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.

Load balancing systems and methods of MAC learning in multi-slot architectures

Abstract: Line cards in a multi-slot network element utilize load balancing systems and methods for synchronizing learned Media Access Control (MAC) addresses therebetween. It is an objective of the load balancing systems and methods to enable high data rate scalability between line cards in a distributed system while preventing adverse effects on packet traffic. The load balancing systems and methods include inter alia MAC address updates between data path devices (e.g., network processors, application specific integrated circuits, etc.) using data frames and a hash-based time slot strategy ensuring MAC address updates are distributed over time as opposed to large scale, singular events.

A Low Noise, DC-135GHz MOS-HBT Distributed Amplifier for Receiver Applications

Abstract: A 5-stage distributed amplifier is reported in a 55nm SiGe BiCMOS process. The design, which employs a MOS- HBT cascode, was optimized for low-noise, 135GHz bandwidth and an input 1 dB compression point of 3.3 dBm, as needed in 200GS/sec ADCs for future generation 1Tb/s fiberoptic systems and instrumentation receivers. The measured gain is 8.5 dB, and the measured noise figure is less than 7 dB up to 88.5 GHz. Eye diagram measurements with PRBS-31 patterns were performed at up to 120 Gb/s, and a dynamic range of over 36 dB was demonstrated. The chip consumes 99 mW from a 3.3V supply and occupies 0.36x1mm2.

Calculating physical routes in a communication network

Abstract: A system operating on a communication network for mapping service-level information comprising logical connections to physical-level information comprising working physical paths of the logical connections, where the physical-level information is obscured by activation of protect schemes within the communication network.

Suppression of power transients in optically amplified links

Abstract: Exemplary embodiments of the invention are drawn to a method and apparatus for the suppression of power transients in optically amplified links. A fault is detected in a first optical signal propagating in a first direction. Upon detection of the fault, a second optical signal propagating in a second direction to the first direction can be switched so as to reverse second optical signal and to replace the at least a portion of first optical signal.

Wdm ring transmission system having reduced adjacent channel cross-talk

Abstract: A WDM ring configuration having reduced adjacent channel cross-talk is disclosed. In the WDM ring, an add/drop element having a filter for selecting an optical signal at a desired wavelength is spaced from another add/drop element having a filter adding an optical signal at an adjacent wavelength within a channel plan by at least one add/drop element that adds/drops an optical signal at a wavelength which is not next to either the optical signal at the desired wavelength or the adjacent wavelength.