公开(公告)号：AU6631190A

公开(公告)日：1991-05-31

申请号：AU6631190

申请日：1990-10-31

Applicant: FUJITSU LTD

Inventor： OKAMURA KOUJI ,  ARIMA TADAO

IPC: C03B37/018 ,  C03B8/04 ,  C03B19/14 ,  C03B20/00 ,  G02B6/00

Abstract: Doping is conducted by forming two constricted portions (28) in a quartz reaction tube (4) and charging a soln. contg. a rare earth element cpd. as a solute between the constricted portions 828). Accordingly, the dope concn. becomes uniform in the longitudinal direction of an optical fibre base amterial (30) and moreover, defects are difficult to occur. Furthermore, complicated works are not necessary. In a second method of the present invention, a soot-like core glass (26) is impregnated with mist-like soln. and high-precision control of a dope concn. becomes possible. In accordance with a third embodiment, the concn. is controlled in accordance with quantity of a laser beam passing through the soot-like core glass (26) and impregnation of the soln. is carried out. In this manner a dope concn. not depending on the density of the soot-like core glass can be obtd. In accordance with a fourth method, shaping of the soot-like core glass (26) is repeated several times at different temps., so that a dope concn. distribution in the core dia. direction can be set arbitrarily. @(57pp Dwg.No.2/19)@.

公开(公告)号：CA2042593A1

公开(公告)日：1991-05-01

申请号：CA2042593

申请日：1990-10-31

Applicant: FUJITSU LTD

Inventor： OKAMURA KOUJI ,  ARIMA TADAO

IPC: C03B37/018 ,  C03B20/00 ,  C03B19/14 ,  C03C21/00 ,  G02B6/00

Abstract: A first process of the invention comprises forming two constricted portions (28) at a quartz reaction tube (4), charging a solution of a compound of a rare earth element as a solution into the section between the constricted portions (28) for doping. By this, the doping concentration becomes uniform along the length of an optical fiber preform (30) with defects being rarely produced. This process does not involve any complicated operation. A second process of the invention comprises impregnating a solution in the form of a mist in a soot-like core glass (26) by which it becomes possible to control the doping concentration in high accuracy. A third process of the invention comprises impregnating a solution while controlling the concentration in response to a quantity of a transmitted laser beam through a soot-like core glass (26), by which the doping concentration is ensured independently of the density of the soot-like core glass. A fourth process of the invention comprises repeating formation of a soot-like core glass (26) at different temperatures, by which a distribution of a doping concentration along the radial direction of the core can be arbitrarily set.

公开(公告)号：DE69031571D1

公开(公告)日：1997-11-13

申请号：DE69031571

申请日：1990-10-31

Applicant: FUJITSU LTD

Inventor： OKAMURA KOUJI ,  ARIMA TADAO

IPC: C03B37/018 ,  C03B37/016

Abstract: Doping is conducted by forming two constricted portions (28) in a quartz reaction tube (4) and charging a soln. contg. a rare earth element cpd. as a solute between the constricted portions 828). Accordingly, the dope concn. becomes uniform in the longitudinal direction of an optical fibre base amterial (30) and moreover, defects are difficult to occur. Furthermore, complicated works are not necessary. In a second method of the present invention, a soot-like core glass (26) is impregnated with mist-like soln. and high-precision control of a dope concn. becomes possible. In accordance with a third embodiment, the concn. is controlled in accordance with quantity of a laser beam passing through the soot-like core glass (26) and impregnation of the soln. is carried out. In this manner a dope concn. not depending on the density of the soot-like core glass can be obtd. In accordance with a fourth method, shaping of the soot-like core glass (26) is repeated several times at different temps., so that a dope concn. distribution in the core dia. direction can be set arbitrarily. @(57pp Dwg.No.2/19)@.

公开(公告)号：DE69221952D1

公开(公告)日：1997-10-09

申请号：DE69221952

申请日：1992-06-05

Applicant: FUJITSU LTD

Inventor： ARIMA TADAO ,  OKAMURA KOJI

IPC: G02B6/28 ,  G02B6/34 ,  G02B6/42

Abstract: An optical module for wavelength-division multiplex optical transmission comprises a first optical fibre (32), having a first port its one end, and second and third optical fibres (34, 36) fused to the first optical fibre (32) at the sides thereof such that the first optical fibre is positioned in the centre between the second and third optical fibres. The method of manufacturing such a module comprises a first step, for regulating the aspect ratio at the fused portion (46), in which the fused portion is heated and elongated at substantially zero speed or a very low speed, and a second step, for regulating the coupling length of the fused portion, in which the fused portion is elongated at a higher speed than in the aspect ratio regulating step under the conditions that the heating temperature of the fused portion is lowered and the aspect ratio kept unchanged.

公开(公告)号：DE69027765D1

公开(公告)日：1996-08-14

申请号：DE69027765

申请日：1990-10-31

Applicant: FUJITSU LTD

Inventor： OKAMURA KOUJI ,  ARIMA TADAO

IPC: C03B37/018 ,  C03B37/016

Abstract: Doping is conducted by forming two constricted portions (28) in a quartz reaction tube (4) and charging a soln. contg. a rare earth element cpd. as a solute between the constricted portions 828). Accordingly, the dope concn. becomes uniform in the longitudinal direction of an optical fibre base amterial (30) and moreover, defects are difficult to occur. Furthermore, complicated works are not necessary. In a second method of the present invention, a soot-like core glass (26) is impregnated with mist-like soln. and high-precision control of a dope concn. becomes possible. In accordance with a third embodiment, the concn. is controlled in accordance with quantity of a laser beam passing through the soot-like core glass (26) and impregnation of the soln. is carried out. In this manner a dope concn. not depending on the density of the soot-like core glass can be obtd. In accordance with a fourth method, shaping of the soot-like core glass (26) is repeated several times at different temps., so that a dope concn. distribution in the core dia. direction can be set arbitrarily. @(57pp Dwg.No.2/19)@.

