WO2004086118A1 - 光周波数線形チャープ量可変装置 - Google Patents
光周波数線形チャープ量可変装置 Download PDFInfo
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- WO2004086118A1 WO2004086118A1 PCT/JP2004/003911 JP2004003911W WO2004086118A1 WO 2004086118 A1 WO2004086118 A1 WO 2004086118A1 JP 2004003911 W JP2004003911 W JP 2004003911W WO 2004086118 A1 WO2004086118 A1 WO 2004086118A1
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- WIPO (PCT)
- Prior art keywords
- mirror
- dielectric multilayer
- movable mirror
- movable
- incident
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Classifications
-
- 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
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29346—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by wave or beam interference
- G02B6/29361—Interference filters, e.g. multilayer coatings, thin film filters, dichroic splitters or mirrors based on multilayers, WDM filters
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/002—Optical devices or arrangements for the control of light using movable or deformable optical elements the movement or the deformation controlling the frequency of light, e.g. by Doppler effect
Definitions
- the present invention relates to an optical frequency linear chirp amount variable device used in the photochemical reaction field, the optical material processing field, or the ultrahigh-speed optical communication field. Back technology
- femtosecond light pulses have been used in various forms for controlling the molecular state or the electronic state of solids, controlling chemical reactions, or processing materials (see, for example, references 1 to 5 below).
- the application of the femtosecond optical pulse has been expanded, the demand for a femtosecond optical pulse generator having a narrower time width and a femtosecond optical pulse application device having excellent cost and convenience have been increased.
- Frequency capping is a phenomenon in which the instantaneous frequency of an optical pulse changes with time. A case in which it increases linearly with time is called a positive cap, and a case in which it linearly decreases is called a negative cap.
- the generation of a femtosecond optical pulse is a technology that controls the relative phase between the spectral components of the optical pulse whose time width has widened and compresses the time width to the limit of the Fourier transform. Since the spread of the light pulse on the time axis is caused by the relative phase relationship between the spectral components of the light pulse, the pulse compression is performed by compensating the relative phase with respect to the frequency, that is, by causing the pulse to be chirped (for example, , Reference 6). Linear chirp is also called second-order dispersion because it occurs when the propagation constant of light has a constant group velocity dispersion, that is, when it has a square dependence of frequency.
- a conventional device for controlling the amount of the chip uses a prism pair or a diffraction grating pair, and generally changes the distance between each pair to change the amount of the negative charge. With these devices, adding a large negative chirp over a wide frequency spectrum range will not only add a linear chirp, ie a second-order dispersion, but also a higher-order dispersion than the second-order dispersion. There is a problem of doing so.
- the spectrum of the light pulse is spatially dispersed depending on the frequency, and a liquid crystal device spatially arranged at a position with a different frequency is used.
- a liquid crystal device spatially arranged at a position with a different frequency is used.
- the liquid crystal element has a low damage threshold for light energy, cannot withstand the use of high-energy light pulses, and the size of each device increases the cost, There is a problem when convenience deteriorates.
- dielectric multilayer mirror As a device for controlling the amount of chip, there is a dielectric multilayer mirror (for example, see Reference 8).
- the dielectric multilayer mirror controls the thickness of an optical thin film having a different refractive index (dielectric constant).
- the light reflected from this laminated film has a phase proportional to the frequency.
- high optical materials have values Ki and damage to the light energy, for example, Runode use the S i 0 2 and T i 0 2 as a dielectric multilayer film, withstand the use of high energy light pulses.
- light pulse is applied to dielectric multilayer film.
- the device is compact because it only reflects light.
- Bunnan Inu 4 J. Cao, C. J. Bardeen, and K. R. Wilson,
- the conventional linear chirp device using the dielectric multilayer mirror has the following problems.
- FIG. 5 is a diagram showing a conventional linear capture device using a dielectric multilayer mirror.
- This device is composed of dielectric multilayer mirrors 51 and 51 arranged in parallel.
