公开(公告)号：US12129198B2

公开(公告)日：2024-10-29

申请号：US17214856

申请日：2021-03-27

Applicant: Sterlite Technologies Limited

Inventor： Amjad Khan ,  Sudhakar Reddy ,  Samir Bhongade ,  Chitra D

IPC: C03B37/014

CPC classification number: C03B37/01446

Abstract: A method for sintering of a glass preform with reduced helium gas consumption and with reduced cost without affecting any optical or other parameter of the fiber obtained from glass preform processed in this way. The method includes a first step to perform dehydration of the glass preform inside a dehydration module, a second step to perform down-feeding of the glass preform inside a sintering furnace, a third step to perform sintering of the glass preform inside the sintering furnace, a fourth step to move the glass preform in upward motion, and a fifth step to perform re-sintering of the glass preform inside the sintering furnace. Also, the glass preform undergoes dehydration for time period in range of about 20 minutes to 120 minutes. Also, dehydration of the glass preform is performed in presence of helium gas.

公开(公告)号：US11733459B2

公开(公告)日：2023-08-22

申请号：US16286556

申请日：2019-02-26

Applicant: Sterlite Technologies Limited

Inventor： Pramod Watekar ,  Annesha Maity ,  Manoj Mittal ,  Sandeep Gaikwad ,  Sham Nagarkar ,  Bhalchandra Pathak ,  Sathis Ram

IPC: C03B37/014 ,  G02B6/13 ,  G02B6/02 ,  C03B19/14 ,  C03B29/00 ,  C03C25/002 ,  C03C25/64 ,  G02B6/12

CPC classification number: G02B6/13 ,  C03B19/1453 ,  C03B29/00 ,  C03B37/01446 ,  C03C25/002 ,  C03C25/64 ,  G02B6/02052 ,  G02B6/02319 ,  G02B6/02342 ,  G02B2006/12197

Abstract: The present disclosure provides a method for modification of surface of an initial optical fiber preform. The initial optical fiber preform is manufactured using at least one preform manufacturing process. The surface of the initial optical fiber preform is treated with 50-70 liters of chlorine per square meter of the surface of the initial optical fiber preform. The surface of the initial optical fiber preform is flame polished using a flame polishing module. The treatment of the surface of the initial optical fiber preform with chlorine and flame polishing of the surface of the initial optical fiber preform collectively converts the initial optical fiber preform into a modified optical fiber preform.

公开(公告)号：US20230159371A1

公开(公告)日：2023-05-25

申请号：US17895358

申请日：2022-08-25

Applicant: BCnC Co., Ltd.

Inventor： Changwook SEOL

IPC: C03B37/014

CPC classification number: C03B37/01446 ,  C03B37/01493

Abstract: A method of manufacturing synthetic quartz glass through an outside vapor deposition (OVD) process with improved deposition efficiency. When a hollow cylindrical synthetic quartz glass product is manufactured through an OVD method or the like, it is environmentally friendly in view of using a smaller amount of chlorine and is economical in view of requiring no separate treatment equipment, as compared to a conventional technique using silicon chloride (SiCl4). Also, the method, in which octamethylcyclotetrasiloxane is supplied to a deposition burner while being sprayed in the form of a droplet along with a high-pressure carrier gas and vaporized by the deposition burner, can effectively address the high-temperature heating and slow decomposition involved when octamethylcyclotetrasiloxane ([(CH3)2SiO]4) is used as a source for depositing silicon dioxide particles.

公开(公告)号：US09902643B2

公开(公告)日：2018-02-27

申请号：US15192590

申请日：2016-06-24

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Seiichi Shinada

IPC: C03B37/014

CPC classification number: C03B37/01446 ,  C03B37/01453 ,  C03B2201/12

Abstract: A production method of an optical fiber preform includes: forming a porous preform by depositing silica particles at an outer periphery of a core rod; and vitrifying the porous preform by conducting thermal treatment steps. At a first thermal treatment step that is an initial thermal treatment step of the thermal treatment steps, the porous preform is heated so that internal temperatures at two end portions in a longitudinal direction of the porous preform increase before an internal temperature of a center portion in the longitudinal direction increases.

公开(公告)号：US20180029921A1

公开(公告)日：2018-02-01

申请号：US15659998

申请日：2017-07-26

Applicant: Shin-Etsu Chemical Co., Ltd.

