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AssigneeLucent Technologies Inc.
InventorsNathan Myron Denkin, Matthias Richard Feulner, Jiong Ma, Dieter Werner, Mingjuan Zhu
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An apparatus and method are described for controlling response to power transients in an optically amplified wavelength division multiplexed (WDM) network when WDM optical channels are added and dropped, during network reconfigurations, during failure events, and so on. In one embodiment, a variable bandwidth filter circuit operates at a first prescribed bandwidth during a first time period τ0 to detect a change in signal power (i.e., power transient) caused by a transient event, and operates at a second prescribed bandwidth that is less than the first prescribed bandwidth after the first period of time elapses, e.g., τ0+Δτ, to substantially suppress low level signal variations, such as remnants of the power transient. In this way, the power transient related to the actual transient event will be preserved to trigger control circuitry, e.g., amplifier gain control based on input power changes, while the remnants will be filtered out to prevent unwanted responses by the control circuitry, e.g., remnants misinterpreted as actual transient events.
An apparatus for controlling response to power transients in an optically amplified wavelength division multiplexed (WDM) ring network, the apparatus comprising:
The apparatus according to 13, wherein the flip-flop logic element is automatically reset following a delay determined by the delay element, wherein an amount of delay provided by the delay element is approximately less than the time associated with one round trip around the WDM ring network.
An apparatus for controlling response to power transients in an optically amplified wavelength division multiplexed (WDM) ring network, the apparatus comprising:
An optical amplifier for amplifying a wavelength division multiplexed (WDM) optical signal in a WDM ring network, the optical amplifier including a pump source and a pump control circuit for controlling an amount of pump power as a function of changes in optical signal power in the WDM optical signal, the optical amplifier comprising:
A method of controlling responses to power transients in an optically amplified wavelength division multiplexed (WDM) ring network, the method comprising:
A method of controlling responses to power transients in an optically amplified wavelength division multiplexed (WDM) ring network, the method comprising:
Dependencies are inferred from the claim text.