Ciena Corporation

Francisco Javier Vaquero-Caballero

Maurice M O'Sullivan

Michael Andrew Reimer

Andrew D Shiner

Kevin Stuart Farley

Michael Hubbard

Mohammad Ebrahim Mousa Pasandi

Seb Savory

David Ives

A communication system is configured to generate a perturbed signal by perturbing an amplitude of a spectrum of an original signal in one or more spectral regions, and to propagate the perturbed signal through components of the communication system. The communication system is further configured to obtain a measurement of the perturbed signal in a first spectral region of the one or more spectral regions following the propagation of the perturbed signal, and to calculate an estimate of an impairment associated with the communication system based on the measurement.

Estimation of communication system impairments using spectrally selective signal perturbations

A first signal is generated having a first frequency spectrum comprising one or more stopbands in which components of the first signal exhibit attenuated energy relative to an average energy of the first signal. A second signal is generated having a second frequency spectrum comprising non-zero energy at frequencies within the one or more stopbands. A third signal is generated by a crosstalk-inducing subsystem from a combination of the first signal and the second signal. The third signal is detected at a receiver device and an estimate of crosstalk induced by the crosstalk-inducing subsystem is calculated using a measurement of the third signal at the frequencies within the one or more stopbands. According to some examples, the second frequency spectrum comprises a tone within at least one of the stopbands.

Measurement of crosstalk

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Valladolid, Spain

Francisco Javier Vaquero-Caballero