US20010016099A1 - Apparatus and method for fabricating multi-period optical fiber grating - Google Patents
Apparatus and method for fabricating multi-period optical fiber grating Download PDFInfo
- Publication number
- US20010016099A1 US20010016099A1 US09/748,429 US74842900A US2001016099A1 US 20010016099 A1 US20010016099 A1 US 20010016099A1 US 74842900 A US74842900 A US 74842900A US 2001016099 A1 US2001016099 A1 US 2001016099A1
- Authority
- US
- United States
- Prior art keywords
- optical fiber
- mask
- period
- sector
- optical
- 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
Images
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
-
- 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
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02057—Optical fibres with cladding with or without a coating comprising gratings
- G02B6/02076—Refractive index modulation gratings, e.g. Bragg gratings
- G02B6/02123—Refractive index modulation gratings, e.g. Bragg gratings characterised by the method of manufacture of the grating
- G02B6/02142—Refractive index modulation gratings, e.g. Bragg gratings characterised by the method of manufacture of the grating based on illuminating or irradiating an amplitude mask, i.e. a mask having a repetitive intensity modulating pattern
-
- 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
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02057—Optical fibres with cladding with or without a coating comprising gratings
- G02B6/02076—Refractive index modulation gratings, e.g. Bragg gratings
- G02B6/02123—Refractive index modulation gratings, e.g. Bragg gratings characterised by the method of manufacture of the grating
- G02B6/02152—Refractive index modulation gratings, e.g. Bragg gratings characterised by the method of manufacture of the grating involving moving the fibre or a manufacturing element, stretching of the fibre
Definitions
- the present invention relates generally to a long-period optical fiber grating used as a gain equalized filter, and more particularly, to an apparatus and method for fabricating gratings of different periods.
- Fiber gratings are periodic variations in a refractive index along the length of a fiber. It is possible to make fibers in which the refractive index varies regularly along their length. These fibers are called fiber gratings as they interact with light, and their effects on light passing through them depend very strongly on the wavelength.
- an optical fiber grating is a row of fine parallel lines, usually on a reflective surface. Light waves bounce off the lines at an angle that depends on their wavelength.
- the fiber grating is used as a filter for selecting a predetermined wavelength directed to the particular core of an optical fiber as well as eliminating or reflecting light at a particular wavelength by periodically inducing the variance of a refractive index of the optical fiber through the provision of ultraviolet light.
- Ultraviolet light creates fiber gratings by breaking atomic bonds in the fiber member.
- the optical fiber grating is classified into a short-period optical fiber grating and a long-period optical fiber grating depending on its period of time.
- a short-period optical fiber grating reflects a specific wavelength for performing a filtering function.
- long-period grating (LPG) devices selectively remove light at specific wavelengths by coupling light from one optical mode of a fiber to another mode propagating in the same direction, with very low back-reflection.
- the long-period grating is utilized to couple light from a core mode to a cladding mode in the range from tens of kilometers to hundreds of kilometers, during which light at specific wavelengths can be removed.
- the long-period grating devices serve as a gain equalized filter in an erbium-doped optical fiber amplifier.
- FIG. 1 is a simplified diagram illustrating an optical fiber F with different long-period grating patterns according to the conventional art.
- the long-period grating patterns, g 1 , g 2 and g 3 exhibiting gratings of differing periods are disposed along the optical fiber F in the direction of one axis.
- the notation, F 1 , F 2 and F 3 along the optical fiber represent the respective long-period grating patterns that are interconnected for use as a gain equalized filter.
- the prior art system has some drawbacks as the gain equalizing long-period grating patterns have to be interconnected using a fusion splicer (or other similar alternatives). Moreover, the gain equalizing long-period grating patterns require an additional means, such as a contraction tube to secure the connection as the connected regions are easy to break. Furthermore, concise accuracy and costly high-tech equipment are required for the above interconnection process.
- an object of the present invention to provide an apparatus and method for fabricating a multi-period grating device using a multi-period amplitude mask with a plurality of on-off ratios.
- an apparatus for fabricating a multi-period optical fiber grating which includes: an optical source; an optical fiber having a first part of the optical fiber and at least one second part of the optical fiber continuously connected to the first part and arranged substantially in a parallel relationship with the first part of the optical fiber; and a multi-period amplitude mask disposed between the optical source and the optical fiber, wherein the multi-period mask comprising the first section with a first on-off ratio corresponding to the first part of the optical fiber and at least one second section being substantially parallel with the first sector with a second on-off ratio, and wherein gratings of differing periods can be fabricated by passing a light beam through the periodic first and second sections of the mask.