Inventor： Yuhei URATA

IPC: C03B37/014 ,  C03B19/14 ,  C03B19/06

CPC classification number: C03B37/01446 ,  C03B19/06 ,  C03B19/1453 ,  C03B2201/31 ,  C03B2207/20 ,  Y02P40/57

Abstract: Provided is a method for producing a glass preform for optical fiber which suppresses occurrences of cracks, coloring and foaming in a surface layer when sintering a glass fine particle deposit to allow a production yield to be improved. A method for producing a glass preform for optical fiber comprising the steps of: spraying glass fine particles containing silicon dioxide and germanium dioxide to a starting material moving upward while rotating to produce a glass fine particle deposit; and sintering the glass fine particle deposit while relatively varying a positional relationship between a heating source and the glass fine particle deposit in a sintering apparatus to produce a transparent glass preform, wherein a germanium dioxide reducing gas is contained in an atmosphere gas in the sintering apparatus.

公开(公告)号：US20170305781A1

公开(公告)日：2017-10-26

申请号：US15645303

申请日：2017-07-10

Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.

Inventor： Tetsuya HARUNA ,  Yoshiaki TAMURA ,  Yoshihiro TUKUDA

IPC: C03C3/06 ,  C03C25/68 ,  C03B37/014 ,  C03B37/018 ,  G02B6/036

CPC classification number: G02B6/03694 ,  C03B37/01446 ,  C03B37/01466 ,  C03B37/01473 ,  C03B37/018 ,  C03B2203/22 ,  C03C3/06 ,  C03C13/045 ,  C03C17/02 ,  C03C25/68 ,  C03C2201/50

Abstract: One of embodiments relates to an optical fiber in which an alkali metal element is efficiently doped to its core to suppress transmission loss from increasing. A mean concentration or a concentration distribution of the alkali metal element is adjusted such that 0.48 or less is obtained as an weighted value obtained by weighting a distribution of field intensity of guided light at a wavelength of 1550 nm, with respect to a radial direction distribution of a ratio ID2/Iω3 of an intensity ID2 of Raman scattering light by a silica three-membered ring structure and an intensity Iω3 of Raman scattering light by a Si—O stretching vibration, in a cross-sectional region having a diameter of 20 μm.

公开(公告)号：US20170197878A1

公开(公告)日：2017-07-13

申请号：US15471344

申请日：2017-03-28

Applicant: Corning Incorporated

Inventor： Dana Craig Bookbinder ,  Robert Brett Desorcie ,  Hazel Benton Matthews, III ,  Pushkar Tandon

IPC: C03C25/66 ,  G02B6/036 ,  C03C25/10

CPC classification number: C03C25/66 ,  C03B37/01205 ,  C03B37/01446 ,  C03B37/0146 ,  C03B37/027 ,  C03B2201/10 ,  C03B2201/12 ,  C03B2201/20 ,  C03B2201/22 ,  C03B2201/31 ,  C03B2201/32 ,  C03B2201/34 ,  C03B2201/42 ,  C03B2203/23 ,  C03B2203/24 ,  C03C3/06 ,  C03C13/045 ,  C03C25/1061 ,  C03C25/1068 ,  C03C2201/11 ,  C03C2201/22 ,  C03C2201/31 ,  C03C2203/54 ,  G02B6/02 ,  G02B6/021 ,  G02B6/03627 ,  G02B6/0365 ,  Y02P40/57

Abstract: The present disclosure is directed to a method of making an optical fiber with improved bend performance, the optical fiber having a core and at least one cladding layer, and a chlorine content in the in the last layer of the at least one cladding layer that is greater than 500 ppm by weight. The fiber is prepared using a mixture of a carrier gas, a gaseous chlorine source material and a gaseous reducing agent during the sintering of the last or outermost layer of the at least one cladding layer. The inclusion of the reducing gas into a mixture of the carrier gas and gaseous chlorine material reduces oxygen-rich defects that results in at least a 20% reduction in TTP during hydrogen aging testing.

公开(公告)号：US09676658B2

公开(公告)日：2017-06-13

申请号：US14997780

申请日：2016-02-15

Applicant: Corning Incorporated

Inventor： Brian Lee Harper ,  Rostislav Radiyevich Khrapko ,  Snigdharaj Kumar Mishra ,  Sonya Marie Raney ,  Pushkar Tandon

IPC: C03C13/04 ,  C03B37/014

CPC classification number: C03B37/01446 ,  C03B37/014 ,  C03B37/01453 ,  C03B2201/08 ,  C03B2201/12 ,  C03B2201/20 ,  C03B2201/31 ,  C03B2203/22 ,  C03B2203/23 ,  C03B2203/26 ,  C03C13/045 ,  C03C2201/11 ,  C03C2201/20

