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    METHOD OF MAKING POLARIZATION RETAINING FIBER
    43.
    发明专利
    METHOD OF MAKING POLARIZATION RETAINING FIBER 未知

    公开(公告)号：CA2054873C

    公开(公告)日：2002-04-09

    申请号：CA2054873

    申请日：1991-11-04

    Applicant: CORNING INC

    Inventor： BERKEY GEORGE E ,  BHAGAVATULA VENKATA A ,  HAWK ROBERT M ,  TARCZA STEVEN H

    IPC: G02B6/00 ,  C03B37/012 ,  C03B37/014 ,  C03B37/018 ,  C03B37/02 ,  C03C15/00 ,  C03C25/68 ,  G02B6/024 ,  C03B37/027

    Abstract: Disclosed is a method of making a polarization retaining single-mode optical fiber. Longitudinal grooves are formed on opposite sides of a cylindrically-shaped core preform having a glass core surrounded by cladding glass. The core preform is inserted into a glass tube, the tube is shrunk onto the core preform, and the interface between the core preform and the tube is fused to form a solid preform having longitudinal apertures on opposite sides of the core. An etchant gas is flowed through the apertures to enlarge the apertures into holes having a substantially round cross-section. Inserted into each aperture is a stress rod formed of glass having a coefficient of expansion different from that of the cladding glass. The resultant draw blank is drawn to form a single-mode optical fiber having a core that is subjected to a stress-induced birefringence.

    Method of making a glass preform
    44.
    发明专利
    Method of making a glass preform 未知

    公开(公告)号：AU742224B2

    公开(公告)日：2001-12-20

    申请号：AU5769399

    申请日：1999-04-14

    Applicant: CORNING INC

    Inventor： BERKEY GEORGE E ,  CHU POLLY W ,  CROSSLAND CARL E ,  MOORE LISA A ,  QI GANG ,  SOLOSKY JOHN W

    IPC: G02B6/00 ,  C03B37/012 ,  C03B37/027

    Abstract: A method of making a glass article such as an optical waveguide preform is disclosed. The method comprises drawing a rod in at least two steps. In the first step an elongated, consolidated preform having an aperture therethrough is drawn to a reduced diameter preform. The second step involves drawing the reduced diameter preform into a rod, preferably at a lower temperature than the first step. The method substantially reduces the formation of inclusions in the glass article during drawing.

    Fiber optic sensor
    47.
    发明专利
    Fiber optic sensor 未知

    公开(公告)号：AU2958600A

    公开(公告)日：2000-07-12

    申请号：AU2958600

    申请日：1999-11-30

    Applicant: CORNING INC

    Inventor： BERKEY GEORGE E ,  KROL MARK F ,  NOLAN DANIEL A

    IPC: G01K11/12 ,  G01B11/16 ,  G01D5/353 ,  G01K11/32 ,  G01L1/24 ,  G02B6/10 ,  G01B9/02 ,  G02B6/26

    Abstract: A fiber optic sensor for simultaneously and independently measuring temperature and axial stress. The fiber sensor includes a pair of polarization-maintaining fibers that have known strain and temperature response curves. Each fiber has a plurality of fiber segments in which the elliptical cores are rotated 45° relative to the preceding core segment. Thus, the phase shift induced by temperature or stress in each of the fibers is detected, and the strain and temperature are derived from the detected phase shift. The fiber optic sensor is capable of dual operation. As both a temperature sensor and an axial stress sensor.

    Broadband pulse-reshaping optical fiber
    48.
    发明专利
    Broadband pulse-reshaping optical fiber 未知

    公开(公告)号：AU2958400A

    公开(公告)日：2000-06-19

    申请号：AU2958400

    申请日：1999-11-10

    Applicant: CORNING INC

    Inventor： BERKEY GEORGE E ,  EVANS ALAN F ,  SRIKANT V

    IPC: G02B6/02 ,  G02B6/036 ,  G02B6/34 ,  G02B6/16

    Abstract: A pulse-reshaping optical fiber having a core with refractive index nc surrounded by a cladding layer, the diameter of the core changing monotonically along the length of the fiber. The core includes a central region having a maximum refractive index n1 and a moat region disposed radially adjacent to the central region. The moat region has a minimum refractive index n2 which is sufficiently low that the index delta DELTA2 of the moat region with respect to nc is not greater than -0.1%. The moat region affects the change in dispersion with respect to fiber cladding diameter, as well as providing the pulse-reshaping fiber with low dispersion versus wavelength slope. The pulse-reshaping fiber is particularly useful in association with optical transmission systems where high transmission rates and narrow pulse widths are desired, including components such as high pulse rate wavelength-division-multiplexers (WDMs) and optical regenerators.

    Method of making optical fibers
    50.
    发明专利
    Method of making optical fibers 未知

    公开(公告)号：AU3552599A

    公开(公告)日：1999-11-08

    申请号：AU3552599

    申请日：1999-04-09

    Applicant: CORNING INC

    Inventor： BERKEY GEORGE E

    IPC: G02B6/00 ,  C03B37/025 ,  C03B37/027 ,  G02B6/02 ,  C03B37/02

    Abstract: An optical fiber and method of making, wherein the optical fiber alternates between regions having different diameters along its length, wherein the refractive index of said blank and the diameters of said fiber are chosen to result in a fiber having alternating regions of positive and negative dispersion at a wavelength which is greater than 1480 nm, yet preferably has a low net dispersion and dispersion slope. A preferred such profile consists of a core region surrounded by a cladding region, said core region comprised of a central core region which is updoped with respect to said cladding region, said central core region surrounded by a moat region which is downdoped with respect to said cladding region, and said moat region is surrounded by an annular ring region which is updoped with respect to said cladding region.

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