公开(公告)号：AU625144B2

公开(公告)日：1992-07-02

申请号：AU6631190

申请日：1990-10-31

Applicant: FUJITSU LTD

Inventor： OKAMURA KOUJI ,  ARIMA TADAO

IPC: C03B37/018 ,  G02B6/00

Abstract: Doping is conducted by forming two constricted portions (28) in a quartz reaction tube (4) and charging a soln. contg. a rare earth element cpd. as a solute between the constricted portions 828). Accordingly, the dope concn. becomes uniform in the longitudinal direction of an optical fibre base amterial (30) and moreover, defects are difficult to occur. Furthermore, complicated works are not necessary. In a second method of the present invention, a soot-like core glass (26) is impregnated with mist-like soln. and high-precision control of a dope concn. becomes possible. In accordance with a third embodiment, the concn. is controlled in accordance with quantity of a laser beam passing through the soot-like core glass (26) and impregnation of the soln. is carried out. In this manner a dope concn. not depending on the density of the soot-like core glass can be obtd. In accordance with a fourth method, shaping of the soot-like core glass (26) is repeated several times at different temps., so that a dope concn. distribution in the core dia. direction can be set arbitrarily. @(57pp Dwg.No.2/19)@.

公开(公告)号：CA2019074A1

公开(公告)日：1990-12-19

申请号：CA2019074

申请日：1990-06-15

Applicant: FUJITSU LTD

Inventor： MASUKO TAKAYUKI ,  OKAMOTO AKIRA ,  MORIYA KAORU ,  OKAMURA KOJI ,  ARIMA TADAO

IPC: G02B6/42 ,  H01L31/0203 ,  H01L31/0232

公开(公告)号：JP2005181479A

公开(公告)日：2005-07-07

申请号：JP2003419043

申请日：2003-12-17

Applicant: Fujitsu Ltd ,  富士通株式会社

Inventor： ARIMA TADAO ,  SAITO OSAMU ,  ISHIJIMA SHIZUO ,  TERAUCHI HIDEAKI

IPC: G02B6/00 ,  B26D7/02 ,  B26D7/08

Abstract: PROBLEM TO BE SOLVED: To enable the cutting of an optical fiber of short cutting slack to be suitably performed using a simple operation. SOLUTION: This cutting method of an optical fiber is characterized in that the coated part 10a of an optical fiber 10 and a fiber part 10b, in which a coat of the top end of the optical fiber 10 is removed are laid on a pair of front and rear fiber holding parts 22, 23, consisting of a cushion property member and a fiber pressing member 26 which has a hard and semicircle-shaped convex face developed over one pair of fiber holding parts 22, 23 and which holds/fixes the side of the coated part 10a presses the optical fiber from the upper side of the optical fiber and a scratch is given on the under surface of the fiber part 10b, in a state with the fiber part 10b being pressed and bent, to have a prescribed bending radius and the fiber part 10b made fractured, by using the bending stress of the fiber part 10b. COPYRIGHT: (C)2005,JPO&NCIPI

Abstract translation: 要解决的问题：为了能够使用简单的操作适当地执行切割松弛的光纤的切割。 解决方案：该光纤的切割方法的特征在于，将光纤10的顶端的涂层除去的光纤10的涂覆部分10a和纤维部分10b放置在 一对前后纤维保持部22,23由缓冲性构件和纤维按压构件26构成，该纤维按压构件26具有硬的半圆形凸面，在一对纤维保持部22,23上形成，并且保持/固定 涂覆部分10a的一侧从光纤的上侧按压光纤，并且在纤维部分10b被按压和弯曲的状态下在纤维部分10b的下表面上划伤，以使其具有 通过使用纤维部10b的弯曲应力使规定的弯曲半径和纤维部10b断裂。 版权所有（C）2005，JPO＆NCIPI

公开(公告)号：JP2555223B2

公开(公告)日：1996-11-20

申请号：JP51487790

申请日：1990-10-31

Applicant: FUJITSU LTD

Inventor： OKAMURA KOJI ,  ARIMA TADAO

IPC: C03B8/04 ,  C03B37/018 ,  G02B6/00

公开(公告)号：JPH07243941A

公开(公告)日：1995-09-19

申请号：JP3511394

申请日：1994-03-07

Applicant: FUJITSU LTD

Inventor： OKAMURA KOJI ,  ARIMA TADAO

IPC: G01M11/02 ,  G02B6/122

Abstract: PURPOSE:To improve the accuracy of measurement in a measuring method for optical waveguide transmission loss. CONSTITUTION:A triangular prism 40 is mounted on the surface of the core layer 13 of an optical waveguide 10 separated by the distance L from the outgoing end face 15 of the optical waveguide 10. The outgoing light of a light source 20 is projected to one face 41 of the triangular prism 40 at an incidence angle that it is totally reflected on the boundary surface 42 between the triangular prism 40 and the core layer 13, and the light power P0 of the reflected light on the boundary surface 42 after being emitted from the other face of the triangular prism 40 is measured by the first photo-detector 51. The outgoing light of the light source 20 is projected to one face 41 of the triangular prism 40 at an incidence angle that it is not totally reflected on the boundary surface 42, the light power P1 of the reflected light on the boundary surface 42 after being emitted from the other face 43 of the triangular prism 40 is measured by the first photo-detector 51, and the light power P2 of the outgoing light from an outgoing end face 15 after being transmitted to the core layer 13 through the boundary surface 42 is measured by the second photo-detector 52.