Abstract: One embodiment of the disclosure relates to a method of making an optical fiber comprising the steps of: (i) exposing a silica based preform with at least one porous glass region having soot density of ρ to a gas mixture comprising SiCl4 having SiCl4 mole fraction ySiCl4 at a doping temperature Tdop such that parameter X is larger than 0.03 to form the chlorine treated preform, wherein X = 1 1 + [ ( ρ ρ s - ρ ) ⁢ 0.209748 ⁢ ⁢ T dop ⁢ Exp ⁡ [ - 5435.33 / T dop ] y SiCl ⁢ ⁢ 4 3 / 4 ] and ρs is the density of the fully densified soot layer; and (ii) exposing the chlorine treated preform to temperatures above 1400° C. to completely sinter the preform to produce sintered optical fiber preform with a chlorine doped region; and (iii) drawing an optical fiber from the sintered optical preform.

公开(公告)号：US20160304388A1

公开(公告)日：2016-10-20

申请号：US15099616

申请日：2016-04-15

Applicant: Shin-Etsu Chemical Co., Ltd.

Inventor： Tetsuya OTOSAKA

IPC: C03B37/025 ,  C03B37/029 ,  C03B37/03

CPC classification number: C03B37/0142 ,  C03B37/01446 ,  C03B37/0146 ,  C03B2201/02 ,  C03B2207/52

Abstract: A porous glass base material sintering method comprising measuring a feeding speed Vf of a porous glass base material and a movement speed Vw of a bottom end of the glass base material; performing a sintering treatment of the porous glass base material presetting, for each feeding distance L of the porous glass base material, a greater-than-1 target value αS (L) of an elongation rate in a straight body portion of the porous glass base material calculated based on a ratio Vw/Vf, and controlling at least one of a temperature of the heating furnace and a feeding speed of the porous glass base material such that a measured value α of the elongation rate of the porous glass base material matches with the target value αS (L).

Abstract translation: 一种多孔玻璃基材烧结方法，包括测量多孔玻璃基材的进料速度Vf和玻璃基材的底端的移动速度Vw; 对于多孔玻璃基材的每个进给距离L，对多孔玻璃基材进行预浸的烧结处理，在多孔玻璃基材的直体部分中的伸长率大于1的目标值αS（L） 基于比率Vw / Vf计算的材料，并且控制加热炉的温度和多孔玻璃基材的进料速度中的至少一个，使得多孔玻璃基材的延伸率的测量值α与 目标值αS（L）。

公开(公告)号：US20160200620A1

公开(公告)日：2016-07-14

申请号：US14916608

申请日：2014-09-11

Applicant: HERAEUS QUARZGLAS GMBH & CO. KG

Inventor： Stefan OCHS

IPC: C03B19/06 ,  C03C3/06 ,  C03B25/02

CPC classification number: C03B19/06 ,  C03B25/02 ,  C03B37/01413 ,  C03B37/01446 ,  C03B2201/075 ,  C03B2201/40 ,  C03C3/06 ,  C03C2203/00

Abstract: A method for producing a blank of iron-doped silica glass with high silicic acid content for use as heat protection glass is provided. The method involves: (a) producing an iron-doped SiO2 soot body which contains iron in a first oxidation state Fe3+ by flame hydrolysis of a silicon-containing and an iron-containing starting substance, (b) drying the soot body to obtain a mean hydroxyl group content of less than 10 ppm by weight, and (c) vitrifying the soot body under a reducing atmosphere that is suitable for at least partially reducing the iron from the first oxidation state Fe3+ to a second, lower oxidation state Fe2+. A blank is obtained having an iron content between 0.1 and 1% by weight which exhibits an internal transmission of at most 40% in the infrared wavelength range and an internal transmission of at least 85% in the visible spectral range.

Abstract translation: 本发明提供一种用于制造具有高硅酸含量的掺铁石英玻璃的坯料作为保温玻璃的方法。 该方法包括：（a）通过含硅和含铁起始物质的火焰水解生产含有第一氧化态Fe 3+的铁的掺铁SiO 2烟灰体，（b）干燥烟灰体以获得 平均羟基含量小于10重量ppm，和（c）在适于将铁从第一氧化态Fe 3+至少部分还原为第二次氧化态Fe2 +的还原气氛下使烟灰体玻璃化。 获得的铁含量为0.1至1重量％的空白，其在红外波长范围内具有至多40％的内部透光率，在可见光谱范围内内透光率至少为85％。