- the number of reflections of the light pulse 52 by the dielectric multilayer mirrors 51 and 51 is controlled to control the amount of negative chip applied to the light pulse 52.
- Fig. 5 (a) shows the case where the number of reflections is two
- Fig. 5 (b) shows the case where the number of reflections is four
- the dotted line in the figure indicates the number of reflections shown in (a). In the case of times, it indicates the light vehicle reason.
- the optical axis shifts for each set number of reflections, that is, every time the amount of capture is changed.
- a device capable of changing the amount of a cap using a conventional dielectric multilayer mirror requires an optical axis alignment every time the amount of the cap is changed, or a device for re-adjusting the optical axis. It required an optical system, which was extremely inconvenient. Disclosure of the invention
- the present invention provides a variable-capacity variable device using a dielectric multilayer film mirror, which comprises an optical-frequency linear variable-chamber variable device that does not require optical axis alignment to change the amount of capture.
- the purpose is to provide.
- an optical frequency linear chirp amount variable device of the present invention comprises two dielectric multilayer mirrors arranged in parallel with the dielectric multilayer surfaces facing each other, and the two dielectric multilayer mirrors.
- a movable mirror disposed in a space sandwiched between the membrane mirrors, the movable mirror having a predetermined inclination and being movable in a predetermined direction.
- Incident light that is obliquely incident from one end of the space sandwiched by the multilayer mirrors and reflected multiple times is parallel to the dielectric multilayer mirror surface, and the incident surface is determined by the incident light and the surface normal of the dielectric multilayer mirror.
- the predetermined direction is a direction parallel to the mirror surface of the dielectric multilayer film and within the plane of incidence, and the movable mirror is moved forward or backward along this direction to change the amount of the added tip.
- a variable quantity device can be provided.
- the second configuration of the optical frequency linear capture amount variable device comprises two dielectric multilayer mirrors arranged in parallel with each other with the dielectric multilayer surfaces facing each other, and two dielectric mirrors.
- a first movable mirror having a predetermined inclination and being movable in a predetermined direction and disposed in a space sandwiched between the multilayer mirrors;
- the inclination of the mirror is such that incident light incident parallel to the dielectric multilayer mirror surface is reflected from one end of the space sandwiched by the dielectric multilayer mirrors, and the incident light and the dielectric multilayer mirror surface method
- the inclination of the second movable mirror is such that incident light reflected a plurality of times is parallel to the dielectric multilayer film mirror surface, within the entrance surface, and This is the inclination that reflects toward the other end of the space.
- the predetermined direction is a direction parallel to the mirror surface of the dielectric multilayer film and within the plane of incidence.
- the second optical frequency linear trap quantity variable device is characterized in that the direction of light incident on the device and the direction of emission are the same.
- the third configuration of the optical frequency linear chirp amount variable device comprises two dielectric multilayer mirrors arranged in parallel with each other with the dielectric multilayer surfaces facing each other, and two dielectric mirrors.
- a third electrode having a predetermined inclination and disposed at the center of the space sandwiched by the electric multilayer mirrors;
- the inclination of the first reflecting surface having a predetermined inclination of the fixed mirror is such that incident light incident parallel to the dielectric multilayer mirror surface from one end of a space sandwiched between the two dielectric multilayer mirrors is provided. Is reflected multiple times within the incident surface determined by the incident light and the normal to the dielectric multilayer mirror surface, and the predetermined tilt of the first movable mirror reflects the incident light reflected multiple times.
- the inclination parallel to the mirror surface of the dielectric multilayer film and reflected in the plane of incidence, and the predetermined inclination of the second movable mirror reflects the light reflected by the first movable mirror, and is reflected in the plane of incidence.
- the inclination of the second reflecting surface having a predetermined inclination of the fixed mirror is an inclination to be reflected a plurality of times. This is an inclination that reflects light that has been reflected multiple times and is reflected parallel to the mirror surface of the dielectric multilayer film and within the plane of incidence.
- the predetermined direction is a direction parallel to the mirror surface of the dielectric multilayer film and within the plane of incidence.
