LT3572B - A wide band optical amplifier - Google Patents

A wide band optical amplifier Download PDF

Info

Publication number: LT3572B
Authority: LT; Lithuania
Prior art keywords: core; fiber; sections; amplifier; cores
Prior art date: 1990-02-07

Application number

LTIP1607A

Other languages

English (en)

Lithuanian (lt)

Inventor

Giorgio Grasso

Paul Lawrence Scrivener

Original Assignee

Pirelli Cavi Spa

Priority date (The priority date 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 date listed.)

1990-02-07

Filing date

1993-12-15

Publication date

1995-12-27

1993-12-15 Application filed by Pirelli Cavi Spa filed Critical Pirelli Cavi Spa

1995-07-25 Publication of LTIP1607A publication Critical patent/LTIP1607A/xx

1995-12-27 Publication of LT3572B publication Critical patent/LT3572B/lt

Links

230000003287 optical effect Effects 0.000 title claims abstract description 21
239000000835 fiber Substances 0.000 claims abstract description 133
239000013307 optical fiber Substances 0.000 claims abstract description 32
230000005540 biological transmission Effects 0.000 claims abstract description 31
229910052691 Erbium Inorganic materials 0.000 claims abstract description 27
UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 claims abstract description 27
230000003321 amplification Effects 0.000 claims abstract description 17
238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 17
230000005855 radiation Effects 0.000 claims description 51
239000000463 material Substances 0.000 claims description 39
238000005275 alloying Methods 0.000 claims description 31
238000004891 communication Methods 0.000 claims description 29
230000009977 dual effect Effects 0.000 claims description 12
230000031700 light absorption Effects 0.000 claims description 12
238000009825 accumulation Methods 0.000 claims description 9
239000000654 additive Substances 0.000 claims description 7
XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 5
239000011248 coating agent Substances 0.000 claims description 5
238000000576 coating method Methods 0.000 claims description 5
239000011651 chromium Substances 0.000 claims description 4
238000013016 damping Methods 0.000 claims description 4
239000002019 doping agent Substances 0.000 claims description 4
238000001228 spectrum Methods 0.000 claims description 4
230000000996 additive effect Effects 0.000 claims description 3
229910052804 chromium Inorganic materials 0.000 claims description 3
229910052742 iron Inorganic materials 0.000 claims description 3
229910052719 titanium Inorganic materials 0.000 claims description 3
239000010936 titanium Substances 0.000 claims description 3
229910052720 vanadium Inorganic materials 0.000 claims description 3
VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 2
RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 2
230000002596 correlated effect Effects 0.000 claims description 2
LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims description 2
230000002269 spontaneous effect Effects 0.000 abstract description 11
230000000875 corresponding effect Effects 0.000 description 12
230000007704 transition Effects 0.000 description 8
150000002500 ions Chemical class 0.000 description 7
239000004065 semiconductor Substances 0.000 description 6
238000010586 diagram Methods 0.000 description 5
229910052738 indium Inorganic materials 0.000 description 5
229910052785 arsenic Inorganic materials 0.000 description 4
229910052733 gallium Inorganic materials 0.000 description 4
229910052710 silicon Inorganic materials 0.000 description 4
238000003860 storage Methods 0.000 description 4
XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
230000002238 attenuated effect Effects 0.000 description 3
238000002189 fluorescence spectrum Methods 0.000 description 3
238000004519 manufacturing process Methods 0.000 description 3
239000012783 reinforcing fiber Substances 0.000 description 3
239000010703 silicon Substances 0.000 description 3
XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
238000010521 absorption reaction Methods 0.000 description 2
239000003795 chemical substances by application Substances 0.000 description 2
238000009826 distribution Methods 0.000 description 2
VQCBHWLJZDBHOS-UHFFFAOYSA-N erbium(III) oxide Inorganic materials O=[Er]O[Er]=O VQCBHWLJZDBHOS-UHFFFAOYSA-N 0.000 description 2
230000005284 excitation Effects 0.000 description 2
230000005281 excited state Effects 0.000 description 2
238000001914 filtration Methods 0.000 description 2
230000001902 propagating effect Effects 0.000 description 2
230000003595 spectral effect Effects 0.000 description 2
241000209510 Liliopsida Species 0.000 description 1
230000002745 absorbent Effects 0.000 description 1
239000002250 absorbent Substances 0.000 description 1
239000011358 absorbing material Substances 0.000 description 1
239000000956 alloy Substances 0.000 description 1
229910045601 alloy Inorganic materials 0.000 description 1
229910052782 aluminium Inorganic materials 0.000 description 1
229910052786 argon Inorganic materials 0.000 description 1
230000001276 controlling effect Effects 0.000 description 1
238000000354 decomposition reaction Methods 0.000 description 1
230000007423 decrease Effects 0.000 description 1
230000000694 effects Effects 0.000 description 1
238000005516 engineering process Methods 0.000 description 1
230000004992 fission Effects 0.000 description 1
230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
239000003292 glue Substances 0.000 description 1
230000005283 ground state Effects 0.000 description 1
230000005764 inhibitory process Effects 0.000 description 1
238000009434 installation Methods 0.000 description 1
230000002452 interceptive effect Effects 0.000 description 1
238000005304 joining Methods 0.000 description 1
238000000034 method Methods 0.000 description 1
-1 rare earth ions Chemical class 0.000 description 1
229910052761 rare earth metal Inorganic materials 0.000 description 1
230000002829 reductive effect Effects 0.000 description 1
230000003014 reinforcing effect Effects 0.000 description 1
230000000284 resting effect Effects 0.000 description 1
238000000926 separation method Methods 0.000 description 1
230000008054 signal transmission Effects 0.000 description 1
239000000126 substance Substances 0.000 description 1
230000003313 weakening effect Effects 0.000 description 1

