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    DEVICE INCLUDING OPTICAL FIBER RAMAN AMPLIFIER
    1.
    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.

    OPTICAL WDM TRANSMISSION SYSTEM
    2.
    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).

    OPTICAL TRANSMISSION SYSTEM
    3.
    发明专利
    OPTICAL TRANSMISSION SYSTEM 失效

    公开(公告)号：JP2001285198A

    公开(公告)日：2001-10-12

    申请号：JP2001058123

    申请日：2001-03-02

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： BRENER IGAL M ,  MIKKELSEN BENNY ,  ROTTWITT KARSTEN ,  STARK JASON BLAIN

    IPC: G02F1/35 ,  H01S3/06 ,  H01S3/10 ,  H01S3/30 ,  H04B10/02 ,  H04B10/17 ,  H04B10/18 ,  H04B10/29 ,  H04B10/16

    Abstract: PROBLEM TO BE SOLVED: To solve a problem of nonlinearity of fibers in a long distance communication system. SOLUTION: The optical transmission system of this invention in a system employing an optical fiber optical path (especially in a system where a DWDM is used to transmit a power signal with a comparatively high level is sent to a low scattering fiber) is formed to have an optical phase conjugation unit 200 at its alternate iteration site and minimizes the presence of nonlinearity resulting from 4-wave mixing and other Kerr effect. Each fiber span 160 includes a Raman gain to realize 'absorption of negative components' along the length of the fiber 160 thereby realizing a substantially symmetrical power distribution along the length of each span. Then the presence of the symmetrical power distribution at each side face of the optical phase conjugation unit 200 can remarkably enhance the performance.

    LIGHT TRANSMISSION SYSTEM
    4.
    发明专利
    LIGHT TRANSMISSION SYSTEM 失效

    公开(公告)号：JP2001281715A

    公开(公告)日：2001-10-10

    申请号：JP2001056620

    申请日：2001-03-01

    Applicant: LUCENT TECHNOLOGIES INC

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

    IPC: G02F1/35 ,  H01S3/06 ,  H01S3/30 ,  H04B10/02 ,  H04B10/17 ,  H04B10/18 ,  H04B10/29 ,  H04J14/00 ,  H04J14/02 ,  H04B10/16

    Abstract: PROBLEM TO BE SOLVED: To prevent a four-wave mixed component from being generated in signal bands at the time of performing the Raman amplification of optical signals propagating through an optical fiber. SOLUTION: This light transmission system 10 has two exciting light sources 18, 20 in order to perform the Raman amplification of optical signals poured into an optical fiber 16 from a light source 12 via an isolator 14 and amplifies the optical signals being in a C band (1,530 nm to 1,562 nm) and an L band (1,575 nm to 1,604 nm) by injecting exciting waves into the optical fiber 16 via a multiplexer 22. The exciting signals are selected so as to realize a relatively wide and flat composite gain spectrum having a band width wider by 50% or more than a band width to be generated by a single wavelength excitation, and also, are selected so as to prevent the four-wave mixed component from existing in either the C band or the L band.

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