公开(公告)号：EP4145196A1

公开(公告)日：2023-03-08

申请号：EP20888741.4

申请日：2020-11-02

申请人： Zhongtian Technology Fiber Potics Co., Ltd ,  Jiangsu Zhongtian Technology Co., Ltd. ,  Jiangdong Science and Technology Co., Ltd ,  Zhongtian Technology Advanced Materials Co., Ltd.

发明人： CAO, Shanshan ,  LIU, Zhizhong ,  SHEN, Yichun ,  JIANG, Xinli ,  WANG, Zhen ,  XU, Haitao ,  QIAN, Yigang ,  XUE, Chi ,  SU, Haiyan

IPC分类号： G02B6/036 ,  G02B6/028

摘要： An optical fiber includes, from inside to outside, a core layer, a buffer cladding layer, a recessed cladding layer, a deep fluorine doped layer, an external cladding layer, and a coating layer. The core layer is germanium doped silica. A refractive index difference between the core layer and silica is 0.37 % to 0.5 %. A refractive index of the buffer cladding layer gradual changes along the buffer cladding layer. A refractive index difference between an internal interface of the buffer cladding layer contacting with the core layer and silica is -0.05 % to 0.1 %. A refractive index of an external interface of the buffer cladding layer contacting with the recessed cladding layer is equal to a refractive index of the recessed cladding layer. A refractive index difference between the recessed cladding layer and silica is -0.12 % to -0.2 %. A refractive index difference between the deep fluorine doped layer and silica is -0.3 % to -0.5 %. The external cladding layer is made of silica. The coating layer is coated outside the external cladding layer. The optical fiber has large mode field diameter and good bending resistance.

公开(公告)号：EP3904925A1

公开(公告)日：2021-11-03

申请号：EP18900575.4

申请日：2018-12-29

申请人： Zhongtian Technology Fiber Potics Co., Ltd ,  Jiangsu Zhongtian Technology Co., Ltd. ,  Zhongtian Technology Advanced Materials Co., Ltd. ,  Jiangdong Science and Technology Co., Ltd

发明人： CAO, Shanshan ,  JIANG, Xinli ,  LIU, Zhizhong ,  SHEN, Yichun ,  WANG, Zhen ,  SU, Haiyan ,  XU, Haitao

IPC分类号： G02B6/02

摘要： The invention provides a novel optical fiber includes a single-mode core, a multi-mode layer and an outer cover layer coaxially disposed from the inside to the outside. The single-mode core is located at a center of the optical fiber and has an upper step index. The multi-mode layer surrounds the single-mode core and has a refractive index of α-profile distribution. A plurality of transition layers disposed on an inner side and/or an outer side of the multi-mode layer. The transition layers are coaxial with the single-mode core or the outer cover layer, and cling to the multi-mode layer. A refractive index of the transition layers is equal to a refractive index of a contact portion of the multi-mode layer which is in contact with the transition layers. The novel optical fiber of the invention has both single-mode transmission and multi-mode transmission, which greatly simplifies optical cable management of data centers, reduces upgrade cost of transceivers in future, and has a good low loss characteristic by including transition layers. Another design contains a lower doped layer or a recessed layer to give the optical fiber better resistance to bending.

公开(公告)号：EP3872045A1

公开(公告)日：2021-09-01

申请号：EP19937358.0

申请日：2019-12-26

申请人： Zhongtian Technology Fiber Potics Co., Ltd ,  Jiangsu Zhongtian Technology Co., Ltd. ,  Jiangdong Science and Technology Co., Ltd

发明人： DING, Chunlai ,  YANG, Guojie ,  CAO, Shanshan ,  WANG, Zhen ,  XU, Haitao ,  YOU, Guanglei ,  LIU, Zhizhong ,  SU, Haiyan ,  XUE, Chi ,  XUE, Jiping

IPC分类号： C03C13/04 ,  C03C25/1065 ,  C03C25/50 ,  C03C25/328

摘要： An optical fiber includes, from inside to outside, a quartz core layer, a quartz cladding layer, a primary coating layer made of a first polyimide coating material having a viscosity of 5000 to 8000 cps, and a secondary coating layer made of a second polyimide coating material having a viscosity of 6000 to 7000 cps. The optical fiber is resistant to temperatures of 300 to 350 degrees Celsius. The optical fiber of the present disclosure has two polyimide coating layers. By controlling the viscosity and the respective formulas of the polyimides, the optical fiber is not only resistant to high temperatures but also has low attenuation and high mechanical strength. The optical fiber is resistant to the temperature of 300 to 350 degrees Celsius. The attenuation is less than or equal to 0.8 dB/km at 1310nm, and less than or equal to 0.6dB/km at 1550nm. The screening strength is higher than 100kpsi. The optical fiber can be used in harsh environments, which has high corrosion resistance and reliability. The optical fiber can also be used in seabed.