- FIG. 1 is a view illustrating the method for fabricating a gain equalized filter by interconnecting three long-period grating patterns having different periods, respectively, according to an embodiment of the conventional art
- FIG. 2 is a cross view illustrating a multi-period amplitude mask having various on-off ratios according to a preferred embodiment of the present invention
- FIG. 3 a to FIG. 3 c are top views illustrating the apparatus and method for fabricating a long-period grating using a multi-period amplitude mask according to a preferred embodiment of the present invention.
- FIG. 4 is a view illustrating the optical fiber having grating patterns fabricated by using a multi-period amplitude mask according to a preferred embodiment of the present invention.
- FIG. 2 is a cross view illustrating the amplitude mask used for fabricating an optical fiber grating according to the preferred embodiment of the present invention.
- the amplitude mask according to the present invention is a multi- mask device, which includes different shapes and spacing between troughs. Multiple sets of a series of parallel apertures are used to fabricate gratings of differing periods by introducing an external ultraviolet light source through a different periodicity of the amplitude mask 20 .
- the on-off ratio represents a ratio of the refractive index of a core that is changed by the external light source and the refractive index of the core that is not affected by the light source.
- the multi-period amplitude mask 20 shown in FIG. 2 contains the first sector 210 having a first predetermined on-off ratio, the second sector 220 having a second predetermined on-off ratio greater than the first on-off ratio, and the third section 230 having a third predetermined on-off ratio greater than the second on-off ratio.
- These different sectors 210 , 220 , and 230 are integrally formed on a single amplitude mask.
- the first, second, and third sectors 210 , 220 and 230 in the multi-period amplitude mask 20 are arranged in a substantially parallel relationship with each other along the arrow direction indicated by number 2 , and the parallel troughs in the respective on-off ratios are arranged in a parallel along the direction indicated by number 1 .
- the amplitude mask 20 according to the present invention may include different patterns have various on-off ratios and many sectors.
- FIG. 3 a to FIG. 3 b are top views illustrating the method of fabricating a multi-period grating using the multi-period amplitude mask 20 according to the present invention.
- the inventive apparatus includes an optical light source 30 , an optical fiber F where gratings of different periods are formed through the provision of light beams emitted from the optical light source 30 , and a multi-period amplitude mask 20 with multiple rows of parallel troughs for generating different patterns on the optical fiber F.
- any light source that is apparent to those in the art for creating ultraviolet light beams may be incorporated in the present invention.
- a cylindrical convex lens which is not drawn in FIG. 3 a and FIG.
- the optical light source 30 is located in a fixed position and the multi-period amplitude mask 20 and the optical fiber F are selectively translated in a spaced relation to the optical light source 30 .
- the optical fiber F is bent around several times to form the first part F 1 , the second part F 2 and the third part F 3 , and the respective parts of the optical fiber are aligned substantially parallel to each other. It should be noted that the optical fiber F may be bent a few more times in a similar manner depending on the number of on-off ratio sections provided in the amplitude mask. Accordingly, the gain equalizing long-period grating device with different periods can be fabricated by passing a light beam through the inventive multi-period amplitude mask 20 .
- an optical light source 30 is positioned above one end of the optical fiber.
- the first sector 210 of the multi-period amplitude mask 20 is disposed between the optical light source 30 and the optical fiber F.
- the first part F 1 of the optical fiber is positioned below the first sector 210 .
- the optical source 30 , the first sector 210 , and the first part F 1 of the optical fiber are positioned along the same line. If the optical source 30 emits light beams, long-period grating patterns with gratings of A 1 period are formed in plurality on the first part F 1 of the optical fiber.
- the multi-period amplitude mask 20 and the optical fiber F are slidably movable in an arrow direction (indicated by number 3 ) through the means of a carrier, which is not drawn in FIG. 3 b.
- the amplitude mask 20 and the second part F 2 of the optical fiber are moved so that the second sector 220 of the multi-period amplitude mask 20 is positioned below the fixed optical light source 30 .
- the optical light source 30 , the second sector 220 , and the second part F 2 of the optical fiber are aligned along the same line so that the second part F 2 of the optical fiber can be exposed to the light emitted through the second section 220 of the amplitude mask 20 . If ultraviolet beams are emitted by the optical source 30 , optical fiber grating patterns with gratings of A 2 period are formed along the second part F 2 of the optical fiber.
