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    ENERGY DELIVERY FIBER AND PREPARATION METHOD THEREFOR, AND FIBER LASER
    2.
    发明公开
    ENERGY DELIVERY FIBER AND PREPARATION METHOD THEREFOR, AND FIBER LASER 审中-实审

    公开(公告)号：EP4400877A1

    公开(公告)日：2024-07-17

    申请号：EP23866710.9

    申请日：2023-09-28

    申请人： Zhongtian Technology Advanced Materials Co., Ltd. ,  Zhongtian Technology Group Co., Ltd.

    发明人： ZHANG, Junyi ,  SHEN, Yichun ,  JIANG, Xinli ,  QIN, Yu ,  DING, Song ,  ZHOU, Hui ,  WANG, Jianqing

    IPC分类号： G02B6/02 ,  G02B6/036 ,  H01S3/067 ,  C03B37/018

    摘要： The present invention provides an energy transmitting fiber and preparation method thereof, and a fiber laser. The energy transmitting fiber includes a core layer and a cladding layer, where from a center of the energy transmitting fiber to an outer wall of the energy transmitting fiber, the core layer includes an inner core layer, an inner sinking layer and an outer core layer that are cladded sequentially, and the cladding layer is cladded on an outer wall of the outer core layer; along a direction perpendicular to an extension direction of the energy transmitting fiber, a cross-section of the inner core layer is in a circular shape, a cross-section of the inner sinking layer is in a ring shape, a cross-section of an inter wall of the outer core layer is in a circular ring shape, an outer wall of a cross-section of the outer core layer is in a rectangular ring shape, the inner core layer and the inner sinking layer are concentrically disposed, and the outer core layer is centrally symmetric along a center of the inner core layer; at least two of the inner core layer, the inner sinking layer and the outer core layer have different refractive indices. A light beam outputted by the energy transmitting fiber of the present invention has good energy uniformity, and when using the fiber laser including the energy transmitting fiber to cut a plate, it is not easy to cause damage to the plate.

    OPTICAL FIBER AND METHOD FOR MANUFACTURING OPTICAL FIBER
    8.
    发明公开
    OPTICAL FIBER AND METHOD FOR MANUFACTURING OPTICAL FIBER 审中-公开

    公开(公告)号：EP3896038A1

    公开(公告)日：2021-10-20

    申请号：EP19897402.4

    申请日：2019-12-04

    申请人： Furukawa Electric Co., Ltd.

    发明人： MUKASA, Kazunori

    IPC分类号： C03B37/018 ,  G02B6/036

    摘要： An object is to provide an optical fiber (10) having low bending loss characteristics as well as high manufacturability, and a method for manufacturing the optical fiber. An optical fiber (10) includes a central core portion (11), an intermediate layer (12) formed around the outer circumference of the central core portion (11), a trench layer (13) formed around the outer circumference of the intermediate layer (12), and a cladding portion (14) formed around the outer circumference of the trench layer (13). When, relative to the cladding portion (14), the relative refractive-index difference of the central core portion (11) is Δ1, the relative refractive-index difference of the intermediate layer (12) is Δ2, and the relative refractive-index difference of the trench layer (13) is Δ3, Δ1 > Δ2 > Δ3 and 0 > Δ3 hold, Δ1 is equal to or greater than 0.34% and equal to or less than 0.40%, |Δ3| is equal to or less than 0.25%, and Δ1 × |Δ3| is less than 0.08% 2 .

    SINGLE-MODE OPTICAL FIBER WITH ULTRALOW LOSS AND LARGE EFFECTIVE AREA AND MANUFACTURING METHOD THEREFOR
    9.
    发明公开
    SINGLE-MODE OPTICAL FIBER WITH ULTRALOW LOSS AND LARGE EFFECTIVE AREA AND MANUFACTURING METHOD THEREFOR 审中-公开

    公开(公告)号：EP3715923A1

    公开(公告)日：2020-09-30

    申请号：EP18918992.1

    申请日：2018-08-29

    申请人： FIBERHOME TELECOMMUNICATION TECHNOLOGIES CO., LTD.

    发明人： YU, Huang ,  ZHAO, Zisen ,  LUO, Cheng ,  ZHANG, Yichi

    IPC分类号： G02B6/02 ,  G02B6/036 ,  C03B37/018 ,  C03B37/027

    摘要： Disclosed in the present invention are a single-mode optical fiber with ultralow loss and a large effective area and a manufacturing method therefor. The bare optical fiber of the single-mode optical fiber comprises a core layer and a cladding layer in sequence from inside to outside. The core layer comprises an inner core layer and an outer core layer which are arranged in sequence from inside to outside. The radius R 1 of the inner core layer is 1.5-3µm, and the relative refractive index difference Δ 1 of the inner core layer is -0.01%≤Δ 1 ≤0. The radius R 2 of the outer core layer is 5-6µm, and the relative refractive index difference Δ 2 of the outer core layer is 0≤Δ 2 ≤0.05%. The core layer is hardly doped with germanium and is a silica glass layer doped with fluorine and an alkali metal oxide. The cladding layer includes a depressed cladding layer and an outer cladding layer which are arranged in sequence from inside to outside. The radius R 3 of the depressed cladding layer is 40-50µm, and the relative refractive index difference Δ 3 of the depressed cladding layer is -0.25%≤Δ 3 ≤-0.15%. The ratio R 3 /R 2 of the radius R 3 of the depressed cladding layer to the radius R 2 of the outer core layer is greater than or equal to 8. The radius R 4 of the outer cladding layer is 62.5µm, and the outer cladding layer is a pure silica glass layer. The present invention can reduce the attenuation coefficient and increase the effective area.