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1.发明专利
公开(公告)号：JP2001274755A
公开(公告)日：2001-10-05
申请号：JP2001051336
申请日：2001-02-27
Applicant: LUCENT TECHNOLOGIES INC
Inventor： DENKIN NATHAN MYRON , FEULNER MATTHIAS RICHARD , MA JIONG , WERNER DIETER , ZHU MING JUAN
IPC: H01S3/10 , H01S3/06 , H04B10/02 , H04B10/17 , H04B10/18 , H04B10/29 , H04J14/00 , H04J14/02 , H04B10/16
Abstract: PROBLEM TO BE SOLVED: To provide a system and a method for controlling reactions with respect to a power transient phenomenon in a wavelength division multiplex(WDM) network, whose signal is optically amplified during network reconfiguration or on the occurrence of a failure, when a WDM channel is added or deleted. SOLUTION: A variable band width filter circuit 500 is operated by a first prescribed band width for a first period τ0 to detect a change (power transient phenomenon) in a signal power caused by an event of a transient phenomenon and operated by a second specified band width narrower than the first prescribed band width for a period τ0+Δτ after the lapse of the first period to nearly suppress a low level signal change such as a remnant of the power transient phenomenon. Thus, the actual power transient phenomenon is maintained to start amplifier gain control based on the change in input power while the remnant is eliminated by preventing the remnant from being interpreted in mistake as an actual transient phenomenon event phenomenon.
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公开(公告)号：JP2001111151A
公开(公告)日：2001-04-20
申请号：JP2000249209
申请日：2000-08-21
Applicant: LUCENT TECHNOLOGIES INC
Inventor： FEULNER MATTHIAS RICHARD , HUNZIKER GUIDO HERMANN , TEICHMANN BERND , WERNER DIETER , ZHOU JIANHUI
Abstract: PROBLEM TO BE SOLVED: To provide a device and its method for keeping constant relatively a gain per channel of an optical channel in an optical amplification WDM system even when an input intensity of an optical amplifier changes. SOLUTION: A gain of an optical amplifier is controlled by controlling a pumping intensity amount to be supplied to the optical amplifier as a function of a change of an optical input intensity to be measured in a feed forward monitoring route. The pumping intensity amount is adjusted according to a proportional relationship with respect to the measured input intensity. The pumping intensity is directly controlled, so that the gain of the optical amplifier is controlled in a time scale of less than microsecond from a detection of a change of the input intensity. Furthermore, a gain per channel in the amplified WDM signal is kept relatively constant irrespective of the change of the input intensity of the optical amplifier, thereby reducing substantially an intensity deflection in an optical channel in which the WDM signal is left behind.
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公开(公告)号：DE60019212D1
公开(公告)日：2005-05-12
申请号：DE60019212
申请日：2000-08-14
Applicant: LUCENT TECHNOLOGIES INC
Inventor： FEULNER MATTHIAS RICHARD , HUNZIKER GUIDO HERMANN , TEICHMANN BERND , WERNER DIETER , ZHOU JIANHUI
IPC: H01S3/10 , H01S3/06 , H01S3/13 , H01S3/131 , H04B10/17 , H04B10/29 , H04J14/00 , H04J14/02 , H01S3/067 , H01Q1/24
Abstract: In an optically amplified wavelength division multiplexed (WDM) system having a WDM signal comprising a plurality of optical channels, the per-channel gain of the optical channels is kept relatively constant despite changes in input power at the optical amplifier (101), such as when individual optical channels of the WDM signal are added and dropped. More specifically, gain of an optical amplifier (101) is controlled by controlling the amount of pump power (110) supplied to the optical amplifier as a function of changes in input power which are measured in a feed-forward monitoring path (130, 140). The amount of pump power for effecting gain control is adjusted according to a scaled relationship to the measured input power of the optical amplifier. By controlling the pump power (by 120) directly in response to changes in input power, gain of the optical amplifier can be controlled within a sub-microsecond time scale from the time that a change in input power is detected. Moreover, by maintaining relatively constant per-channel gain in an amplified WDM signal despite changes in input power at the optical amplifier, power excursions are substantially reduced in surviving optical channels of the WDM signal, i.e., those at the output of the optical amplifier.
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公开(公告)号：CA2331954A1
公开(公告)日：2001-08-29
申请号：CA2331954
申请日：2001-01-22
Applicant: LUCENT TECHNOLOGIES INC
Inventor： WERNER DIETER , ZHU MINGJUAN , DENKIN NATHAN MYRON , FEULNER MATTHIAS RICHARD , MA JIONG
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 io 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 + .DELTA.t, 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 base d 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.
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公开(公告)号：DE60001444D1
公开(公告)日：2003-03-27
申请号：DE60001444
申请日：2000-09-11
Applicant: LUCENT TECHNOLOGIES INC
Inventor： DENKIN NATHAN MYRON , FEULNER MATTHIAS RICHARD , MA JIONG , WERNER DIETER , ZHU MING JUAN
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 tau 0 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., tau 0 + INCREMENT tau , 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.
