GB2388367A - A process for making rare earth doped optical fibre - Google Patents
A process for making rare earth doped optical fibre Download PDFInfo
- Publication number
- GB2388367A GB2388367A GB0318455A GB0318455A GB2388367A GB 2388367 A GB2388367 A GB 2388367A GB 0318455 A GB0318455 A GB 0318455A GB 0318455 A GB0318455 A GB 0318455A GB 2388367 A GB2388367 A GB 2388367A
- Authority
- GB
- United Kingdom
- Prior art keywords
- core
- solution
- rare earth
- earth doped
- fibres
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title abstract description 10
- 229910052761 rare earth metal Inorganic materials 0.000 title abstract description 3
- 150000002910 rare earth metals Chemical class 0.000 title abstract description 3
- 239000013307 optical fiber Substances 0.000 title 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 6
- 239000000243 solution Substances 0.000 abstract description 6
- 239000004071 soot Substances 0.000 abstract description 4
- 230000001476 alcoholic effect Effects 0.000 abstract description 2
- 239000007864 aqueous solution Substances 0.000 abstract description 2
- 230000015572 biosynthetic process Effects 0.000 abstract description 2
- 230000007547 defect Effects 0.000 abstract description 2
- 230000018044 dehydration Effects 0.000 abstract description 2
- 238000006297 dehydration reaction Methods 0.000 abstract description 2
- 230000008021 deposition Effects 0.000 abstract description 2
- 230000000994 depressogenic effect Effects 0.000 abstract description 2
- 238000007598 dipping method Methods 0.000 abstract description 2
- 239000002019 doping agent Substances 0.000 abstract description 2
- 238000001035 drying Methods 0.000 abstract description 2
- 239000000835 fiber Substances 0.000 abstract description 2
- 230000003647 oxidation Effects 0.000 abstract description 2
- 238000007254 oxidation reaction Methods 0.000 abstract description 2
- 239000000377 silicon dioxide Substances 0.000 abstract description 2
- 238000002791 soaking Methods 0.000 abstract description 2
- 239000000758 substrate Substances 0.000 abstract description 2
- JLDSOYXADOWAKB-UHFFFAOYSA-N aluminium nitrate Chemical compound [Al+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O JLDSOYXADOWAKB-UHFFFAOYSA-N 0.000 abstract 2
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 abstract 2
- YBMRDBCBODYGJE-UHFFFAOYSA-N germanium dioxide Chemical compound O=[Ge]=O YBMRDBCBODYGJE-UHFFFAOYSA-N 0.000 abstract 2
- 150000002500 ions Chemical class 0.000 abstract 1
- 238000005245 sintering Methods 0.000 abstract 1
- 239000011521 glass Substances 0.000 description 4
- HLXHCNWEVQNNKA-UHFFFAOYSA-N 5-methoxy-2,3-dihydro-1h-inden-2-amine Chemical compound COC1=CC=C2CC(N)CC2=C1 HLXHCNWEVQNNKA-UHFFFAOYSA-N 0.000 description 1
- 101100152433 Caenorhabditis elegans tat-1 gene Proteins 0.000 description 1
- 241000283899 Gazella Species 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000002151 riboflavin Substances 0.000 description 1
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
- C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
- C03B37/018—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD] by glass deposition on a glass substrate, e.g. by inside-, modified-, plasma-, or plasma modified- chemical vapour deposition [ICVD, MCVD, PCVD, PMCVD], i.e. by thin layer coating on the inside or outside of a glass tube or on a glass rod
- C03B37/01807—Reactant delivery systems, e.g. reactant deposition burners
- C03B37/01838—Reactant delivery systems, e.g. reactant deposition burners for delivering and depositing additional reactants as liquids or solutions, e.g. for solution doping of the deposited glass
-
- 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
- C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
- C03B37/018—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD] by glass deposition on a glass substrate, e.g. by inside-, modified-, plasma-, or plasma modified- chemical vapour deposition [ICVD, MCVD, PCVD, PMCVD], i.e. by thin layer coating on the inside or outside of a glass tube or on a glass rod
-
- 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
- C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
- C03B37/018—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD] by glass deposition on a glass substrate, e.g. by inside-, modified-, plasma-, or plasma modified- chemical vapour deposition [ICVD, MCVD, PCVD, PMCVD], i.e. by thin layer coating on the inside or outside of a glass tube or on a glass rod
- C03B37/01807—Reactant delivery systems, e.g. reactant deposition burners
-
- 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
- C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
