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    OPTICAL WDM TRANSMISSION SYSTEM
    1.
    发明专利
    OPTICAL WDM TRANSMISSION SYSTEM 审中-公开

    公开(公告)号：JP2002290332A

    公开(公告)日：2002-10-04

    申请号：JP2002012098

    申请日：2002-01-21

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： DU MEI ,  NIELSEN TORBEN N ,  ROTTWITT KARSTEN ,  STENTZ ANDREW J

    IPC: G02F1/35 ,  H01S3/067 ,  H01S3/094 ,  H01S3/10 ,  H01S3/30 ,  H04B10/02 ,  H04B10/17 ,  H04B10/18 ,  H04J14/00 ,  H04J14/02

    Abstract: PROBLEM TO BE SOLVED: To provide a WDM optical transmission system using high co- propagating Raman amplification. SOLUTION: The user of a co-propagating fiber Raman amplifier in an optical WDM transmission system has been found to be practical in the situation where the fiber amplifier is operated into depletion and the characteristics of the input signals are controlled to exhibit a reduced integrated relative intensity noise (RIN) over the fiber crosstalk bandwidth. In particular, the reduction in the integrated RIN can be achieved by increasing the number of input channels (by adding more messages or simply using dummy channels), encoding the data in a particular fashion to reduced the integrated RIN, or decorrelating the plurality of N input signals below a predetermined, relatively low frequency (for example, 2 MHz).

    DEVICE INCLUDING OPTICAL FIBER RAMAN AMPLIFIER
    2.
    发明专利
    DEVICE INCLUDING OPTICAL FIBER RAMAN AMPLIFIER 失效

    公开(公告)号：JP2001311973A

    公开(公告)日：2001-11-09

    申请号：JP2001056619

    申请日：2001-03-01

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： ACKERMAN DAVID ALAN ,  BACHER KENNETH L ,  DAUTREMONT-SMITH WILLIAM C ,  DU MEI ,  ROTTWITT KARSTEN ,  STENTZ ANDREW J ,  STRASSER THOMAS ANDREW ,  ZHANG LIMING

    IPC: G02F1/35 ,  H01S3/06 ,  H01S3/30 ,  H04B10/00 ,  H04B10/17

    Abstract: PROBLEM TO BE SOLVED: To provide a co-propagating Raman amplifying system which provides a sufficient on-off gain without causing pump signal crosstalk and signal pump signal crosstalk at unwanted level, and makes the device useful. SOLUTION: A fiber Raman amplifier is configured to use a co-propagating Raman pumping source, and this is advantageous in various system configurations. One example is a bi-directional communication system. A sufficient optical gain can be obtained with the co-propagating system by carefully configuring pumping source characteristics. These characteristics include the points such as (1) to use at least 50mW optical pump power, (2) to have a relatively large spectrum bandwidth in the pump for suppressing SBS, (3) a frequency difference among all the vertical pump modes of each pump laser is separated by at least a walk-off frequency between a pump laser frequency and a signal frequency, and all the strong vertical modes among individual pump laser are separated by at least an electric frequency bandwidth of a communication system.

    5.
    发明专利
    未知

    公开(公告)号：DE60133960D1

    公开(公告)日：2008-06-26

    申请号：DE60133960

    申请日：2001-02-19

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： ACKERMAN DAVID ALAN ,  BACHER KENNETH L ,  DAUTREMONT-SMITH WILLIAM ,  DU MEI ,  ROTTWITT KARSTEN ,  STENTZ ANDREW JOHN ,  STRASSER THOMAS ANDREW ,  ZHANG LIMING

    IPC: G02F1/35 ,  H01S3/30 ,  H01S3/06 ,  H04B10/00 ,  H04B10/17

    Abstract: A fiber Raman amplifier is configured to use a co-propagating Raman pump source, which may be beneficial in a variety of system configurations (for example, in bidirectional communication systems). By carefully configuring the pump source characteristics, sufficient optical gain can be achieved in the co-propagating arrangement, the characteristics including: (1) using an optical pump power of at least 50mW, (2) having a relatively large spectral bandwidth within the pump (to suppress SBS); and (3) a frequency difference between all longitudinal pump modes of each pump laser being separated by at least the walk-off frequency between the pump laser frequency and the signal frequency, and all intense longitudinal modes between different pump lasers being separated by at least the electrical bandwidth of the communication system.

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