WO2003018493A1 - Procede de production d'un support en fibre optique - Google Patents
Procede de production d'un support en fibre optique Download PDFInfo
- Publication number
- WO2003018493A1 WO2003018493A1 PCT/JP2002/008486 JP0208486W WO03018493A1 WO 2003018493 A1 WO2003018493 A1 WO 2003018493A1 JP 0208486 W JP0208486 W JP 0208486W WO 03018493 A1 WO03018493 A1 WO 03018493A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- glass
- pipe
- optical fiber
- rod
- glass pipe
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/01205—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments
- C03B37/01225—Means for changing or stabilising the shape, e.g. diameter, of tubes or rods in general, e.g. collapsing
- C03B37/0124—Means for reducing the diameter of rods or tubes by drawing, e.g. for preform draw-down
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
Definitions
- a glass rod for a core or a glass opening for a core and a cladding is inserted into a glass pipe for a cladding, and the inside of the glass pipe is decompressed while heating both of the cores.
- the present invention relates to a method for manufacturing an optical fiber preform that simultaneously integrates with a glass head and extends the glass fiber.
- the main methods for manufacturing optical fiber preforms include the following three methods: OVD (Outside Vapor-phase Deposition), VAD (Vapor-phase Axial Deposition), and MCVD (Modified Chemical Vapor Deposition).
- OVD Outside Vapor-phase Deposition
- VAD Vapor-phase Axial Deposition
- MCVD Modified Chemical Vapor Deposition
- a large part of the optical fiber preform is occupied after the core or the core and the glass opening for the clad are manufactured.
- a method of forming a clad on the outer periphery of the glass opening by a separate process is employed.
- a so-called external method is known in which glass fine particles called soot are deposited on the above-mentioned glass opening and heated to form a transparent glass. ing.
- the core or the core and the glass opening for the clad are inserted into the glass pipe for the cladding manufactured in advance in a separate process, and the glass pipe and the glass rod are integrated into a so-called opening.
- the Addin tube method is known (for example, see Japanese Patent Publication No. 56-45867).
- the glass pipe and the glass opening are heated by a Pana flame, and the glass pipe is heated to a core opening by the gas of the Pana flame.
- a method is known in which the two are integrated by pressing them against a pad.
- the glass pipe and the glass rod are sequentially heated from one end to the other end by a heating furnace or the like in a state where the pressure in the glass pipe is reduced, so that the inside and outside of the glass pipe are heated.
- a method is also known in which the two are sequentially integrated from one end to the other end by the pressure difference.
- the optical fiber preform manufactured by the above-described manufacturing method is turned into an optical fiber by a drawing process.
- a method in which this drawing process is performed simultaneously with the manufacturing of the optical fiber preform by the above-mentioned open-din tube method Is also known (for example, see Japanese Patent Application Laid-Open No. 50-85345).
- the optical fiber preform is usually stretched to reduce the diameter of the manufactured large-diameter optical fiber preform to an optimal diameter that maximizes the yield before the drawing process. I am trying to do it.
- the process of stretching the optical fiber preform is performed at the same time as the production of the optical fiber preform by integrating the glass pipe and the glass opening to improve the productivity.
- a method is known (for example, see Japanese Patent Application Laid-Open No. 7-180580).
- the inventor of the present invention produced a large and long optical fiber preform using a large-diameter and long glass pipe and a correspondingly long glass port. At that time, the optical fiber preform had a large core eccentricity.
- This increase in the core eccentricity is due to the fact that the heating furnace is large and has a large output (for example, the furnace has an outer diameter of 100 mm and an inner diameter of 22 It is considered that this was caused by the combination of the setting of 0 mm and output of 700 kVA) and the bending of the glass opening caused by the long glass rod. 'In other words, in such a large heating furnace, the heat easily escapes from the upper end opening of the heating furnace, so that the temperature of the outer surface of the glass pipe tends to decrease. If the temperature of the outer surface of the glass pipe decreases, the outer surface of the manufactured optical fiber preform becomes rough. Therefore, when using a large heating furnace, the output is set higher than the output required to integrate the glass pipe and the glass mouth, so that the outer surface of the glass pipe is kept at a high temperature. .