- C03B37/018—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD] by glass deposition on a glass substrate, e.g. by inside-, modified-, plasma-, or plasma modified- chemical vapour deposition [ICVD, MCVD, PCVD, PMCVD], i.e. by thin layer coating on the inside or outside of a glass tube or on a glass rod
- C03B37/01853—Thermal after-treatment of preforms, e.g. dehydrating, consolidating, sintering
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2201/00—Type of glass produced
- C03B2201/06—Doped silica-based glasses
- C03B2201/08—Doped silica-based glasses doped with boron or fluorine or other refractive index decreasing dopant
- C03B2201/12—Doped silica-based glasses doped with boron or fluorine or other refractive index decreasing dopant doped with fluorine
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2201/00—Type of glass produced
- C03B2201/06—Doped silica-based glasses
- C03B2201/20—Doped silica-based glasses doped with non-metals other than boron or fluorine
- C03B2201/28—Doped silica-based glasses doped with non-metals other than boron or fluorine doped with phosphorus
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2201/00—Type of glass produced
- C03B2201/06—Doped silica-based glasses
- C03B2201/30—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi
- C03B2201/31—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi doped with germanium
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2201/00—Type of glass produced
- C03B2201/06—Doped silica-based glasses
- C03B2201/30—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi
- C03B2201/34—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi doped with rare earth metals, i.e. with Sc, Y or lanthanides, e.g. for laser-amplifiers
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2201/00—Type of glass produced
- C03B2201/06—Doped silica-based glasses
- C03B2201/30—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi
- C03B2201/34—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi doped with rare earth metals, i.e. with Sc, Y or lanthanides, e.g. for laser-amplifiers
- C03B2201/36—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi doped with rare earth metals, i.e. with Sc, Y or lanthanides, e.g. for laser-amplifiers doped with rare earth metals and aluminium, e.g. Er-Al co-doped
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geochemistry & Mineralogy (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Lasers (AREA)
- Glass Compositions (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
Abstract
The present invention provides an improved process for making rare earth doped preforms and fibres by a combination of MCVD technique and solution doping method, said method comprising developing matched or depressed clad structure inside a silica glass substrate tube followed by deposition of unsintered particulate layer containing GeO2 and P2O5 for formation of the core and solution doping by soaking the porous soot layer into an alcoholic/aqueous solution of RE-salts containing co-dopants like AlCl3 / Al(NO3)3 in definite proportion, controlling the porosity of the soot, dipping period, strength of the solution and the proportion of the codopants to achieve the desired RE ion concentration in the core and minimise the core clad boundary defects and followed by drying, oxidation, dehydration and sintering of the RE containing porous deposit and collapsing at a high temperature to produce the preform and overladding with silica tubes of suitable dimensions and fibre drawing to produce fibres.
Description
GB 2388367 A continued (72) Inventor(s): Tarun Bandyopadhyay Ranjan Sen
Shyamal Kumar Bhadra Kamal Dasgupta Mukul Chandra Paul (74) Agent and/or Address for Service: A A Thornton & Co 235 High Holborn' LONDON, WC1V 7LE, United Kingdom
(12) INTERNATIONAL APPLICATION PUBLISHED UNDER 1-. THAI ON 1 LOOPTEl ION l MEAI (Tat 1) (19)WorldIntellectualPropertyOrganization International Bureau '__ (43) International Publication Date (10) International Publication Number HAugust2002 (0X.0X.2002)PCT WO 02/060830 Al (51) InternationalPatentClassification:C03B37/Ot8. (IN>. SEN, Ranjan ilNllNi: ('entral Glass and t''eramic E101 S 310G7. CrO213 f,/16 Rcscar.-h Institute. 196. Kaja S.('. Mulik, Calcutta 700 (132 (IN). (21) International Application Number:PC['/INOI/001\14 (74) Agent: GABRIEL, Devadoss, Calab. Kumaran Sagar.
(22) International Filing Date: February 2()UI (0.0.20()1) 84-(', C:6 Lanes Sainik E'arms. New Delhi 110 06 (IN).
(25) Filing Language: English (81) Designated States /nationalj: AK, A(n AL, AM. A'l', Atl.
AZ, BA. BB. H(l, HE. BY. BZ, CA. Clf, CN, CR. Cl1, CZ.
(26) Publication Language: English r)ln OK. DM, DZ. FE. ES, Fl. GB. GD, Gl', GH, GM. HR.
IlU,0),M,lN.IS.JP,KE.KO,KP,KR.K/.LC.l.K,l.R. I S. 1'1', 1.11, 1.\1, MA. MD' M(J. MK. MN, MW. M\, MZ
(71) Applicants valor all designated Stale. except INS): MIN-,rK,T,r. Tz lEJl; RO. Rl), SD, SE. SG Sl, SK. Sl. l'J, TM.
Scope Complex, Lodhi Road, New Delhi 110 003 (IN).
