公开(公告)号：CA2388493A1

公开(公告)日：2001-03-29

申请号：CA2388493

申请日：2000-08-25

Applicant: CORNING INC

Inventor： WELLER-BROPHY LAURA ,  KOHNKE GLENN E ,  MODAVIS ROBERT A

IPC: G02B6/13 ,  C03C15/00 ,  C03C23/00 ,  C03C25/00 ,  C03C25/002 ,  G02B5/18 ,  G02B6/02 ,  C03B37/10

Abstract: A fiber is put in a tube (34). The tube is sealed. A grating is written into the fiber in the tube (38).

公开(公告)号：AU6418699A

公开(公告)日：2000-05-22

申请号：AU6418699

申请日：1999-10-07

Applicant: CORNING INC

Inventor： BHATIA VIKRAM ,  MODAVIS ROBERT A

IPC: G02B6/122 ,  G02B5/18 ,  G02B6/02 ,  G03F7/20 ,  G02B6/34

Abstract: Optical gratings having a range of possible Bragg wavelengths can be produced using a single phase mask by exposing the mask to a non-collimated spatially filtered beam of light. A spatial filter removes high spatial frequency components from the beam, and a focusing system directs the filtered beam to a phase mask. A rate at which the beam is focused and a spacing between the phase mask and a photo-sensitive waveguide are varied to produce gratings in the waveguide having a range of possible periods.

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

IPC: G02B6/13 ,  G02B5/18 ,  G02B6/02 ,  G02B6/122 ,  G02B6/34 ,  G02B27/58 ,  G02B27/44

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.

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

IPC: G02B6/122 ,  G02B6/24 ,  G02B6/28 ,  G02B6/18

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.

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

IPC: G02B6/00 ,  G02B5/18 ,  G02B6/02 ,  G02B27/46 ,  G02B5/20 ,  G02B6/136

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.

公开(公告)号：AU4048797A

公开(公告)日：1998-02-25

申请号：AU4048797

申请日：1997-07-29

Applicant: CORNING INC

Inventor： MODAVIS ROBERT A

IPC: G02B6/122 ,  C03B37/10 ,  C03C25/62 ,  C03C25/6208 ,  G02B5/18 ,  G02B6/02 ,  G02F1/295 ,  C03B37/01 ,  C03B37/018 ,  C03B37/07 ,  C03C15/00 ,  G01J1/04 ,  G02B6/00 ,  G02B6/18 ,  G02B6/32 ,  G02B6/34 ,  H04J14/00 ,  H04J14/06

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

IPC: G02B6/34 ,  G02B5/18 ,  G02B6/02 ,  G02B6/10 ,  G02F1/225 ,  G02B6/16

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.

公开(公告)号：AU2118197A

公开(公告)日：1997-09-02

申请号：AU2118197

申请日：1997-02-04

Applicant: CORNING INC

Inventor： KECK DONALD B ,  MODAVIS ROBERT A

IPC: G02B5/18 ,  G02B6/26 ,  G02B6/32 ,  G02B6/34 ,  G02B6/42 ,  G02B27/44

Abstract: Fiber Bragg gratings of low reflectivity are given a squared reflectivity function in the form of a tophat configuration having a flat top and lacking undesirable side lobes. Such a reflectivity function for a fiber Bragg grating is achieved by interfering a diffracted beam with a plane wavefront beam so as to impose a sinc function on the resulting interference pattern that imprints the grating on an optical fiber.

公开(公告)号：CA2174055A1

公开(公告)日：1996-10-14

申请号：CA2174055

申请日：1996-04-12

Applicant: CORNING INC

Inventor： BERKEY GEORGE E ,  BHAGAVATULA VENKATA A ,  JONES PETER C ,  KECK DONALD B ,  LIU YANMING ,  MODAVIS ROBERT A ,  MORROW ALAN J ,  NEWHOUSE MARK A ,  NOLAN DANIEL A

IPC: G02B6/00 ,  C03B37/012 ,  C03B37/014 ,  C03B37/018 ,  C03B37/02 ,  C03B37/027 ,  G02B6/02 ,  G02B6/028 ,  G02B6/036 ,  G02B6/18

Abstract: A single-mode optical waveguide fiber designed to limit power penalty due to four wave mixing and a method of making the waveguide is disclosed. Variations in properties, e.g., radius or refractive index, of the waveguide fiber core provide a total dispersion which varies along the length of the waveguide. The algebraic sum of products of length times total dispersion is controlled to a pre-selected value for each waveguide fiber which makes up a system link. Proper choice of total dispersion variation magnitude and sub-length results in a system link wherein a signal travels only short distances in waveguide portions having total dispersion near zero. However, the variation of the total dispersion provides a system link which has a pre-selected dispersive effect on the signal over a selected wavelength range. The dispersive effect on the signal can be chosen to be essentially zero. A number of techniques for fabricating DM fiber are also disclosed.

公开(公告)号：EP0864115A4

公开(公告)日：2000-02-02

申请号：EP97938074

申请日：1997-07-29

Applicant: CORNING INC

Inventor： MODAVIS ROBERT A

IPC: G02B6/122 ,  C03B37/10 ,  C03C25/62 ,  G02B5/18 ,  G02B6/02 ,  G02B6/12 ,  G02B6/16

CPC classification number: G02B6/02109 ,  C03C25/62 ,  C03C25/6208

Abstract: A method for side writing Bragg gratings, having minimal birefringence, in a waveguide structure (2) is disclosed. The method employs the orientation of the polarization direction (10) of the writing light beam (8) relative to the long axis (7) of the waveguide structure (2) together with the orientation of the intrinsic birefringence slow axis (9) to effectively minimize birefringence in the subject grating.