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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：JP2001086099A
公开(公告)日：2001-03-30
申请号：JP2000239938
申请日：2000-08-08
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LUMISH STANANK , HUNZIKER GUID HERMANN , ZHOU JIANHUI
Abstract: PROBLEM TO BE SOLVED: To use a transmitter which is designed to operate in a certain signal band also in another signal band by combining an outputted optical signal with a generated optical signal and transmitting the generated optical signal, having a wavelength included in the 2nd band width and corresponding to the wavelength of an optical signal included in the 1st band width to an optical transmission path. SOLUTION: A coupler 15 combines the output of a laser pump 10 with an input synthesized signal, which is produced from an optical signal included in a 1st band and sends the resultant signal to an optical amplifier 20. The amplifier 20 amplifies the signals, which are combined together by a prescribed amplification coefficient and sends the amplified signals to a wavelength converter 25. The converter 25 outputs an optical signal of a 1st band, a corresponding signal of a 2nd band and a laser pumping signal. An optical signal filter 30 transmits the signals, outputs the optical signal in the 2nd band and blocks the original optical signal of the 1st band and the laser pumping signal.
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公开(公告)号：JP2000277834A
公开(公告)日：2000-10-06
申请号：JP2000063059
申请日：2000-03-08
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BERGER MATTHIAS , BODE DIRK , FISHMAN DANIEL A , LIVESCU GABRIELA , RAABE CHRISTIAN , SHEHADEH FATIMAH , ZHOU JIANHUI , ZIRNGIBL MARTIN
IPC: G02F1/35 , H01S3/06 , H01S3/10 , H01S3/30 , H04B10/02 , H04B10/17 , H04B10/18 , H04B10/29 , H04J14/00 , H04J14/02 , H04B10/16
Abstract: PROBLEM TO BE SOLVED: To compensate for Raman effect by producing a gain inclined against Raman inclination in advance and applying the inclined gain to the spectrum of optical signals transmitted through an optical fiber. SOLUTION: A gain inclined against Raman inclination in advance is produced and the inclined gain is applied to the spectrum of optical signals transmitted through an optical fiber. For example, when an optical signal is transmitted from the output of an optical amplifier 100-i, e.g. 100-1, the gain is inclined at the low end of spectrum. Then a receiving optical amplifier, for example, an amplifier 100-2 amplifies a received signal and processes it again so that the power level of the optical signal is preliminarily inclined against Raman inclination produced in a transmitted light transmission line. With this constitution Raman effect can be offset.
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公开(公告)号：JPH10242917A
公开(公告)日：1998-09-11
申请号：JP2892898
申请日：1998-02-10
Applicant: LUCENT TECHNOLOGIES INC
Inventor： SRIVASTAVA ATUL KUMAR , SULHOFF JAMES W , SUN YAN , ZHOU JIANHUI , ZYSKIND JOHN LEHRER
Abstract: PROBLEM TO BE SOLVED: To provide an amplifier having a flat gain spectrum in a wide input dynamic range. SOLUTION: The optical signal amplifier 100 receives an optical signal formed from plural optical signals having respectively different wavelength through input means 130, 5 and the received signal is amplified by input amplification stages 10, 15 and the level of the amplifier input signal is controlled to a prescribed level by an attenuation unit 30. The amplifier 100 provided with a filter 35 substentially reduces its wavelength dependency, amplifiers the controlled signal by output amplification stages 40, 45 and supplies an amplified signal to output means 50, 130. The unit 30 attenuates the amplified optical signal as a function of respective wavelength values.
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公开(公告)号：JP2000353841A
公开(公告)日：2000-12-19
申请号：JP2000123009
申请日：2000-04-24
Applicant: LUCENT TECHNOLOGIES INC
Inventor： ACKERMAN DAVID ALAN , BERGER MATTHIAS , ZHOU JIANHUI
IPC: G02F1/03 , H01S3/06 , H01S3/10 , H01S5/026 , H01S5/0687 , H04B10/00 , H04B10/02 , H04B10/04 , H04B10/06 , H04B10/079 , H04B10/08 , H04B10/14 , H04B10/17 , H04B10/29 , H04B10/293 , H04J14/00 , H04J14/02 , H04B10/16
Abstract: PROBLEM TO BE SOLVED: To control frequency and output power independently by keeping the sum of the power level of an amplitude adjusted pilot tone signal and the power level of a received WDM optical signal constant independent of the number and amplitude of a wavelength included in the received WDM optical signal. SOLUTION: An input optical signal including a received WDM(wavelength division multiplex) optical signal and an amplitude adjusted optical pilot tone signal having a wavelength located outside the WDM signal is amplified. A wavelength stabilized laser 503 optical signal for use as a pilot tone signal is generated. The power level of a signal to be inputted to an optical amplifier 506 is compared with a reference signal and a control signal is generated. The amplitude of the received pilot signal is adjusted so that the sum of the power level thereof and the power level of the received WDM signal remains constant independent of the number and amplitude of the at least one wavelength included in the received WDM signal.
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Patent Agency Ranking
公开(公告)号：DE69828658T2
公开(公告)日：2006-04-27
申请号：DE69828658
申请日：1998-02-03
Applicant: LUCENT TECHNOLOGIES INC
Inventor： SRIVASTAVA ATUL KUMAR , SULHOFF JAMES W , SUN YAN , ZHOU JIANHUI , ZYSKIND JOHN LEHRER
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公开(公告)号：CA2315352A1
公开(公告)日：2001-02-10
申请号：CA2315352
申请日：2000-08-03
Applicant: LUCENT TECHNOLOGIES INC
Inventor： ZHOU JIANHUI , HUNZIKER GUIDO HERMANN , LUMISH STAN
Abstract: The number of optical channels that may be used to transmit information/data is greatly enhanced using an optical transmission facility having a transmitter that outputs optical signals having respective wavelengths within a first bandwidth, e.g., the C band, combines the latter signal with an optical signal having a wavelength between the first bandwidth and a second bandwidth, e.g., the L-band, and, using a non-linear frequency converter, processes the combined signal to form at least optical signals having wavelengths within the second bandwidth that correspond with the wavelengths of the optical signals within the first bandwidth. In this way, equipment designed for the C band may also be used to process optical signals with another, second band.
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公开(公告)号：AU4695199A
公开(公告)日：2000-01-05
申请号：AU4695199
申请日：1999-06-18
Applicant: LUCENT TECHNOLOGIES INC
Inventor： SRIVASTAVA ATUL KUMAR , SULHOF JAMES WILLIAM , SUN YAN , WOLF CHARLES L , ZHOU JIANHUI , ZYSKIND JOHN LEHRER
IPC: H01S3/06 , H01S3/067 , H01S3/094 , H01S3/10 , H04B10/291 , H04B10/294 , H04J14/02 , H04B10/17
Abstract: Gain tilt control in erbium-doped fiber amplifiers is realized by adjusting the attenuation of mid-stage variable attenuators situated between multiple stages of the erbium-doped fiber amplifier. Positive power tilt in input signals is compensated by increasing attenuator loss while negative power tilt is compensated by decreasing the attenuator loss.
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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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