JP2000513175A - 多段光ファイバ増幅器 - Google Patents
多段光ファイバ増幅器Info
- Publication number
- JP2000513175A JP2000513175A JP10540641A JP54064198A JP2000513175A JP 2000513175 A JP2000513175 A JP 2000513175A JP 10540641 A JP10540641 A JP 10540641A JP 54064198 A JP54064198 A JP 54064198A JP 2000513175 A JP2000513175 A JP 2000513175A
- Authority
- JP
- Japan
- Prior art keywords
- amplifier
- stage
- fiber
- optical
- signal
- 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
- 239000013307 optical fiber Substances 0.000 title claims description 20
- 239000000835 fiber Substances 0.000 claims abstract description 126
- 230000003287 optical effect Effects 0.000 claims abstract description 79
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 18
- 150000002910 rare earth metals Chemical class 0.000 claims abstract description 18
- 238000005086 pumping Methods 0.000 claims description 16
- 230000008878 coupling Effects 0.000 claims description 6
- 238000010168 coupling process Methods 0.000 claims description 6
- 238000005859 coupling reaction Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 4
- 230000001902 propagating effect Effects 0.000 claims description 3
- 238000012546 transfer Methods 0.000 claims description 2
- 238000001069 Raman spectroscopy Methods 0.000 abstract description 70
- 230000003595 spectral effect Effects 0.000 abstract description 9
- 229910052691 Erbium Inorganic materials 0.000 description 26
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 description 25
- 238000001228 spectrum Methods 0.000 description 21
- 230000000052 comparative effect Effects 0.000 description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 12
- 239000005371 ZBLAN Substances 0.000 description 9
- 238000010586 diagram Methods 0.000 description 7
- 239000000377 silicon dioxide Substances 0.000 description 6
- 230000003321 amplification Effects 0.000 description 5
- 239000006185 dispersion Substances 0.000 description 5
- 238000003199 nucleic acid amplification method Methods 0.000 description 5
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 4
- 229910052769 Ytterbium Inorganic materials 0.000 description 4
- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000003365 glass fiber Substances 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 229910052777 Praseodymium Inorganic materials 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000002019 doping agent Substances 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 230000001404 mediated effect Effects 0.000 description 2
- PUDIUYLPXJFUGB-UHFFFAOYSA-N praseodymium atom Chemical compound [Pr] PUDIUYLPXJFUGB-UHFFFAOYSA-N 0.000 description 2
- 208000022673 Distal myopathy, Welander type Diseases 0.000 description 1
- 208000034384 Welander type distal myopathy Diseases 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- -1 erbium ions Chemical class 0.000 description 1
- 150000002222 fluorine compounds Chemical group 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/29—Repeaters
- H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
- H04B10/2912—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form characterised by the medium used for amplification or processing
-
- 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
- H01S3/06758—Tandem amplifiers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/29—Repeaters
- H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/29—Repeaters
- H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
- H04B10/2912—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form characterised by the medium used for amplification or processing
