by means of traffic grooming; and if yes, adopting the traffic grooming strategy to satisfy the service request; and if not, adopting the wave plane based strategy to establish a light path to satisfy the service request.

A path computation engine, PCE, (100) for an optical communications network comprising a plurality of nodes and a plurality of links. The PCE comprises a processor and memory comprising instructions executable by the processor whereby the PCE is operative to: receive a request to configure a quantum key, Qkey, path from a first node to a second node in the optical communications network for a quantum key distribution, QKD, signal for a quantum key for a secure data transmission signal; calculate a feasible Qkey path from the first node to the second node that is logically different to a traffic path from the first node to the second node for the secure data transmission signal, wherein the Qkey path is feasible if an optical signal power originating from the secure data transmission signal within the Qkey path, caused by optical interference of the secure data transmission signal with the QKD signal, is below a predetermined threshold value; and generate a control signal comprising instructions arranged to configure said feasible Qkey path.

A passive optical network includes a central office providing subscriber signals; a fiber distribution hub including an optical power splitter and a termination field; and a drop terminal. Distribution fibers have first ends coupled to output ports of a drop terminal and second ends coupled to the termination field. A remote unit of a DAS is retrofitted to the network by routing a second feeder cable from a base station to the hub and coupling one the distribution fibers to the second feeder cable. The remote unit is plugged into the corresponding drop terminal port, for example, with a cable arrangement having a sealed wave division multiplexer.

A method includes: receiving a packet in an optical domain, the packet including a data payload and a routing header indicative of a routing sequence for the data payload; reading a first bit of the routing header to make a routing decision for the data payload; stripping the first bit of the routing header in the optical domain to generate an updated routing header; and routing the data payload and the updated routing header based on the routing decision.

Disclosed are a disaggregated data center resource management method and apparatus. A resource management method in a disaggregated data center includes receiving a resource allocation request from a client; generating allocated resource information about a computing resource and a memory resource which configure a virtual server in one rack of the data center according to the resource allocation request and optical path setting information for optical path connection of the computing resource and the memory resource; updating a resource management table for the computing resource and the memory resource; and transmitting a resource connection setting message including the allocated resource information and the optical path setting information to the computing resource and the memory resource.

This application provides example methods for establishing a service path in a transport network and example systems. One example method includes, obtaining, by an automatically switched optical network (ASON) first node, a service path computation result path. The service path includes the ASON first node, an ASON last node, and at least one first edge network node. The method also includes sending, by the ASON first node, a path establishment request message to a downstream node. The path establishment request message carries cross-connection configuration information of the ASON last node and the at least one first edge network node. The method further includes receiving, by the ASON first node, a path establishment response message of the downstream node. The path establishment response message indicates that cross-connection configuration for the ASON last node and the at least one first edge network node is complete.

This application discloses a flow entry generating method and apparatus. The method includes: receiving a service path establishment request, where the service path establishment request includes a constraint, a source device, and a target device; finding, in a data transmission network according to a cross-layer information model, a service path that meets the constraint and is from the source device to the target device, where the cross-layer information model is a model that describes, at a same layer, an overall topology relationship between an IP layer and an optical layer; and generating a respective corresponding flow entry for each forwarding device in the service path, and sending the flow entry to a corresponding forwarding device. This application can greatly reduce time complexity of computing the service path, and improve efficiency of computing the service path, thereby improving efficiency of generating a flow entry.

A network system for a data center is described in which a switch fabric may provide full mesh interconnectivity such that any servers may communicate packet data to any other of the servers using any of a number of parallel data paths. Moreover, according to the techniques described herein, edge-positioned access nodes, optical permutation devices and core switches of the switch fabric may be configured and arranged in a way such that the parallel data paths provide single L2/L3 hop, full mesh interconnections between any pairwise combination of the access nodes, even in massive data centers having tens of thousands of servers. The plurality of optical permutation devices permute communications across the optical ports based on wavelength so as to provide, in some cases, full-mesh optical connectivity between edge-facing ports and core-facing ports.

A path computation engine, PCE, (100) for an optical communications network comprising a plurality of nodes and a plurality of links. The PCE comprises a processor and memory comprising instructions executable by the processor whereby the PCE is operative to: receive a request to configure a quantum key, Qkey, path from a first node to a second node in the optical communications network for a quantum key distribution, QKD, signal for a quantum key for a secure data transmission signal; calculate a feasible Qkey path from the first node to the second node that is logically different to a traffic path from the first node to the second node for the secure data transmission signal, wherein the Qkey path is feasible if an optical signal power originating from the secure data transmission signal within the Qkey path, caused by optical interference of the secure data transmission signal with the QKD signal, is below a predetermined threshold value; and generate a control signal comprising instructions arranged to configure said feasible Qkey path.

The present disclosure generally discloses capabilities for supporting new network zones and associated services. The network zones and associated services may include a near-real-time (NRT) zone and associated NRT services, a real-time (RT) zone and associated RT services, or the like. The resilient network zones and associated resilient and non-resilient services may be configured to provide bounded latency guarantees for reliably supporting various types of applications (e.g., mobile fronthaul, cloud computing, Internet-of-Things (IoT), or the like). The network zones and associated services may be provided using a distance-constrained fiber and wavelength switching fabric design comprised of various network devices and using associated controllers, which may be configured to support service provisioning functions, service testing functions, wavelength switching functions, and so forth.