Ciena Corporation

Song Cao

Jean-Luc Archambault

Na Young Kim

Choudhury A Al Sayeed

David Miedema

Paul Chedore

Laser safety shutoff or power reduction is disclosed for optically amplified fiber optic links with high transmission power. In an embodiment, a network element includes an amplifier configured to amplify one or more traffic carrying signals that are being transmitted over an optical fiber connected to the network element; a first receiver configured to receive a first monitoring signal that counter propagates over the optical fiber relative to the one or more traffic carrying signals; and circuitry configured to one or more of reduce power of the amplifier and shut off lasers associated with the amplifier, responsive to a loss of signal at the first receiver.

Laser safety shutoff or power reduction for optically amplified fiber optic links with high transmission power

Systems and methods are provided for creating a sequence of turn-up processes for amplifiers. A method, according to one implementation, includes determining when a fiber span is initially installed in an optical line system or when an Optical Line Failure (OLF) in the fiber span has recovered. The optical line system includes a first set of amplifiers deployed at an upstream node and a second set of amplifiers deployed at a downstream node, the upstream node connected to the downstream node via the fiber span. In response to determining that the fiber span is initially installed in the optical line system or that an ORL in the fiber span has recovered, the method also includes sending a flag from the upstream node to the downstream node to allow the first set of amplifiers to perform a first turn-up process before the second set of amplifiers perform a second turn-up process.

Turn-up procedure for local and remote amplifiers in an optical system

Systems and methods for characterizing an optical fiber performed in part by an optical node () in an optical line system () include performing one or more measurements to characterize the optical fiber () with one or more components () at the optical node (), wherein the one or more components () perform functions during operation of the optical node () and are reconfigured to perform the one or measurements independent of the functions; and configuring the optical node () for communication over the optical fiber () based on the one or more measurements. The one or more components can include any of an Optical Service Channel (OSC), an Optical Time Domain Reflectometer (OTDR), and an optical amplifier. The configuring can include setting a launch power into the optical fiber based on the one or more measurements.

Optical fiber characterization measurement systems and methods

Systems and methods for remotely turning on and turning up a Raman amplifier are provided. In one embodiment, a method includes the step of turning on one or more Raman pumps of a Raman amplifier to a predetermined safe gain or power level. The method also includes determining an estimated loss along a fiber optic span of a link between adjacent nodes of an optical network. Responsive to the estimated loss being greater than a reach of an Optical Supervisory Channel (OSC) signal along the link, the method includes the step of adjusting the gain or power level of the one or more Raman pumps.

Automatic remote node turn-up procedure using a raman amplifier on a stretched fiber span

Systems and methods for characterizing an optical fiber performed in part by an optical node in an optical line system include performing one or more measurements to characterize the optical fiber with one or more components at the optical node, wherein the one or more components perform functions during operation of the optical node and are reconfigured to perform the one or measurements independent of the functions; and configuring the optical node for communication over the optical fiber based on the one or more measurements. The one or more components can include any of an Optical Service Channel (OSC), an Optical Time Domain Reflectometer (OTDR), and an optical amplifier. The configuring can include setting a launch power into the optical fiber based on the one or more measurements.

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Kanata, Canada

Song Cao