Ciena

About: Ciena is a company organization based out in Hanover, Maryland, United States. It is known for research contribution in the topics: Signal & Node (networking). The organization has 1259 authors who have published 1557 publications receiving 25989 citations.

Methods, devices and software for combining protection paths across a communications network

Abstract: In a mesh communications network, in which working and protection paths may be established, channels used to carry protection traffic between nodes are shared across multiple protection paths. Channels need only be shared if sharing does not adversely impact network usage. If working and protection paths become susceptible to single points of failure, channels need not be shared.

Transient and switching event stabilization of fiber optic transport systems

Abstract: A method and system for transient and switching stabilization of a fiber optic transport system. One or more data-bearing channels are coupled to an optical fiber. The data-bearing channels are distributed among a plurality of frequency sub-bands. A set of control channels is also coupled to the optical fiber. Each control channel includes a pair of signals at separate frequencies. There is at least one control channel in each of the plurality of frequency sub-bands. The pair of signals of a control channel are cross-polarized. Optical power in at least one of the plurality of sub-bands is measured. Responsive to the measured optical power, the optical power of a control channel is adjusted to maintain a substantially constant power of a sub-band that contains the adjusted control channel.

Photonic routing systems and methods for loop avoidance

Abstract: A photonic network includes a plurality of nodes each supporting add and drop of at least Y wavelengths, a plurality of optical links interconnecting the plurality of nodes, the plurality of optical links support up to X wavelengths and Y≦X, an optical routing protocol configured to compute a loop-free path through the plurality of nodes on the plurality of links, the loop-free path is computed for one of the X wavelengths or a group of the X wavelengths using routing constructs adapted to a photonic domain, and optical components at each of the plurality of nodes configured to selectively block at least one of the X wavelengths based on the computed loop-free path. A photonic routing method and photonic node are also disclosed.

Make before break optical mesh network element

Abstract: A network element includes an electronic switch for routing traffic between a plurality of client access ports and a plurality of EO ports, a respective EO interface coupled to each one of the plurality of EO ports; a wavelength selective switch for optically switching optical signals between the EO interfaces and a set of optical transmission fibers; and a control system. The plurality of EO interfaces includes at least one Make Before Break (MBB) EO interface. The control system is operative to reconfigure the network element by identifying an EO interface to be reconfigured. A new optical path is set up through the wavelength selective switch and terminated on the MBB EO interface. The electronic switch is then controlled to re-route a traffic flow traversing the identified EO interface to the MBB EO interface.

Systems and methods for flow mirroring with network-scoped connection-oriented sink

Abstract: Systems and methods for sinking port mirrored data to any node in a network are provided. Moreover, the network is configured to convey the mirrored data to the sink, without the need for any facilities expressly dedicated for this purpose. The present invention removes the requirement to collocate the sink port within the same logical node. The present invention uses a mirrored flow configured as a provisioned layer two point-to-point connection, such as a Switched Permanent Virtual Circuit (SPVC), Pseudo-Wire (PWE3), a Virtual Local Area Network (VLAN) cross-connect, Provider Backbone Bridging-Traffic Engineering (PBB-TE), or the like. The provisioned point-to-point connection is configured between the mirrored port to a sink port. The node with the mirrored port is configured to create copies of the appropriate set of packets (i.e. ingress or egress packets or both based on provisioning), and to forward the packets to the sink port.