WO1991007690A1 - Amplificateur optique - Google Patents
Amplificateur optique Download PDFInfo
- Publication number
- WO1991007690A1 WO1991007690A1 PCT/JP1990/001499 JP9001499W WO9107690A1 WO 1991007690 A1 WO1991007690 A1 WO 1991007690A1 JP 9001499 W JP9001499 W JP 9001499W WO 9107690 A1 WO9107690 A1 WO 9107690A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- light
- rare
- doped
- fiber
- rare earth
- Prior art date
Links
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
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
-
- 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
- H01S3/094003—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light the pumped medium being a fibre
-
- 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
- H01S3/06745—Tapering of the fibre, core or active region
Definitions
- the present invention relates to an optical amplifier configured using a rare earth deep fiber doped with a rare earth element or a rare earth deep optical waveguide.
- repeaters are inserted at fixed distances to compensate for the attenuation of optical signals due to optical fiber loss. ing.
- the optical signal is converted to an electric signal by a photodiode, amplified by an electronic amplifier, and then converted to an optical signal by a semiconductor laser or the like. It is configured to transmit the data again to the EVA transmission line. If this optical signal can be directly amplified with low noise as it is, the optical repeater can be made smaller and more economical.
- the optical amplifier combining (a) the rare-earth dope fiber and the pumping light has no polarization dependence, low noise, and low transmission path. It is an excellent feature that the coupling loss is small, and is expected to enable a dramatic increase in the transmission repeater distance in an optical fiber transmission system and distribution of optical signals to many. ing.
- Fig. 1 shows the principle of optical amplification using rare earth deep fibers.
- Reference numeral 2 denotes an optical fiber composed of a core 2a and a cladding 2b, and an erbium (Er) is doped in the core 2a.
- Er erbium
- the Er atoms are excited to a high energy level.
- the signal light enters the Er atom in the optical fiber 2 excited to the high energy level in this way, the Er atom transitions to the low energy level.
- stimulated emission of light occurs, and signal light is emitted.
- the signal gradually increases along the optical fiber, and the signal light is amplified.
- the dop concentration of Er in the core 2 a is generally uniform in the longitudinal direction and the radial direction of the Er dope fiber 2.
- the rare earth dope fiber in which the dope concentration of the rare earth element in the core is uniform the rare earth element is doped. In some cases, power loss of signal light and pump light may be caused. Therefore, the optical amplifier having the conventional configuration as described above is suitable for increasing the amplification efficiency (the degree of amplification of the signal light with respect to the constant input bombing light). I can't say.
- signal light and bomping light are propagated to a rare earth dope fiber doped with a rare earth element to amplify the signal light.
- the rare earth deep fiber An optical amplifier is provided in which the diameter of the portion where the rare earth element is doped is gradually reduced in the direction of propagation of the pumping light.
- the propagation direction of the boning light may be either the same direction as the signal light or the opposite direction.
- the rare earth element As a means for gradually reducing the diameter of the portion where the rare earth element is doped in the direction of propagation of the bombo light, the rare earth element is heated and stretched to draw the rare earth element. The diameter of the part where the is dropped is changed continuously.
- a plurality of rare earth dope fibers having different diameters at the portions where the rare earth element is doped may be connected in series.
- an optical amplifier configured to propagate signal light and pumping light through a rare earth doped optical waveguide doped with a rare earth element to amplify the signal light.
- an optical amplifier in which the width of a portion of the rare-earth-doped optical waveguide where the rare-earth element is doped is gradually narrowed in the propagation direction of the bombining light.
- Fig. 1 is a schematic diagram showing the principle of optical amplification by rare earth dope fiber.
- Fig. 3 is a diagram illustrating the light intensity distribution at each point in Fig. 2A,
- FIG. 4 is a configuration diagram of an optical amplifier according to an embodiment of the present invention.
- Figures 5A and 5B are cross-sectional views of the upstream fiber and the downstream fiber.
- FIG. 6 is a configuration diagram of an optical amplifier according to another embodiment of the present invention.
- FIGS. 7A and 7B are explanatory diagrams of a method of manufacturing a stretched fiber.
- FIG. 8 is a configuration diagram of an optical amplifier according to still another embodiment of the present invention.
- FIG. 9 is an enlarged view of the optical waveguide shown in FIG. 8, and FIG. 10 is a configuration diagram of an optical amplifier according to still another embodiment of the present invention.
- FIGS. 2A and 2B show the principle of the present invention.
