公开(公告)号：DE69031571T2

公开(公告)日：1998-02-26

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：CA2070602C

公开(公告)日：1998-04-21

申请号：CA2070602

申请日：1992-06-05

Applicant: FUJITSU LTD

Inventor： ARIMA TADAO ,  OKAMURA KOJI

IPC: G02B6/28 ,  G02B6/34 ,  G02B6/42 ,  H04J14/02

Abstract: A method of manufacturing an optical module for wavelength-division multiplex optical transmission, which module comprises a first optical fiber having a first port at its one end and a second and a third optical fiber fused to the first optical fiber at its side face such that the first optical fiber is positioned in the center between the second and third optical fibers. The manufacturing method comprises a first step of regulating the aspect ratio at the fused portion while heating the fused portion and elongating the fused portion at zero speed or a very low speed and a second step of regulating the coupling length of the fused portion while elongating the fused portion at a higher speed than in the aspect ratio regulating step under the conditions of the heating temperature of the fused portion lowered and the aspect ratio kept unchanged.

公开(公告)号：CA2042593C

公开(公告)日：1998-04-14

申请号：CA2042593

申请日：1990-10-31

Applicant: FUJITSU LTD

Inventor： OKAMURA KOUJI ,  ARIMA TADAO

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

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：DE69030736T2

公开(公告)日：1997-10-23

申请号：DE69030736

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：DE69027765T2

公开(公告)日：1997-01-09

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：DE69017279T2

公开(公告)日：1995-08-24

申请号：DE69017279

申请日：1990-06-19

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：CA2019074C

公开(公告)日：1993-06-01

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 ,  H01L27/14

Abstract: A photo-semiconductor module is disclosed wherein a reliable airtight condition can be obtained and an operability in assembly can be improved. The photo-semiconductor module comprises a substrate carried in a casing, a photo-semiconductor chip mounted on the substrate, and a support member carried on the substrate and having an inclined face which is inclined by an angle of 45 degrees with respect to a surface of the substrate. A semi-spherical lens is securely mounted on the inclined face of the support member, and an opening formed in a side wall of the casing is sealed airtight by a glass member while an upper portion of the casing is sealed airtight by a lid. When an optical fiber is mounted onto the casing such that an end face thereof may be located in the opening in the side wall of the casing, the optical fiber and the photo-semiconductor chip are optically coupled to each other by way of the semi-spherical lens.

公开(公告)号：CA2070602A1

公开(公告)日：1992-12-07

申请号：CA2070602

申请日：1992-06-05

Applicant: FUJITSU LTD

Inventor： ARIMA TADAO ,  OKAMURA KOJI

IPC: G02B6/28 ,  G02B6/34 ,  G02B6/42 ,  H04J14/02

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：DE69030736D1

公开(公告)日：1997-06-19

申请号：DE69030736

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：DE69017279D1

公开(公告)日：1995-04-06

申请号：DE69017279

申请日：1990-06-19

Applicant: FUJITSU LTD

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

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