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.

Faceplate electrostatic discharge attenuating waveguide

Abstract: Faceplate, energy-attenuating, waveguide extensions are provided for use with an optical communications module having a circuit board. The circuit board has a plurality of transceivers adjacent to corresponding openings in a front portion of a faceplate, outside a protective zone of a Faraday cage created by the faceplate and adjacent modules, exposing the transceivers to electrostatic discharge (ESD), electromagnetic interference (EMI) or other destructive energy created by the faceplate openings. To attenuate the ESD, EMI, or other energy emanating through the faceplate openings, an integral, waveguiding, snout-like extension (or protrusion) is provided around the periphery of each of the faceplate openings. A removable waveguide extension to the snout-like extension may also be provided to further attenuate ESD, EMI or other energy. The longer the waveguide created by the combined removable extension and the integral snout-like extension, the greater the ESD, EMI, or other energy attenuation. The waveguide extension is removable so that the transceivers on the circuit board are accessible. If a connection is to be established between a male fiber connector and a female connector provided within the transceiver, the removable waveguide extension can be slid over the male connector before the connection is made. After the connection is established, the removable waveguide extension may then be slid down over the snout-like waveguide extension. The removable waveguide extension may also be provided with a conductive gasket to improve the electrical connectivity between the removable waveguide extension and the faceplate and thereby provide a more integral and sound Faraday cage for the circuit board transceivers.

Protection systems and methods for handling multiple faults and isolated nodes in interconnected ring networks

Abstract: The present disclosure provides protection systems and methods that provide a mechanism to identify/determine when an interconnection node has been isolated (i.e. when there is no connectivity between a pair of interconnection nodes), from a data path perspective. If/when this condition exists, actions are triggered on the subtending sub-ring that essentially perform a protection switch (which causes the subtending sub-ring nodes to cleanse their forwarding tables), and, more importantly, that remove any channel blocks on the subtending sub-ring. Extensions to the ITU-T G.8032 state machine are also provided that include support for operator command interactions (e.g. DNR, force switch, manual switch, etc.). The protection systems and methods of the present disclosure enable the reliable application of ITU-T G.8032 and the like to more complex (i.e. meshed) deployment environments, among other significant advantages.

Coordinated connection validation systems and methods among mated transceivers for verifying optical and data plane connectivity

Abstract: Systems and methods for connection validation between a pair of mated transceivers implemented in a network element include, responsive to a request for connection validation at a first transceiver of the pair of mated transceivers, performing a first optical loopback test through the first transceiver with a unique trace identifier; responsive to a successful first optical loopback test, providing the unique trace identifier to a second transceiver of the mated transceivers with a request for a second optical loopback test; performing the second optical loopback test through the second transceiver with the unique trace identifier; and, responsive to a successful second optical loopback test, providing the unique trace identifier back to the first transceiver from the second transceiver.

Method and system for controlling amplifier power in an optical communications network having add/drop capability

Abstract: The invention includes a method for controlling amplifier output power in an optical communications network having channel add/drop capability. A first transmission parameter and a second transmission parameter are determined at a first amplifier. In an exemplary embodiment, the first transmission parameter is a composite express signal-to-noise ratio and the second transmission parameter is a composite signal-to-noise ratio. The total output power of a downstream amplifier is adjusted in response to the first transmission parameter and second transmission parameter. A system for implementing the method is also disclosed.

Optical service channel systems and methods over high loss links

Abstract: Optical service channel (OSC) systems and methods over high loss links are described utilizing redundant telemetry channels. A first telemetry channel provides a low bandwidth communication channel used when Raman amplification is unavailable on a high loss link for supporting a subset of operations, administration, maintenance, and provisioning (OAM&P) communication. A second telemetry channel provides a high bandwidth communication channel for when Raman amplification is available to support full OAM&P communication. The first and second telemetry operate cooperatively ensuring nodal OAM&P communication over high loss links (e.g., 50 dB) regardless of operational status of Raman amplification.