公开(公告)号：EP3978969A1

公开(公告)日：2022-04-06

申请号：EP20923680.1

申请日：2020-10-29

申请人： Zhongtian Technology Fiber Potics Co., Ltd ,  Jiangsu Zhongtian Technology Co., Ltd. ,  Jiangdong Science and Technology Co., Ltd

发明人： YOU, Guanglei ,  CAO, Shanshan ,  ZHU, Qiansheng ,  XU, Haitao ,  SU, Haiyan ,  LIU, Zhizhong ,  XUE, Chi ,  XUE, Jiping

IPC分类号： G02B6/036 ,  C03C25/50 ,  C03B37/027 ,  C03B37/018

摘要： An optical fiber with reduced signal losses when flexed includes a core layer, a cladding layer wrapping the core layer, and a coating layer. The cladding layer includes an inner cladding layer, a first depressed layer, a second depressed layer, and an outer cladding layer that are sequentially wrapped inside to outside. A single side width of the first depressed layer is greater than a single side width of the second depressed layer, a relative refractive index of the first depressed layer is from -0.03% to -0.06%, and a relative refractive index of the second depressed layer is from -0.08% to -0.15%. First and second coating layers are applied on the outer cladding layer, a diameter of the second coating layer is 175µm~195µm. A method for preparing such optical fiber is also disclosed.

公开(公告)号：EP3872540A1

公开(公告)日：2021-09-01

申请号：EP19937360.6

申请日：2019-12-26

申请人： Zhongtian Technology Fiber Potics Co., Ltd ,  Jiangsu Zhongtian Technology Co., Ltd. ,  Jiangdong Science and Technology Co., Ltd

发明人： DING, Chunlai ,  ZHU, Qiansheng ,  CAO, Shanshan ,  WANG, Zhen ,  XU, Haitao ,  YOU, Guanglei ,  LIU, Zhizhong ,  SU, Haiyan ,  XUE, Chi

IPC分类号： G02B6/02

摘要： The present disclosure provides an optical fiber and a method for forming the optical fiber. The method includes melting a fiber preform at above 2000 degrees Celsius and drawing the fiber preform into a filament. The filament is cooled to 45 to 55 degrees Celsius. An acrylic resin or organic silicone resin is coated on the cooled filament, which is solidified by ultraviolet to obtain a primary coated filament. An organic silicone resin is coated on the primary coated filament, solidification again by ultraviolet to obtain the optical fiber. The optical fiber of the present disclosure is formed by two coating processes with the acrylic (or the organic silicon) and the organic silicon. The diameter of the finished optical fiber reaches 245µm. The optical fiber can be used at 200 degrees Celsius for a long time, and the performances are stable. The optical fiber can also be used at 250 degrees Celsius for at least 7 days.

公开(公告)号：EP4371950A1

公开(公告)日：2024-05-22

申请号：EP22879622.3

申请日：2022-11-29

申请人： Zhongtian Technology Fiber Potics Co., Ltd ,  Jiangdong Technology Co., Ltd. ,  Jiangsu Zhongtian Technology Co., Ltd.

发明人： ZHU, Qiansheng ,  DING, Chunlai ,  SHI, Zhengan ,  XU, Haitao ,  CAO, Shanshan ,  LIU, Zhizhong

IPC分类号： C03B37/023 ,  C03B37/014 ,  C03B37/027 ,  C03C25/10 ,  G02B6/036

CPC分类号： C03B2205/5520130101 ,  C03B2203/2220130101 ,  C03B2203/2320130101 ,  C03B2203/22320130101 ,  C03B2201/1220130101 ,  C03B2201/3120130101 ,  C03B37/01473 ,  C03B37/02727 ,  C03C25/106 ,  G02B6/03616 ,  G02B6/03638

摘要： The present disclosure provides an optical fiber and a preparation method thereof. The optical fiber includes a core layer, an inner cladding, a sinking layer, an outer cladding and a coating layer in sequence from inside to outside. The preparation method includes: preparing the core layer, the inner cladding and the sinking layer in sequence using a Vapor Axial Deposition (VAD) process, and preparing the outer cladding using an Outside Vapor Deposition (OVD) process to obtain an optical fiber preform precursor, collapsing and cooling to obtain an optical fiber preform, then performing melting and drawing, annealing in an atmosphere of an inert gas to obtain a bare fiber, and coating and curing to obtain the optical fiber. In the present disclosure, when manufacturing the optical fiber preform, by the adoption of a design of the oblique inner cladding combined with a wide recess and shallow fluorine doping, a refractive index difference between the core layer and the sinking layer is effectively reduced, so that the optical fiber has a higher strength, and at the same time, the bending resistance of the optical fiber is increased, so that the bending loss is greatly reduced; and the collapsed optical fiber preform adopts a specific cooling process, and is naturally cooled in the inert atmosphere after melting and drawing, so that the internal stress of the optical fiber is further reduced and the loss of the optical fiber is effectively reduced.