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 .

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.

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.

公开(公告)号：AU733906B2

公开(公告)日：2001-05-31

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.

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.