- Fig. 2A shows the case where the signal light and the Boning light propagate in the same direction through the rare earth dopant fiber 2;
- Fig. 2B shows the case where the Signal light and the Boning light do not pass through the rare earth dopant.
- the figure shows the case where the propagation through the aver 2 is in the opposite direction.
- the optical amplifier of the present invention is a rare earth deep fiber 2
- the diameter of the portion of the rare earth dope fiber 2 where the rare earth element is doped is adjusted. As shown by the broken line, the size is gradually reduced in the direction of propagation of the boning light.
- point A is the position on the upstream side in the propagation direction of the signal light and pumping light of rare earth dope fiber 2
- point C is the position on the downstream side
- point B is points A and C. Indicates the position between (A), (B),
- (C) is a graph showing the intensity distribution of the bombering light at points A, B, and C in Fig. 2A, respectively.
- the axis indicates the position of the rare earth dope fiber 2 in the radial direction.
- the bombing light has a so-called Gaussian distribution in which the electric field amplitude in the center of the fiber increases, and the amplitude is that the bombing light excites rare earth atoms. Therefore , the level indicated by Pth in FIG. 3, which becomes gradually smaller along the propagation direction, is higher than the level where optical amplification is performed. At this level, it is a threshold level at which optical amplification is not performed.
- R a , R b , and R c denote the radii of the parts that give an electric field amplitude larger than the threshold value P th at points A, B, and C, respectively.
- the rare earth element does not contribute to the optical amplification at all even if it is doped. Presence attenuates the Boning light, making efficient optical amplification difficult.
- the diameter of the part of the rare-earth doped fiber 2 where the rare-earth element is doped is gradually reduced in the direction of the propagation of the bombining light. As shown in Fig. 3, the harmful rare earth element doping region that does not contribute to the optical amplification and attenuates the bombing light is eliminated.
- An optical amplifier suitable for increasing or reducing the size or the amplification efficiency is provided.
- FIG. 4 is a configuration diagram of an optical fiber amplifier showing an embodiment of the present invention, in which a rare earth element is doped.
- a rare earth dopants 21 and 22 By connecting a plurality (two in this embodiment) of rare earth dopants 21 and 22 having different diameters in series, the rare earth dopants are connected in series. The diameter of the portion where the rare earth element is doped is gradually reduced in the direction of the propagation of the pumping light.
- the connection between the rare earth dopants 21 and 22 is made by, for example, fusion (splicing).
- the input side optical fiber 4 for propagating the signal light to be amplified, for example, by fusion, is connected to the amplification fiber.
- the output-side optical fibers 6 for transmitting the separated light are connected to each other.
- a fusion-type optical power blur 8 is formed in the fiber fusion type optical power blur 8, a portion corresponding to the input side optical fiber 4 has a first input port 8a and a first output port 8c. The portion corresponding to the optical fiber of the book forms the second input port 8b and the second output port 8d.
- the second input port 8b is connected to a semiconductor laser 10 serving as a bombing light source.
- the bombining when amplifying the signal light having a wavelength of 1.55 ⁇ m band, the bombining is required.
- the wavelength of light For example, the 0.80 m band, the 0.98 m band, the 1.481 1 band, and the like are selected.
- the signal light input to the first input port 8a is selected so that the selected ponbing light and signal light are incident on the rare earth dope fiber with high efficiency. Almost 100% is guided to the first output port 8c, and approximately 100% of the pump light input to the second input port 8b is the same as the first output port 8c.
- the structural parameters of the fiber fusion type optical power blur 8 are set so as to be guided to the following.
- the rare earth dope fiber 21 located on the upstream side in the propagation direction of the signal light and the pumping light is referred to as an upstream fiber
- the rare earth dope fiber 2 located on the downstream side is referred to as an upstream fiber.
- 2 is called the downstream fiber, and their cross-sectional configurations are shown in Figs. 5A and 5B, respectively.
- the upstream fin, '21 consists of the cladding 21a and the core 21b with a higher refractive index, and the core 21b has an E r of one. Doped at similar concentrations.
- the downstream side 22 is composed of the clad 22a and the first core 22b, the second core 22c, and the first core 22b and the second core 22b.
- the refractive index distribution at 2c is the same as the refractive index distribution of core 21b of the upstream fin, and the refractive index of clad 22a is the same as that of the upstream fiber. It is the same as the refractive index of lad 21a.
- the second core 22 corresponding to the central portion is provided in the first core 22 b and the second core 22 c of the downstream fiber. Only c is doped with Er at a similar concentration.
