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    DEVICE CONTAINING MULTI-MODE OPTICAL FIBER
    1.
    发明专利
    DEVICE CONTAINING MULTI-MODE OPTICAL FIBER 失效

    公开(公告)号：JP2002006165A

    公开(公告)日：2002-01-09

    申请号：JP2000171035

    申请日：2000-06-07

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： GOLOWICH STEVEN EUGENE ,  REED WILLIAM ALFRED ,  RITGER ALBERT JOHN

    IPC: G02B6/028 ,  G02B6/18

    Abstract: PROBLEM TO BE SOLVED: To provide a multi-mode fiber having an improved refractive index profile in low-mode by improving the behavior of high-mode propagation in a optical fiber and compensating for the existence of a center dip. SOLUTION: The optical fiber of this invention has a core and a cladding layer surrounding the core. The interface between the cladding layer and the core forms a boundary region and the core has a modified refractive index profile which is characterized by an alpha-profile corrected by at least one among the methods of (a) combining a step formed in the refractive index and linear correction adjacent the boundary region (b) combining of refractive index ripple and linear correction adjacent the boundary region (c) being to have refractive index ridge adjacent the center of the fiber.

    DEVICE AND METHOD FOR IMPROVING BAND WIDTH OF MULTIMODE OPTICAL FIBER
    2.
    发明专利
    DEVICE AND METHOD FOR IMPROVING BAND WIDTH OF MULTIMODE OPTICAL FIBER 失效

    公开(公告)号：JP2001356233A

    公开(公告)日：2001-12-26

    申请号：JP2001147224

    申请日：2001-05-17

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： GOLOWICH STEVEN EUGENE ,  JONES SEAN L ,  RITGER ALBERT JOHN ,  THORNBURG K SCOTT JR

    IPC: C03B37/012 ,  G02B6/02 ,  G02B6/16

    Abstract: PROBLEM TO BE SOLVED: To provide a device and a method to improve the band width of a multimode optical fiber so as to obtain a multimode optical fiber having improved band width and differential mode delay characteristics. SOLUTION: The embodiment of the invention includes an optical fiber preform (30) and a multimode optical fiber drawn from the preform and showing improved characteristics of the excess initiation band width without decreasing the conventional laser initiation band width characteristics. The optical fiber preform has a core region (34) having refractive index with specified differential mode delay which includes a first part belonging to the lower mode operating similar to the conventional one, and a second part belonging to the upper mode different from conventional operation so as to improve the excess initiation band width in a certain operating window without giving adverse influences on the laser initiation band width characteristics in the same and other operating windows. The structure of the preform optimized for the operation at 850 nm is constituted in such a manner that the differential mode delay specific to the preform a 1300 nm increases at the beginning similar to the conventional one and becomes horizontal with a value of nearly 0 in the upper modes and that the differential mode delay specific to the preform at 850 nm keeps horizontal with a value of nearly 0 similar to the conventional one and decreases in the upper modes.

    METHOD OF MAKING AN IMPROVED MULTIMODE OPTICAL FIBER AND FIBER MADE BY METHOD
    4.
    发明专利
    METHOD OF MAKING AN IMPROVED MULTIMODE OPTICAL FIBER AND FIBER MADE BY METHOD 未知

    公开(公告)号：CA2323351A1

    公开(公告)日：2001-05-16

    申请号：CA2323351

    申请日：2000-10-17

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： REED WILLIAM ALFRED ,  JONES SEAN L ,  GOLOWICH STEVEN EUGENE ,  DIGIOVANNI DAVID JOHN

    IPC: C03B37/01 ,  C03B37/012 ,  C03B37/018 ,  C03B37/027 ,  C03B37/075 ,  G02B6/02 ,  G02B6/028 ,  G02B6/18

    Abstract: Our method of making high bandwidth silica-based multimode optical fibe r comprises provision of a non-circular preform, and drawing fiber of chiral structure from the preform. The non-circular preform can be made by maintaining the inside of the tubular preform under reduced pressure during at least part of the collapse, resulting in a non-circular core and cladding. It can also be made by remova l (e.g., by grinding or plasma etching) of appropriate portions of the preform, resulting in a circular core and non-circular cladding. In the latter case, fiber is drawn at a relatively high temperature such that, due to surface tension, the cladding assumes substantially circular shape and the core assumes a non-circular shape. The chiral structure is imposed on the fiber in any appropriate way, e.g., by twisting during fiber drawing the fiber alternately in clockwise and couterclockwise sense relative to the preform.

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