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    METHOD OF PRODUCING OPTICAL FIBER INCLUDING ADJUSTMENT OF CORE DIAMETER PROFILE
    1.
    发明专利
    METHOD OF PRODUCING OPTICAL FIBER INCLUDING ADJUSTMENT OF CORE DIAMETER PROFILE 失效

    公开(公告)号：JP2002012437A

    公开(公告)日：2002-01-15

    申请号：JP2001138031

    申请日：2001-05-09

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： FLEMING JAMES WILLIAM JR ,  ZYDZIK GEORGE JOHN

    IPC: C03B23/043 ,  C03B23/047 ,  C03B23/049 ,  C03B37/012 ,  C03B37/027

    Abstract: PROBLEM TO BE SOLVED: To provide a method of producing an optical fiber capable of adjusting core diameter profile for a specific fiber design in addition to providing a substantially uniform core diameter. SOLUTION: The method of producing an optical fiber comprises traversing of a heating means along the lengthwise direction of a silica based core rod to heat an area to be softened, and compressive or extensional movement is applied to the rod along the lengthwise direction of the rod during the traversing of the heating means which results in an increase or a decrease of the core diameter in the softened area. The desired core diameter profiles are achieved by providing a selective increase and/or decrease of core diameter over whole length of the core rod, such as a substantially uniform core diameter or a varying core diameter profile providing a specified characteristic such as regularly varying dispersion. Furthermore, larger size core rod can be produced through a controlled increase of core diameter including a fiber preform larger than the currently possible size.

    METHOD FOR PRODUCING OPTICAL FIBER ACCOMPANIED BY OVER- CLADDING DURING SINTERING
    2.
    发明专利
    METHOD FOR PRODUCING OPTICAL FIBER ACCOMPANIED BY OVER- CLADDING DURING SINTERING 审中-公开

    公开(公告)号：JP2002097033A

    公开(公告)日：2002-04-02

    申请号：JP2001231160

    申请日：2001-07-31

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： FLEMING JAMES WILLIAM JR ,  KAKAR SANDEEP ,  LUM RICHARD M ,  MONBERG ERIC M

    IPC: C03B37/012 ,  C03B37/016

    Abstract: PROBLEM TO BE SOLVED: To provide an improved technology for drawing an optical fiber from a preform which is assembled by using a sol-gel over-cladding pipe. SOLUTION: This technology provides a core-rod and a core-rod assembly having a bushing installed on its end. The core-rod assembly is inserted into, hung, and fixed to the over-cladding pipe 20 which is not yet sintered. Both of the assembly and the pipe are heated to sinter the pipe, which results in the formation of a preform assembly. This assembly is arranged to the drawing tower by the drawing handle 14 mounted on it and is drawn for a formation of an optical fiber by over-cladding.

    PRODUCTION OF OPTICAL FIBER BASED ON SILICA
    3.
    发明专利
    PRODUCTION OF OPTICAL FIBER BASED ON SILICA 失效

    公开(公告)号：JP2001031438A

    公开(公告)日：2001-02-06

    申请号：JP2000179740

    申请日：2000-06-15

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： FLEMING JAMES WILLIAM JR ,  MACCHESNEY JOHN BURNETTE ,  WISK PATRICK W ,  YAN MAN F

    IPC: G02B6/036 ,  C03B37/012 ,  G02B6/22

    Abstract: PROBLEM TO BE SOLVED: To obtain a complicated profile of refractive index by surrounding a core rod including the core area of the maximum refractive index with an inner side clad area layer through the VAD technique, in addition, surrounding with a clad layer formed by the MCVD technique. SOLUTION: The cross section of the single mode optical fiber comprises the core 51 formed by the VAD technique, the inner side clad layer 52 formed by the VAD technique, the layer formed by the MCVD technique 53 and the drawn clad layer 54 formed from optically inactive tube. In an embodiment, the core area 51 formed by the VAD technique has an inclined refractive index, the refractive index of the inner clad layer 52 formed by the VAD technique has a refractive index lower than that n0 of the undoped fused silica material. In addition, perform having diversified refractive index profiles can be produced, for example, by surrounding the core with a refractive ring formed by the MCVD technique having higher refractive index than n0.

