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    DEVICE FOR SENSING RAMAN GAIN IN OPTICAL TRANSMISSION SYSTEM
    1.
    发明专利
    DEVICE FOR SENSING RAMAN GAIN IN OPTICAL TRANSMISSION SYSTEM 审中-公开

    公开(公告)号：JP2002064432A

    公开(公告)日：2002-02-28

    申请号：JP2001188954

    申请日：2001-06-22

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： DENKIN NATHAN M ,  LIN WENHUA ,  SHEDADEH FATIMAH

    IPC: H01S3/30 ,  H01S3/06 ,  H04B10/02 ,  H04B10/17 ,  H04B10/18 ,  H04B10/29 ,  H04J14/00 ,  H04J14/02 ,  H04B10/16

    Abstract: PROBLEM TO BE SOLVED: To provide a sensor for responding to the carrier signals of densely aggregated frequency-bands on an optical transmission system, especially, the sensor whereby the channels in one of the frequency-bands can be analyzed rapidly. SOLUTION: On the optical transmission system, by using the intrinsic sensor, a transmission degradation having a possibility of it affecting incoming optical channel signals is sensed. More concretely, in the sensor, after selecting a group of incoming channel signals, a first power signal P0 is generated over the selected group of channel signals, and a second power signal P1 is generated over the weighted signals of the selected group of channel signals. Thereafter, in the sensor, as the function of the first and second power signals P0, P1, a signal for indicating whether the specific transmission degradation affects the levels of the individual signals of the incoming channel signals or not is generated. Further, on the optical transmission system, when the transmission degradation has affected the incoming channel signals, a controller responding to the generated signal cancels the degradation.

    5.
    发明专利
    未知

    公开(公告)号：DE60141556D1

    公开(公告)日：2010-04-29

    申请号：DE60141556

    申请日：2001-06-11

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： DENKIN NATHAN M ,  LIN WENHUA ,  SHEHADEH FATIMAH

    IPC: H01S3/30 ,  H04B10/18 ,  H01S3/06 ,  H04B10/02 ,  H04B10/08 ,  H04B10/17 ,  H04B10/29 ,  H04J14/00 ,  H04J14/02

    Abstract: A unique sensor is used to detect a transmission impairment that may have affected incoming optical channel signals. The sensor, more specifically, selects a group of the incoming channel signals and generates a first power signal, P0, over the selected group of signals and generates a second power signals, P1, over a weighted version of the selected group of channel signals. The sensor then generates, as a function of the first and second power signals, P0 and P1, a signal indicative of whether the particular transmission impairment affected the levels of individual ones of the incoming channel signals. If so, then control apparatus offsets the impairment accordingly.

    SCALABLE OPTICAL DEMULTIPLEXING ARRANGEMENT FOR WIDE BAND DENSE WAVELENGTH DIVISION MULTIPLEXED SYSTEMS
    8.
    发明专利
    SCALABLE OPTICAL DEMULTIPLEXING ARRANGEMENT FOR WIDE BAND DENSE WAVELENGTH DIVISION MULTIPLEXED SYSTEMS 未知

    公开(公告)号：CA2278817A1

    公开(公告)日：2000-02-29

    申请号：CA2278817

    申请日：1999-07-26

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： SHEN TEK-MING ,  LIN WENHUA

    IPC: H04J14/00 ,  G02B6/293 ,  H04B10/2507 ,  H04B10/27 ,  H04B10/29 ,  H04J14/02

    Abstract: Substantial reduction in crosstalk and improved scalability for supporting high channel counts in dense wavelength division multiplexed (DWDM) systems is achieved in an optical demultiplexer arrangement that partitions the total number of input optical channels into separate demultiplexer modules, demultiplexes smaller groups of optical channels in the separate demultiplexer modules, and filters the individual optical channels at the outputs of the separate demultiplexer modules. Partitioning the total number of channels into smaller demultiplexing groups and post-filtering a reduced number of demultipexed optical channels reduces the number of non-adjacent channels that can contribute to the total crosstalk level. The modularity of the optical demultiplexer arrangement results in smaller device footprints and smaller free spectral ranges associated with the demultiplexer modules. This modularity also allows for future system upgrades without redesign and without disruption to existing service. In one illustrative embodiment, the optical demultiplexer arrangement includes a splitter or filter for directing the multi-wavelength input optical signal to one or more demultiplexer modules. Each of the demultiplexer modules separates a received multi-wavelength optical signal into individual wavelength channels. The individual wavelength channels are then supplied to bandpass post-filters which are coupled to each of the outputs of the demultiplexer modules.

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