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    PRODUCTION OF GERMANIUM-DOPED OPTICAL FIBER
    1.
    发明专利
    PRODUCTION OF GERMANIUM-DOPED OPTICAL FIBER 失效

    公开(公告)号：JPH10139463A

    公开(公告)日：1998-05-26

    申请号：JP25086197

    申请日：1997-09-16

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： CLAYTON JANE BILECKY ,  ESKILDSEN LARS ERIK ,  HANSEN PER BANG ,  HEADLEY CLIFFORD ,  REED WILLIAM ALFRED

    IPC: G02B6/00 ,  C03B37/025 ,  C03B37/027 ,  G02B6/02

    Abstract: PROBLEM TO BE SOLVED: To obtain an optical fiber reducing a loss caused by a stimulated Brillouin scattering by preparing an optical fiber perform having a Ge-doped core, heating a part thereof and performing a draw-forming at a specific drawing force. SOLUTION: This optical fiber is produced by preparing a perform as a glass rod having 1m length and 20-200mm outer diameter and an inside core as a high purity and a low loss silicate containing Ge, having 1-5mm diameter, and an outside clad layer as a glass layer having a lower refractive index than that of the inside core. The end part of the perform is heated at a high temperature and the optical fiber is drawn. The drawing force is changed in accordance with shapes of a sine wave, a triangular wave or a trapezoidal wave along the lengthwise direction of the fiber, and a minimum and a maximum forces therefor are 10-50g and 150-150g respectively. A preferable wave length of the sine wave is 3-30km, a preferable length of the base of the triangular wave is 3-30km, that of the base (longer side) of the trapezoidal wave is 3-15km, and that of the upside (shorter side) thereof is 1-13km.

    ARTICLE INCLUDING OPTICAL FIBER LASER DOPED WITH IMPROVED RARE-EARTH ELEMENT
    2.
    发明专利
    ARTICLE INCLUDING OPTICAL FIBER LASER DOPED WITH IMPROVED RARE-EARTH ELEMENT 失效

    公开(公告)号：JPH11223744A

    公开(公告)日：1999-08-17

    申请号：JP32872398

    申请日：1998-11-19

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： HEADLEY CLIFFORD ,  WALKER KENNETH LEE

    IPC: G02B6/287 ,  G02B6/28 ,  H01S3/06 ,  H01S3/067 ,  H01S3/07 ,  H01S3/094 ,  H04B10/17 ,  H04B10/29 ,  H04B10/16

    Abstract: PROBLEM TO BE SOLVED: To prevent self-excited pulse oscillation and a large noise by adding a conventional fiber laser in a single mode, which has a certain length and doesn't include rare-earth elements, to a laser cavity resonator to extend the length of the laser cavity resonator. SOLUTION: Radiation from an exciting laser 11 is transmitted to a cladding excitation fiber 20 dopes with ytterbium through a multiple mode fiber 16. The fiber 20 is provided with a single mode core 21 and is doped with ytterbium. The optical fiber in the single mode which doesn't include rare-earth elements is added to the laser cavity resonator to extend the length of the laser cavity resonator so that the distance between the terminal on the lower end side of the optical fiber doped with rare-earth elements and an output coupler may be extended. A length A of the optical fiber in the single mode which is provided between the optical fiber doped with rare-earth elements and a second reflector and doesn't include rare-earth elements is >0.3 L, preferably, >0.5 L (L is the effective length of the laser cavity resonator).

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