- the optical fiber motherboard can be used. No eccentricity of the core in the material occurs.
- the diameter of the glass pipe is uniformly reduced in the circumferential direction when it is integrated, so if there is no bend in the glass slot, the glass pipe contacts the glass mouth evenly in the circumferential direction. I will be. For this reason, the two are integrated with the glass rod positioned at the center position of the glass pipe, and as a result, the eccentricity of the core in the optical fiber preform does not occur.
- the holding means positions the glass opening in the glass pipe and allows the glass rod to be introduced into the heating furnace.
- the bending amount becomes large.
- the present invention has been made in view of such circumstances, and has as its object.
- an object is to produce an optical fiber preform in which the eccentricity of the core is suppressed. Disclosure of the invention
- the present invention provides a surface tension for pulling molten glass of a glass rod toward a glass pipe by applying tension in a longitudinal direction of the glass rod when the glass pipe and the glass rod are integrated. And tried to oppose it.
- a glass opening for a core or a glass opening for a core and a glass is inserted into a glass pipe for a cladding, and the glass pipe is heated while being heated by a heating furnace.
- the present invention is directed to a method for producing an optical fiber preform in which the inside is decompressed and the glass pipe and the glass port are simultaneously integrated and drawn.
- the glass pipe and the glass rod are integrated with each other in a state where tension is applied in the longitudinal direction of the glass rod.
- the glass pipe and the glass head are integrated, only a part of the glass pipe in the circumferential direction comes into contact with the glass head, and the molten glass in the glass head becomes molten.
- the surface tension can be countered by the longitudinal tension acting on the glass rod. That is, the glass rod can be biased by the tension applied in the longitudinal direction of the glass rod so that the glass rod is positioned at the center of the glass pipe. In this state, by integrating the glass pipe and the glass rod, it is possible to prevent the eccentricity of the core from increasing and to minimize the amount of eccentricity.
- a large-sized and high-power heating furnace is used, and for example, a large-diameter glass pipe with an outer diameter of 150 mm or more, and a large-diameter glass port with an outer diameter of 35 mm or more. Even when an optical fiber preform is manufactured using a head, an optical fiber preform can be manufactured while suppressing core eccentricity.
- the glass pipe and the glass rod are first integrated, in other words, when the glass pipe and the glass opening are integrated.
- the glass opening head is located at the center of the glass pipe. If the above-mentioned glass port is shifted from the center position of the glass pipe at the end where the glass pipe and the glass port start to be integrated, even if the glass rod is tensioned in the longitudinal direction of the glass rod, The rod is biased in a position that is not centered on the glass pipe.
- the feeding speed of the glass rod to the heating furnace may be adjusted to a speed lower than the feeding speed of the glass pipe.
- the glass pipe and the glass mouth are integrated together.
- the glass rod feed speed is lower than the glass pipe feed speed. Is pulled in the longitudinal direction by the glass pipe.
- tension in the longitudinal direction of the glass rod it is possible to apply tension in the longitudinal direction of the glass rod.
- feed speed V R of the glass outlet head is the feed speed of the glass pipe to come to have a V P, 0.
- the cross-sectional area of the above glass pipe and glass mouth is It is preferable to set a predetermined core / cladding ratio when the mouth and the head are integrated.
- the core-to-cladding ratio (hereinafter also referred to as C / C) is a value obtained by dividing the cladding diameter in the optical fiber preform by the core diameter.
- the feeding speed of the glass rod to the heating furnace is adjusted to a speed lower than the feeding speed of the glass pipe, compared to the case where the glass rod and the glass pipe are sent at the same speed, the speed per unit time is reduced.