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Patent Agency Ranking
公开(公告)号：CA2315989A1
公开(公告)日：2001-02-25
申请号：CA2315989
申请日：2000-08-14
Applicant: LUCENT TECHNOLOGIES INC
Inventor： FEULNER MATTHIAS RICHARD , ZHOU JIANHUI , WERNER DIETER , HUNZIKER GUIDO HERMANN , TEICHMANN BERND
Abstract: In an optically amplified wavelength division multiplexed (WDM) system having a WDM signal comprising a plurality of optical channels, the per- channel gain of the optical channels is kept relatively constant despite changes in input power at the optical amplifier, such as when individual optical channels of the WDM signal are added and dropped. More specifically, gain of an optical amplifier is controlled by controlling the amount of pump power supplied to the optica l amplifier as a function of changes in input power which are measured in a feed-forward monitoring path. The amount of pump power for effecting gain control is adjusted according to a scaled relationship to the measured input power of t he optical amplifier. By controlling the pump power directly in response to changes in input power, gain of the optical amplifier can be controlled within a sub- microsecond time scale from the time that a change in input power is detected. Moreover, by maintaining relatively constant per-channel gain in an amplifi ed WDM signal despite changes in input power at the optical amplifier, pow er excursions are substantially reduced in surviving optical channels of the WD M signal, i.e., those at the output of the optical amplifier.
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公开(公告)号：CA2331954C
公开(公告)日：2006-10-31
申请号：CA2331954
申请日：2001-01-22
Applicant: LUCENT TECHNOLOGIES INC
Inventor： FEULNER MATTHIAS RICHARD , DENKIN NATHAN MYRON , MA JIONG , WERNER DIETER , ZHU MINGJUAN
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 io 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., .TAU.0 + .DELTA..TAU. 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 base d 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.
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公开(公告)号：DE60019212T2
公开(公告)日：2006-03-09
申请号：DE60019212
申请日：2000-08-14
Applicant: LUCENT TECHNOLOGIES INC
Inventor： FEULNER MATTHIAS RICHARD , HUNZIKER GUIDO HERMANN , TEICHMANN BERND , WERNER DIETER , ZHOU JIANHUI
IPC: H01S3/10 , H01Q1/24 , H01S3/06 , H01S3/067 , H01S3/13 , H01S3/131 , H04B10/17 , H04B10/29 , H04J14/00 , H04J14/02
Abstract: In an optically amplified wavelength division multiplexed (WDM) system having a WDM signal comprising a plurality of optical channels, the per-channel gain of the optical channels is kept relatively constant despite changes in input power at the optical amplifier (101), such as when individual optical channels of the WDM signal are added and dropped. More specifically, gain of an optical amplifier (101) is controlled by controlling the amount of pump power (110) supplied to the optical amplifier as a function of changes in input power which are measured in a feed-forward monitoring path (130, 140). The amount of pump power for effecting gain control is adjusted according to a scaled relationship to the measured input power of the optical amplifier. By controlling the pump power (by 120) directly in response to changes in input power, gain of the optical amplifier can be controlled within a sub-microsecond time scale from the time that a change in input power is detected. Moreover, by maintaining relatively constant per-channel gain in an amplified WDM signal despite changes in input power at the optical amplifier, power excursions are substantially reduced in surviving optical channels of the WDM signal, i.e., those at the output of the optical amplifier.
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公开(公告)号：CA2315989C
公开(公告)日：2004-10-05
申请号：CA2315989
申请日：2000-08-14
Applicant: LUCENT TECHNOLOGIES INC
Inventor： HUNZIKER GUIDO HERMANN , FEULNER MATTHIAS RICHARD , ZHOU JIANHUI , WERNER DIETER , TEICHMANN BERND
Abstract: In an optically amplified wavelength division multiplexed (WDM) system having a WDM signal comprising a plurality of optical channels, the per- channel gain of the optical channels is kept relatively constant despite changes in input power at the optical amplifier, such as when individual optical channels of the WDM signal are added and dropped. More specifically, gain of an optical amplifier is controlled by controlling the amount of pump power supplied to the optica l amplifier as a function of changes in input power which are measured in a fe ed- forward monitoring path. The amount of pump power for effecting gain control is adjusted according to a scaled relationship to the measured input power of t he optical amplifier. By controlling the pump power directly in response to changes in input power, gain of the optical amplifier can be controlled within a sub- microsecond time scale from the time that a change in input power is detecte d. Moreover, by maintaining relatively constant per-channel gain in an amplifi ed WDM signal despite changes in input power at the optical amplifier, pow er excursions are substantially reduced in surviving optical channels of the WD M signal, i.e., those at the output of the optical amplifier.
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公开(公告)号：DE60001444T2
公开(公告)日：2003-11-20
申请号：DE60001444
申请日：2000-09-11
Applicant: LUCENT TECHNOLOGIES INC
Inventor： DENKIN NATHAN MYRON , FEULNER MATTHIAS RICHARD , MA JIONG , WERNER DIETER , ZHU MING JUAN
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 tau 0 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., tau 0 + INCREMENT tau , 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.
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