COUNCIL OF SCIENTIFIC AND INDUSTRL\L RE
SEARCH flNlih;-l; Ran Marg, 110 001 New Delhi (1) (84) Designated States (regional/: ARIPO patent ((ill. CiM, BHADRA, Shyamal. Kumar IINm9]; Ceutra1 Glass and OF, IS. MVv, MZ, Sly). Sly,. SZ, TZ, ITG, ZWh Eurasian (2eramic Research Institute, 196. Raja S C. Mulik. Calcutta patent (AM, A; [, t3 Y. KG. KZ. MD, RU, 'I'J, I'M), European 7()()032 (INK DASGUPTA, Kamal IINIINi: Central Glass patent (A'l', BE, Cll. CY, DE. OK, ES. 1'1. t R. OH. OR. [E, and Ceramic Research Institute, 196. Raja S.C. Mulik, ('al- IJ'. Lll. MC. NL, P'l: SE, 'I'R), OAPI patent (BI-: BJ, Cl.
curia 70() 03 (IN). PALiL, Mu kul, Cha ndra I IN/II': Cen- ('(i, Cl, ('M, GA. ON. GW. ML. MR. NF..SN. 1'1), 'I G! tral Glass and Ceramic Research Institute, 196. Raja S.C.
Mulik. (Calcutta 700 032 (IN). Published: with international search report (72) Inventors; and (75) Inventors/Applicants rJor l 'S only): BANDVOPAD- For two-lelter codes and other abbreviations. refer tc> the "C; ud HYAY, Tarun l[NIII4I. Central Glass and ('eratnic ance. \rotesonC'odesand.4bbrevianons' appearingalthebe,gin Research Institute. 196. Raja S.C2. Mulik. (2alcotta 700 ()3 ning of each regular issue of the PC7 Gazelle i 1\ O (54) Title: A PROCESS FOR MAKIN('RARF. t.AR'I'}I DOPED OPTI(:AI FlBRt' X O (57) Abstract: The present invention provides an improved process for making rare earth doped preforms and fibres by a combi-
0 nation of M('VD technique and solution doping method, said method comprising developing matched or depressed clad structure inside a silica glass substrate tube followed by deposition of unsiniered particulate layer containing Gc02 and P205 for formation of O the core and solution doping by soaking the porous soot lays r into an alcoholic/aqueous solution of Rt.-salts containing co-dopants like A]C'I I AItNO3)3 in definite proportion, controlling the porosity of the soot, dipping period. strength of the solution and the O proportion of the codopants to achieve the desired Rli. ion concentration in the cure and minimise the core clad bc>undary defects and iollcwed by drying. oxidation, dehydration and sintenng of the HE containing porous deposit and collapsing at a high temperature to produce the preform and overladding with silica tubes of suitable dimensions and fibre drawing to prc>duce fibres
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/IN2001/000014 WO2002060830A1 (en) | 2001-02-02 | 2001-02-02 | A process for making rare earth doped optical fibre |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB0318455D0 GB0318455D0 (en) | 2003-09-10 |
| GB2388367A true GB2388367A (en) | 2003-11-12 |
| GB2388367B GB2388367B (en) | 2005-05-18 |
Family
ID=11076302
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0318455A Expired - Lifetime GB2388367B (en) | 2001-02-02 | 2001-02-02 | A process for making rare earth doped optical fibre |
Country Status (6)
| Country | Link |
|---|---|
| KR (1) | KR100655480B1 (en) |
| CN (1) | CN1274618C (en) |
| AU (1) | AU2001242728B2 (en) |
| CA (1) | CA2436579C (en) |
| GB (1) | GB2388367B (en) |
| WO (1) | WO2002060830A1 (en) |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040112089A1 (en) * | 2002-12-16 | 2004-06-17 | Digiovanni David J. | Manufacture of optical fibers using enhanced doping |
| CA2454896A1 (en) * | 2003-01-16 | 2004-07-16 | Sumitomo Electric Industries, Ltd. | Method of producing optical fiber preform, and optical fiber preform and optical fiber produced with the method |
| CN101479205B (en) * | 2006-06-26 | 2013-02-20 | 住友电气工业株式会社 | Process for producing optical fiber base, process for producing optical fiber, and optical fiber |
| JP5018492B2 (en) * | 2008-01-15 | 2012-09-05 | 住友電気工業株式会社 | Preform manufacturing method |
| FR2939522B1 (en) * | 2008-12-08 | 2011-02-11 | Draka Comteq France | OPTICAL FIBER AMPLIFIER RESISTANT TO IONIZING RADIATION |