- the multi-period amplitude mask 20 and the optical fiber F are moved in the direction (indicated by an arrow 4 ) so that the third sector 230 of the multi-period amplitude mask are positioned between the fixed optical light source 30 and the third part F 3 of the optical fiber along the same line.
- optical fiber grating patterns with gratings of A 3 period are formed on the third part F 3 of the optical fiber.
- extinction ratios and bandwidths of the respective grating patterns can be adjusted by varying the emitted amount of the ultraviolet beams and the lengths of the grating patterns. Peak wavelengths of the grating patterns also can be adjusted by varying the respective periods of the amplitude mask.
- FIG. 4 is a view illustrating different grating patterns that are formed on an optical fiber by using the multi-period amplitude mask according to the present invention.
- a grating pattern of g 1 with A 1 period is formed on the first part F 1 of the optical fiber
- a grating of A 2 period is formed on the second part F 2 of the optical fiber
- a grating of A 3 period is formed on the third part F 3 of the optical fiber.
- a long-period optical fiber grating having various on-off ratios can be formed efficiently on a single optical fiber without splicing operation and the costly equipment that is required in the prior art between the respective parts of the optical fiber.
Abstract
Description
- This application makes reference to and claims all benefits accruing under 35 U.S.C. Section119 from an application entitled, “Apparatus and Method for Fabricating Multi-Period Optical Fiber Grating”, filed with the Korean Industrial Property Office on Dec. 28, 1999 and there duly assigned Ser. No. 99-64119.
- 1. Field of the Invention
- The present invention relates generally to a long-period optical fiber grating used as a gain equalized filter, and more particularly, to an apparatus and method for fabricating gratings of different periods.
- 2. Description of the Related Art
- Fiber gratings are periodic variations in a refractive index along the length of a fiber. It is possible to make fibers in which the refractive index varies regularly along their length. These fibers are called fiber gratings as they interact with light, and their effects on light passing through them depend very strongly on the wavelength.
- In general, an optical fiber grating is a row of fine parallel lines, usually on a reflective surface. Light waves bounce off the lines at an angle that depends on their wavelength. Thus, the fiber grating is used as a filter for selecting a predetermined wavelength directed to the particular core of an optical fiber as well as eliminating or reflecting light at a particular wavelength by periodically inducing the variance of a refractive index of the optical fiber through the provision of ultraviolet light. Ultraviolet light creates fiber gratings by breaking atomic bonds in the fiber member. Typically, the optical fiber grating is classified into a short-period optical fiber grating and a long-period optical fiber grating depending on its period of time.
- A short-period optical fiber grating reflects a specific wavelength for performing a filtering function. In contrast, long-period grating (LPG) devices selectively remove light at specific wavelengths by coupling light from one optical mode of a fiber to another mode propagating in the same direction, with very low back-reflection. In particular, the long-period grating is utilized to couple light from a core mode to a cladding mode in the range from tens of kilometers to hundreds of kilometers, during which light at specific wavelengths can be removed. In essence, the long-period grating devices serve as a gain equalized filter in an erbium-doped optical fiber amplifier.
- When the long-period grating is utilized as a gain equalized filter, there are some instances where the long-period grating requires multi-period gratings. FIG. 1 is a simplified diagram illustrating an optical fiber F with different long-period grating patterns according to the conventional art. Referring to FIG. 1, the long-period grating patterns, g1, g2 and g3, exhibiting gratings of differing periods are disposed along the optical fiber F in the direction of one axis. In this case, the notation, F1, F2 and F3 along the optical fiber represent the respective long-period grating patterns that are interconnected for use as a gain equalized filter.
- The prior art system has some drawbacks as the gain equalizing long-period grating patterns have to be interconnected using a fusion splicer (or other similar alternatives). Moreover, the gain equalizing long-period grating patterns require an additional means, such as a contraction tube to secure the connection as the connected regions are easy to break. Furthermore, concise accuracy and costly high-tech equipment are required for the above interconnection process.
- It is, therefore, an object of the present invention to provide an apparatus and method for fabricating a multi-period grating device using a multi-period amplitude mask with a plurality of on-off ratios.
- It is another object of the present invention to provide an apparatus and method for fabricating a multi-period grating device with gratings of differing periods formed on a single optical fiber using a multi-period amplitude mask.
- It is still another object of the present invention to provide an apparatus and method for fabricating a multi-period grating device in an economical way.
