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    13.
    发明专利
    未知

    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.

    CHANNEL BAND CONVERSION APPARATUS FOR OPTICAL TRANSMISSION SYSTEMS
    14.
    发明专利
    CHANNEL BAND CONVERSION APPARATUS FOR OPTICAL TRANSMISSION SYSTEMS 未知

    公开(公告)号：CA2315352C

    公开(公告)日：2004-03-02

    申请号：CA2315352

    申请日：2000-08-03

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： LUMISH STAN ,  HUNZIKER GUIDO HERMANN ,  ZHOU JIANHUI

    IPC: G02F1/37 ,  G02F1/35 ,  H04B10/17 ,  H04J14/00 ,  H04J14/02 ,  H04B10/04

    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.

    METHOD AND SYSTEM FOR CONTROLLING OPTICAL AMPLIFICATION IN WAVELENGTH DIVISION MULTIPLEX OPTICAL TRANSMISSION
    15.
    发明专利
    METHOD AND SYSTEM FOR CONTROLLING OPTICAL AMPLIFICATION IN WAVELENGTH DIVISION MULTIPLEX OPTICAL TRANSMISSION 未知

    公开(公告)号：CA2254544C

    公开(公告)日：2002-04-16

    申请号：CA2254544

    申请日：1998-11-26

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： TEICHMANN BERND ,  BODE DIRK ,  ZHOU JIANHUI

    IPC: H04J14/00 ,  H04B10/07 ,  H04B10/29 ,  H04B10/294 ,  H04J14/02 ,  H04B10/17

    Abstract: The present invention relates generally to the field of optical transmission and particularly to a method and a system for controlling optical amplification in wavelength division multiplex optical transmission. WDM systems currently under development will have eighty or more channels, i.e. modulated optical signal s with different wavelengths (known as Dense Wavelength Division Multiplexing, DWDM). These DWDM systems are demanding optical amplifiers which, especially considering the cascadation of a plurality of optical amplifiers along the transmission path of the DWDM system, have only very limited tolerances in certain parameters. Among these parameters gain flatness and gain tilt are o f special importance. The present invention discloses a method and a system which make use of auxiliary optical signals having a given power level which is equal for all auxiliary signals. Differences in the power levels of the auxiliary signals after optical amplification are used for the control of the optical amplifiers of the WDM system.

    17.
    发明专利
    未知

    公开(公告)号：DE69838127T2

    公开(公告)日：2008-05-15

    申请号：DE69838127

    申请日：1998-01-27

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： BODE DIRK ,  ZHOU JIANHUI ,  TEICHMANN BERND

    IPC: H04J14/00 ,  H04J14/02 ,  H04B10/07 ,  H04B10/29 ,  H04B10/294

    Abstract: The present invention relates generally to the field of optical transmission and particularly to a method and a system for controlling optical amplification in wavelength division multiplex optical transmission. WDM systems currently under development will have eighty or more channels, i. e. modulated optical signals with different wavelengths (known as Dense Wavelength Division Multiplexing, DWDM). These DWDM systems are demanding optical amplifiers which, especially considering the cascadation of a plurality of optical amplifiers along the transmission path of the DWDM system, have only very limited tolerances in certain parameters. Among these parameters gain flatness and gain tilt are of special importance. The present invention discloses a method and a system which make use of auxiliary optical signals having a given power level which is equal for all auxiliary signals. Differences in the power levels of the auxiliary signals after optical amplification are used for the control of the optical amplifiers of the WDM system.

    FAST GAIN CONTROL FOR OPTICAL AMPLIFIERS
    19.
    发明专利
    FAST GAIN CONTROL FOR OPTICAL AMPLIFIERS 未知

    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

    IPC: H01S3/10 ,  H01S3/06 ,  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, 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.

    20.
    发明专利
    未知

    公开(公告)号：DE69838127D1

    公开(公告)日：2007-09-06

    申请号：DE69838127

    申请日：1998-01-27

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： BODE DIRK ,  ZHOU JIANHUI ,  TEICHMANN BERND

    IPC: H04J14/00 ,  H04J14/02 ,  H04B10/07 ,  H04B10/29 ,  H04B10/294

    Abstract: The present invention relates generally to the field of optical transmission and particularly to a method and a system for controlling optical amplification in wavelength division multiplex optical transmission. WDM systems currently under development will have eighty or more channels, i. e. modulated optical signals with different wavelengths (known as Dense Wavelength Division Multiplexing, DWDM). These DWDM systems are demanding optical amplifiers which, especially considering the cascadation of a plurality of optical amplifiers along the transmission path of the DWDM system, have only very limited tolerances in certain parameters. Among these parameters gain flatness and gain tilt are of special importance. The present invention discloses a method and a system which make use of auxiliary optical signals having a given power level which is equal for all auxiliary signals. Differences in the power levels of the auxiliary signals after optical amplification are used for the control of the optical amplifiers of the WDM system.

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