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    22.
    发明专利
    未知

    公开(公告)号：DE69900082T2

    公开(公告)日：2001-11-15

    申请号：DE69900082

    申请日：1999-02-16

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： LEGRANGE JANE DEBORAH ,  WALKER KENNETH LEE ,  REED WILLIAM ALFRED

    IPC: G02F1/35 ,  H01S3/06 ,  H01S3/067 ,  H01S3/08 ,  H01S3/30 ,  H04B10/17

    Abstract: The performance of optical fiber Raman devices can be increased by substitution of a broadband reflector (typically a multilayer dielectric mirror) for some of the narrowband reflectors (typically fiber Bragg gratings) that are conventionally used to define the optical cavities of the device. The device exemplarily is a Raman laser or amplifier, and in preferred embodiments a broadband reflector reflects all the Stokesshifted wavelengths, such that the cavities are defined by the single broadband reflector and by a multiplicity of appropriately selected narrowband reflectors. Optionally the broadband reflector also serves to reflect the pump radiation.

    24.
    发明专利
    未知

    公开(公告)号：DE69700572T2

    公开(公告)日：2000-05-25

    申请号：DE69700572

    申请日：1997-02-04

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： GRUBB STEPHEN GREGORY ,  WALKER KENNETH LEE ,  STENTZ ANDREW JOHN

    IPC: G02F1/35 ,  H01S3/067 ,  H01S3/094 ,  H01S3/30 ,  H04B10/17

    Abstract: A low noise optical fiber Raman amplifier (FRA) comprises an upstream and a downstream length (23, 24) of silica-based amplifier fiber, of combined length >200 m, typically >1 km, with an optical isolator (25) disposed between the upstream and downstream lengths of amplifier fiber such that passage of backscattered signal radiation from the latter to the former is substantially blocked. In preferred embodiments counter-propagating pump radiation is coupled into the downstream length of amplifier fiber, and wavelength-selective means (26, 27) are provided for shunting the pump radiation around the optical isolator. The described FRA is advantageously incorporated into optical fiber communication systems. Exemplarily it can serve as power amplifier, as pre-amplifier, or as in-line amplifier. For instance, it can be used to replace conventional opto-electronic repeaters in existing 1.3 mu m fiber communication systems, or it can be used as power amplifier in a multi-subscriber optical fiber CATV system. In a still further exemplary embodiment, the FRA is used as a distributed pre-amplifier in a remotely pumped fiber communication system.

    25.
    发明专利
    未知

    公开(公告)号：DE69800008T2

    公开(公告)日：1999-12-23

    申请号：DE69800008

    申请日：1998-06-02

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： LEGRANGE JANE DEBORAH ,  WALKER KENNETH LEE

    IPC: G02B6/02 ,  G02B6/036 ,  G02B6/26 ,  H01S3/06 ,  H01S3/067 ,  H01S3/094 ,  H01S3/10 ,  H04B10/17

    Abstract: An optical communication system comprising a light source, a cladding pumped fiber laser (10) having a pump cladding (14), an optical fiber (20) attached to the cladding pumped fiber laser, the optical fiber having a cladding (24) and a protective coating (26). and an expedient that prevents substantial damage to the protective coating of the optical fiber upon transmission of at least 1 watt of residual light out of the pump cladding. Such an expedient may be the material of the protective coating, which may comprise a metal, such as gold, aluminium or copper, or a high refractive-index polymer such as a polyimide, polyetheretherketone, polytetrafluoroethene or an epoxide. Alternatively, or in addition, the expedient may comprise an article disposed at the attachment of the laser to the fiber and capable of conducting and dissipating heat produced by the residual light, for example, a metal block having a groove that supports the laser, the fiber or both.

    29.
    发明专利
    未知

    公开(公告)号：DE69900082D1

    公开(公告)日：2001-05-23

    申请号：DE69900082

    申请日：1999-02-16

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： LEGRANGE JANE DEBORAH ,  WALKER KENNETH LEE ,  REED WILLIAM ALFRED

    IPC: G02F1/35 ,  H01S3/06 ,  H01S3/067 ,  H01S3/08 ,  H01S3/30 ,  H04B10/17

    Abstract: The performance of optical fiber Raman devices can be increased by substitution of a broadband reflector (typically a multilayer dielectric mirror) for some of the narrowband reflectors (typically fiber Bragg gratings) that are conventionally used to define the optical cavities of the device. The device exemplarily is a Raman laser or amplifier, and in preferred embodiments a broadband reflector reflects all the Stokesshifted wavelengths, such that the cavities are defined by the single broadband reflector and by a multiplicity of appropriately selected narrowband reflectors. Optionally the broadband reflector also serves to reflect the pump radiation.

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