- the third configuration light incident parallel to the dielectric multilayer mirror surface from one end of the two dielectric multilayer mirrors arranged in parallel to each other is reflected by the first reflecting surface of the fixed mirror.
- the light is reflected a plurality of times between the dielectric multilayer mirrors to reach the first movable mirror, is reflected by the first movable mirror in the same direction as the incident direction, reaches the first movable mirror, and is moved to the second movable mirror.
- And is reflected multiple times between one dielectric multilayer mirror to reach the second reflecting surface of the fixed mirror, reflected by the second reflecting surface and sandwiched between the two dielectric multilayer mirrors. From the other end of the space in the same direction as the incident direction.
- the distance between the first movable mirror and the second movable mirror is controlled to change the amount of the added tip.
- the number of reflections of incident light is controlled by controlling the distance between the first movable mirror and the first movable mirror. Since the emitted light can be obtained and reflected without being limited by the thickness of the movable mirror, the incident angle can be made smaller, and as a result, the number of reflections per unit length can be increased. Can control a larger amount of turbulence.
- the apparatus of the present invention does not require the optical axis alignment of (1) to change the amount of chirp, and the amount of chirp added to the pulse is determined by the number of reflections because the amount of chirp is determined by one reflection. You can check immediately. Also, since it is a dielectric multilayer film, it can withstand the use of high-energy light pulses. In addition, the device has a simple structure, so it can be miniaturized, and has low cost and excellent convenience. As described above, according to the device of the present invention, all the problems of the conventional tip amount control device can be overcome. BRIEF DESCRIPTION OF THE FIGURES
- FIG. 1 is a diagram showing the configuration of a first embodiment of the optical frequency trap amount varying device of the present invention.
- FIG. 1 is a diagram showing a configuration of a first embodiment of an optical frequency chirp amount varying device according to the present invention.
- FIG. 3 is a diagram showing a configuration of a third embodiment of the optical frequency trap amount varying device according to the present invention.
- FIG. 4 is a diagram showing measurement results of the example.
- FIG. 5 is a schematic configuration diagram showing a conventional linear capture device using a dielectric multilayer mirror. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 is a diagram showing a configuration of a first embodiment of an optical frequency chirp amount varying device according to the present invention.
- (A) shows the configuration of this apparatus, and (b) schematically shows the incident surface determined by the incident light and the normal to the dielectric multilayer mirror.
- the optical frequency chirp amount variable device 10 of the present invention faces the dielectric multilayer film surfaces 2a and 2a.
- a dielectric multilayer mirror 2, 2 arranged in parallel with each other and a space 3 interposed between the dielectric multilayer mirrors 2, 2 having a predetermined inclination and in a predetermined direction.
- a movable movable mirror 4 is a diagram showing a configuration of a first embodiment of an optical frequency chirp amount varying device according to the present invention.
- the dielectric multilayer mirrors 2, 2 are formed by alternately laminating a plurality of optical thin films having different refractive indexes (dielectric constants) by controlling the film thickness.
- Optical material is high damage threshold for optical energy of all, for example, because it uses S i 0 2 and T i 0 2 as a dielectric multilayer film, withstand the use of high energy light pulses.
- the tilt of the movable mirror 4 is such that the incident light 5 obliquely incident from one end 3 a of the space 3 and reflected a plurality of times between the dielectric multilayer surfaces 2 a and 2 a is reflected by the dielectric multilayer mirror surface in the entrance surface 7.
- the tilt reflects in the direction parallel to 2a and in the direction of one end 3a of the space 3.
- the incident plane is a plane 7 determined by the ray vector of the incident light 5 and the surface normal vector 6 of the dielectric multilayer mirror surface 2a as shown in FIG.
- the incident angle is the angle between the ray vector of the incident light 5 and the surface normal vector 6, and the same applies to the following description.
- the movable direction of the movable mirror 4 is parallel to the dielectric multilayer film mirror surface 2a and within the incident plane.
