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    2.
    发明专利
    未知

    公开(公告)号：DE69406947D1

    公开(公告)日：1998-01-02

    申请号：DE69406947

    申请日：1994-12-06

    Applicant: UNITED TECHNOLOGIES CORP

    Inventor： BALL GARY

    IPC: H01S3/06 ,  H01S3/067 ,  H01S3/098 ,  H01S3/23

    Abstract: A coupled multiple output fiber laser includes a plurality of laser diodes 10,50-56 each providing pump light 12,58-64 which is incident on respective Bragg gratings 16,74-80 which pass the pump wavelength and reflect a lasing wavelength. The fibers 20,90-96 are doped with a gain dopant such as Er3+ to provide lasing at the lasing wavelength in response to the pump light. Light beams 18,82-88 are incident on an optical coupler 22 which couples the light beams 18,82-88 to the light beams 40-48 on the fibers 30-38 based on a predetermined power distribution, e.g., equal distribution. The light 40 travels along the fiber 30 which acts as a common-cavity fiber. The light 40 reflects off a reflector 120 which provides reflected feedback light 122 which reenters the coupler 22 and is distributed to the individual cavity fibers 20,82-88 based on the same or a different predetermined power distribution. Output light 42-48 is provided on the fibers 32-38 which may be incident on a lens 160 to cause the beams to intersect. The length of each of the fibers 20,90-96 is adjusted by piezoelectric tuners 200-208 to provide coupled cavity phase-locking of the output beams 42-48. Also, each of the output beams 42-48 may be phase shifted by additional tuners 240-246. An additional output beam may be obtained by a light 232 which passes through the mirror 120.

    4.
    发明专利
    未知

    公开(公告)号：DE69602236T2

    公开(公告)日：1999-08-19

    申请号：DE69602236

    申请日：1996-02-27

    Applicant: UNITED TECHNOLOGIES CORP

    Inventor： BALL GARY ,  MELTZ GERALD

    IPC: G02B6/024 ,  G02B6/02 ,  G02B6/126 ,  H01S3/06 ,  H01S3/067 ,  H01S3/10 ,  G02B6/12

    Abstract: A single polarization fiber and/or amplifier includes a non-polarization preserving fiber 10 having a fiber grating tap 12 which has a predetermined length and strength ( DELTA n/n) and is oriented at a predetermined angle theta and has a grating spacing D so as to couple-out of the fiber 10 a predetermined amount of one polarization 24 over a predetermined wavelength range of an input light 16 and pass the other polarization 28 as output light 26, the grating length being substantially the length of the fiber 10. Alternatively, all or a portion of the fiber 10 may be doped to form a polarization sensitive optical amplifier.

    7.
    发明专利
    未知

    公开(公告)号：DE69601034T2

    公开(公告)日：1999-04-15

    申请号：DE69601034

    申请日：1996-03-06

    Applicant: UNITED TECHNOLOGIES CORP

    Inventor： BALL GARY

    IPC: H01S3/06 ,  H01S3/067 ,  H01S3/094 ,  H01S3/131 ,  H01S3/16

    Abstract: A dual wavelength pumped low noise fiber laser includes a fiber laser 10 comprising a pair of Bragg gratings 14,16 at opposite ends of a fiber laser cavity 18 which is co-doped with two rare-earth dopants, Er+3Yb+3, so as to allow lasing to occur at a lasing wavelength lambda L. A first pump signal 20 efficiently pumps the Yb to the excited state and the Yb energy is transitioned to the Er atoms which ultimately lase at the desire lasing frequency. Because Yb is pumped so efficiently, high pump absorption is achieved, thereby providing high laser output power and, consequently, reduced RIN. Simultaneously, a second pump signal 52 directly pumps the Er at a different wavelength lambda P2 which populates the lasing transition more quickly, thereby allowing sufficient bandwidth of a closed loop control on the second pump signal 52 to control low frequency RIN spiking due to relaxation oscillations in the laser.

    8.
    发明专利
    未知

    公开(公告)号：DE69601034D1

    公开(公告)日：1999-01-07

    申请号：DE69601034

    申请日：1996-03-06

    Applicant: UNITED TECHNOLOGIES CORP

    Inventor： BALL GARY

    IPC: H01S3/06 ,  H01S3/067 ,  H01S3/094 ,  H01S3/131 ,  H01S3/16

    Abstract: A dual wavelength pumped low noise fiber laser includes a fiber laser 10 comprising a pair of Bragg gratings 14,16 at opposite ends of a fiber laser cavity 18 which is co-doped with two rare-earth dopants, Er+3Yb+3, so as to allow lasing to occur at a lasing wavelength lambda L. A first pump signal 20 efficiently pumps the Yb to the excited state and the Yb energy is transitioned to the Er atoms which ultimately lase at the desire lasing frequency. Because Yb is pumped so efficiently, high pump absorption is achieved, thereby providing high laser output power and, consequently, reduced RIN. Simultaneously, a second pump signal 52 directly pumps the Er at a different wavelength lambda P2 which populates the lasing transition more quickly, thereby allowing sufficient bandwidth of a closed loop control on the second pump signal 52 to control low frequency RIN spiking due to relaxation oscillations in the laser.

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