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    Apodization of optical filters formed in photosensitive media
    11.
    发明专利
    Apodization of optical filters formed in photosensitive media 未知

    公开(公告)号：AU4852399A

    公开(公告)日：2000-01-24

    申请号：AU4852399

    申请日：1999-06-30

    Applicant: CORNING INC

    Inventor： BHATIA VIKRAM ,  COOK THOMAS A ,  MODAVIS ROBERT 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 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.

    12.
    发明专利
    未知

    公开(公告)号：ID20355A

    公开(公告)日：1998-12-03

    申请号：ID980745

    申请日：1998-05-19

    Applicant: CORNING INC

    Inventor： COOK THOMAS A ,  MODAVIS ROBERT A

    IPC: G02B6/00 ,  G02B5/18 ,  G02B6/02 ,  G02B27/46 ,  H01S3/00

    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.

    WAVELENGTH TUNING OF PHOTO-INDUCED GRATINGS
    16.
    发明专利
    WAVELENGTH TUNING OF PHOTO-INDUCED GRATINGS 未知

    公开(公告)号：CA2346475A1

    公开(公告)日：2000-05-11

    申请号：CA2346475

    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 produce d using a single phase mask by exposing the mask to a non-collimated spatially filtered beam of light. A spatial filter (30) removes high spatial frequency components from the beam, and a focusing system (36) directs the filtered be am to a phase mask (40). A rate at which the beam is focused and a spacing between the phase mask and a photo-sensitive waveguide (12) are varied to produce gratings in the waveguide having a range of possible periods.

    18.
    发明专利
    未知

    公开(公告)号：BR9601344A

    公开(公告)日：1998-01-13

    申请号：BR9601344

    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.

    Method of writing photosensitive grating using Lloyd's mirror
    19.
    发明专利
    Method of writing photosensitive grating using Lloyd's mirror 未知

    公开(公告)号：AU2921297A

    公开(公告)日：1997-08-20

    申请号：AU2921297

    申请日：1997-01-17

    Applicant: CORNING INC

    Inventor： COOK THOMAS A ,  MODAVIS ROBERT A

    IPC: G02B6/13 ,  C03B37/023 ,  G02B5/18 ,  G02B6/02 ,  G02B6/10 ,  G02B6/34 ,  G02F1/225

    Abstract: Apparatus for forming a refractive index grating in a waveguide in accordance with the invention includes a waveguide formed from a material that changes its index of refraction when exposed to a beam of optical radiation, a source of coherent optical radiation for forming a beam of radiation, a mirror 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 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 and the phase delay plate 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.

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