- To achieve the above objects, there is provided an apparatus for fabricating a multi-period optical fiber grating, which includes: an optical source; an optical fiber having a first part of the optical fiber and at least one second part of the optical fiber continuously connected to the first part and arranged substantially in a parallel relationship with the first part of the optical fiber; and a multi-period amplitude mask disposed between the optical source and the optical fiber, wherein the multi-period mask comprising the first section with a first on-off ratio corresponding to the first part of the optical fiber and at least one second section being substantially parallel with the first sector with a second on-off ratio, and wherein gratings of differing periods can be fabricated by passing a light beam through the periodic first and second sections of the mask.
- The above and other objects, features, and advantages of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings, in which:
- FIG. 1 is a view illustrating the method for fabricating a gain equalized filter by interconnecting three long-period grating patterns having different periods, respectively, according to an embodiment of the conventional art;
- FIG. 2 is a cross view illustrating a multi-period amplitude mask having various on-off ratios according to a preferred embodiment of the present invention;
- FIG. 3a to FIG. 3c are top views illustrating the apparatus and method for fabricating a long-period grating using a multi-period amplitude mask according to a preferred embodiment of the present invention; and,
- FIG. 4 is a view illustrating the optical fiber having grating patterns fabricated by using a multi-period amplitude mask according to a preferred embodiment of the present invention.
- A preferred embodiment of the present invention will be described herein below with reference to the accompanying drawings. For the purpose of clarity, well-known functions or constructions are not described in detail as they would obscure the invention with unnecessary detail.
- FIG. 2 is a cross view illustrating the amplitude mask used for fabricating an optical fiber grating according to the preferred embodiment of the present invention. Referring to FIG. 2, the amplitude mask according to the present invention is a multi- mask device, which includes different shapes and spacing between troughs. Multiple sets of a series of parallel apertures are used to fabricate gratings of differing periods by introducing an external ultraviolet light source through a different periodicity of the
amplitude mask 20. Here, the on-off ratio represents a ratio of the refractive index of a core that is changed by the external light source and the refractive index of the core that is not affected by the light source. - The
multi-period amplitude mask 20 shown in FIG. 2 contains thefirst sector 210 having a first predetermined on-off ratio, thesecond sector 220 having a second predetermined on-off ratio greater than the first on-off ratio, and thethird section 230 having a third predetermined on-off ratio greater than the second on-off ratio. Thesedifferent sectors third sectors multi-period amplitude mask 20 are arranged in a substantially parallel relationship with each other along the arrow direction indicated by number 2, and the parallel troughs in the respective on-off ratios are arranged in a parallel along the direction indicated by number 1. It should be noted that theamplitude mask 20 according to the present invention may include different patterns have various on-off ratios and many sectors. - FIG. 3a to FIG. 3b are top views illustrating the method of fabricating a multi-period grating using the
multi-period amplitude mask 20 according to the present invention. As shown in FIG.3, the inventive apparatus includes anoptical light source 30, an optical fiber F where gratings of different periods are formed through the provision of light beams emitted from theoptical light source 30, and amulti-period amplitude mask 20 with multiple rows of parallel troughs for generating different patterns on the optical fiber F. It is noted that any light source that is apparent to those in the art for creating ultraviolet light beams may be incorporated in the present invention. A cylindrical convex lens, which is not drawn in FIG. 3a and FIG. 3b, may be optionally disposed between theoptical light source 30 and themulti-period amplitude mask 20 to maximize the light efficiency. In the