- H04B10/2916—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form characterised by the medium used for amplification or processing using Raman or Brillouin amplifiers
-
- 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
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094042—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a fibre laser
-
- 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
- H01S3/30—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects
- H01S3/302—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects in an optical fibre
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2210/00—Indexing scheme relating to optical transmission systems
- H04B2210/003—Devices including multiple stages, e.g., multi-stage optical amplifiers or dispersion compensators
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Lasers (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
- Optical Communication System (AREA)
Abstract
Description
Claims (1)
- 【特許請求の範囲】 1.光入力信号を増幅して、該入力信号の光パワーよりも大きい光パワーを有す る中間信号を生成する第1の光ファイバ増幅器段(14)であって、ラマンゲイ ン媒体を含む第1の光ファイバ増幅器段(14)と、 該中間信号を増幅して、該中間信号の光信号パワーよりも大きい光信号パワー を有する出力信号を生成する第2の光ファイバ増幅器段(22)であって、1つ 以上の希土類材料を含むゲイン媒体を含む第2の光ファイバ増幅器段(22)と 、を含む、多段光増幅器ユニット。 2.前記増幅器段の両方をポンピングするために、単一のポンプ源が使用される 、請求項1に記載の多段光ファイバ増幅器ユニット。 3.光ファイバを含み、該光ファイバは、第1の端部(14a)と、第2の端部 (14b)とを有する前記第1の段のファイバ増幅器(14)を、該第1の段の ファイバ増幅器(14)の該第2の端部(14b)に光結合される第1の端部( 22a)と、第2の端部(22b)とを有する前記第2の段のファイバ増幅器( 22)に光結合し、そのため、該第1の段のファイバ増幅器の該第1の端部(1 4a)で吸収されないポンプ信号が、該第2の段のファイバ増幅器(22)に付 与され、該第2の段のファイバ増幅器をポンピングし、前記ポンプ源(18)は 、該第1の段の増幅器の該第2の端部(14b)に光結合され、該第1の段の増 幅器にポンピング信号を提供し、該ポンピング信号は、該ポンピング信号が、該 第1の段のファイバ増幅器の該第1の端部に伝搬するとき、該第1の段のファイ バ増幅器をポンピングする、請求項1または2に記載の多段光増幅器ユニット。 4.入力信号が、前記第1の段のファイバ増幅器の前記第1の端部に提供され、 該第1の段のファイバ増幅器の前記第2の端部に伝搬して増幅し、前記ポンプ信 号が、該入力信号と反対方向に伝搬する、請求項3に記載の多段光増幅器ユニッ ト。 5.前記第1の増幅器段が、前記第2の増幅器段のゲインバンド幅とは異なるゲ インバンド幅を有する、請求項1から4のいずれかに記載の多段光増幅器ユニッ ト。 6.前記第1の増幅器段の前記ゲインバンド幅が、前記第2の増幅器段の前記ゲ インバンド幅と重なる、請求項5に記載の多段光増幅器。 7.前記光増幅器ユニットの全体のゲインが、前記第1および第2のゲインバン ド幅の各々よりも広いシステムゲインバンド幅にわたって実質的に均一である、 請求項6に記載の多段光増幅器ユニット。 8.前記第1の増幅器段が、低雑音増幅器を含み、前記第2の増幅器段が、高ゲ イン増幅器を含む、請求項1から7のいずれかに記載の多段光増幅器ユニット。 9.前記第1および第2の段のファイバ増幅器の間に形成される2つの光結合経 路(28、16、20)をさらに含み、該第1の結合経路(16、20)は、該 第1および第2の段のファイバ増幅器を接続し、該第1の段のファイバ増幅器の 出力から該第2の段のファイバ増幅器への入力として前記入力信号を提供し、該 第2の結合経路(28)は、該第1の段のファイバ増幅器から該第2の段のファ イバ増幅器への余分なポンピングパワーの移送を提供して、該第2の段のファイ バ増幅器をポンピングする、請求項1、2、4から8のいずれかに記載の多段光 増幅器ユニット。 10.前記光増幅器の入力ポートに結合される第1の入力ポート(12a)を有 し、前記第1の増幅器段(14)の前記第1のポート(14a)に結合される第 2のポート(12b)を有する、第1の波分割マルチプレクサ(12)と、 該第1の増幅器段(14)の前記第2のポート(14b)に結合される第1の ポート(16a)と、前記第2の増幅器段(22)の前記第1のポート(22a )に結合される第2のポート(16b)と、を有する、第2の波分割マルチプレ クサ(16)と、 第3の分割マルチプレクサ(24)であって、該第2の増幅器段(22)の前 記第2のポート(22b)に結合される第1のポート(24a)と、該光増幅器 の出力ポートに結合される第3の波分割マルチプレクサの第2のポート(24b )と、を有する第3の分割マルチプレクサ(24)と、 該第1の波分割マルチプレクサ(12)の第3のポートと、該第3の波分割マ ルチプレクサ(24)の第3のポート(24c)との間に結合される信号経路( 28)と、をさらに含む、請求項1、2、4から9のいずれかに記載の多段光増 幅器ユニット。 11.ポンプ信号が、前記第1の段において増幅される信号と反対方向に、該第 1の増幅器段を通って伝搬し、該ポンプ信号の吸収されない部分が、前記第2の 段において増幅される信号と反対方向に伝搬するように該第2の増幅器段に向け られる、請求項1から10のいずれかに記載の多段光増幅器ユニット。 12.前記第1の増幅器段が、該第1の増幅器段をその飽和レベルよりも下のレ ベルに維持する態様で、前記ポンプ源によりポンピングされる、請求項1から1 1のいずれかに記載の多段光増幅器ユニット。 13.互いに結合される複数のポンプ源を含むポンプエネルギー源をさらに含む 、請求項1から12のいずれかに記載の多段光増幅器ユニット。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US81911897A | 1997-03-17 | 1997-03-17 | |
US08/819,118 | 1997-03-17 | ||
PCT/US1998/004974 WO1998042088A1 (en) | 1997-03-17 | 1998-03-13 | Multiple stage optical fiber amplifier |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2000513175A true JP2000513175A (ja) | 2000-10-03 |
JP3366337B2 JP3366337B2 (ja) | 2003-01-14 |
Family
ID=25227249
