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1. 发明公开

EP4306490A3 OPTICAL FIBER GLASS PREFORM AND METHOD FOR MANUFACTURING OPTICAL FIBER GLASS PREFORM 审中-公开
公开(公告)号：EP4306490A3
公开(公告)日：2024-04-03
申请号：EP23201541.2
申请日：2022-06-28
申请人： SHIN-ETSU CHEMICAL CO., LTD.
发明人： MITTA, Ryo
IPC分类号： C03B23/13 , C03B37/014
摘要： Provided is an optical fiber glass preform in which a starting rod and a dummy glass are hardly separated from each other, and a method for manufacturing the glass preform. In the optical fiber glass preform, the dummy glass is fitted into one end of the starting rod, and a part of the dummy glass and the starting rod are surrounded by a clad glass. In the manufacturing method, at the time of connecting the starting rod and the dummy glass, a shape is adjusted in such a manner that an iron is brought into contact with a connection portion and is moved from a starting rod side toward a dummy glass side with appliance of a load.

3. 发明授权

EP4112570B1 OPTICAL FIBER GLASS PREFORM AND METHOD FOR MANUFACTURING OPTICAL FIBER GLASS PREFORM 审中-实审
公开(公告)号：EP4112570B1
公开(公告)日：2023-12-20
申请号：EP22181557.4
申请日：2022-06-28
发明人： MITTA, Ryo
IPC分类号： C03B23/13 , C03B37/014

4. 发明授权

EP4030204B1 MIKROSTRUKTURIERTE OPTISCHE FASER UND VORFORM DAFÜR 有权
公开(公告)号：EP4030204B1
公开(公告)日：2023-09-20
申请号：EP21152296.6
申请日：2021-01-19
发明人： NEUMANN, CHRISTIAN , ROSENBERGER, Manuel , SCHUSTER, KAY , PLASS, Jaqueline
IPC分类号： G02B6/02 , C03B37/014 , C03B37/012

5. 发明公开

EP4011842A1 APPARATUS AND METHOD FOR PRODUCING POROUS GLASS PREFORM 审中-公开
公开(公告)号：EP4011842A1
公开(公告)日：2022-06-15
申请号：EP21214149.3
申请日：2021-12-13
申请人： Shin-Etsu Chemical Co., Ltd.
发明人： NODA, Naoto
IPC分类号： C03B37/014
摘要： A method and an apparatus for producing a porous glass preform by using organosiloxane raw material is provided. The apparatus for producing the porous glass preform 12 according to the present embodiment is configured to mix organosiloxane in a liquid state being a raw material with a carrier gas in a vaporizer 6, heat this mixture to be vaporized, supply this vapor to a burner 13 as a gas raw material, and produce a porous glass preform by depositing a glass fine particle produced by combusting the gas raw material on a starting material, herein the apparatus for producing a porous glass preform includes a means for removing moisture 8 configured to remove moisture in the carrier gas and supply the vaporizer with the carrier gas. Thereby, if organosiloxane in a liquid state is used as a raw material of the glass fine particle, a polymerized material to be produced upon vaporizing in the vaporizer can be reduced.

6. 发明公开

EP3971145A1 MANUFACTURING METHOD OF GLASS BASE MATERIAL FOR OPTICAL FIBER 有权
公开(公告)号：EP3971145A1
公开(公告)日：2022-03-23
申请号：EP21196423.4
申请日：2021-09-13
申请人： SHIN-ETSU CHEMICAL CO., LTD.
发明人： KOJIMA, Hiroki
IPC分类号： C03B37/014
摘要： A manufacturing method of glass base material for optical fiber that can obtain glass base material for optical fiber with reduced fluctuation in optical properties in the longitudinal direction is provided. The manufacturing method of glass base material for optical fiber includes: a first heat treatment step in which the porous glass base material inserted in a vessel of a sintering furnace is heated by a heater installed around the periphery of the vessel while being raised or lowered in the longitudinal direction in a chlorine-based gas containing atmosphere in the vessel of the sintering furnace; a second heat treatment step in which the porous glass base material is heated by the heater to obtain a transparent glass body while being raised or lowered in the longitudinal direction in an inert gas containing atmosphere in the vessel after the first heat treatment step; and a preliminary fluorine doping step prior to the second heat treatment step in which one or both ends of the porous glass base material are heated by the heater in a fluorine-based gas containing atmosphere in the vessel.

7. 发明公开

EP3925935A1 METHOD OF SINTERING GLASS PREFORM WITH REDUCED HELIUM CONSUMPTION 审中-公开
公开(公告)号：EP3925935A1
公开(公告)日：2021-12-22
申请号：EP21171064.5
申请日：2021-04-28
申请人： Sterlite Technologies Limited
发明人： KHAN, Amjad , REDDY, Dr. Sudhakar , BHONGADE, Samir , D, Chitra
IPC分类号： C03B37/014
摘要： A method for sintering of a glass preform (102) with reduced helium gas consumption and with reduced cost without affecting any optical or other parameter of the fiber obtained from glass preform (102) processed in this way. The method includes a first step to perform dehydration of the glass preform (102) inside a dehydration module (104), a second step to perform down-feeding of the glass preform (102) inside a sintering furnace (106), a third step to perform sintering of the glass preform (102) inside the sintering furnace (106), a fourth step to move the glass preform (102) in upward motion, and a fifth step to perform re-sintering of the glass preform (102) inside the sintering furnace (106). Also, the glass preform (102) undergoes dehydration for time period in range of about 20 minutes to 120 minutes. Also, dehydration of the glass preform (102) is performed in presence of helium gas.

9. 发明公开

EP3633426A1 OPTICAL FIBER, METHOD FOR MANUFACTURING OPTICAL FIBER, AND OPTICAL FIBER BASE MATERIAL 审中-公开
公开(公告)号：EP3633426A1
公开(公告)日：2020-04-08
申请号：EP18810607.4
申请日：2018-04-03
申请人： Fujikura Ltd.
发明人： NAKAGOME, Hisayuki
IPC分类号： G02B6/02 , C03B37/014 , C03B37/018 , C03B37/027
摘要： The present invention provides an optical fiber 1 including: a core 11; and a cladding layer 12 that is provided on an outer circumference of the core 11, in which a Cl concentration in the cladding layer 12 is 0.029 wt% to 0.098 wt%.

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