- the movable mirror 4 is moved forward or backward along this direction, and the movable mirror 4 is heated. Make the amount variable.
- FIG. 2 shows the configuration of a first embodiment of the optical frequency linear chirp amount variable device of the present invention.
- FIG. 1 the incident direction and the outgoing direction are different, but this device is characterized in that the incoming direction and the outgoing direction can be aligned.
- the optical frequency linear chirp amount variable device 20 of the second embodiment includes two dielectric multilayer mirrors 2, 2 having dielectric multilayer surfaces 2a, 2a facing each other and arranged in parallel with each other.
- the inclination of the first movable mirror 4a is such that the incident light 5 incident parallel to the dielectric multilayer mirror surface 2a from the third end 3a of the space is transmitted several times between the dielectric multilayer surfaces 2a and 2a. This is a tilt that reflects light and goes in the direction of the other end 3 b of the space 3.
- the inclination of the first movable mirror 4b is such that the incident light 5 reflected a plurality of times is parallel to the dielectric multilayer mirror surface 2a, is reflected in the incident surface 7, and in the direction of the other end 3b of the space 3. is there.
- the movable directions of the movable mirrors 4a and 4b are parallel to the dielectric multilayer mirror surface 2a and within the incident surface 7, and along this direction, the first movable mirror 4a or the second movable By moving the mirror 4b forward or backward, the distance between the first movable mirror 4a and the second movable mirror 4b is controlled, and the amount of added cap is varied.
- the incident light 5 incident parallel to the dielectric multilayer mirror surface a from one end of one of the dielectric multilayer mirrors 2 and 2 arranged in parallel to each other is transmitted by the first movable mirror 4a. And is reflected multiple times between the dielectric multilayer surfaces 2a and 2a to reach the second movable mirror 4b, where it is reflected by the second movable mirror 4b and the two dielectric multilayer films The light exits from the other end 3b of the space 3 sandwiched between the mirrors 2, 2 in the same direction as the incident direction.
- By moving the first movable mirror 4a or the first movable mirror 4b forward or backward it is possible to change the amount of the added tip and to obtain the emitted light in the same direction as the incident direction.
- FIG. 3 shows a configuration of an optical frequency linear capture amount variable device according to a third embodiment.
- the device of the third embodiment is characterized in that the angle of incidence can be reduced, and therefore the amount of added tip can be increased.
- the optical frequency linear chirp amount variable device 30 according to the third embodiment is arranged in parallel with each other with the dielectric multilayer surfaces 2a and 2a facing each other.
- the fixed mirror 9 has a first reflecting surface 9a and a second reflecting surface 9b having a predetermined inclination, and the first movable mirror 4a and the second movable mirror 4b And is movable in a predetermined direction.
- the inclination of the first reflecting surface 9 a of the fixed mirror 9 is such that the incident light 5 incident parallel to the dielectric multilayer mirror surface 2 from one end 3 a of the space 3 is incident on the entrance surface 7 and the dielectric multilayer film surface This is a tilt that reflects multiple times between 2a and 2a and returns to the direction of the first movable mirror 4a, and the tilt of the first movable mirror 4a allows the incident light 5 reflected multiple times to enter.
- the inclination is parallel to the dielectric multilayer mirror surface 2a and reflected in the direction of the second movable mirror 4b, and the inclination of the second movable mirror 4b is equal to the inclination of the first movable mirror 4a.
- the light reflected by the mirror is reflected multiple times between the dielectric multilayer mirror surfaces 2a and 2a within the incident surface 7, and is returned to the direction of the second reflecting surface 9b of the fixed mirror 9, and is fixed.
- the inclination of the second reflecting surface 9b of the mirror 9 is such that the light reflected by the second movable mirror 4b and reflected a plurality of times is parallel to the dielectric multilayer mirror surface 2a in the incident surface 7 and the space 3 The other end of the .
- the movable directions of the movable mirrors 4a and 4b are parallel to the dielectric multilayer mirror surface 2a and within the incident surface 7, and along this direction, the first movable mirror 4a or the second movable mirror 4a is movable. By moving b forward or backward, the distance between the first movable mirror 4a and the second movable mirror 4b is controlled to vary the amount of added chapter.
