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公开(公告)号：CA2215662A1
公开(公告)日：1997-07-31
申请号：CA2215662
申请日：1997-01-17
Applicant: CORNING INC
Inventor： COOK THOMAS A , MODAVIS ROBERT A
Abstract: Apparatus for forming a refractive index grating in a waveguide (10) in accordance with the invention includes a waveguide (10) formed from a material that changes its index of refraction when exposed to a beam of optical radiation (20), a source of coherent optical radiation for forming a beam of radiation, a mirror (12) arranged to intercept a first part of a beam and to reflect the first part of the beam through an angle, and a phase delay plate (22) arranged to intercept a second part of the beam for delaying the second part of the beam propagating through the plate, in which the mirror (12) and the phase delay plate (22) are arranged so that the first part of the beam and the second delayed part of the beam form an interference pattern on the waveguide for changing the index of refraction of the waveguide, in a pattern corresponding to the interference pattern for forming an index grating in the waveguide (10).
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公开(公告)号：CA2224652A1
公开(公告)日：1997-06-19
申请号：CA2224652
申请日：1996-12-06
Applicant: CORNING INC
Inventor： MODAVIS ROBERT A , COOK THOMAS A
Abstract: An optical coupler (10) has two fibers (20, 30) that are adjacent each other in a coupling region (12). One of the fibers has a clad doped with a photosensitive glass, such as germania. The photosensitive glass is exposed to suitable radiation to alter the index of refraction of fiber and tune the coupler (110) to the selected coupling frequency.
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公开(公告)号：CA2336329A1
公开(公告)日：2000-01-13
申请号：CA2336329
申请日：1999-06-30
Applicant: CORNING INC
Inventor： BHATIA VIKRAM , MODAVIS ROBERT A , COOK THOMAS A , ROBSON CHRISTOPHER D
Abstract: Filter gratings are formed in optical waveguides (50) having photosensitive cores by exposing the cores to actinic radiation in the form of interfering beams (38, 40) having peak intensities (72, 74) that are relatively displace d along an optical axis (64) of the waveguides. Each of the interfering beams has a single-lobed intensity profile and a degree of spatial coherence required to achieve a desired fringe contrast between the two relatively displaced beams. Index modulations in the photosensitive core match the illumination (interference) pattern of the radiation. The relative displacement of the interfering beams reduces side lobes of the gratings' spectral responses by leveling the average refractive index of the index modulations. A second exposure with the two beams but without the beams' interference effects further levels the average refractive index.
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公开(公告)号：AU704668B2
公开(公告)日：1999-04-29
申请号：AU1416697
申请日：1996-12-06
Applicant: CORNING INC
Inventor： COOK THOMAS A , MODAVIS ROBERT A
Abstract: An optical coupler 10 has two fibers 20, 30 that are adjacent each other in a coupling region 12. One of the fibers has a clad doped with a photosensitive glass, such as germania. The photosensitive glass is exposed to suitable radiation to alter the index of refraction of fiber and tune the coupler 10 to the selected coupling frequency.
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公开(公告)号：AU6706898A
公开(公告)日：1998-12-03
申请号：AU6706898
申请日：1998-05-19
Applicant: CORNING INC
Inventor： COOK THOMAS A , MODAVIS ROBERT ADAM
Abstract: The invention comprises a spatial filter and a method of spatially filtering a laser beam, particularly a high power laser beam. High spatial frequency light is nonabsorptively diverted away from low spatial frequencies. The invention provides a method of writing gratings in optical waveguide fiber that results in improved grating performance.
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Patent Agency Ranking
公开(公告)号：CA2237653A1
公开(公告)日：1998-11-29
申请号：CA2237653
申请日：1998-05-14
Applicant: CORNING INC
Inventor： COOK THOMAS A , MODAVIS ROBERT A
Abstract: The invention comprises a spatial filter and a method of spatially filtering a laser beam, particularly a high power laser beam. The inventive spatial filter and method of use is especially suited for use in an optical system for writing index gratings in optical waveguides. The invention provides a method of writing gratings in optical waveguide fiber that results in improved grating performance.