- the feed rate of the glass mouth drops relatively to the feed rate of the glass pipe. Therefore, when the glass pipe and the glass head are integrated, the cross-sectional area of the glass head becomes relatively smaller than the cross-sectional area of the glass pipe, and C / C in the completed optical fiber preform is reduced. However, it does not become the predetermined c Z c.
- the feeding speed of the glass opening is made higher than the feeding speed of the glass pipe. Even if it is late, the glass pipe and the glass rod are integrated with the specified C / C.
- the cross-sectional area of the glass rod may be set to be larger than when the feed speed of the glass pipe and the feed speed of the glass rod are the same.
- the following inventions are inventions that enable production of a more precise optical fiber preform.
- the glass rod is divided in the longitudinal direction so that the cutoff wavelength of the drawn optical fiber is set to a desired value. Then, the target CZC suitable for the structure of the divided glass rod is obtained, and the manufacturing process is individually adjusted for each divided glass opening so that the optical fiber preform is finished to the value. That is, a glass rod with a large core diameter or a glass rod with a small cZc If there is a part, if the glass pipe and the glass rod are integrated at the same feed rate, the C / C of the manufactured optical fiber preform reflects the structural variation of the glass port in the longitudinal direction. It will change in shape.
- the feed speed of the glass rod may be adjusted so that the glass pipe and the glass rod are integrated in the longitudinal direction at a desired core-cladding ratio.
- the glass pipe and the glass head can be formed as desired. It is integrated so that c Z c.
- the czc increases from the end where the integration starts to the end where the integration ends.
- the feed speed of the glass head is finely adjusted to increase as the integration progresses, an optical fiber with the desired czc in the longitudinal direction can be obtained.
- a base material is manufactured.
- An optical fiber drawn from a large optical fiber preform that has been treated in this manner has a stable cutoff wavelength in the longitudinal direction, improving the yield of the optical fiber and reducing the cost.
- the production of optical fiber is realized.
- the core diameter of the glass rod, the refractive index difference between the core and the clad, or the length of c Z c The amount of change in the direction may be measured or predicted, and the feed rate of the glass rod may be controlled by a control program based on this. If the difference in the refractive index between the core of the glass rod and the clad is uniform in the longitudinal direction, C / C is measured during the integration of the two, and the glass is measured based on the measured value. Feedback control for controlling the feed speed of the mouth may be performed. The feed speed of the glass pipe may be controlled instead of the glass rod.
- the longitudinal central axis of the optical fiber preform can be obtained. Since the axial symmetry with respect to is improved, the amount of eccentricity of the core is further reduced. Also, this core eccentricity With further reduction, polarization dispersion characteristics are improved, and an optical fiber preform from which a more accurate optical fiber can be obtained is manufactured.
- FIG. 1 is an explanatory perspective view showing a state in which an optical fiber preform is being manufactured.
- Figure 1 shows the state of the optical fiber preform during manufacture
- 1 is a glass pipe for cladding
- 2 is a glass rod for core or core and cladding
- 3 is the above glass pipe 1 and glass port 2 Is a heater for heating both.
- the glass pipe 1 for example, a glass pipe manufactured by an OVD method or the like may be used.
- the above glass rod 2 is manufactured by sintering a glass fine particle deposit on which glass fine particles are deposited by the VAD method, and then stretching it, or forming a solid core by forming a core glass on the inner surface of the cladding pipe by the MCVD method. What should be done.
- the heating furnace provided with the heater 3 specifically, a carbon resistance heating furnace / a high-frequency induction heating furnace may be used.
- each of the glass pipe 1 and the glass rod 2 is gripped by a gripping device (not shown) via an auxiliary pipe and an auxiliary rod (not shown).
- This gripping device is configured to rotate the glass rod 2 around its longitudinal axis. This makes it possible to integrate the glass rod 2 with the glass pipe 1 while rotating the glass rod 2 as necessary.