| CN102086089A (en) * | 2010-12-27 | 2011-06-08 | 富通集团有限公司 | Method for manufacturing rare-earth-doped fiber precast rod |
| CN102515501B (en) * | 2011-11-29 | 2014-04-30 | 富通集团有限公司 | Method for manufacturing doped optical fibre preform by MCVD (modified chemical vapour deposition) |
| CN104058587B (en) * | 2014-07-14 | 2016-06-22 | 富通集团有限公司 | A kind of rare earth doped optical fibre prefabricated rods and preparation method thereof |
| CN106966581A (en) * | 2017-05-18 | 2017-07-21 | 江苏亨通光导新材料有限公司 | A kind of preform and preparation method thereof |
| CN110467342A (en) * | 2019-08-15 | 2019-11-19 | 武汉长进激光技术有限公司 | A kind of ultra wide band gain Er-doped fiber and preparation method thereof |
| CN110467343A (en) * | 2019-08-23 | 2019-11-19 | 武汉长进激光技术有限公司 | A kind of nano-porous glass material hydroxyl-removal sintering method |
| CN110510864A (en) * | 2019-09-11 | 2019-11-29 | 烽火通信科技股份有限公司 | The preparation method and preform of highly doped rare-earth-doped fiber precast rod |
| US11673831B2 (en) * | 2019-10-01 | 2023-06-13 | The Hong Kong University Of Science And Technology | Method for preparing optical fibers with high-particle-coated porous polymeric outer coating layers |
| CN111847864A (en) * | 2020-06-16 | 2020-10-30 | 武汉长进激光技术有限公司 | C-band expanded broadband gain erbium-doped optical fiber and preparation method thereof |
| CN115448590A (en) * | 2022-08-31 | 2022-12-09 | 长飞光纤光缆股份有限公司 | Method for preparing rare earth doped optical fiber preform by in-tube method |
| CN118026517A (en) * | 2024-01-31 | 2024-05-14 | 武汉长进光子技术股份有限公司 | Solution doping device and doping method for preparing optical fiber preform |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0451293A1 (en) * | 1989-10-31 | 1991-10-16 | Fujitsu Limited | Production method for optical fiber base material |
| EP0466932A1 (en) * | 1990-02-05 | 1992-01-22 | The Furukawa Electric Co., Ltd. | Quartz glass doped with rare earth element and production thereof |
| EP1043281A1 (en) * | 1999-04-09 | 2000-10-11 | Spectran Corporation | Method of fabricating preforms doped with rare earth metal for optical fibers |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5005175A (en) | 1989-11-27 | 1991-04-02 | At&T Bell Laboratories | Erbium-doped fiber amplifier |
| JP2766420B2 (en) | 1992-04-07 | 1998-06-18 | 株式会社フジクラ | Method for producing erbium-doped quartz |
| GB2273389B (en) | 1992-12-14 | 1996-07-17 | Pirelli Cavi Spa | Rare earth doped optical fibre amplifiers |
| JP3773575B2 (en) | 1996-01-12 | 2006-05-10 | 富士通株式会社 | Doped fiber, splicing method thereof, and optical amplifier |
-
2001
- 2001-02-02 GB GB0318455A patent/GB2388367B/en not_active Expired - Lifetime
- 2001-02-02 KR KR1020037010252A patent/KR100655480B1/en active IP Right Grant
- 2001-02-02 CA CA002436579A patent/CA2436579C/en not_active Expired - Lifetime
- 2001-02-02 AU AU2001242728A patent/AU2001242728B2/en not_active Expired
- 2001-02-02 WO PCT/IN2001/000014 patent/WO2002060830A1/en active IP Right Grant
- 2001-02-02 CN CNB018230083A patent/CN1274618C/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0451293A1 (en) * | 1989-10-31 | 1991-10-16 | Fujitsu Limited | Production method for optical fiber base material |
| EP0466932A1 (en) * | 1990-02-05 | 1992-01-22 | The Furukawa Electric Co., Ltd. | Quartz glass doped with rare earth element and production thereof |
| EP1043281A1 (en) * | 1999-04-09 | 2000-10-11 | Spectran Corporation | Method of fabricating preforms doped with rare earth metal for optical fibers |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2436579C (en) | 2006-09-26 |
| WO2002060830A1 (en) | 2002-08-08 |
| GB2388367B (en) | 2005-05-18 |
| KR100655480B1 (en) | 2006-12-08 |
| KR20040034595A (en) | 2004-04-28 |
| CA2436579A1 (en) | 2002-08-08 |
| CN1274618C (en) | 2006-09-13 |
| WO2002060830A8 (en) | 2003-11-20 |
| CN1500069A (en) | 2004-05-26 |
| GB0318455D0 (en) | 2003-09-10 |
| AU2001242728B2 (en) | 2007-05-10 |
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