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    Optical fiber with low fictive temperature
    31.
    发明授权
    Optical fiber with low fictive temperature 有权

    公开(公告)号：US10961145B2

    公开(公告)日：2021-03-30

    申请号：US15710074

    申请日：2017-09-20

    Applicant: Corning Incorporated

    Inventor： Steven Akin Dunwoody ,  Robert Clark Moore ,  Pushkar Tandon

    IPC: C03B37/025 ,  C03B37/027 ,  C03B37/029

    Abstract: Optical fibers having low fictive temperature and methods of making such fibers are described. Management of the cooling rate of an optical fiber during fiber draw permits control over the fictive temperature of the fiber. Non-monotonic cooling rates are shown to promote reductions in fiber fictive temperature. The non-monotonic cooling includes slower cooling rates in upstream portions of the process pathway and faster cooling rates in downstream portions of the process pathway. Reduction in fiber fictive temperature is achieved by controlling the ambient temperature of the fiber to slow the cooling rate of the fiber in upstream portions of the process pathway that correspond to the fiber temperature regime in which the fiber viscosity is sufficiently low to permit efficient structural relaxation. Increases in cooling rate in downstream portions of the process pathway permit adjustment of fiber temperature as needed to meet entrance temperature requirements of downstream processing units. Lower fiber fictive temperature and lower fiber attenuation are achieved at faster draw speeds through non-monotonic cooling of fiber temperature.

    Optical fiber with low fictive temperature
    33.
    发明授权
    Optical fiber with low fictive temperature 有权

    公开(公告)号：US10696580B2

    公开(公告)日：2020-06-30

    申请号：US16189096

    申请日：2018-11-13

    Applicant: Corning Incorporated

    Inventor： Dana Craig Bookbinder ,  Ming-Jun Li ,  Bruce Warren Reding ,  Pushkar Tandon

    IPC: C03B37/029 ,  C03B37/027

    Abstract: An optical fiber with low fictive temperature along with a system and method for making the optical fiber are provided. The system includes a reheating stage that heats the fiber along the process pathway to a temperature sufficient to lower the fictive temperature of the fiber by relaxing the glass structure and/or driving the glass toward a more nearly equilibrium state. The fiber is drawn from a preform, conveyed along a process pathway, cooled and subsequently reheated to increase the time of exposure of the fiber to temperatures conducive to lowering the fictive temperature of the fiber. The process pathway may include multiple reheating stages as well as one or more fiber-turning devices.

    Single mode optical fiber with chlorine doped core and low bend loss
    36.
    发明授权
    Single mode optical fiber with chlorine doped core and low bend loss 有权

    公开(公告)号：US10444427B2

    公开(公告)日：2019-10-15

    申请号：US15660024

    申请日：2017-07-26

    Applicant: Corning Incorporated

    Inventor： Dana Craig Bookbinder ,  Ming-Jun Li ,  Snigdharaj Kumar Mishra ,  Pushkar Tandon

    IPC: G02B6/036 ,  G02B6/02 ,  G02B6/44 ,  G02B6/028

    Abstract: Single mode optical fibers with a chlorine doped core and a cladding having a fluorine doped trench region are disclosed. The optical fiber includes a chlorine doped silica core having a core alpha α≥10, a core radius r1 and maximum refractive index delta Δ1max % and a Cl concentration≥0.9 wt %. The optical fiber also has a cladding surrounding the core, the cladding having an inner and an outer cladding. The inner cladding has first and second cladding regions. The optical fiber has mode field diameter at 1310 nm of larger than 9 microns, a cable cutoff wavelength of ≤1260 nm, a zero dispersion wavelength λ0, where 1300 nm≤λ0≤1324 nm, and bend loss at 1550 nm for a 20 mm mandrel of less than 0.5 dB/turn.

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