- the gripping device is configured to move the glass pipe 1 and the glass rod 2 downward, respectively, and to send the glass pipe 1 and the glass rod 2 into the heater 3. Gripping device, the moving speed of the glass pipe 1 and Garasuro' de 2, i.e. the feed rate to the heater 3, the glass pipe 1 and the glass outlet head 2 in different velocity (V P, V R) to (See arrows in Figure 1).
- the feed speeds V P and V R of the glass pipe 1 and the glass mouth 2 are determined by the outer diameter of the glass rod 2 and the C / C of the glass rod 2 or the difference in the refractive index between the core and the clad. Control is performed by a control program that is set up based on the measured value of the change amount in the longitudinal direction.
- the inside of the glass pipe 1 is connected to an exhaust device (not shown), and the inside of the glass pipe 1 is configured to be depressurized by operating the exhaust device. Further, the optical fiber preform 4 in which the glass pipe 1 and the glass rod 2 are integrated is configured to be taken up by a take-up device (not shown) provided below the preform. Thus, the optical fiber preform 4 is stretched (see the arrow in FIG. 1). In this way, the unification of the glass pipe 1 and the glass rod 2 and the stretching of the optical fiber preform 4 in which the glass pipe 1 and the glass rod 2 are integrated are simultaneously performed.
- the glass rod 2 is inserted into the glass pipe 1 with the catching pipe and the auxiliary rod joined to the upper ends of the glass pipe 1 and the glass rod 2 held by a holding device. Then, a lid that can be connected to the exhaust device is set above the glass pipe 1 (auxiliary pipe). Thus, the glass rod 2 is held coaxially with the glass pipe 1 so as to be slidable in a through hole provided in the center of the lid.
- the glass pipe 1 and the glass rod 2 are respectively moved downward while depressurizing the inside of the glass pipe 1 by an exhaust device (see the arrow in FIG. 1).
- the feed speed V R of Garasuro' de 2 is controlled to be slower than the feed speed V P of the glass pipe 1.
- the feed speed V R is finely adjusted, the glass Supaipu 1 and Garasuro' de 2 When they are integrated, they have a predetermined C / C. In this way, the lower ends of the glass pipe 1 and the glass opening 2 are introduced into the heater 3, whereby the lower ends of the two 1 and 2 are heated by the heater 3. .
- the lower end of the glass pipe 1 is melted, and the diameter is reduced by a pressure difference between the inside and the outside, whereby the glass pipe 1 is integrated with the glass rod 2.
- the glass pipe 1 and the glass rod 2 that have started to be integrated are sent further downward, so that the glass pipe 1 and the glass rod 2 are sequentially heated in the longitudinal direction from the lower end to the upper end. Become.
- the glass pipe 1 and the glass rod 2 are sequentially integrated from the lower end to the upper end.
- the integrated optical fiber preform 4 is drawn by being pulled by a pulling device. In this way, the unification and extension of the glass pipe 1 and the glass mouth 2 are simultaneously performed, and the optical fiber preform 4 is manufactured.
- the feeding speed V R of the glass rod 2 is changed to the feeding speed of the glass pipe 1.
- V P the feeding speed of the glass pipe 1.
- the glass rod 2 when the glass rod 2 is bent, when the diameter of the glass pipe 1 is reduced, only a part of the glass pipe 1 in the circumferential direction comes into contact with the glass rod 2, and the glass rod 2 comes into contact.
- the molten glass of the rod 2 is pulled toward the glass pipe by its surface tension.
- the glass rod 2 since the glass rod 2 is given a tension in its longitudinal direction, Can resist surface tension.
- the glass rod 2 is biased to be positioned at the center of the glass pipe 1. In this state, since the glass pipe 1 and the glass rod 2 are integrated, the amount of eccentricity of the core in the optical fiber 4 is minimized.