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP54064198A Expired - Lifetime JP3366337B2 (ja) | 1997-03-17 | 1998-03-13 | 多段光ファイバ増幅器 |
JP11264690A Withdrawn JP2000091683A (ja) | 1997-03-17 | 1999-09-17 | 多段光ファイバ増幅器 |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11264690A Withdrawn JP2000091683A (ja) | 1997-03-17 | 1999-09-17 | 多段光ファイバ増幅器 |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0968579B1 (ja) |
JP (2) | JP3366337B2 (ja) |
DE (1) | DE69815314T2 (ja) |
WO (1) | WO1998042088A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003046174A (ja) * | 2001-08-01 | 2003-02-14 | Fujikura Ltd | 広帯域複合光増幅器 |
Families Citing this family (40)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6631025B2 (en) * | 2000-01-12 | 2003-10-07 | Xtera Communications, Inc. | Low-noise distributed Raman amplifier using bi-directional pumping using multiple Raman orders |
US6760148B2 (en) | 1998-03-24 | 2004-07-06 | Xtera Communications, Inc. | Nonlinear polarization amplifiers in nonzero dispersion shifted fiber |
US6693737B2 (en) | 1998-03-24 | 2004-02-17 | Xtera Communications, Inc. | Dispersion compensating nonlinear polarization amplifiers |
US6985283B1 (en) * | 1998-06-16 | 2006-01-10 | Xtera Communications, Inc. | Fiber-optic compensation for dispersion, gain tilt, and band pump nonlinearity |
US6359725B1 (en) | 1998-06-16 | 2002-03-19 | Xtera Communications, Inc. | Multi-stage optical amplifier and broadband communication system |
US6335820B1 (en) | 1999-12-23 | 2002-01-01 | Xtera Communications, Inc. | Multi-stage optical amplifier and broadband communication system |
US6344922B1 (en) | 1998-07-21 | 2002-02-05 | Corvis Corporation | Optical signal varying devices |
US6115174A (en) | 1998-07-21 | 2000-09-05 | Corvis Corporation | Optical signal varying devices |
US6839522B2 (en) | 1998-07-21 | 2005-01-04 | Corvis Corporation | Optical signal varying devices, systems and methods |
EP2306605B1 (en) | 1998-07-23 | 2012-05-23 | The Furukawa Electric Co., Ltd. | Pumping unit for a Raman amplifier and Raman amplifier comprising the same |
US6356383B1 (en) | 1999-04-02 | 2002-03-12 | Corvis Corporation | Optical transmission systems including optical amplifiers apparatuses and methods |
US6587261B1 (en) | 1999-05-24 | 2003-07-01 | Corvis Corporation | Optical transmission systems including optical amplifiers and methods of use therein |
FR2794912A1 (fr) * | 1999-06-10 | 2000-12-15 | Cit Alcatel | Amplificateur raman hybride |
JP4574920B2 (ja) * | 1999-07-08 | 2010-11-04 | アルカテル−ルーセント | レーリー散乱によって生じるラマン増幅の制限を越えるためのアイソレータの使用 |
US6611369B2 (en) | 1999-09-06 | 2003-08-26 | Furukawa Electric Co., Ltd. | Optical signal amplifier |
JP2001102666A (ja) * | 1999-09-28 | 2001-04-13 | Fujitsu Ltd | 光増幅器 |
FR2800218B1 (fr) | 1999-10-22 | 2002-01-11 | Algety Telecom | Systeme de transmission par fibre optique utilisant des impulsions rz |
FR2800219B1 (fr) | 1999-10-22 | 2006-06-30 | Algety Telecom | Procede d'ajustement de puissance pour un systeme de transmission optique a multiplexage en longueur d'onde |
JP2001223646A (ja) | 2000-02-07 | 2001-08-17 | Nec Corp | 光増幅中継器とこれを用いた光伝送装置 |
WO2001065646A2 (en) * | 2000-02-29 | 2001-09-07 | Jds Uniphase Corporation | Multiple stage optical fiber amplifier |
US6384963B2 (en) * | 2000-03-03 | 2002-05-07 | Lucent Technologies Inc. | Optical communication system with co-propagating pump radiation for raman amplification |
US6344925B1 (en) | 2000-03-03 | 2002-02-05 | Corvis Corporation | Optical systems and methods and optical amplifiers for use therein |
WO2002019023A1 (en) * | 2000-08-30 | 2002-03-07 | Fujitsu Limited | Light amplifier using raman amplification and control method thereof |