- the incident light 5 incident parallel to each other (from the one end 3a of the two dielectric multilayer mirrors 2, 2 arranged in parallel to the dielectric multilayer mirror surface 2a)
- the light is reflected by the reflecting surface 9a of 1 and is reflected multiple times between the dielectric multilayer mirror surfaces 2a and 2a, reaches the first movable mirror 4a, and is directed in the same direction as the incident direction by the first movable mirror 4a.
- the light is reflected to reach the second movable mirror 4b, reflected by the second movable mirror 4b, and reflected multiple times between the dielectric multilayer mirror surfaces 2a and 2a, and the second reflection surface 9b of the fixed mirror 9 is reflected.
- the light is reflected by the second reflecting surface 9b and exits from the other end 3b of the space 3 in the same direction as the incident direction.
- the first movable mirror 4a or the second movable mirror 4b is moved forward or By moving the vehicle backward, the distance between the first movable mirror 4a and the second movable mirror 4b is controlled to change the amount of the added tip.
- the multiple reflections between the dielectric multilayer mirror surfaces 2 a and 2 a Since the light always occurs in front of the reflecting surface of the movable mirror, the incident angle of the incident light can be made smaller than in the configurations shown in FIGS. Therefore, by controlling the distance between the first movable mirror 4a and the second movable mirror 4b, the number of reflections of the incident light is controlled, and a chirp proportional to the number of reflections is added, and the incident direction And the incident light can be further reduced. As a result, the number of reflections per unit length can be increased, and a larger chip amount can be controlled.
- the present example was performed using the optical frequency linear pickup amount variable device according to the first embodiment of the present invention shown in FIG.
- the dielectric multilayer mirror used was Sigma Optical Machine GFM-SET-50fs2 manufactured by Sigma Optical Machine Co., Ltd.
- the position of the movable mirror was changed and the number of reflections was changed using the apparatus of the first embodiment.
- the instantaneous frequency of the optical pulse of the output light was measured using the FROG (Frequency Resolved Optical Gating: see the above-mentioned document 6) method.
- FIG. 4 is a diagram showing the measurement results of the example.
- the horizontal axis is the time axis
- the right vertical axis shows the electric field strength (arbitrary memory) of the femtosecond light pulse
- the left vertical axis shows the instantaneous frequency.
- Figures 4 (a), (b), and (c) show the results of measurements with increasing the number of reflections in this order.
- curve A represents the time-axis electric field intensity distribution of the femtosecond light pulse
- curve B represents the output of the FROG measurement device.
- Line C represents the instantaneous frequency obtained from curve B.
- the numerical value in the figure is an amount indicating the amount of frequency change per unit time called a plate, and is the slope of the straight line C.
- the slope of the straight line C increases in the negative direction as the number of reflections increases, and the amount of linear negative chirp increases in proportion to the number of reflections.
- the straight line C has a positive slope because the femtosecond light pulse of the incident light has a positive linear capture amount. This is because the positive linear chirp amount cannot be compensated for by the number of reflections in the measurement.
- a large amount of a chip can be added over an extremely wide frequency band, and the optical axis is aligned with the added amount of a chip ⁇ . No need. Also, output light can be obtained in a fixed direction irrespective of the incident direction of the light pulse or in the same direction as the incident direction.
- the present invention can be used for the generation of a femtosecond optical panorama having a narrower pulse width, which is required in the future, or as a challenge. It is extremely useful when used in the photochemical reaction field, the optical material processing field, or the ultra-high-speed optical communication field, which requires simple, low-cost, and arbitrary control of the amount.