- a large-sized and high-power heating furnace is used, for example, by a large-diameter glass pipe 1 having an outer diameter of 150 mm or more and a large-diameter glass rod 2 having an outer diameter of 35 mm or more. Even when the optical fiber preform 4 is manufactured, the optical fiber preform 4 can be manufactured while suppressing the eccentricity of the core.
- the above-mentioned glass port 2 is required at the end where the glass pipe 1 and the glass rod 2 start to be integrated. It is important that is located in the center of the glass pipe 1.
- the glass opening 2 is radially displaced from the center position of the glass pipe 1 at the end where the glass pipe 1 and the glass rod 2 start to be integrated, in other words, the glass pipe 1
- the core is eccentric when the glass rod 2 is first integrated with the glass rod 2
- the glass rod 2 moves to the center of the glass pipe 1 even if tension is applied in the longitudinal direction of the glass opening 2.
- the glass rod 2 is biased at a position shifted from the center position of the glass pipe 1.
- the eccentricity of the core can be prevented from further increasing as the integration of the glass pipe 1 and the glass mouth 2 progresses, but when the glass pipe 1 and the glass rod 2 are first integrated, The resulting eccentricity of the core cannot be reduced.
- the feed speed V R of the glass rod 2 needs to be adjusted so that a tension that does not break the glass rod 2 acts on the glass rod 2. It is preferable to set, for example, 0.9 ⁇ V R ZV P ⁇ 1.0.
- the feed rate V R of Garasuro' de 2 also slow Ri by feeding speed V P of the glass pipe 1
- the feed amount of Garasuro' de 2 per unit time is relatively lowered with respect to the feed amount of Garasupai flop 1 I do. Therefore, when the glass pipe 1 and the glass rod 2 are integrated, the cross-sectional area of the glass rod 2 becomes relatively smaller than the cross-sectional area of the glass pipe 1.
- the C / C in the completed optical fiber preform 4 may not be the predetermined C / C. Therefore, it is preferable to set the cross-sectional areas of the glass pipe 1 and the glass rod 2 in advance in consideration of a reduction in the feed amount of the glass rod 2. In this way, the feed speed V R of Garasuro' de 2 be slower than the feed velocity V P of the glass pipe 1, at a predetermined CZC, can Rukoto are integrated with the glass pipe 1 and Garasuro' de 2 .
- the glass rod 2 CZC or when the refractive index difference between core and clad and has changed to the long side direction, by the control to Gensa slightly the feed velocity V R of this Garasuro' de 2, the desired The optical fiber preform 4 that has become the CZC can be manufactured.
- the axial symmetry of the optical fiber preform 4 with respect to the central axis in the longitudinal direction is improved, and the optical fiber preform 4 is improved.
- Core eccentricity can be further reduced.
- the present invention is not limited to the above-described embodiment, but includes various other embodiments. That is, in the above embodiment, as the control of the feed speed V R of Garasuro' de 2, sets the advance control program, but as Gosuru by connexion system to, not limited to this, for example, a glass pipe 1 during the integration of the glass outlet head 2 by measuring the core diameter, it may perform feedback control for controlling the velocity V R feed based on the core diameter was the measurement. Further, in the above-described embodiment, the glass opening 2 is rotated. However, the present invention is not limited to this. For example, the glass pipe 1 may be rotated.
- both the glass pipe 1 and the glass rod 2 may be rotated.
- Table 1 shows an example in which the optical fiber preform 4 was manufactured by setting the feed rate V R of the glass rod 2 (VAD rod) for the core and the clad to be lower than the feed rate V P of the glass pipe 1 (pipe).
- V R of the glass rod 2 VAD rod
- V P of the glass pipe 1 pipe
- the optical fiber preform 4 in which the glass pipe 1 and the glass rod 2 are integrated is stretched until the outer diameter of the optical fiber preform 4 becomes 60 mm in both the working example and the comparative example (stretched preform outer diameter).
