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    METHOD AND APPARATUS FOR DRAWING FIBER OPTIC COUPLER
    4.
    发明专利
    METHOD AND APPARATUS FOR DRAWING FIBER OPTIC COUPLER 未知

    公开(公告)号：CA1274983A

    公开(公告)日：1990-10-09

    申请号：CA512883

    申请日：1986-07-02

    Applicant: CORNING INC

    Inventor： KECK DONALD B

    IPC: G02B6/28 ,  C03B37/014 ,  C03B37/028 ,  G02B6/26 ,  C03B23/20 ,  C03B23/207

    Abstract: A low loss fiber optic coupler is fabricated by forming a coupler preform having a plurality of spaced glass cores extending longitudinally through a matrix of glass having a refractive index lower than that of the cores. The coupler preform is heated and stretched by first pulling means to form a glass rod which is drawn by second pulling means past an intermittant source of localized heat. When the localized heat source is turned on, the second pulling means draws the rod downwardly at a rate faster than the first pulling means. Since the rod is softened by the localized heat source, a necked-down coupling region is formed. The rod is severed to form a plurality of coupler units. When an end of a unit is immersed in acid, the matrix glass dissolves, thereby leaving the unit cores and surrounding etch-resistant cladding glass protruding from the newly formed endface of the unit.

    5.
    发明专利
    未知

    公开(公告)号：DK0737873T3

    公开(公告)日：2002-10-21

    申请号：DK96105573

    申请日：1996-04-09

    Applicant: CORNING INC

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

    IPC: C03B37/012 ,  G02B6/00 ,  C03B37/014 ,  C03B37/018 ,  C03B37/02 ,  C03B37/027 ,  G02B6/02 ,  G02B6/028 ,  G02B6/036 ,  G02B6/16

    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.

    6.
    发明专利
    未知

    公开(公告)号：DE69621974D1

    公开(公告)日：2002-08-01

    申请号：DE69621974

    申请日：1996-04-09

    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: C03B37/012 ,  G02B6/00 ,  C03B37/014 ,  C03B37/018 ,  C03B37/02 ,  C03B37/027 ,  G02B6/02 ,  G02B6/028 ,  G02B6/036 ,  G02B6/16

    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.

    N-PORT RECONFIGURABLE DWDM MULTIPLEXER AND DEMULTIPLEXER
    10.
    发明专利
    N-PORT RECONFIGURABLE DWDM MULTIPLEXER AND DEMULTIPLEXER 未知

    公开(公告)号：CA2313146A1

    公开(公告)日：1999-07-22

    申请号：CA2313146

    申请日：1999-01-07

    Applicant: CORNING INC

    Inventor： KECK DONALD B ,  NOLAN DANIEL A

    IPC: G02B6/12 ,  G02B6/293 ,  G02B6/34 ,  G02F1/01 ,  H04J14/02 ,  G02B6/26

    Abstract: An N-port optical wavelength division multiplexer (10) and demultiplexer includes two evanescent wave couplers (30, 70) connected by N optical paths (110, 112, 114, 116, 11N). Each of the optical paths includes wavelengthselecting elements (50, 52, 54, 56) that are used to select specific wavelengths of light. Light signals composed of N wavelengths of light introduced to an exterior port in one of the couplers are split substantially equally among all the optical paths within the coupler, so that each optical path exiting the coupler includes light of all the wavelengths initially introduced to the coupler. The wavelength selecting elements disposed on each optical path are situated to direct the light in a manner such that light of only the selected wavelengths interferes constructively at a given exterior coupler port and other wavelengths interfere destructively.

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