Classifications

- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06754—Fibre amplifiers
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/2804—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers
- G02B6/2821—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers using lateral coupling between contiguous fibres to split or combine optical signals
- G02B6/2826—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers using lateral coupling between contiguous fibres to split or combine optical signals using mechanical machining means for shaping of the couplers, e.g. grinding or polishing
- G02B6/283—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers using lateral coupling between contiguous fibres to split or combine optical signals using mechanical machining means for shaping of the couplers, e.g. grinding or polishing couplers being tunable or adjustable
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/2804—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers
- G02B6/2821—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers using lateral coupling between contiguous fibres to split or combine optical signals
- G02B6/2835—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers using lateral coupling between contiguous fibres to split or combine optical signals formed or shaped by thermal treatment, e.g. couplers
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/2804—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers
- G02B6/2821—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers using lateral coupling between contiguous fibres to split or combine optical signals
- G02B6/2835—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers using lateral coupling between contiguous fibres to split or combine optical signals formed or shaped by thermal treatment, e.g. couplers
- G02B2006/2839—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers using lateral coupling between contiguous fibres to split or combine optical signals formed or shaped by thermal treatment, e.g. couplers fabricated from double or twin core fibres
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S2301/00—Functional characteristics
- H01S2301/02—ASE (amplified spontaneous emission), noise; Reduction thereof
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06729—Peculiar transverse fibre profile

Landscapes

Physics & Mathematics (AREA)
Optics & Photonics (AREA)
Electromagnetism (AREA)
General Physics & Mathematics (AREA)
Engineering & Computer Science (AREA)
Plasma & Fusion (AREA)
Lasers (AREA)
Optical Communication System (AREA)
Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Light Guides In General And Applications Therefor (AREA)
Crystals, And After-Treatments Of Crystals (AREA)

LTIP1607A 1990-02-07 1993-12-15 A wide band optical amplifier LT3572B (en)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
IT01928090A IT1237970B (it)	1990-02-07	1990-02-07	Amplificatore ottico a fibra attiva,con porzioni a doppio nucleo,a larga banda di lunghezza d'onda di segnale

Publications (2)

Publication Number	Publication Date
LTIP1607A LTIP1607A (en)	1995-07-25
LT3572B true LT3572B (en)	1995-12-27

Family

ID=11156365

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
LTIP1607A LT3572B (en)	1990-02-07	1993-12-15	A wide band optical amplifier

Country Status (29)