- a rare earth element-doped core glass may be formed on the inner wall of the reaction tube, and a rare earth element-doped core glass may be formed thereon.
- two rare-earth dope fibers consisting of the upstream fiber 21 and the downstream fiber 22 are used, but the downstream fiber 2 is used.
- a plurality of rare earth dope fibers having different diameters at the portion where the rare earth element is doped are manufactured in accordance with the manufacturing method of the second method.
- These rare earth dope fibers have the above diameters. They may be connected in series so as to decrease in the propagation direction of the pumping light.
- the concentration of the doped Er is made uniform in the radial direction.
- the concentration distribution of the rare-earth element that is dropped is the propagation light.
- the height may be increased in the central portion so as to achieve efficient optical amplification.
- the input signal light and the pumping light from the semiconductor laser 10 are combined in a fiber fusion type optical power amplifier 8. Incident on the upstream fiber 21, it is not absorbed yet and has sufficient strength.
- the signal light is amplified by the scanning light.
- the pumping light and the amplified signal light which have a relatively small intensity distribution due to this optical amplification, enter the downstream fiber 22, the downstream fiber 22 Since the diameter of the second core 22c where the Er of the side fiber is dropped is smaller than the diameter of the core 21b of the upstream side fiber, it is undesirable. Efficient light amplification is achieved without causing the absorption of bon- boing light. Applying this principle to an optical waveguide, the same optical amplification can be achieved by connecting multiple optical waveguide substrates with different widths of the optical waveguide on which Er is doped.
- FIG. 6 is a configuration diagram of an optical fiber amplifier showing another embodiment of the present invention, and the same parts as those in the above-described embodiment are denoted by the same reference numerals.
- the diameter of the portion where the rare earth element is doped is changed continuously.
- the rare-earth element has a diameter of the part where the rare-earth element is doped in the rare-earth element. They are gradually getting smaller in the direction. In order to make the mystery of the portion where Er is dominated in this way continuously smaller, for example, the following is performed. First, as shown in FIG. 7A, the heating of the approximate center portion of the rare earth dope fiber 2 having a predetermined length is performed.
- the rare-earth dope fiber 2 is heated by the wrench 12 so as to increase the temperature and is stretched in the direction of the arrow in the figure. Then, a rare earth dope fiber 2 ′ having a diameter at the center smaller than that at the end is formed. By cutting this rare earth dope fin 2 'at the center, the diameter of the portion where Er is dropped is continuously reduced. Obtain a deep fiber 23 (extended fiber).
- the dashed lines in FIGS. 7A and 7B show the portions where Er is dropped in the stretched fins, ′, and the like.
- the diameter of the portion of the rare-earth doped fiber where the rare-earth element is doped is continuously changed, so that the diameter is stepwise. It becomes possible to provide an optical fiber amplifier having higher amplification efficiency as compared with the previous embodiment that changes.
- the signal light and the excitation light are made to propagate in the same direction through the rare earth dope fiber, but the signal light and the excitation light are made to propagate through the rare earth dope fiber.
- O Propagation in the reverse direction is o
- the formation of the Er-doped portion 29 in the optical waveguide 28 while controlling the width thereof can be performed by, for example, a thermal diffusion method.
- the Boning light incident on the waveguide 28 loses energy when exciting the Er in the waveguide 28 to a high energy level. Therefore, as the light propagates through the waveguide 28, the power of the boring light is attenuated.
- the threshold is formed by forming the Er dop range in the waveguide 28 so as to be continuously narrowed in accordance with the attenuation of the pumping light power. It is possible to prevent the boring light below the value from being absorbed by Er.
- the signal light amplified by the Er-doped optical waveguide 28 is coupled to the output-side optical fiber 6 by the pair of lenses 30 and 31.
- an optical amplifier can be integrated using a waveguide type multiplexer 35.
- a structure is used in which an optical amplifier can be integrated using a waveguide type multiplexer 35.
- an optical waveguide 33 on which signal light is incident and an optical waveguide 34 on which pumping light from the boning LD 10 is incident are formed on the waveguide substrate 32.
- the signal light and the pumping light propagating through these optical waveguides 33 and 34 are multiplexed by the multiplexer 35, and the Erd is formed on the substrate 27. And enters the optical waveguide 28.
- the waveguide substrates 27 and 32 are adhered at their waveguide portions with an optical adhesive or the like.
- FIGS. 8 and 10 is an embodiment of the forward pumping in which the incident directions of the pumping light and the signal light are the same, but the embodiment shown in FIG. Similar effects can be obtained in the case of backward pumping in which light is incident from a different direction.
