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    METHOD AND APPARATUS FOR SUPPRESSION OF Q-SWITCHING IN LIGHT AMPLIFIER
    1.
    发明专利
    METHOD AND APPARATUS FOR SUPPRESSION OF Q-SWITCHING IN LIGHT AMPLIFIER 失效

    公开(公告)号：JPH10178226A

    公开(公告)日：1998-06-30

    申请号：JP29747497

    申请日：1997-10-29

    Applicant: CORNING INC

    Inventor： BURTON CLEMENT DOWD ,  HALL DOUGLAS WARREN

    IPC: H01S3/10 ,  G01F1/00 ,  G02B6/34 ,  H01S3/00 ,  H01S3/06 ,  H01S3/067 ,  H01S3/11 ,  H04B10/17 ,  H04J14/00 ,  H04J14/02

    Abstract: PROBLEM TO BE SOLVED: To obtain a method and an apparatus in which a Q-switching operation in a gain cavity is suppressed by a method wherein a second separate dichroic filter having a filter function which is different from that of a first separate filter or the like is contained. SOLUTION: Additional filters F1 , F2 are built in a wavelength multiple multiplexer WDM. From a port B1, a signal λ1 at a wavelength is transmitted to a port B3 through the dielectric filters F1 , F2 , and it is output to the direction of the east. At this time, a high transmittance insertion loss is displayed from about 1520nm up to 1545nm, a high transmittance is displayed from about 1549nm up to 1564nm, and a high transmittance insertion loss is displayed again from about 1564nm onward. A signal λ2 at a wavelength, e.g. a blue signal which is propagated to the west from the east is input to the port B3. It is reflected by a port B2 so as to be propagated to a port A1. The signal is reflected to a port A4 from the port A1, and it is sent through a filter amplifier EDFA so as to reach the port B1. The signal is reflected to a port B4 from the port B1 so as to be sent to a port A3, and it is reflected so as to be sent out to the west. This is because the filters F1 , F2 display a high transmittance with reference to the blue signal, and an abnormal transmission and an abnormal reflection at a 3dB wavelength are suppressed by the additional filters F1 , F2 .

    DISPERSION COMPENSATING OPTICAL WAVEGUIDE FIBER
    2.
    发明专利
    DISPERSION COMPENSATING OPTICAL WAVEGUIDE FIBER 审中-公开

    公开(公告)号：JP2002250834A

    公开(公告)日：2002-09-06

    申请号：JP2001377872

    申请日：2001-12-11

    Applicant: CORNING INC

    Inventor： ANTOS A JOSEPH ,  BLANKENSHIP MICHAEL G ,  HALL DOUGLAS WARREN ,  MURPHY EDWARD F ,  SMITH DAVID K

    IPC: G02B6/02 ,  G02B6/036 ,  H01S3/06 ,  H04B10/02 ,  H04B10/18 ,  G02B6/22

    Abstract: PROBLEM TO BE SOLVED: To provide a dispersion compensating optical fiber and a transmission system which compensate dispersion in the case of using a transmission fiber having zero dispersion in the wavelength of about 1310 nm in the band of 1550 nm. SOLUTION: The dispersion compensating optical fiber is provided with negative dispersion and zero or a negative dispersion gradient within the wavelength range of 1520 nm to 1565 nm. It its embodiment, the fiber is composed of a central core region 100 and a clad 101, and dispersion gradient within range of the wavelength including in the middle a core mode region 105 having a lower refractive index than that of the clad, a core ring region 102 having a refractive index between that of the central core region and that of the clad and a second core mode region 103 having a lower refractive index than that of the clad exists between zero and -1.2 ps/nm -km. The dispersion compensating fiber can be combined to a fiber amplifier in order to form a compensator for reducing an additional loss by it. In an embodiment, the dispersion compensating fiber is a distribution fiber amplifier.

    DISPERSION COMPENSATING OPTICAL WAVEGUIDE FIBER
    3.
    发明专利
    DISPERSION COMPENSATING OPTICAL WAVEGUIDE FIBER 审中-公开

    公开(公告)号：JP2002243967A

    公开(公告)日：2002-08-28

    申请号：JP2001377871

    申请日：2001-12-11

    Applicant: CORNING INC

    Inventor： ANTOS A JOSEPH ,  BLANKENSHIP MICHAEL G ,  HALL DOUGLAS WARREN ,  MURPHY EDWARD F ,  SMITH DAVID K

    IPC: G02B6/02 ,  G02B6/036 ,  H01S3/06 ,  H04B10/02 ,  H04B10/18 ,  G02B6/22

    Abstract: PROBLEM TO BE SOLVED: To provide dispersion compensating optical fibers which compensate dispersion in the case where a transmission fiber having zero dispersion in about 1,310 nm are used in a 1,550 nm band, and to provide a transmission system. SOLUTION: The dispersion compensating optical fibers can provide larger dispersion more negative than -20 ps/nm-km and attenuation less than 1 dB/km at wavelengths in the 1,520 to 1,565 nm region. Certain of the dispersion compensating fibers also exhibit a dispersion versus wavelength relationship having a negative slope in the above wavelength region, in order to compensate the dispersion versus wavelength slope of the transmission fiber. An example of the structure includes a core moat region 55 consisting of a central core region 50 and a cladding 51 and having a refractive index lower than that of an intermediate cladding, and a core ring region 52 having a refractive index between those of the central core region and the cladding. The dispersion compensating fiber can be combined with a fiber amplifier to form a compensator for reducing additional loss due to the dispersion compensating fiber. In one embodiment, the dispersion compensating fiber is a distributed fiber amplifier.