- the core eccentricity of the optical fiber preform 4 was 0.3 mm in the comparative example, whereas the core eccentricity of the optical fiber preform 4 was 0.1 mm in the example. I have. That is, in the embodiment in which the tension is applied in the longitudinal direction of the glass rod 2 by reducing the feed speed V R of the glass rod 2, the glass rod 2 is moved by the tension applied in the longitudinal direction of the glass rod 2. It is considered that the position was biased at the center position of the pipe 1, and as a result, the eccentricity of the core was suppressed.
- the manufacturing method of the optical fiber preform according to the present invention in which the glass pipe 1 and the glass rod 2 are integrated and stretched by applying tension in the longitudinal direction of the glass rod 2, the eccentricity of the core is reduced. It can be said that it is possible to manufacture a large-sized optical fiber preform with a decrease.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020047002308A KR100964548B1 (ko) | 2001-08-22 | 2002-08-22 | 광섬유 모재의 제조방법 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001-251374 | 2001-08-22 | ||
JP2001251374A JP4450533B2 (ja) | 2001-08-22 | 2001-08-22 | 光ファイバ母材の製造方法 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003018493A1 true WO2003018493A1 (fr) | 2003-03-06 |
Family
ID=19080031
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2002/008486 WO2003018493A1 (fr) | 2001-08-22 | 2002-08-22 | Procede de production d'un support en fibre optique |
Country Status (4)
Country | Link |
---|---|
JP (1) | JP4450533B2 (ja) |
KR (1) | KR100964548B1 (ja) |
CN (1) | CN1282618C (ja) |
WO (1) | WO2003018493A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013004987A1 (en) * | 2011-07-01 | 2013-01-10 | Ceravision Limited | Glass tube |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5345352B2 (ja) * | 2008-08-04 | 2013-11-20 | 株式会社フジクラ | 光ファイバ用母材の製造方法 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH08277138A (ja) * | 1995-04-04 | 1996-10-22 | Mitsubishi Cable Ind Ltd | 光ファイバ用ガラス母材の製造方法 |
JP2001019454A (ja) * | 1999-07-05 | 2001-01-23 | Mitsubishi Cable Ind Ltd | 光ファイバ母材の製造方法 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000078686A1 (fr) * | 1999-06-22 | 2000-12-28 | Mitsubishi Cable Industries, Ltd. | Procédé de fabrication de matière première pour fibre optique |
KR200213925Y1 (ko) * | 2000-08-28 | 2001-02-15 | 노영호 | 차단공간으로 동력을 부여하는 회전장치 |
-
2001
- 2001-08-22 JP JP2001251374A patent/JP4450533B2/ja not_active Expired - Fee Related
-
2002
- 2002-08-22 WO PCT/JP2002/008486 patent/WO2003018493A1/ja active Application Filing
- 2002-08-22 KR KR1020047002308A patent/KR100964548B1/ko not_active IP Right Cessation
- 2002-08-22 CN CNB02816282XA patent/CN1282618C/zh not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH08277138A (ja) * | 1995-04-04 | 1996-10-22 | Mitsubishi Cable Ind Ltd | 光ファイバ用ガラス母材の製造方法 |
JP2001019454A (ja) * | 1999-07-05 | 2001-01-23 | Mitsubishi Cable Ind Ltd | 光ファイバ母材の製造方法 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013004987A1 (en) * | 2011-07-01 | 2013-01-10 | Ceravision Limited | Glass tube |
Also Published As
Publication number | Publication date |
---|---|
CN1545489A (zh) | 2004-11-10 |
JP4450533B2 (ja) | 2010-04-14 |
KR100964548B1 (ko) | 2010-06-21 |
CN1282618C (zh) | 2006-11-01 |
JP2003054973A (ja) | 2003-02-26 |
KR20040036716A (ko) | 2004-04-30 |
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