Ciena Corporation

Rishi Malik

Mohit Chhillar

Anurag Prakash

Seemant Bisht

Dominic Richens

Parmita Kandiyal

Systems and methods include, responsive to a fault affecting an optical service on an active path in an optical network operating at a frequency &#x3bc;1 via an optical transceiver and having optical line protection via an optical protection switch, switching to an inactive path that now becomes the active path and finding a new route in the optical network for the inactive path that has the fault; responsive to being unable to find a route at the frequency &#x3bc;1, switching the inactive path to a new route at a different frequency &#x3bc;2; and implementing spectrum coordination relative to the inactive path to either determine the frequency &#x3bc;1 is available on the new route or to find another new route for the inactive path where the frequency &#x3bc;1 is available.

Spectrum coordination in optical line protection to minimize optical transceiver retuning

A service modification method includes, in a node which is part of a network controlled by a control plane, routing a connection off of its home path to a current path which is at least partially disjoint from the home path and creating a reservation for the connection on the home path such that the connection can revert thereto; signaling a modification of the connection while it is on the current path; and updating the reservation based on the modification including signaling the modification to all nodes on the home path. The service modification method can further include reverting the connection to the home path with the modification. The updating can fail due to an inability to support the modification on the home path, and the service modification method can further include periodically retrying the updating the reservation based on the modification.

Service synchronization in retain home path scenarios in a control plane network

Systems and methods for horizontal synchronization are implemented by a first node with a second node adjacent to the first node in a network with a control plane. The horizontal synchronization manages and corrects for a state of a service which is resizable. The systems and methods include providing a first horizontal synchronization message to the second node with a first state comprising the state of the service at the node and a first size comprising a size of the service at the node; receiving a second horizontal synchronization message from the second node with a second state comprising the state of the service at the second node and a second size comprising a size of the service at the second node; detecting a mismatch of the service with the second node based on the second horizontal synchronization message; and performing a recovery action to correct the mismatch.

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New Delhi, India

Rishi Malik