公开(公告)号：DE60209775D1

公开(公告)日：2006-05-04

申请号：DE60209775

申请日：2002-10-31

Applicant: SUMITOMO ELECTRIC INDUSTRIES

Inventor： NAKAMURA MOTONORI ,  OOISHI TOSHIHIRO ,  OHGA YUICHI

IPC: C03B37/018 ,  C03B37/014

Abstract: The deposition of glass particulate material on a glass rod having a core is performed using a multi-burner multi-layer deposition in the following manner. The distribution of target jacketing ratios (the ratios of diameter of a consolidated optical fiber preform to diameter of the glass rod) of an optical fiber preform, whereby optical fibers of desired characteristics can be produced, is determined in the longitudinal direction of the glass rod. Based on the target ratio distribution in the longitudinal direction of the glass rod, the amount of the glass particulate material supplied from each burner to each point is adjusted to make a porous preform. Thus, an optical fiber preform obtained by clarifying the porous preform has a small variation in divergence ratio in the longitudinal direction, the divergence ratio being defined as the ratio of target jacketing ratio to jacketing ratio of the resulting preform.

公开(公告)号：CA2099942C

公开(公告)日：2004-10-26

申请号：CA2099942

申请日：1993-07-06

Applicant: SUMITOMO ELECTRIC INDUSTRIES

Inventor： HOSHINO SUMIO ,  DANZUKA TOSHIO ,  OHGA YUICHI ,  ITO MASUMI ,  MUKAI KATSUZO

IPC: C03B37/027 ,  C03B20/00 ,  C03B37/012 ,  C03B37/014 ,  C03B37/018 ,  G02B6/00 ,  C03B37/023

Abstract: A glass preform for an optical fiber is effectively drawn by connecting dummy rods to both ends of the glass preform and connecting the dummy rods to fitting members.

公开(公告)号：AU773229B2

公开(公告)日：2004-05-20

申请号：AU6549701

申请日：2001-08-27

Applicant: SUMITOMO ELECTRIC INDUSTRIES

Inventor： NAGAYAMA KATSUYA ,  OHGA YUICHI ,  SAITOH TATSUHIKO ,  ISHIKAWA SHINJI ,  TSUCHIYA ICHIRO ,  UCHIYAMA TAKENORI

IPC: C03B37/027 ,  C03B37/029 ,  C03B37/15 ,  G02B6/02 ,  G02B6/036 ,  G02B6/16 ,  B29D31/00

Abstract: An optical fiber preform 2 having a viscosity ratio R eta = eta 0/ eta t of 2.5 or less between the core average viscosity eta 0 and the total average viscosity eta t is prepared, and is drawn by a drawing furnace 11 so as to yield an optical fiber 3, which is then heated to a temperature within a predetermined range so as to be annealed by a heating furnace 21 disposed downstream the drawing furnace 11. Here, upon annealing in the heating furnace 21, the fictive temperature Tf within the optical fiber lowers, thereby reducing the Rayleigh scattering loss. At the same time, the viscosity ratio condition of R eta ≤ 2.5 restrains the stress from being concentrated into the core, thereby lowering the occurrence of structural asymmetry loss and the like . Hence, an optical fiber which can reduce the transmission loss caused by the Rayleigh scattering loss and the like as a whole, and a method of making the same can be obtained.

公开(公告)号：AU4581002A

公开(公告)日：2002-12-12

申请号：AU4581002

申请日：2002-06-05

Applicant: SUMITOMO ELECTRIC INDUSTRIES

Inventor： NAKAMURA MOTONORI ,  OHGA YUICHI ,  YOKOTA DAISUKE ,  KASUU OSAMU

IPC: G01N21/67 ,  G01N21/72 ,  G02B6/255

Abstract: An optical fiber splicing method capable of fully reducing the splice loss at room temperature is provided. In the optical fiber splicing method in accordance with the present invention, respective end faces of optical fibers are fused together in a splicing step (S101). In a condition setting step (S102), a set value alpha 0 is set. Thereafter, a heating step (S103), a measuring step (S104), and a termination determining step (S105) are carried out repeatedly. In the heating step, a region including the fusion-spliced point is heated under a predetermined heating condition. In the measuring step, splice loss is measured. In the termination determining step, the splice loss alpha n measured in the measuring step and the set value alpha 0 set in the condition setting step are compared with each other in terms of magnitude. If the splice loss alpha n is not greater than the set value alpha 0, then it is determined that the alternation should be terminated, whereby the optical fiber connecting operation is terminated.

公开(公告)号：BR0105750A

公开(公告)日：2002-07-02

申请号：BR0105750

申请日：2001-11-29

Applicant: SUMITOMO ELECTRIC INDUSTRIES

Inventor： OOISHI TOSHIHIRO ,  OHGA YUICHI ,  YOKOYAMA YOSHIO ,  NAKAMURA MOTONORI

IPC: C03B37/014 ,  C03B37/018

Abstract: A plurality of glass particle synthesizing burners are disposed opposite to a rotating starting rod. The starting rod and the glass particle synthesizing burners are relatively reciprocally moved to each other in parallel to the axial direction, so that glass particles synthesized by the burners are sequentially deposited on the surface of the starting rod. The movement is stopped and restarted repeatedly once or more than once during one reciprocal movement. The method is for producing a preform for optical fibres by outside vapour deposition techniques.