inventive invention of fabricating the multi-period grating device, theoptical light source 30 is located in a fixed position and themulti-period amplitude mask 20 and the optical fiber F are selectively translated in a spaced relation to theoptical light source 30. - With reference to FIGS. 3A and 3B, the optical fiber F is bent around several times to form the first part F1, the second part F2 and the third part F3, and the respective parts of the optical fiber are aligned substantially parallel to each other. It should be noted that the optical fiber F may be bent a few more times in a similar manner depending on the number of on-off ratio sections provided in the amplitude mask. Accordingly, the gain equalizing long-period grating device with different periods can be fabricated by passing a light beam through the inventive
multi-period amplitude mask 20. - Referring to FIG. 3a, an optical
light source 30 is positioned above one end of the optical fiber. Thefirst sector 210 of themulti-period amplitude mask 20 is disposed between the opticallight source 30 and the optical fiber F. The first part F1 of the optical fiber is positioned below thefirst sector 210. To be specific, theoptical source 30, thefirst sector 210, and the first part F1 of the optical fiber are positioned along the same line. If theoptical source 30 emits light beams, long-period grating patterns with gratings of A1 period are formed in plurality on the first part F1 of the optical fiber. As shown in FIG. 3b, themulti-period amplitude mask 20 and the optical fiber F are slidably movable in an arrow direction (indicated by number 3) through the means of a carrier, which is not drawn in FIG. 3b. - In a similar fashion, the
amplitude mask 20 and the second part F2 of the optical fiber are moved so that thesecond sector 220 of themulti-period amplitude mask 20 is positioned below the fixed opticallight source 30. The opticallight source 30, thesecond sector 220, and the second part F2 of the optical fiber are aligned along the same line so that the second part F2 of the optical fiber can be exposed to the light emitted through thesecond section 220 of theamplitude mask 20. If ultraviolet beams are emitted by theoptical source 30, optical fiber grating patterns with gratings of A2 period are formed along the second part F2 of the optical fiber. - Thereafter, as shown in FIG. 3c, the
multi-period amplitude mask 20 and the optical fiber F are moved in the direction (indicated by an arrow 4) so that thethird sector 230 of the multi-period amplitude mask are positioned between the fixed opticallight source 30 and the third part F3 of the optical fiber along the same line. Upon receiving the ultraviolet beams emitted from theoptical source 30, optical fiber grating patterns with gratings of A3 period are formed on the third part F3 of the optical fiber. - It should be noted that different extinction ratios and bandwidths of the respective grating patterns can be adjusted by varying the emitted amount of the ultraviolet beams and the lengths of the grating patterns. Peak wavelengths of the grating patterns also can be adjusted by varying the respective periods of the amplitude mask.
- FIG. 4 is a view illustrating different grating patterns that are formed on an optical fiber by using the multi-period amplitude mask according to the present invention. Referring to FIG. 4, a grating pattern of g1 with A1 period is formed on the first part F1 of the optical fiber, a grating of A2 period is formed on the second part F2 of the optical fiber, and a grating of A3 period is formed on the third part F3 of the optical fiber. By providing the optical
light source 20 in a fixed position while moving themulti-period amplitude mask 20 and the optical fiber in one direction at a predetermined velocity, a long-period optical fiber grating having various on-off ratios can be formed efficiently on a single optical fiber without splicing operation and the costly equipment that is required in the prior art between the respective parts of the optical fiber. - While the invention has been shown and described with reference to a certain preferred embodiment thereof, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and the scope of the invention as defined by the appended claims.
Claims (6)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KRP1999-64119 | 1999-12-28 | ||
KR1019990064119A KR100315671B1 (en) | 1999-12-28 | 1999-12-28 | Apparatus and method for fabricating multi-period optical fiber grating |