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Abstract
Description
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/549,575 US7165851B2 (en) | 2003-03-24 | 2004-03-23 | Optical frequency linear chirp variable unit |
EP04722683.2A EP1615066B1 (en) | 2003-03-24 | 2004-03-23 | Optical frequency linear chirp variable unit |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2003-081170 | 2003-03-24 | ||
JP2003081170A JP3569777B1 (ja) | 2003-03-24 | 2003-03-24 | 光周波数線形チャープ量可変装置 |
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WO2004086118A1 true WO2004086118A1 (ja) | 2004-10-07 |
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PCT/JP2004/003911 WO2004086118A1 (ja) | 2003-03-24 | 2004-03-23 | 光周波数線形チャープ量可変装置 |
Country Status (4)
Country | Link |
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US (1) | US7165851B2 (ja) |
EP (1) | EP1615066B1 (ja) |
JP (1) | JP3569777B1 (ja) |
WO (1) | WO2004086118A1 (ja) |
Families Citing this family (6)
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US20070195539A1 (en) * | 2006-02-21 | 2007-08-23 | Karl Storz Gmbh & Co. Kg | Ultra wide band wireless optical endoscopic device |
EP2026124A1 (en) | 2006-05-26 | 2009-02-18 | Osaka University | Wide-band vhf-pulse light oscillator utilizing chirp pulse amplification |
US7405869B1 (en) * | 2007-05-02 | 2008-07-29 | Raytheon Company | Method and system of local oscillator signal generation |
JP5580638B2 (ja) * | 2010-03-31 | 2014-08-27 | 日立造船株式会社 | 光出力減衰器 |
KR102146831B1 (ko) * | 2014-01-29 | 2020-08-21 | 한국전자통신연구원 | 레이저 시스템 |
US9438002B2 (en) * | 2014-01-29 | 2016-09-06 | Electronics And Telecommunications Research Institute | Laser system |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001313607A (ja) * | 2000-04-27 | 2001-11-09 | Nec Corp | 分散補償器 |
US20030021527A1 (en) * | 2001-07-25 | 2003-01-30 | Fujitsu Limited | Wavelength characteristic variable apparatus |
Family Cites Families (6)
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US3498693A (en) * | 1967-01-24 | 1970-03-03 | Zenith Radio Corp | Radiation translating devices |
US3675154A (en) * | 1970-10-01 | 1972-07-04 | Bell Telephone Labor Inc | Dispersion compensation in lasers |
JPH05102587A (ja) * | 1991-10-07 | 1993-04-23 | Nec Corp | 狭帯域エキシマレーザ装置 |
JP2005236336A (ja) * | 2000-10-13 | 2005-09-02 | Oyokoden Lab Co Ltd | 複合型の光分散補償素子および光分散補償方法 |
CA2389937A1 (en) * | 2001-06-11 | 2002-12-11 | Jds Uniphase Inc. | Multi-pass configurations |
US6859320B2 (en) * | 2001-08-09 | 2005-02-22 | Oplink Communications, Inc. | Dispersion compensation using resonant cavities |
-
2003
- 2003-03-24 JP JP2003081170A patent/JP3569777B1/ja not_active Expired - Fee Related
-
2004
- 2004-03-23 EP EP04722683.2A patent/EP1615066B1/en not_active Expired - Fee Related
- 2004-03-23 WO PCT/JP2004/003911 patent/WO2004086118A1/ja active Application Filing
- 2004-03-23 US US10/549,575 patent/US7165851B2/en not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001313607A (ja) * | 2000-04-27 | 2001-11-09 | Nec Corp | 分散補償器 |
US20030021527A1 (en) * | 2001-07-25 | 2003-01-30 | Fujitsu Limited | Wavelength characteristic variable apparatus |
Non-Patent Citations (1)
Title |
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See also references of EP1615066A4 * |
Also Published As
Publication number | Publication date |
---|---|
JP3569777B1 (ja) | 2004-09-29 |
EP1615066A4 (en) | 2009-11-04 |
JP2004287243A (ja) | 2004-10-14 |
EP1615066A1 (en) | 2006-01-11 |
US20060181789A1 (en) | 2006-08-17 |
EP1615066B1 (en) | 2015-01-07 |
US7165851B2 (en) | 2007-01-23 |
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