公开(公告)号：CA2326253A1

公开(公告)日：2001-05-17

申请号：CA2326253

申请日：2000-11-17

Applicant: FUJIKURA LTD

Inventor： SEGI TAKESHI ,  AIZAWA TAKUYA ,  KASHIMA TAKAFUMI ,  SAKAI TETSUYA

IPC: G02B6/00 ,  H01S3/06 ,  H01S3/067 ,  H01S3/094 ,  H01S3/0941 ,  H01S3/10 ,  H01S3/13 ,  H01S3/131 ,  H04B10/29 ,  H04B10/293 ,  H04B10/294 ,  H04B10/564 ,  H04B10/572 ,  H04B10/17

Abstract: In an optical amplifier using a rare earth element-doped optical fiber such as an erbium-doped optical fiber, a variation of amplification gain resulting from temperature change is suppressed and the gain-temperature characteristic is enhanced. Moreover, the quantity of temperature compensation in the gain is easily adjustable. Light from an excitation light source is input to an optical fiber for optical amplificati on comprising a rare earth element-doped optical fiber, via a temperature compensation optical fiber comprising a rare earth element-doped optical fiber such as an erbium-doped optical fiber. By changing the length of this temperature compensation optical fiber, the quantity of temperature compensation is finely adjusted.

公开(公告)号：DE602005000180T8

公开(公告)日：2008-02-07

申请号：DE602005000180

申请日：2005-03-10

Applicant: FUJIKURA LTD

Inventor： KOBAYASHI YASUKO ,  SUGIMOTO RYO ,  AIZAWA TAKUYA ,  SAKAI TETSUYA

IPC: H01S3/067 ,  H04B10/07 ,  H01S3/00 ,  H01S3/0941 ,  H01S3/13 ,  H04B10/071 ,  H04B10/077 ,  H04B10/29 ,  H04B10/291

Abstract: A method for detecting a connector disengagement of an optical fiber amplifier (1) and a transmission optical fiber (14) connected thereto, the optical fiber amplifier including a doped optical fiber (4) and a pumping light source (9B,10), and the transmission optical fiber including at least one connecting portion connected to an output of the optical fiber amplifier, includes the steps of: measuring a reflection from the transmission optical fiber to the optical fiber amplifier; and comparing the reflection to an allowable range between a first threshold that is greater than a predetermined reflection in the absence of a connector disengagement, and a second threshold that is smaller than the predetermined reflection in the absence of a connector disengagement; determining that there is no connector disengagement when the measured reflection is within the allowable range; and determining that there is a connector disengagement otherwise.

公开(公告)号：DE602005000180T2

公开(公告)日：2007-08-30

申请号：DE602005000180

申请日：2005-03-10

Applicant: FUJIKURA LTD

Inventor： KOBAYASHI YASUKO ,  SUGIMOTO RYO ,  AIZAWA TAKUYA ,  SAKAI TETSUYA

IPC: H01S3/067 ,  H04B10/07 ,  H01S3/00 ,  H01S3/0941 ,  H01S3/13 ,  H04B10/071 ,  H04B10/077 ,  H04B10/29 ,  H04B10/291

Abstract: A method for detecting a connector disengagement of an optical fiber amplifier (1) and a transmission optical fiber (14) connected thereto, the optical fiber amplifier including a doped optical fiber (4) and a pumping light source (9B,10), and the transmission optical fiber including at least one connecting portion connected to an output of the optical fiber amplifier, includes the steps of: measuring a reflection from the transmission optical fiber to the optical fiber amplifier; and comparing the reflection to an allowable range between a first threshold that is greater than a predetermined reflection in the absence of a connector disengagement, and a second threshold that is smaller than the predetermined reflection in the absence of a connector disengagement; determining that there is no connector disengagement when the measured reflection is within the allowable range; and determining that there is a connector disengagement otherwise.

公开(公告)号：DE602005000180D1

公开(公告)日：2006-11-30

申请号：DE602005000180

申请日：2005-03-10

Applicant: FUJIKURA LTD

Inventor： KOBAYASHI YASUKO ,  SUGIMOTO RYO ,  AIZAWA TAKUYA ,  SAKAI TETSUYA

IPC: H01S3/067 ,  H04B10/07 ,  H01S3/00 ,  H01S3/0941 ,  H01S3/13 ,  H04B10/071 ,  H04B10/077 ,  H04B10/29 ,  H04B10/291

Abstract: A method for detecting a connector disengagement of an optical fiber amplifier (1) and a transmission optical fiber (14) connected thereto, the optical fiber amplifier including a doped optical fiber (4) and a pumping light source (9B,10), and the transmission optical fiber including at least one connecting portion connected to an output of the optical fiber amplifier, includes the steps of: measuring a reflection from the transmission optical fiber to the optical fiber amplifier; and comparing the reflection to an allowable range between a first threshold that is greater than a predetermined reflection in the absence of a connector disengagement, and a second threshold that is smaller than the predetermined reflection in the absence of a connector disengagement; determining that there is no connector disengagement when the measured reflection is within the allowable range; and determining that there is a connector disengagement otherwise.