KR99-64119 | 1999-12-28 |
Publications (2)
Publication Number | Publication Date |
---|---|
US20010016099A1 true US20010016099A1 (en) | 2001-08-23 |
US6434301B2 US6434301B2 (en) | 2002-08-13 |
Family
ID=19631436
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/748,429 Expired - Lifetime US6434301B2 (en) | 1999-12-28 | 2000-12-26 | Apparatus and method for fabricating multi-period optical fiber grating |
Country Status (2)
Country | Link |
---|---|
US (1) | US6434301B2 (en) |
KR (1) | KR100315671B1 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20030219205A1 (en) * | 2002-03-15 | 2003-11-27 | Volodin Boris L. | Fiber optic devices having volume bragg grating elements |
US20050018743A1 (en) * | 2003-07-03 | 2005-01-27 | Volodin Boris Leonidovich | Use of volume Bragg gratings for the conditioning of laser emission characteristics |
US20060171428A1 (en) * | 2005-02-03 | 2006-08-03 | Pd-Ld, Inc. | High-power, phased-locked, laser arrays |
US7528385B2 (en) | 2002-03-15 | 2009-05-05 | Pd-Ld, Inc. | Fiber optic devices having volume Bragg grating elements |
US20100164603A1 (en) * | 2008-12-30 | 2010-07-01 | Hafez Walid M | Programmable fuse and anti-fuse elements and methods of changing conduction states of same |
US7792003B2 (en) | 2003-09-26 | 2010-09-07 | Pd-Ld, Inc. | Methods for manufacturing volume Bragg grating elements |
US8455157B1 (en) | 2007-04-26 | 2013-06-04 | Pd-Ld, Inc. | Methods for improving performance of holographic glasses |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6845194B2 (en) * | 2001-06-27 | 2005-01-18 | Furukawa Electric North America Inc. | Optical bandpass filter using long period gratings |
KR100454954B1 (en) * | 2001-12-05 | 2004-11-06 | 삼성전자주식회사 | Amplitude mask and demultiplexer applied long-period optical fiber gratings fabricated by the same |
CA2548029A1 (en) * | 2006-05-23 | 2007-11-23 | Itf Laboratories Inc. | Method and system for writing fiber bragg grating having apodized spectrum on optical fibers |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE191063T1 (en) * | 1984-08-13 | 1987-01-15 | United Technologies Corp., Hartford, Conn., Us | METHOD FOR STORING OPTICAL GRIDS IN FIBER OPTICS. |
US5400422A (en) * | 1993-01-21 | 1995-03-21 | The United States Of America As Represented By The Secretary Of The Navy | Technique to prepare high-reflectance optical fiber bragg gratings with single exposure in-line or fiber draw tower |
US5857043A (en) * | 1996-08-12 | 1999-01-05 | Corning Incorporated | Variable period amplitude grating mask and method for use |
IT1292316B1 (en) * | 1997-05-20 | 1999-01-29 | Cselt Centro Studi Lab Telecom | PROCEDURE AND DEVICE FOR THE CREATION OF FIBER BRAGG GRATINGS OR OPTICAL WAVE GUIDES. |
US6174648B1 (en) * | 1997-07-08 | 2001-01-16 | Oki Electric Industry Co., Ltd. | Optical filter fabrication method using fiber holder with spiral groove and phase mask with spiral diffraction grating |
JP2000174649A (en) * | 1998-12-09 | 2000-06-23 | Toshiba Corp | Digital broadcasting receiver |
US6344298B1 (en) * | 1999-08-26 | 2002-02-05 | Sabeus Photonics, Inc. | Circumferentially varying mask and fabrication of fiber gratings using a mask |
JP2001108844A (en) * | 1999-10-05 | 2001-04-20 | Furukawa Electric Co Ltd:The | Grating type optical component and its manufacturing method and optical module using grating type optical component |
-
1999
- 1999-12-28 KR KR1019990064119A patent/KR100315671B1/en not_active IP Right Cessation
-
2000
- 2000-12-26 US US09/748,429 patent/US6434301B2/en not_active Expired - Lifetime
Cited By (49)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7273683B2 (en) | 2002-03-15 | 2007-09-25 | Pd-Ld, Inc. | Fiber optic devices having volume bragg grating elements |
US7949216B2 (en) | 2002-03-15 | 2011-05-24 | Pd-Ld, Inc. | Bragg grating elements for optical devices |
US20050031264A1 (en) * | 2002-03-15 | 2005-02-10 | Pd-Ld, Inc. | Fiber optic devices having volume Bragg grating elements |
US7817888B2 (en) | 2002-03-15 | 2010-10-19 | Pd-Ld, Inc. | Bragg grating elements for optical devices |
US20050244102A1 (en) * | 2002-03-15 | 2005-11-03 | Pd-Ld, Inc. | Fiber optic devices having volume bragg grating elements |
US20050265657A1 (en) * | 2002-03-15 | 2005-12-01 | Pd-Ld, Inc. | Fiber optic devices having volume bragg grating elements |
US7031573B2 (en) | 2002-03-15 | 2006-04-18 | Pd-Ld, Inc. | Fiber optic devices having volume Bragg grating elements |
US7528385B2 (en) | 2002-03-15 | 2009-05-05 | Pd-Ld, Inc. | Fiber optic devices having volume Bragg grating elements |