    4.
    发明专利
    未知

    公开(公告)号：BR9705598A

    公开(公告)日：1999-03-16

    申请号：BR9705598

    申请日：1997-10-24

    Applicant: CORNING INC

    Inventor： HALL DOUGLAS WARREN ,  BURTON CLEMENT DOWD

    IPC: H01S3/10 ,  G01F1/00 ,  G02B6/34 ,  H01S3/00 ,  H01S3/06 ,  H01S3/067 ,  H01S3/11 ,  H04B10/17 ,  H04J14/00 ,  H04J14/02 ,  G02F1/025

    Abstract: An improved four-port dichroic WDM, for use in a multiwavelength, bi-directional optical amplifier, having a dichroic filter for substantially reflecting a first wavelength band input to the WDM to an output of the WDM for the first wavelength band and for substantially transmitting a second wavelength band input to the WDM to an output of the WDM for the second wavelength band, in which some of a first 3dB wavelength in the first wavelength band is transmitted by the filter and some of a second 3 dB wavelength in the second wavelength band is reflected by the filter, includes another dichroic filter having a filter function different than the filter function of the WDM filter providing an insertion loss for the first or the second 3 dB wavelengths sufficient to reflect and transmit, respectively, substantially all of the first and second 3 dB wavelengths. Additional dichroic filters for suppressing 3 dB light are used to prevent Q-switching in an optical gain cavity in a multiwavelength, bi-directional optical amplifier formed by a reflection point in an optical path connected to the amplifier.

    DEVICE AND METHOD TO SUPPRESS Q-SWITCHING IN AN OPTICAL AMPLIFYING DEVICE
    5.
    发明专利
    DEVICE AND METHOD TO SUPPRESS Q-SWITCHING IN AN OPTICAL AMPLIFYING DEVICE 未知

    公开(公告)号：CA2217546A1

    公开(公告)日：1998-04-29

    申请号：CA2217546

    申请日：1997-10-06

    Applicant: CORNING INC

    Inventor： HALL DOUGLAS WARREN ,  BURTON CLEMENT DOWD

    IPC: H01S3/10 ,  G01F1/00 ,  G02B6/34 ,  H01S3/00 ,  H01S3/06 ,  H01S3/067 ,  H01S3/11 ,  H04B10/17 ,  H04J14/00 ,  H04J14/02 ,  H04B10/16

    Abstract: An improved four-port dichroic WDM, for use in a multiwavelength, bi-directional optical amplifier, having a dichroic filter for substantially ref lecting a first wavelength band input to the WDM to an output of the WDM for the first wavelength band and for substantially transmitting a second wavelength band input to the WDM to an output of the WDM for the second wavelength band, in which some of a first 3dB wavelength in the first wavelength band is transmitted by the filter and some of a second 3 dB wavelength in the second wavelength band is reflected by the filter, includes another dichroic filter having a filter function different than the filter function of the WDM filter providing an insertion loss for the first or the second 3 dB wavelengths sufficient to reflect and transmit, respectively, substantially all of the first and second 3 dB wavelengths. Additional dichroic filter for suppressing 3 dB light are use to prevent Q-switching in a optical gain cavity in a multiwavelength, bi-directional optical amplifier formed by a reflection point in an optical path connected to the amplifier.

    FIBER AMPLIFIER HAVING MODIFIED GAIN SPECTRUM
    8.
    发明专利
    FIBER AMPLIFIER HAVING MODIFIED GAIN SPECTRUM 未知

    公开(公告)号：CA2057535C

    公开(公告)日：2002-04-16

    申请号：CA2057535

    申请日：1991-12-12

    Applicant: CORNING INC

    Inventor： HALL DOUGLAS WARREN ,  NEWHOUSE MARK ANDREW

    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.

    Device and method to suppress Q-switching in an optical amplifying device
    10.
    发明专利
    Device and method to suppress Q-switching in an optical amplifying device 未知

    公开(公告)号：AU4288397A

    公开(公告)日：1998-05-07

    申请号：AU4288397

    申请日：1997-10-28

    Applicant: CORNING INC

    Inventor： BURTON CLEMENT DOWD ,  HALL DOUGLAS WARREN

    IPC: H01S3/10 ,  G01F1/00 ,  G02B6/34 ,  H01S3/00 ,  H01S3/06 ,  H01S3/067 ,  H01S3/11 ,  H04B10/17 ,  H04J14/00 ,  H04J14/02 ,  G02B6/28 ,  G02B6/293 ,  H04B10/12

    Abstract: An improved four-port dichroic WDM, for use in a multiwavelength, bi-directional optical amplifier, having a dichroic filter for substantially reflecting a first wavelength band input to the WDM to an output of the WDM for the first wavelength band and for substantially transmitting a second wavelength band input to the WDM to an output of the WDM for the second wavelength band, in which some of a first 3dB wavelength in the first wavelength band is transmitted by the filter and some of a second 3 dB wavelength in the second wavelength band is reflected by the filter, includes another dichroic filter having a filter function different than the filter function of the WDM filter providing an insertion loss for the first or the second 3 dB wavelengths sufficient to reflect and transmit, respectively, substantially all of the first and second 3 dB wavelengths. Additional dichroic filters for suppressing 3 dB light are used to prevent Q-switching in an optical gain cavity in a multiwavelength, bi-directional optical amplifier formed by a reflection point in an optical path connected to the amplifier.

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