Ciena Corporation

Nortel Networks Corporation

Joanne Wakefield

David Casson Bownass

Choudhury A Al Sayeed

Edward Chen

Maurice M O'Sullivan

Jonathan Paul King

David R Doucet

Douglas W Charlton

Charles Hubbard

Gregory Moffatt

Thomas Coleman

Mark Riley

Systems and methods for resolving control conflicts in trunk protection links are provided. A head-end node includes a first line-mux controller and a second line-mux controller, first actuator components for a first fiber span, and second actuator components for a second fiber span, wherein the first line-mux controller and the second line-mux controller are configured to control the first actuator components and the second actuator components, respectively, and a trunk protection switch configured to connect an input to each of the first fiber span and the second fiber span.

Resolving control conflicts among trunk protection links

Systems and methods for resolving control conflicts in trunk protection links are provided. A method, in one implementation, includes identifying control conflicts among Network Elements (NEs) in an Optical Multiplex Section (OMS). The OMS may have a plurality of trunk protection links arranged in parallel and a plurality of Trunk Protection Switches (TPSs). Also, the trunk protection links and TPSs are configured to create a distributed 1:N trunk protection arrangement. The method also includes resolving the control conflicts by auto-negotiating a primary instance associated with enabling a first set of control actions to be conducted along a primary path in the OMS and auto-negotiating one or more follower instances associated with enabling a second set of control actions to be conducted along one or more secondary paths in the OMS subsequent to the first set of control actions.

Systems and methods using a polarimetric measurement device to localize a source of one or more State of Polarization (SOP) transients affecting one or more optical fibers are disclosed. The method includes transmitting a signal into a fiber in a first direction; receiving, at the polarimetric measurement device, the signal from one of the fiber and another fiber collocated in a bundle with the fiber in a second direction; and processing data from the polarimetric measurement device to determine a location of the one or more SOP transients. The processing can include detecting a presence of the one or more SOP transients based on a first signature and its echo seen in the data; and converting a time between the echoes into a distance.

Systems and methods using a polarimeter to localize state of polarization transients on optical fibers

A computerized method for modifying an optical wavelength division multiplexing (WDM) network is described. The method includes providing an initial configuration of the optical WDM network. At least one parameter that represents a characteristic of a span in the optical WDM network as defined by the initial configuration is evaluated. The initial configuration of the optical WDM network is modified in response to the evaluation. The method can also include determining if a predetermined set of engineering rules are satisfied.

System and method for automated engineering of optical networks

A pulse interleaver splits an input pulse train into at least two optical branches ( ). A first one of the branches ( ) carries a first signal, and is terminated with a mirror ( ) and a device ( ) for manipulating the state of polarization. The reflected signal is re-combined at a combiner ( ) with a second signal on a second one of the branches ( ). The effective path lengths for the first and second signals between the input and the combiner are selected such that the input pulse train is interleaved with itself thereby providing an output with increased frequency. The mirror ( ) and the device for manipulating the state of polarization ( ) provide a predetermined relationship between the polarization of pulses in the output pulse train derived from an individual pulse of the input pulse train.

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Ottawa, Canada

Joanne Wakefield