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公开(公告)号：CA2225316A1
公开(公告)日：1998-02-12
申请号：CA2225316
申请日：1997-07-29
Applicant: CORNING INC
Inventor： COOK THOMAS A , MODAVIS ROBERT A
Abstract: A variable period amplitude grating mask for use in making a long period Bragg grating is realized by a helically coiled spring. Stretching or compressing the spring changes the periodicity of the mask. A photosensitive optical waveguide, planar or fiber, is positioned within the spring coils along the major axis of the spring. Actinic radiation is incident on the masked waveguide, and induces an index perturbation in the waveguide having the periodicity of the mask. Different spring coil sizes and/or orientation of the waveguide with respect to the mask provide linear and nonlinear (chirped) grating periods. A device and method are described.
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18.发明公开METHOD OF WRITING PHOTOSENSITIVE GRATING USING LLOYD'S MIRROR 失效VERFAHREN ZUM SCHREIBEN VON PHOTOEMPFINDLICHEM GITTER UNTER VERWENDUNG EINES LLOYDSCHEN SPIEGELS
公开(公告)号：EP0817981A4
公开(公告)日：2001-01-17
申请号：EP97923399
申请日：1997-01-17
Applicant: CORNING INC
Inventor： COOK THOMAS A , MODAVIS ROBERT A
CPC classification number: G02B6/02133
Abstract: Apparatus for forming a refractive index grating in a waveguide (10) in accordance with the invention includes a waveguide (10) formed from a material that changes its index of refraction when exposed to a beam of optical radiation (20), a source of coherent optical radiation for forming a beam of radiation, a mirror (12) arranged to intercept a first part of a beam and to reflect the first part of the beam through an angle, and a phase delay plate (22) arranged to intercept a second part of the beam for delaying the second part of the beam propagating through the plate, in which the mirror (12) and the phase delay plate (22) are arranged so that the first part of the beam and the second delayed part of the beam form an interference pattern on the waveguide for changing the index of refraction of the waveguide, in a pattern corresponding to the interference pattern for forming an index grating in the waveguide (10).
Abstract translation: 根据本发明的用于在波导中形成折射率光栅的装置包括由暴露于光辐射束时改变其折射率的材料形成的波导，用于形成辐射束的相干光辐射源， 镜子，被布置成拦截光束的第一部分并且将光束的第一部分反射一角度;相位延迟板，被布置成拦截光束的第二部分，以延迟传播通过光盘的光束的第二部分 ，其中反射镜和相位延迟板被布置成使得波束的第一部分和波束的第二延迟部分在波导上形成干涉图案以改变波导的折射率，对应于 用于在波导中形成折射率光栅的干涉图案。
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公开(公告)号：EP1092165A4
公开(公告)日：2005-06-22
申请号：EP99932157
申请日：1999-06-30
Applicant: CORNING INC
Inventor： BHATIA VIKRAM , COOK THOMAS A , MODAVIS ROBERT A , ROBSON CHRISTOPHER D
CPC classification number: G02B6/02133 , G02B6/02085 , G02B6/02138 , G02B6/29347 , G02B27/58
Abstract: Filter gratings are formed in optical waveguides (50) having photosensitive cores by exposing the cores to actinic radiation in the form of interfering beams (38, 40) having peak intensities (72, 74) that are relatively displaced along an optical axis (64) of the waveguides. Each of the interfering beams has a single-lobed intensity profile and a degree of spatial coherence required to achieve a desired fringe contrast between the two relatively displaced beams. Index modulations in the photosensitive core match the illumination (interference) pattern of the radiation. The relative displacement of the interfering beams reduces side lobes of the gratings' spectral responses by leveling the average refractive index of the index modulations. A second exposure with the two beams but without the beams' interference effects further levels the average refractive index.
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公开(公告)号：EP0866990A4
公开(公告)日：2000-11-02
申请号：EP96944334
申请日：1996-12-06
Applicant: CORNING INC
Inventor： COOK THOMAS A , MODAVIS ROBERT A
CPC classification number: G02B6/283 , G02B6/243 , G02B6/2835 , G02B6/2856
Abstract: An optical coupler (10) has two fibers (20, 30) that are adjacent each other in a coupling region (12). One of the fibers has a clad doped with a photosensitive glass, such as germania. The photosensitive glass is exposed to suitable radiation to alter the index of refraction of fiber and tune the coupler (110) to the selected coupling frequency.
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