公开(公告)号：CA2326253C

公开(公告)日：2007-07-03

申请号：CA2326253

申请日：2000-11-17

Applicant: FUJIKURA LTD

Inventor： SEGI TAKESHI ,  KASHIMA TAKAFUMI ,  AIZAWA TAKUYA ,  SAKAI TETSUYA

IPC: G02B6/00 ,  H01S3/06 ,  H01S3/067 ,  H01S3/094 ,  H01S3/0941 ,  H01S3/10 ,  H01S3/13 ,  H01S3/131 ,  H04B10/29 ,  H04B10/293 ,  H04B10/294 ,  H04B10/564 ,  H04B10/572

Abstract: In an optical amplifier using a rare earth element-doped optical fiber such as an erbium-doped optical fiber, a variation of amplification gain resulting from temperature change is suppressed and the gain-temperature characteristic is enhanced. Moreover, the quantity of temperature compensation in the gain is easily adjustable. Light from an excitation light source is input to an optical fiber for optical amplificati on comprising a rare earth element-doped optical fiber, via a temperature compensation optical fiber comprising a rare earth element-doped optical fiber such as an erbium-doped optical fiber. By changing the length of this temperature compensation optical fiber, the quantity of temperature compensation is finely adjusted.

公开(公告)号：GB2361579B

公开(公告)日：2004-03-24

申请号：GB0027996

申请日：2000-11-16

Applicant: FUJIKURA LTD

Inventor： SEGI TAKESHI ,  AIZAWA TAKUYA ,  SAKAI TETSUYA ,  KASHIMA TAKAFUMI

IPC: G02B6/00 ,  H01S3/06 ,  H01S3/067 ,  H01S3/094 ,  H01S3/0941 ,  H01S3/10 ,  H01S3/13 ,  H01S3/131 ,  H04B10/29 ,  H04B10/293 ,  H04B10/294 ,  H04B10/564 ,  H04B10/572

Abstract: In an optical amplifier using a rare earth element-doped optical fiber such as an erbium-doped optical fiber, a variation of amplification gain resulting from temperature change is suppressed and the gain-temperature characteristic is enhanced. Moreover, the quantity of temperature compensation in the gain is easily adjustable. Light from an excitation light source is input to an optical fiber for optical amplification comprising a rare earth element-doped optical fiber, via a temperature compensation optical fiber comprising a rare earth element-doped optical fiber such as an erbium-doped optical fiber. By changing the length of this temperature compensation optical fiber, the quantity of temperature compensation is finely adjusted.

公开(公告)号：GB2361579A

公开(公告)日：2001-10-24

申请号：GB0027996

申请日：2000-11-16

Applicant: FUJIKURA LTD

Inventor： SEGI TAKESHI ,  AIZAWA TAKUYA ,  SAKAI TETSUYA ,  KASHIMA TAKAFUMI

IPC: G02B6/00 ,  H01S3/06 ,  H01S3/067 ,  H01S3/094 ,  H01S3/0941 ,  H01S3/10 ,  H01S3/13 ,  H01S3/131 ,  H04B10/29 ,  H04B10/293 ,  H04B10/294 ,  H04B10/564 ,  H04B10/572

Abstract: An optical amplifier comprises, an optical fibre 6 for temperature compensation inserted between an excitation light source 7 and an optical fibre I for optical amplification. The optical fibre 6 for temperature compensation changes the supply quantity of the excitation light with temperature change, to thereby compensate for variations in gain with temperature change of the optical fibre for optical amplification. The optical fibre 6 for temperature compensation may be a rare earth element-doped optical fibre. The rare earth element may be for example, samarium (Sm), thulium (Tm), neodymium (Nd), erbium (Er),or praseodymium (Pr). The optical fibre for temperature compensation may have a core doped with an amount of Er ranging from 1000 to 2000 ppm. A temperature compensation method for an optical amplifier is also disclosed.

公开(公告)号：EP2434305A4

公开(公告)日：2015-02-18

申请号：EP10777584

申请日：2010-05-21

Applicant: FUJIKURA LTD

Inventor： OHMORI KENICHI ,  AIZAWA TAKUYA ,  NAKAO OSAMU

IPC: G01R33/05 ,  G01C17/30 ,  G01R33/02

CPC classification number: G01R33/05 ,  G01C17/30 ,  G01R33/04

公开(公告)号：EP2348572A4

公开(公告)日：2013-04-17

申请号：EP09825935

申请日：2009-11-13

Applicant: FUJIKURA LTD

Inventor： UEMICHI YUSUKE ,  AIZAWA TAKUYA ,  NAKAO OSAMU

IPC: H01P5/10 ,  H01L23/12 ,  H01L23/498 ,  H01L23/66 ,  H01P11/00

CPC classification number: H01P5/10 ,  H01L23/3114 ,  H01L23/49822 ,  H01L23/66 ,  H01L2223/6627 ,  H01L2224/13 ,  H01L2924/09701 ,  H01L2924/1903 ,  H01L2924/3011 ,  H01P11/00

公开(公告)号：EP2117026A4

公开(公告)日：2012-03-14

申请号：EP08711072

申请日：2008-02-08

Applicant: FUJIKURA LTD

Inventor： ITOI KAZUHISA ,  NAGASU KATSUBUMI ,  AIZAWA TAKUYA ,  NAKAO OSAMU

IPC: H01H36/00 ,  G01R33/00

CPC classification number: G01R33/09 ,  G01D5/147 ,  G01R33/0011 ,  G01R33/07 ,  G01R33/072