US20060193571A1 (en) * | 2002-03-15 | 2006-08-31 | Volodin Boris L | Bragg grating elements for optical devices |
US7125632B2 (en) | 2002-03-15 | 2006-10-24 | Pd-Ld, Inc. | Fiber optic devices having volume Bragg grating elements |
US20090086297A1 (en) * | 2002-03-15 | 2009-04-02 | Pd-Ld, Inc. | Bragg grating elements for optical devices |
US7477818B2 (en) | 2002-03-15 | 2009-01-13 | Pd-Ld, Inc. | Bragg grating elements for optical devices |
US20030219205A1 (en) * | 2002-03-15 | 2003-11-27 | Volodin Boris L. | Fiber optic devices having volume bragg grating elements |
US20080267246A1 (en) * | 2003-07-03 | 2008-10-30 | Pd-Ld, Inc. | Apparatus And Methods For Altering A Characteristic Of A Light-Emitting Device |
US7633985B2 (en) | 2003-07-03 | 2009-12-15 | Pd-Ld, Inc. | Apparatus and methods for altering a characteristic of light-emitting device |
US20060256830A1 (en) * | 2003-07-03 | 2006-11-16 | Pd-Ld, Inc. | Bragg grating elements for the conditioning of laser emission characteristics |
US20060256831A1 (en) * | 2003-07-03 | 2006-11-16 | Pd-Ld, Inc. | Use of volume bragg gratings for the conditioning of laser emission characteristics |
US20070047608A1 (en) * | 2003-07-03 | 2007-03-01 | Pd-Ld, Inc. | Use of volume bragg gratings for the conditioning of laser emission characteristics |
US7248618B2 (en) | 2003-07-03 | 2007-07-24 | Pd-Ld, Inc. | Systems and methods for second harmonic generation using three-dimensional Bragg grating elements |
US7248617B2 (en) | 2003-07-03 | 2007-07-24 | Pd-Ld, Inc. | Use of volume bragg gratings for the conditioning of laser emission characteristics |
US20060256832A1 (en) * | 2003-07-03 | 2006-11-16 | Pd-Ld, Inc. | Chirped bragg grating elements |
US7298771B2 (en) * | 2003-07-03 | 2007-11-20 | Pd-Ld, Inc. | Use of volume Bragg gratings for the conditioning of laser emission characteristics |
US7397837B2 (en) | 2003-07-03 | 2008-07-08 | Pd-Ld, Inc. | Apparatus and methods for altering a characteristic of a light-emitting device |
US20080253424A1 (en) * | 2003-07-03 | 2008-10-16 | Boris Leonidovich Volodin | Use of Volume Bragg Gratings For The Conditioning Of Laser Emission Characteristics |
US20060251142A1 (en) * | 2003-07-03 | 2006-11-09 | Pd-Ld, Inc. | Apparatus and methods for altering a characteristic of a light-emitting device |
US20060251143A1 (en) * | 2003-07-03 | 2006-11-09 | Volodin Boris L | Apparatus and methods for altering a characteristic of light-emitting device |
US20060251134A1 (en) * | 2003-07-03 | 2006-11-09 | Volodin Boris L | Apparatus and methods for altering a characteristic of a light-emitting device |
US10205295B2 (en) | 2003-07-03 | 2019-02-12 | Necsel Intellectual Property, Inc. | Chirped Bragg grating elements |
US7545844B2 (en) | 2003-07-03 | 2009-06-09 | Pd-Ld, Inc. | Use of Bragg grating elements for the conditioning of laser emission characteristics |
US7590162B2 (en) | 2003-07-03 | 2009-09-15 | Pd-Ld, Inc. | Chirped bragg grating elements |
US20060256827A1 (en) * | 2003-07-03 | 2006-11-16 | Volodin Boris L | Use of bragg grating elements for the conditioning of laser emission characteristics |
US7697589B2 (en) | 2003-07-03 | 2010-04-13 | Pd-Ld, Inc. | Use of volume Bragg gratings for the conditioning of laser emission characteristics |
US9793674B2 (en) | 2003-07-03 | 2017-10-17 | Necsel Intellectual Property, Inc. | Chirped Bragg grating elements |
US8306088B2 (en) | 2003-07-03 | 2012-11-06 | Pd-Ld, Inc. | Bragg grating elements for the conditioning of laser emission characteristics |
US7796673B2 (en) | 2003-07-03 | 2010-09-14 | Pd-Ld, Inc. | Apparatus and methods for altering a characteristic of a light-emitting device |
WO2005013439A3 (en) * | 2003-07-03 | 2005-09-29 | Pd Ld Inc | Use of volume bragg gratings for the conditioning of laser emission characteristics |
US20050018743A1 (en) * | 2003-07-03 | 2005-01-27 | Volodin Boris Leonidovich | Use of volume Bragg gratings for the conditioning of laser emission characteristics |
US7792003B2 (en) | 2003-09-26 | 2010-09-07 | Pd-Ld, Inc. | Methods for manufacturing volume Bragg grating elements |
US7949030B2 (en) | 2005-02-03 | 2011-05-24 | Pd-Ld, Inc. | High-power, phased-locked, laser arrays |
US8340150B2 (en) | 2005-02-03 | 2012-12-25 | Pd-Ld, Inc. | High-power, phase-locked, laser arrays |
US8755421B2 (en) | 2005-02-03 | 2014-06-17 | Pd-Ld, Inc. | High-power, phase-locked, laser arrays |
US9130349B2 (en) | 2005-02-03 | 2015-09-08 | Pd-Ld, Inc. | High-power, phase-locked, laser arrays |