    PROCESS FOR FABRICATING OPTICAL FIBER INVOLVING TUNING OF CORE DIAMETER PROFILE
    5.
    发明专利
    PROCESS FOR FABRICATING OPTICAL FIBER INVOLVING TUNING OF CORE DIAMETER PROFILE 未知

    公开(公告)号：CA2340840A1

    公开(公告)日：2001-11-09

    申请号：CA2340840

    申请日：2001-03-14

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： FLEMING JAMES WILLIAM JR ,  ZYDZIK GEORGE JOHN

    IPC: C03B23/043 ,  C03B23/047 ,  C03B23/049 ,  C03B37/012 ,  C03B37/027 ,  G02B6/00

    Abstract: A silica-based core rod is traversed by a heat source along its longitudinal axis, to provide heated, softened regions. During the traverse, compressive or tensile movements are provided along the rod's longitudinal axis, these movements inducing, respectively, increases or decreases in the core diameter at the softened regions. By providing selective core diameter increases and/or decreases across the entire length of the core rod, a desired core diameter profile is attained. It is possible to attain a substantially uniform core diameter, or a varying core diameter profile that provides particular properties, such as systematically varying dispersion. In addition, due to the ability to increase core diameter and core rod diameter in a controlled manner, it is possible to make larger core rods, and in turn larger fiber preforms, than presently possible.

    Process for fabricating silica article involving joining of discrete bodies
    7.
    发明专利
    Process for fabricating silica article involving joining of discrete bodies 未知

    公开(公告)号：AU3536400A

    公开(公告)日：2000-11-30

    申请号：AU3536400

    申请日：2000-05-17

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： FLEMING JAMES WILLIAM JR ,  ZYDZIK GEORGE JOHN

    IPC: G02B6/00 ,  C03B23/207 ,  C03B37/012 ,  C03B37/027 ,  C03B37/023

    Abstract: An improved process for fabricating a refractory dielectric article, in particular silica optical fiber, is provided. The fabrication process involves joining of two elongated bodies- typically silica preforms - end-to-end by use of an isothermal plasma torch technique and moving at least one of the bodies towards the other until their respective end faces are joined. When the process is applied to an optical fiber preform draw tower, continuous drawing is possible. A long preform made in this manner allows drawing of optical fiber with less down-time and waste than current processes. The plasma torch technique also produces low perturbations within the resultant preform, thereby increasing the amount of usable fiber.

    PROCESS FOR FABRICATING OPTICAL FIBER INVOLVING OVERCLADDINGDURING SINTERING
    8.
    发明专利
    PROCESS FOR FABRICATING OPTICAL FIBER INVOLVING OVERCLADDINGDURING SINTERING 未知

    公开(公告)号：CA2350275A1

    公开(公告)日：2002-02-01

    申请号：CA2350275

    申请日：2001-06-12

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： MONBERG ERIC M ,  KAKAR SANDEEP ,  LUM RICHARD M ,  FLEMING JAMES WILLIAM JR

    IPC: C03B37/012 ,  C03B37/016 ,  G02B6/16

    Abstract: An improved technique for assembling and drawing fiber from preforms is provided. In one embodiment, the technique involves providing a core rod assembly comprising a core rod and a bushing attached at an end of the assembly. The core rod assembly is inserted into an unsintered overcladding tube, and secured to the tube such that the core rod assembly is suspended within. The overcladding tube and the core rod assembly are heated to sinter the overcladding tube and thereby form a preform assembly. During the heating step, the bushing comes into contact with the interior of the overcladding tube, and, because the bushing has a larger diameter than the core rod, an annular gap is maintained between the core rod assembly and the interior of the overcladding tube. It is then possible to attach a draw handle to the preform assembly, place the preform assembly into a draw tower, and draw fiber from the preform assembly by an overclad during draw technique.

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