Country	Link
EP (1)	EP0441211B1 (de)
JP (2)	JP3045550B2 (de)
KR (1)	KR0179024B1 (de)
CN (1)	CN1023348C (de)
AR (1)	AR246642A1 (de)
AT (1)	ATE113419T1 (de)
AU (1)	AU646238B2 (de)
BR (1)	BR9100626A (de)
CA (1)	CA2035804C (de)
CZ (1)	CZ280565B6 (de)
DE (1)	DE69104738T2 (de)
DK (1)	DK0441211T3 (de)
ES (1)	ES2065555T3 (de)
FI (1)	FI104293B (de)
HK (1)	HK100195A (de)
HU (1)	HU212954B (de)
IE (1)	IE66727B1 (de)
IT (1)	IT1237970B (de)
LT (1)	LT3572B (de)
LV (1)	LV10984B (de)
MY (1)	MY106104A (de)
NO (1)	NO303956B1 (de)
NZ (1)	NZ237031A (de)
PL (1)	PL165200B1 (de)
PT (1)	PT96683B (de)
RU (1)	RU2063105C1 (de)
SK (1)	SK278932B6 (de)
TW (1)	TW198100B (de)
UA (1)	UA25931A1 (de)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
GB2265751B (en) *	1992-03-23	1995-12-20	Univ Southampton	Optical amplifier with automatic self adjusting gain spectrum
IT1270032B (it) *	1994-04-14	1997-04-28	Pirelli Cavi Spa	Sistema di telecomunicazione amplificata a multiplazione a divisione di lunghezza d'onda
IT1273676B (it)	1994-07-25	1997-07-09	Pirelli Cavi Spa	Sistema di telecomunicazione amplificata a multiplazione a divisione di lunghezza d'onda,con potenza di ricezione equalizzata
PE41196A1 (es) *	1994-07-25	1996-12-17	Pirelli Cavi Spa	Sistema de telecomunicacion amplificado para transmisiones en multiplex por division de longitud de onda, capaz de limitar las variaciones en la potencia de salida
DE19740743C1 (de) *	1997-09-16	1999-01-21	Siemens Ag	Optischer Verstärker für Gewinnregelung
JP2001094304A (ja)	1999-09-17	2001-04-06	Tdk Corp	誘電体フィルタ及びその製造方法
RU2153228C1 (ru) *	1999-10-12	2000-07-20	Военный университет связи	Автоматическое устройство обхода для волоконно-оптических сетей связи
FR2822313B1 (fr) *	2001-03-16	2003-07-25	Highwave Optical Tech	Composant optique a base de fibre bi-coeur avec entrees/sorties en fibres mono-coeur
CN1325991C (zh) *	2003-11-14	2007-07-11	中国科学院上海光学精密机械研究所	双芯双包层光纤二波长光放大装置
EP1942083A1 (de) *	2006-12-07	2008-07-09	Datwyler Fiber Optics S.A.	Verfahren und Vorrichtung zur Herstellung einer Vorform für eine aktive optische Faser, aktive optische Faser und Verstärker
KR102428755B1 (ko) *	2017-11-24	2022-08-02	엘지디스플레이 주식회사	파장 변환이 가능한 광섬유 및 이를 사용하는 백라이트 유닛
DE102019114974A1 (de)	2019-06-04	2020-12-10	Friedrich-Schiller-Universität Jena	Lichtwellenleiter
WO2026028430A1 (ja) *	2024-08-02	2026-02-05	Ｎｔｔ株式会社	光分岐デバイス及び光増幅器
WO2026028440A1 (ja) *	2024-08-02	2026-02-05	株式会社フジクラ	マルチコアファイバ
PL450651A1 (pl) *	2024-12-19	2026-06-22	Politechnika Białostocka	Światłowodowe źródło wzmocnionej emisji spontanicznej

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US4315666A (en) *	1979-03-19	1982-02-16	Hicks Jr John W	Coupled communications fibers
US4546476A (en) *	1982-12-10	1985-10-08	The Board Of Trustees Of The Leland Stanford Junior University	Fiber optic amplifier
JPH0646664B2 (ja) *	1984-10-01	1994-06-15	ポラロイドコ−ポレ−シヨン	光導波管装置及びそれを用いたレーザ
US4883335A (en) *	1986-01-06	1989-11-28	American Telephone And Telegraph Company	Single-mode optical fiber tap
US5087108A (en)	1989-08-11	1992-02-11	Societa' Cavi Pirelli S.P.A.	Double-core active-fiber optical amplifier having a wide-band signal wavelength

