Jiong J Ma

US Patent:

6356386, Mar 12, 2002

Filed:

Feb 29, 2000

Appl. No.:

09/515906

Inventors:

Nathan Myron Denkin - Aberdeen NJ
Matthias Richard Feulner - Nuremberg, DE
Jiong Ma - Tinton Falls NJ
Dieter Werner - Neunkirchen am Brand, DE
Mingjuan Zhu - Edison NJ

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

H01S 300

US Classification:

359337, 3593414, 359124

Abstract:

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 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. , + , 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.