- the diameter of the portion of the rare earth element where the rare earth element is doped is gradually reduced in the direction of propagation of the pumping light.
- an optical amplifier suitable for increasing the amplification efficiency. This is the same in the case of an optical waveguide doped with a rare earth element.
- a relatively low-power semiconductor laser can be used as a pouring light source. And you can do it. Also, if the amplification efficiency can be increased, if the output of a semiconductor laser used as a bombining light source is the same, the rare earth dope filter used The length of the bar can be shortened, and a compact optical amplifier can be provided.
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Lasers (AREA)
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP90916809A EP0454865B1 (en) | 1989-11-20 | 1990-11-16 | Optical amplifier |
DE69026815T DE69026815T2 (de) | 1989-11-20 | 1990-11-16 | Optischer verstärker |
US08/259,133 US5508842A (en) | 1989-11-20 | 1994-06-13 | Optical amplifier |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP29971289 | 1989-11-20 | ||
JP1/299712 | 1989-11-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1991007690A1 true WO1991007690A1 (fr) | 1991-05-30 |
Family
ID=17876054
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1990/001499 WO1991007690A1 (fr) | 1989-11-20 | 1990-11-16 | Amplificateur optique |
Country Status (5)
Country | Link |
---|---|
US (1) | US5508842A (ja) |
EP (1) | EP0454865B1 (ja) |
CA (1) | CA2042578C (ja) |
DE (1) | DE69026815T2 (ja) |
WO (1) | WO1991007690A1 (ja) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5508842A (en) * | 1989-11-20 | 1996-04-16 | Fujitsu Limited | Optical amplifier |
JP2001267664A (ja) * | 2000-02-14 | 2001-09-28 | Lucent Technol Inc | 導波路構造を含む装置 |
JP2009059924A (ja) * | 2007-08-31 | 2009-03-19 | Sunx Ltd | レーザ発生装置及びレーザ加工装置 |
US11095086B2 (en) | 2018-03-30 | 2021-08-17 | Fujikura Ltd. | Amplification optical fiber, fiber laser device, and optical resonator |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5131069A (en) * | 1991-08-12 | 1992-07-14 | Corning Incorporated | Fiber amplifier having modified gain spectrum |
US5321711A (en) * | 1992-08-17 | 1994-06-14 | Alliedsignal Inc. | Segmented solid state laser gain media with gradient doping level |
DE4430512C2 (de) * | 1994-08-27 | 2000-06-29 | Bosch Gmbh Robert | Vorrichtung zum Beschalten einer verstärkenden Faser |
US7576909B2 (en) * | 1998-07-16 | 2009-08-18 | Imra America, Inc. | Multimode amplifier for amplifying single mode light |
US6937636B1 (en) * | 1999-09-27 | 2005-08-30 | The Regents Of The University Of California | Tapered laser rods as a means of minimizing the path length of trapped barrel mode rays |
GB9928696D0 (en) * | 1999-12-03 | 2000-02-02 | Swan Thomas & Co Ltd | Optical devices and methods of manufacture thereof |
DE10009379C2 (de) * | 2000-02-29 | 2002-04-25 | Schneider Laser Technologies | Faseroptischer Verstärker |
FR2830376B1 (fr) * | 2001-10-01 | 2010-11-05 | Teem Photonics | Amplificateur optique hybride et matrice de tels amplificateurs |
DE10203392B4 (de) * | 2002-01-29 | 2014-09-04 | Osram Opto Semiconductors Gmbh | Anordnung zur Einkopplung von Strahlung in eine Lichtleitfaser |
WO2004075364A1 (ja) * | 2003-02-21 | 2004-09-02 | Fujitsu Limited | 遅延位相整合ファイバを用いた光増幅器 |
WO2005112206A1 (en) * | 2004-05-13 | 2005-11-24 | Soreq Nuclear Research Center | High power fiber amplifier |
US7768700B1 (en) | 2006-11-30 | 2010-08-03 | Lockheed Martin Corporation | Method and apparatus for optical gain fiber having segments of differing core sizes |
US9214781B2 (en) | 2013-11-21 | 2015-12-15 | Lockheed Martin Corporation | Fiber amplifier system for suppression of modal instabilities and method |
