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    12.
    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.

    18.
    发明专利
    未知

    公开(公告)号：DE69700572D1

    公开(公告)日：1999-11-11

    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.

    19.
    发明专利
    未知

    公开(公告)号：DE69700194T2

    公开(公告)日：1999-10-14

    申请号：DE69700194

    申请日：1997-02-04

    Applicant: LUCENT TECHNOLOGIES INC

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

    IPC: G02B6/00 ,  G02F1/35 ,  H01S3/30

    Abstract: The apparatus includes an optical fibre path of silica-based amplifier fibre that connects an input port and an output port, and a pump radiation input via WDM (13). The pump radiation is introduced at a wavelength lambda p less than a signal wavelength lambda s into the amplifier fibre such that it propagates in the fibre in an upstream direction towards the input port. Provided with the amplifier fibre is at least two lengths of fibre (L1,L2), with the sum of both lengths being at least 200m. An optical isolator is disposed between the two lengths such that passage of radiation of wavelength lambda s from the second to the first length is blocked. The pump path is closed upon itself and includes a portion of the amplifier fibre, the path selected such that the initial pump radiation can circulate in it. A second pump radiation of wavelength lambda p?'lambda p may be introduced into the pump path and a Bragg grating blocks its passage. Selected and placed Bragg gratings provide one or more optical cavities in the fibre ring, such that the input pump radiation is converted to the desired amplifier pump radiation. The wavelength lambda s may be 1310 nm, lambda p 1240 nm, and lambda p?' 1060 nm.

    20.
    发明专利
    未知

    公开(公告)号：DE69938444T2

    公开(公告)日：2009-07-09

    申请号：DE69938444

    申请日：1999-09-14

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： ESPINDOLA ROLANDO PATRICIO ,  STENTZ ANDREW JOHN ,  WAGENER JEFFERSON LYNN

    IPC: G02B6/14 ,  G02B6/293 ,  G02B6/02 ,  G02B6/34 ,  G02F1/01 ,  H01S3/067 ,  H04B10/02 ,  H04B10/43

    Abstract: An optical fiber grating device (10) including a length of optical fiber having a predetermined fundamental mode effective guide index and a longitudinally tapered region for accessing a fundamental mode of light. The tapered region has a grating (24) with a predetermined light spectral shaping property that shapes the light spectrum of the fundamental mode. A coating (26) surrounds the tapered region (18) of the fiber for modifying the fundamental mode effective guide index of the fiber in order to change the spectral shaping property of the grating.

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