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    FIBER AMPLIFIER HAVING MODIFIED GAIN SPECTRUM
    3.
    发明专利
    FIBER AMPLIFIER HAVING MODIFIED GAIN SPECTRUM 未知

    公开(公告)号：CA2057535A1

    公开(公告)日：1993-02-13

    申请号：CA2057535

    申请日：1991-12-12

    Applicant: CORNING INC

    Inventor： HALL DOUGLAS W ,  NEWHOUSE MARK A

    IPC: G02B6/00 ,  H01S3/06 ,  H01S3/067 ,  H01S3/07 ,  H01S3/094 ,  H01S3/10 ,  H01S3/17 ,  H01S3/23 ,  H01S3/13

    Abstract: Disclosed is a fiber amplifier system including a gain fiber having a single-mode core containing dopant ions capable of producing stimulated emission of light at wavelength .lambda.s when pumped with light of wavelength .lambda.p. Absorbing ion filtering means is operatively associated with the gain fiber to alter the gain curve. If the absorbing ions are the same as the gain ions of the gain fiber, the system further includes means for preventing pump light from exciting the gain ions of the filtering means. The excitation prevention means may take the form of means for attenuating pump light. If the absorbing ions are different from the dopant ions of the gain fiber, such absorbing ions can be subjected to light at wavelength .lambda.p, but they will remain unexcited. Such absorbing ions can be used to co-dope the gain fiber, or they can be incorporated into the core of a fiber that is in series with the gain fiber.

    OPTICAL FIBER AMPLIFIER AND COUPLER
    4.
    发明专利
    OPTICAL FIBER AMPLIFIER AND COUPLER 未知

    公开(公告)号：CA2056925A1

    公开(公告)日：1992-09-19

    申请号：CA2056925

    申请日：1991-12-04

    Applicant: CORNING INC

    Inventor： HALL DOUGLAS W ,  MILLER WILLIAM J ,  WEBB THOMAS W ,  WEIDMAN DAVID L

    IPC: G02F1/35 ,  G02B6/28 ,  G02B6/287 ,  G02B6/34 ,  H01S3/06 ,  H01S3/067 ,  H01S3/07 ,  H01S3/094 ,  H01S3/10 ,  H01S3/02 ,  G02B27/10 ,  G02B6/26

    Abstract: Disclosed is a fiber amplifier system in which a gain fiber is operatively combined with a fiber optic coupler having first and second coupler optical fibers. The coupler fibers are fused together along a portion of their lengths to form a wavelength dependent coupling region whereby most of the light power of a wavelength .lambda.s couples between them, and most of the light power of a wavelength .lambda.p that is introduced into the first fiber remains in it. The mode field diameter of the first coupler fiber is substantially matched to that of the gain fiber and is smaller than that of the second coupler fiber. One end of the first coupler fiber is spliced to the gain fiber. A transmission fiber is spliced to the second coupler fiber, and a laser diode introduces pumping light of wavelength .lambda.p to the first coupler fiber. The fiber optic coupler preferably includes an elongated body of matrix glass through which the first and second coupler fibers extend. The matrix glass has a refractive index n3 that is lower than that of the fiber claddings. The fibers are fused together along with the midregion of the matrix glass, the fiber cores being more closely spaced at the central portion of the midregion than at the body endfaces, thereby forming the coupling region.

    L-band amplification with detuned 980nm pump
    5.
    发明专利
    L-band amplification with detuned 980nm pump 未知

    公开(公告)号：AU1477100A

    公开(公告)日：2000-06-13

    申请号：AU1477100

    申请日：1999-11-10

    Applicant: CORNING INC

    Inventor： FLOOD FELTON A ,  HALL DOUGLAS W

    IPC: H01S3/102 ,  H01S3/06 ,  H01S3/067 ,  H01S3/094 ,  H01S3/10 ,  H01S3/16

    Abstract: A method of operating an optical amplifier for improved gain and pump-to-signal conversion efficiency in a long wavelength spectral region (L-band) of the emission spectrum of a rare earth doped gain medium having a known pump absorption band involves the steps of providing an optical signal to the amplifier having a large-signal input power; and providing pumping light to the amplifier having a wavelength that is different from a center wavelength of the known pump absorption band for amplifying the optical signal. Signal gain and improved pump-to-signal conversion efficiency was demonstrated for an erbium L-band signal by detuning the pump between about ±0-30 nm on either side of the pump band center wavelength of 979-980 nm. An optical amplifier employing the described method is also disclosed.

    SWITCHABLE FIBER OPTIC DEVICE FOR FIBER TRANSMISSION SYSTEM AND COMPONENTS THEREOF
    7.
    发明专利
    SWITCHABLE FIBER OPTIC DEVICE FOR FIBER TRANSMISSION SYSTEM AND COMPONENTS THEREOF 未知

    公开(公告)号：CA2201453A1

    公开(公告)日：1997-10-02

    申请号：CA2201453

    申请日：1997-04-01

    Applicant: CORNING INC

    Inventor： YADLOWSKY MICHAEL ,  HALL DOUGLAS W ,  BLASZYK ROBERT P

    IPC: H04B10/02 ,  G02B6/00 ,  G02B6/34 ,  H01S3/067 ,  H04B10/12 ,  H04B10/135 ,  H04B10/14 ,  H04B10/17 ,  H04B10/18 ,  H04B10/2581 ,  H04B10/16

    Abstract: A fiber optic device for use in fiber optic transmission systems and components thereof includes a pass-through fiber and one or more lengths of circulating fiber connected to the pass-through fiber by respective optical switches for selectively routing an optical signal through the circulating fiber lengths as it propagatesalong the pass-through fiber. The circulating fiber lengths are either dispersion compensating fibers or fibers doped with a substance that will amplify or absorbthe optical signal in the respective presence or absence of a pump signal. The invention thus allows various amounts of dispersion or gain (absorption) to be selectively switched into or out of use depending upon requirements at the time.For example, an amplifying component could serve as a pre- or power- or in-line amplifier device depending on the lesser or greater amount of gain fiber electedby switching. The device can be interconnected with the transmission system or components thereof via splicing to of the ends of the pass-through fiber or via optical switches connected to the ends of the pass through fiber.

    L-BAND AMPLIFICATION WITH DETUNED 980NM PUMP
    9.
    发明专利
    L-BAND AMPLIFICATION WITH DETUNED 980NM PUMP 未知

    公开(公告)号：CA2362087A1

    公开(公告)日：2000-06-02

    申请号：CA2362087

    申请日：1999-11-10

    Applicant: CORNING INC

    Inventor： FLOOD FELTON A ,  HALL DOUGLAS W

    IPC: H01S3/102 ,  H01S3/06 ,  H01S3/067 ,  H01S3/094 ,  H01S3/10 ,  H01S3/16

    Abstract: A method of operating an optical amplifier for improved gain and pump-to- signal conversion efficiency in a long wavelength spectral region (L-band) o f the emission spectrum of a rare earth doped gain medium having a known pump absorption band involves the steps of providing an optical signal to the amplifier having a large-signal input power; and providing pumping light to the amplifier having a wavelength that is different from a center wavelength of the known pump absorption band for amplifying the optical signal. Signal gain and improved pump-to-signal conversion efficiency was demonstrated for an erbium L-band signal by detuning the pump between about ~0-30nm on either si de of the pump band center wavelength of 979-980nm. An optical amplifier employing the described method is also disclosed.

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