US10156675B1 (en) * | 2014-08-27 | 2018-12-18 | Bae Systems Information And Electronic Systems Integration Inc. | Method and apparatus for the modulation of pump absorption in a clad optical fiber that is used in lasers and amplifiers |
US11808970B2 (en) | 2019-01-02 | 2023-11-07 | Lumentum Operations Llc | Optical fiber with variable absorption |
US11175449B2 (en) * | 2019-01-02 | 2021-11-16 | Lumentum Operations Llc | Optical fiber with variable absorption |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6114624A (ja) * | 1984-06-29 | 1986-01-22 | Nippon Telegr & Teleph Corp <Ntt> | 光フアイバによる光増幅装置 |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4161944A (en) * | 1976-09-17 | 1979-07-24 | Muckerheide Myron C | Laser system and method and laser amplifier for use therewith |
US4554510A (en) * | 1983-09-12 | 1985-11-19 | The Board Of Trustees Of Leland Stanford Junior University | Switching fiber optic amplifier |
US5048026A (en) * | 1983-09-30 | 1991-09-10 | The Board Of Trustees Of The Leland Stanford Junior University | Fiber optic amplifier |
US4739507A (en) * | 1984-11-26 | 1988-04-19 | Board Of Trustees, Stanford University | Diode end pumped laser and harmonic generator using same |
US4653056A (en) * | 1985-05-01 | 1987-03-24 | Spectra-Physics, Inc. | Nd-YAG laser |
WO1987001246A1 (en) * | 1985-08-13 | 1987-02-26 | Robert Joseph Mears | Fibre-optic lasers and amplifiers |
US4867518A (en) * | 1988-08-31 | 1989-09-19 | The United States Of America As Represented By The Secretary Of The Navy | All-fiber SFPM amplifier |
US4941726A (en) * | 1988-08-31 | 1990-07-17 | The Unites States Of America As Represented By The Secretary Of The Navy | Tapered fiber amplifier |
JPH0373934A (ja) * | 1989-08-15 | 1991-03-28 | Fujitsu Ltd | 光増幅器 |
US5058974A (en) * | 1989-10-06 | 1991-10-22 | At&T Bell Laboratories | Distributed amplification for lightwave transmission system |
DE69026815T2 (de) * | 1989-11-20 | 1996-09-19 | Fujitsu Ltd | Optischer verstärker |
JPH06114624A (ja) * | 1992-10-01 | 1994-04-26 | Asama Giken Kogyo Kk | キー溝用ブローチおよびそれを備えたキー溝作製装置 |
-
1990
- 1990-11-16 DE DE69026815T patent/DE69026815T2/de not_active Expired - Fee Related
- 1990-11-16 WO PCT/JP1990/001499 patent/WO1991007690A1/ja active IP Right Grant
- 1990-11-16 CA CA002042578A patent/CA2042578C/en not_active Expired - Fee Related
- 1990-11-16 EP EP90916809A patent/EP0454865B1/en not_active Expired - Lifetime
-
1994
- 1994-06-13 US US08/259,133 patent/US5508842A/en not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6114624A (ja) * | 1984-06-29 | 1986-01-22 | Nippon Telegr & Teleph Corp <Ntt> | 光フアイバによる光増幅装置 |
Non-Patent Citations (3)
Title |
---|
O plus E, Consecutive Vol. 113, April 1989 (Tokyo), TADAKUNI SHIMADA "Er. Impact given by an Optical Amplifier of Doped Fiber onto an Optical Communication System", p. 112-118, refer particularly to Fig. 14. * |
O plus E, consecutive Vol. 122, January 1990 (Tokyo), HIROYUKI TANAKA "Er. Doped Fiber", p. 112-118, refer particularyly to p. 115. * |
See also references of EP0454865A4 * |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5508842A (en) * | 1989-11-20 | 1996-04-16 | Fujitsu Limited | Optical amplifier |
JP2001267664A (ja) * | 2000-02-14 | 2001-09-28 | Lucent Technol Inc | 導波路構造を含む装置 |
JP2009059924A (ja) * | 2007-08-31 | 2009-03-19 | Sunx Ltd | レーザ発生装置及びレーザ加工装置 |
US11095086B2 (en) | 2018-03-30 | 2021-08-17 | Fujikura Ltd. | Amplification optical fiber, fiber laser device, and optical resonator |
Also Published As
Publication number | Publication date |
---|---|
US5508842A (en) | 1996-04-16 |
EP0454865B1 (en) | 1996-05-01 |
DE69026815T2 (de) | 1996-09-19 |
DE69026815D1 (de) | 1996-06-05 |
EP0454865A4 (en) | 1993-04-21 |
EP0454865A1 (en) | 1991-11-06 |
CA2042578C (en) | 1995-04-04 |
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