GB0024453D0 (en) * | 2000-10-05 | 2000-11-22 | Nortel Networks Ltd | Raman amplification |
US7274880B2 (en) | 2000-11-16 | 2007-09-25 | Tyco Telecommunications (Us) Inc. | Raman assisted EDFA system and method |
EP1233484A1 (en) * | 2001-02-14 | 2002-08-21 | Alcatel | Optical fibre amplifier |
CA2373912A1 (en) * | 2001-03-01 | 2002-09-01 | Takeshi Hirasawa | Optical transmission system |
DE60209048T8 (de) * | 2001-03-09 | 2007-04-05 | Nippon Telegraph And Telephone Corp. | Weisslichtquelle |
US6810214B2 (en) | 2001-03-16 | 2004-10-26 | Xtera Communications, Inc. | Method and system for reducing degradation of optical signal to noise ratio |
US6532101B2 (en) | 2001-03-16 | 2003-03-11 | Xtera Communications, Inc. | System and method for wide band Raman amplification |
US6587259B2 (en) | 2001-07-27 | 2003-07-01 | Xtera Communications, Inc. | System and method for controlling noise figure |
US6943936B2 (en) | 2001-08-03 | 2005-09-13 | The Regents Of The University Of Michigan | Co-propagating Raman amplifiers |
US6594071B1 (en) | 2001-10-02 | 2003-07-15 | Xtera Communications, Inc. | Method and apparatus for amplifier control |
US6819479B1 (en) | 2001-12-20 | 2004-11-16 | Xtera Communications, Inc. | Optical amplification using launched signal powers selected as a function of a noise figure |
US6778321B1 (en) | 2002-03-15 | 2004-08-17 | Xtera Communications, Inc. | Fiber optic transmission system for a metropolitan area network |
US6825973B1 (en) | 2002-03-15 | 2004-11-30 | Xtera Communications, Inc. | Reducing leading edge transients using co-propagating pumps |
US7197245B1 (en) | 2002-03-15 | 2007-03-27 | Xtera Communications, Inc. | System and method for managing system margin |
US7058311B1 (en) | 2002-03-15 | 2006-06-06 | Xtera Communications, Inc. | System and method for dispersion compensation in an optical communication system |
JP4113761B2 (ja) * | 2002-11-05 | 2008-07-09 | 富士通株式会社 | 光増幅装置 |
JP4484565B2 (ja) * | 2004-03-30 | 2010-06-16 | 富士通株式会社 | チルト補償機能を有する多段光増幅器 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4881790A (en) * | 1988-04-25 | 1989-11-21 | American Telephone And Telegraph Company, At&T Bell Laboratories | Optical communications system comprising raman amplification means |
US5050949A (en) * | 1990-06-22 | 1991-09-24 | At&T Bell Laboratories | Multi-stage optical fiber amplifier |
DE4305838A1 (de) * | 1993-02-26 | 1994-09-01 | Sel Alcatel Ag | Mehrstufiger faseroptischer Verstärker |
US5430572A (en) * | 1993-09-30 | 1995-07-04 | At&T Corp. | High power, high gain, low noise, two-stage optical amplifier |
US5530583A (en) * | 1993-11-18 | 1996-06-25 | Matsushita Electric Industrial Co., Ltd. | Optical signal amplification apparatus and an optical fiber transmission system using the same |
-
1998
- 1998-03-13 JP JP54064198A patent/JP3366337B2/ja not_active Expired - Lifetime
- 1998-03-13 WO PCT/US1998/004974 patent/WO1998042088A1/en active IP Right Grant
- 1998-03-13 DE DE69815314T patent/DE69815314T2/de not_active Expired - Lifetime
- 1998-03-13 EP EP98909174A patent/EP0968579B1/en not_active Expired - Lifetime
-
1999
- 1999-09-17 JP JP11264690A patent/JP2000091683A/ja not_active Withdrawn
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003046174A (ja) * | 2001-08-01 | 2003-02-14 | Fujikura Ltd | 広帯域複合光増幅器 |
Also Published As
Publication number | Publication date |
---|---|
WO1998042088A1 (en) | 1998-09-24 |
EP0968579A1 (en) | 2000-01-05 |
EP0968579B1 (en) | 2003-06-04 |
JP3366337B2 (ja) | 2003-01-14 |
JP2000091683A (ja) | 2000-03-31 |
DE69815314T2 (de) | 2003-12-11 |
DE69815314D1 (de) | 2003-07-10 |
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