公开(公告)号：GB2362645B

公开(公告)日：2002-03-20

申请号：GB0117080

申请日：1998-09-07

Applicant: SUMITOMO ELECTRIC INDUSTRIES

Inventor： ISHIHARA TOMOHIRO ,  OHGA YUICHI ,  TANAKA SATOSHI

IPC: C03B37/014

公开(公告)号：GB2357500A

公开(公告)日：2001-06-27

申请号：GB0107542

申请日：1999-08-26

Applicant: SUMITOMO ELECTRIC INDUSTRIES

Inventor： ISHIHARA TOMOHIRO ,  SAITOH TATSUHIKO ,  OHGA YUICHI

IPC: C03B37/014 ,  C03B8/04 ,  C03B20/00

Abstract: A high-quality, large glass article and a method of producing it; specifically, a long (1000 mm or longer) glass base material for optical fiber which is small in lengthwise variation and a method of producing it, the method comprising the first heating step of inserting a glass fine grain deposit synthesized by vapor phase synthesizing method into a heating furnace perpendicularly, heating the deposit at temperatures lower than a transparentizing temperature in a vacuum or depressurized atmosphere, removing gas remaining in the glass fine grain deposit and shrinking the deposit by heating, and the second heating step of heating the deposit at a transparentizing temperature to transparentize the glass fine grain deposit, characterized in that the second heating step controls heating for a preset time of not shorter than 70 mm so that a glass fine grain deposit surface temperature is 1400 to 1480 {C and is followed by a cooling step for cooling the glass article.

公开(公告)号：AU4781700A

公开(公告)日：2000-12-18

申请号：AU4781700

申请日：2000-05-26

Applicant: SUMITOMO ELECTRIC INDUSTRIES

Inventor： NAGAYAMA KATSUYA ,  SAITO TATSUHIKO ,  OHGA YUICHI ,  KUWAHARA KAZUYA

IPC: C03B37/027 ,  C03B37/029 ,  C03B37/12

Abstract: A drawing apparatus 1 comprises a drawing furnace 11, a heating furnace 21, and a resin curing section 31. An optical fiber 3 drawn upon heating in the drawing furnace 11 is sent to a heating furnace 21, where a predetermined part of the optical fiber 3 is annealed at a predetermined cooling rate. The temperature of a heater 22 of the heating furnace 21 at the furnace center is set to a temperature within the range from 1200 to 1600 DEG C. Thereafter, the optical fiber 3 is coated with a UV resin liquid 52 by a coating die 51, and the UV resin 52 is cured in the resin curing section 31, so as to yield a coated optical fiber 4.

公开(公告)号：DE69603441D1

公开(公告)日：1999-09-02

申请号：DE69603441

申请日：1996-10-22

Applicant: SUMITOMO ELECTRIC INDUSTRIES

Inventor： OHGA YUICHI ,  ISHIKAWA SHINJI ,  ENOMOTO TADASHI

IPC: G02B6/00 ,  C03B37/027 ,  C03C3/06 ,  C03C13/04 ,  G02B6/02

Abstract: A glass body for optical fiber containing GeO2-SiO2 glass in a core portion thereof, in which the GeO2-SiO2 glass has an absorbance at 5.16 eV of at least 1/mm but not higher than 2.5/mm or in which concentration of Ge contained in the GeO2-SiO2 glass substantially lies within the range of 1.1 x 10 to 2.8 x 10 mol/mm as calculated by the following general equation: wherein A is absorbance which is expressed by A = -log T (T being transmittance) and normalized per 1 mm of optical path length, C(Ge2+) is Ge concentration, epsilon 5.16ev is absorption coefficient (l/mol/cm), and l is optical path length. This invention is also directed to the use of such a glass body, an optical fiber and a method of preparing it.

公开(公告)号：DE69412308D1

公开(公告)日：1998-09-17

申请号：DE69412308

申请日：1994-03-01

Applicant: SUMITOMO ELECTRIC INDUSTRIES

Inventor： ITO MASUMI ,  DANZUKA TOSHIO ,  OHGA YUICHI ,  HOSHINO SUMIO ,  TSUCHIYA ICHIRO

IPC: C03B8/04 ,  C03B20/00 ,  C03B37/014 ,  G02B6/00

Abstract: In order to provide an improved process for the production of a glass preform for an optical fiber which includes substantially no bubble therein and also have a substantially uniform shape, there is provided a process for the production of a glass preform which comprises at least silica for an optical fiber comprising producing a body comprising a rod on which fine glass particles are deposited preferably by the vapor phase reactions and heating the body to vitrify under a reduced atmosphere or a vacuumed atmosphere so that the glass preform is produced; in which process the heating comprises a first heating step of degassing the body at a first heating temperature, a second heating step of shrinking the body at a second heating temperature which is higher than the first heating temperature and which is lower than a third heating temperature, and a third heating step of vitrifying the shrunken body at the third temperature which corresponds to a vitrification temperature of the fine glass particles so as to produce the glass preform.