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.

System and method for supporting virtualized links at an exterior network-to-network interface

Abstract: The present invention provides systems and methods for abstracting a network topology into virtual links and supporting both generic and instantiated virtualized links for linking a virtualized topology with actual resources within a domain, providing security over network topology information, providing control over the allocation of resources, and reducing the complexity of advertising.

Service enhancement discovery for connectivity traits and virtual network functions in network services

Abstract: Systems and methods for service enhancement discovery in a Software Defined Networking (SDN) network include obtaining network measurements for one or more candidate services in the network; utilizing the network measurements to determine one or more service enhancements for the one or more candidate services; determining a cost and a benefit for each of the service enhancements for the one or more candidate services; and providing the service enhancements for the one or more candidate services based on associated cost and associated benefit of each of the service enhancements.

Optical amplifier having substantially uniform spectral gain

Abstract: An optical amplifier is disclosed having substantially uniform spectral gain. The amplifier comprises a variable optical attenuator coupled between first and second segments of active optical fiber. The attenuation of the optical attenuator is adjusted in accordance with the optical power input to the amplifier to thereby obtain substantially flattened gain. Alternatively, the attenuator can be controlled based on the respective gains associated with the first and second segments of optical fiber. For example, the attenuator can be adjusted so that the sum of the two gains remains substantially constant, a condition that also yields flat spectral gain. Further, optical powers associated with first and second wavelengths of amplified stimulated emission (ASE) light output from the amplifier can be used to adjust the attenuation of the optical attenuator. In an additional example, received optical powers associated with each of the channels in a WDM system are monitored and the attenuators within each amplifier in the system are controlled so that the received powers are substantially equal.

Methods and systems for the hierarchical mesh restoration of connections in an automatically switched optical network

Abstract: The present disclosure describes methods and systems for the hierarchical mesh restoration of connections in an ASON or the like. These methods and systems provide a mesh restorable OTN server layer that carries an aggregate of mesh restorable SONET/SDH SNCs, without designating SONET/SDH/OTN hand-off ports or work/protect lines. Server layer SNCs are terminated on Virtual Trail Termination Points (VTTPs) on the NEs. These VTTPs maintain all of the attributes of physical Trail Termination Points (TTPs). The server routing protocol creates physical TTP interfaces at the server layer, and the server layer advertises bandwidth to the client layer routing protocol. A failure in the server layer results in the mesh restoration of an aggregate line, holding off the release of the individual client SNCs. Only when the server layer cannot restore are these individual client SNCs released.

Optimized 4 and 8 dimensional modulation formats for variable capacity in optical networks

Abstract: We present enhanced modulation formats optimized for nonlinear performance over a range of spectral efficiency. Maximum transmission distance is improved by > 600 km at PM-8QAM capacity and by > 3500 km at PM-BPSK rates.