1990
- 1990-02-07 IT IT01928090A patent/IT1237970B/it active IP Right Grant
- 1990-12-18 IE IE457090A patent/IE66727B1/en not_active IP Right Cessation
1991
- 1991-01-07 MY MYPI91000013A patent/MY106104A/en unknown
- 1991-01-28 AT AT91101039T patent/ATE113419T1/de not_active IP Right Cessation
- 1991-01-28 ES ES91101039T patent/ES2065555T3/es not_active Expired - Lifetime
- 1991-01-28 DK DK91101039.5T patent/DK0441211T3/da active
- 1991-01-28 EP EP91101039A patent/EP0441211B1/de not_active Expired - Lifetime
- 1991-01-28 DE DE69104738T patent/DE69104738T2/de not_active Expired - Fee Related
- 1991-02-02 TW TW080100841A patent/TW198100B/zh active
- 1991-02-05 AU AU70808/91A patent/AU646238B2/en not_active Ceased
- 1991-02-05 NZ NZ237031A patent/NZ237031A/en unknown
- 1991-02-05 PL PL91288961A patent/PL165200B1/pl unknown
- 1991-02-05 CN CN91100697A patent/CN1023348C/zh not_active Expired - Fee Related
- 1991-02-05 AR AR91318988A patent/AR246642A1/es active
- 1991-02-06 FI FI910573A patent/FI104293B/fi active
- 1991-02-06 PT PT96683A patent/PT96683B/pt not_active IP Right Cessation
- 1991-02-06 RU SU4894477/09A patent/RU2063105C1/ru not_active IP Right Cessation
- 1991-02-06 HU HU91401A patent/HU212954B/hu not_active IP Right Cessation
- 1991-02-06 UA UA4894477A patent/UA25931A1/uk unknown
- 1991-02-06 SK SK283-91A patent/SK278932B6/sk unknown
- 1991-02-06 CZ CS91283A patent/CZ280565B6/cs not_active IP Right Cessation
- 1991-02-06 CA CA002035804A patent/CA2035804C/en not_active Expired - Fee Related
- 1991-02-06 NO NO910461A patent/NO303956B1/no not_active IP Right Cessation
- 1991-02-07 KR KR1019910002083A patent/KR0179024B1/ko not_active Expired - Fee Related
- 1991-02-07 BR BR919100626A patent/BR9100626A/pt not_active IP Right Cessation
- 1991-02-07 JP JP3016322A patent/JP3045550B2/ja not_active Expired - Fee Related
1993
- 1993-06-30 LV LVP-93-830A patent/LV10984B/lv unknown
- 1993-12-15 LT LTIP1607A patent/LT3572B/lt not_active IP Right Cessation
1995
- 1995-06-22 HK HK100195A patent/HK100195A/en not_active IP Right Cessation
1999
- 1999-04-27 JP JP12066199A patent/JP3240302B2/ja not_active Expired - Fee Related

Also Published As

Publication number	Publication date
IT9019280A1 (it)	1991-08-07
HUT60551A (en)	1992-09-28
FI104293B1 (fi)	1999-12-15
PL165200B1 (pl)	1994-11-30
NZ237031A (en)	1994-08-26
FI910573A0 (fi)	1991-02-06
DE69104738T2 (de)	1995-05-11
IT1237970B (it)	1993-06-19
SK278932B6 (sk)	1998-04-08
ES2065555T3 (es)	1995-02-16
LV10984B (en)	1996-02-20
HU212954B (en)	1996-12-30
LV10984A (lv)	1995-12-20
FI104293B (fi)	1999-12-15
NO910461D0 (no)	1991-02-06
EP0441211A2 (de)	1991-08-14
EP0441211B1 (de)	1994-10-26
KR0179024B1 (ko)	1999-05-15
JP2000106465A (ja)	2000-04-11
IT9019280A0 (it)	1990-02-07
BR9100626A (pt)	1991-10-29
CN1054670A (zh)	1991-09-18
PT96683A (pt)	1992-12-31
JP3240302B2 (ja)	2001-12-17
CA2035804C (en)	1998-12-01
ATE113419T1 (de)	1994-11-15
PL288961A1 (en)	1991-10-21
CZ280565B6 (cs)	1996-02-14
HU910401D0 (en)	1991-08-28
FI910573L (fi)	1991-08-08
LTIP1607A (en)	1995-07-25
DK0441211T3 (da)	1995-04-24
KR910015872A (ko)	1991-09-30
TW198100B (de)	1993-01-11
CN1023348C (zh)	1993-12-29
JP3045550B2 (ja)	2000-05-29
HK100195A (en)	1995-06-30
IE904570A1 (en)	1991-08-14
AU7080891A (en)	1991-08-08
PT96683B (pt)	1998-08-31
RU2063105C1 (ru)	1996-06-27
AU646238B2 (en)	1994-02-17
DE69104738D1 (de)	1994-12-01
CA2035804A1 (en)	1991-08-08
AR246642A1 (es)	1994-08-31
UA25931A1 (uk)	1999-02-26
CS9100283A2 (en)	1991-09-15
NO303956B1 (no)	1998-09-28
IE66727B1 (en)	1996-01-24
JPH0774414A (ja)	1995-03-17
NO910461L (no)	1991-08-08
MY106104A (en)	1995-03-31
EP0441211A3 (en)	1992-12-02

Legal Events

Date	Code	Title	Description
2003-07-25	MM9A	Lapsed patents	Effective date: 20021215

Publication	Publication Date	Title
JP2853893B2 (ja)	1999-02-03	広帯域信号波長を有する二重コア活性ファイバの光増幅器及びその製造方法
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