Ciena Corporation

Mohammad Mehdi Mansouri Rad

Loren Berg

David W Boertjes

Choudhury A Al Sayeed

Jean-Luc Archambault

David Casson Bownass

Dave C Bownass

A method of analysing performance of an optical fiber link. As a preliminary step, a reference trace indicative of a distributed optical performance of the optical fiber link is derived. During in-service operation of the optical fiber link, an Optical Time Domain Reflectometry (OTDR) sub-system measures an OTDR trace with Raman amplification ON, and a real-time cumulative Raman Gain profile of the optical fiber link is calculated based on the reference trace and the measured OTDR trace.

Live monitoring of raman and fiber degradation in DWDM networks using in-service OTDR

A method, a controller, and an optical section include performing an analysis to determine an amount of power offset on any in-service channels in an optical section due to a capacity change with a channel; defining a step size to ensure the capacity change does not exceed an offset limit based on the analysis; performing the capacity change in one or more iterations using the step size to limit the capacity change; and performing an optimization between each of the one or more iterations to adjust amplifier gains in the optical section to compensate for offsets on the in-service channels caused by a previous iteration.

Systems and methods for capacity changes in DWDM networks including flexible spectrum systems

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Ottawa, Canada

Mohammad Mehdi Mansouri Rad