US9379514B2 (en) | 2005-02-03 | 2016-06-28 | Pd-Ld, Inc. | High-power, phased-locked, laser arrays |
US9748730B2 (en) | 2005-02-03 | 2017-08-29 | Necsel Intellectual Property, Inc. | High-power, phased-locked, laser arrays |
US20060171428A1 (en) * | 2005-02-03 | 2006-08-03 | Pd-Ld, Inc. | High-power, phased-locked, laser arrays |
US8455157B1 (en) | 2007-04-26 | 2013-06-04 | Pd-Ld, Inc. | Methods for improving performance of holographic glasses |
US9120696B2 (en) | 2007-04-26 | 2015-09-01 | Pd-Ld, Inc. | Methods for improving performance of holographic glasses |
US9377757B2 (en) | 2007-04-26 | 2016-06-28 | Pd-Ld, Inc. | Methods for improving performance of holographic glasses |
US20100164603A1 (en) * | 2008-12-30 | 2010-07-01 | Hafez Walid M | Programmable fuse and anti-fuse elements and methods of changing conduction states of same |
Also Published As
Publication number | Publication date |
---|---|
KR20010061622A (en) | 2001-07-07 |
US6434301B2 (en) | 2002-08-13 |
KR100315671B1 (en) | 2001-11-29 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US5016967A (en) | Multi-core optical waveguide Bragg grating light redirecting arrangement | |
US5061032A (en) | Optical waveguide embedded light redirecting and focusing bragg grating arrangement | |
US6307679B1 (en) | Formation of a refractive index grating | |
CA2195259C (en) | Optical signal shaping device for complex spectral shaping applications | |
US6289699B1 (en) | Wavelength selective optical couplers | |
US5982962A (en) | Fiber-integrated microlenses and optical fiber FBG couplers, spectrometers, and multiplexers comprised thereof | |
Grobnic et al. | Fiber Bragg gratings with suppressed cladding modes made in SMF-28 with a femtosecond IR laser and a phase mask | |
JP2004234031A (en) | Planar optical waveguide element | |
JPH05502952A (en) | Transverse spatial mode discrimination filter with embedded optical waveguide | |
US6434301B2 (en) | Apparatus and method for fabricating multi-period optical fiber grating | |
US6606432B2 (en) | Phase mask consisting of an array of multiple diffractive elements for simultaneous accurate fabrication of large arrays of optical couplers and method for making same | |
US6170297B1 (en) | Jig for manufacturing long period grating filter and apparatus and method for manufacturing long period grating filter using the same | |
JPH1184152A (en) | Method for writing short period reflection bragg diffraction grating using phase mask | |
US6411755B1 (en) | Cladding-assisted single-mode fiber coupler | |
CN1153074C (en) | Apparatus and method for forming fibre-optic grating by minor bending | |
KR100342507B1 (en) | Amplitude mask and optical fiber grating manufacturing apparatus using the same | |
EP1191366B1 (en) | Optical fibre grating fabrication apparatus which minimizes diffraction effects | |
US6628863B2 (en) | Long-period optical fiber grating | |
KR100382661B1 (en) | A method for a manufacturing an arc induced long period gratings in optical fiber | |
KR100377388B1 (en) | Fabrication device of overlapped long period optical fiber grating | |
WO2000029884A1 (en) | Imaged aperture mask grating writing | |
WO2001084193A1 (en) | Phase mask consisting of an array of multiple diffractive elements for simultaneous accurate fabrication of large arrays of optical couplers and method for making same | |
JP2001141942A (en) | Method of manufacturing grating type optical parts | |
ASKINS et al. | Technique to prepare high-reflectance optical fiber Bragg gratings with single exposure in-line or fiber draw tower(Patent) | |
JPH0933709A (en) | Grating forming method and optical waveguide |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: SAMSUNG ELECTRONIC CO., LTD., KOREA, REPUBLIC OF Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SHIN, SANG-GIL;KIM, MIN-SUNG;REEL/FRAME:011412/0849 Effective date: 20001221 |
|
STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
|
FEPP | Fee payment procedure |
Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
CC | Certificate of correction | ||
FPAY | Fee payment |
Year of fee payment: 4 |
|
REMI | Maintenance fee reminder mailed | ||
FPAY | Fee payment |
Year of fee payment: 8 |
|
SULP | Surcharge for late payment |
Year of fee payment: 7 |
|
FEPP | Fee payment procedure |
Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY Free format text: PAYER NUMBER DE-ASSIGNED (ORIGINAL EVENT CODE: RMPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
FPAY | Fee payment |
Year of fee payment: 12 |