Yangtze Optical Fibre and Cable Joint Stock Limited Company

Runhan Wang

Shengya Long

Rong Huang

Ruichun Wang

Tiejun Wang

Beibei Cao

Honghai Wang

Wufeng Xiao

Haiying Wang

Gaoqing Lei

Mingfeng Mao

Hongyan Zhou

Tao Liu

TieJun Wang

Jianhua Sun

Zhiyong Wang

Gang Chen

Dewu Li

Mengxun Sun

Di Yang

Anlin Zhang

Halying Wang

Changkun Yan

Ming Cheng

A high-bandwidth bend-insensitive multimode fiber includes a core laver and a cladding including an inner cladding, a depressed cladding, and an outer cladding arranged sequentially from inside to outside. The core layer is a silicon dioxide glass layer co-doped with germanium, phosphorus (P), and fluorine (F) and has a refractive index profile in a shape of a parabola, a distribution index in a range of 2.0-2.3, a radius in a range of 23-27 &#x3bc;m, and a maximum relative refractive index difference in a range of 0.9-1.2% at its center. A contribution amount of P at the center is in a range of 0.01-0.30%. A doping amount of F increases from the center to the edge of the core layer. A contribution amount of F at the center and edge of the core layer is in range of 0.0% to &#x2212;0.1%, and &#x2212;0.40% to &#x2212;0.20%, respectively.

High-bandwidth bend-insensitive multimode fiber

A low-dispersion single-mode fiber includes a core and claddings covering the core. The core layer has a radius in a range of 3-5 &#x3bc;m and a relative refractive index difference in a range of 0.15% to 0.45%. The claddings comprise a first depressed cladding, a raised cladding, a second depressed cladding, and an outer cladding arranged sequentially from inside to outside. The first depressed cladding has a unilateral width in a range of 2-7 &#x3bc;m and a relative refractive index difference in a range of &#x2212;0.4% to 0.03%. The raised cladding has a unilateral width in a range of 2-7 &#x3bc;m and a relative refractive index difference in a range of 0.05% to 0.20%. The second depressed cladding has a unilateral width in a range of 0-8 &#x3bc;m and a relative refractive index difference in a range of 0% to &#x2212;0.2%. The outer cladding is formed of pure silicon dioxide glass.

Low-dispersion single-mode optical fiber

A small core-diameter graded-index optical fiber include a core layer and a cladding having an inner cladding layer, a depressed cladding layer, and an outer cladding layer from inside to outside thereof. The core layer has a parabolic refractive index profile with a distribution index in a range of 1.9-2.1, a radius in a range of 10-21 &#x3bc;m, and a &#x394;1 max in a range of 0.7-1.7% at a core layer center, and is a silica glass layer co-doped with germanium, phosphorus, and fluoride. The inner cladding layer is a pure silica layer or an F-doped silica glass layer, and has a unilateral width in a range of 0.5-5 &#x3bc;m and a &#x394;2 in a range of &#x2212;0.4-0%. The depressed cladding layer has a unilateral width in a range of 2-10 &#x3bc;m and a &#x394;3 in a range from &#x2212;0.8% to &#x2212;0.2%. The outer cladding layer is a pure silica glass layer.

Small core-diameter graded-index optical fiber

A high-bandwidth bend-insensitive multimode optical fiber includes a core and a cladding. A refractive index profile of the core has a parabola shape and a distribution index thereof is &#x3b1;. The core has a radius of 23-27 &#x3bc;m. A maximum relative refractive index difference of a central position of the core is 0.9%-1.2%. The core is a germanium-fluorine co-doped silicon dioxide glass layer. The central position of the core has a minimum amount of fluorine doped, and a mass percentage of fluorine content is C. A mass percentage of fluorine content of the core changes with the radius according to a function. The cladding successively comprises an inner cladding, a trench cladding, and an outer cladding from inside to outside. The optical fiber reduces bandwidth-wavelength sensitivity while improving bandwidth performance; is compatible with existing OM3/OM4 multimode optical fibers, and support wavelength-division multiplexing technology in a wavelength range of 850-950 nm.

High-bandwidth bend-insensitive multimode optical fiber

A bend-insensitive multimode optical fiber includes a core layer, and cladding layers surrounding the core layer. The core layer has a parabolic refractive index profile with &#x3b1; being 1.9-2.2, a radius being 23-27 &#x3bc;m, and a maximum relative refractive index difference being between 0.9-1.2%. The inner cladding layer has a width being 1-3 &#x3bc;m and a relative refractive index difference being between &#x2212;0.05% and 0.1%. The trench cladding layer has a width being 2-5 &#x3bc;m and a relative refractive index difference being between &#x2212;1% and &#x2212;0.3%. The core layer is a Ge/F co-doped silica glass layer, where an F doping contribution at a central position of the core layer is less than or equal to 0%, an F doping contribution at an edge portion of the core layer is greater than or equal to &#x2212;0.45%. The outer cladding layer is a pure silica glass layer.

Bend-insensitive multimode optical fiber

A single-mode fiber with a large effective area comprises a core layer and a cladding layer. The core layer is cladded with an intermediate cladding layer, and a depressed cladding layer is provided outside the intermediate cladding layer. The core layer comprises a first fiber sub core layer having a radius rof 1.5-5 &#x3bc;m and a relative refractive index difference &#x394;nof 0.05-0.22%, and a second sub core layer having a unilateral radial width (r&#x2212;r) of 1.5-5 &#x3bc;m and a relative refractive index difference &#x394;nof 0.15-0.34%, where &#x394;nis less than &#x394;n. Accordingly, the optical fiber can reach an effective area equal to or greater than 120 &#x3bc;mwhen the related parameters thereof are optimized.

Single mode optical fiber with large effective area

The invention relates to a rotary seal chuck of an optical fiber preform rod deposition lathe, comprising a fixed socket sleeve and a rotary shaft. The fixed socket sleeve is provided with a central hole base. The central hole base bears the rotary shaft through a bearing. An end of the central hole base is connected to an air hose. The rotary shaft is a hollow rotary shaft provided with a through hole. One end of the through hole communicates with the air hose, and the other end of the through hole is provided with a liner tube connecting sealing hole base. A magnetic fluid seal ring is disposed at a joint between an inner side of the rotary shaft and the central hole base of the fixed socket sleeve, to form a rotary dynamic seal. An outer side of the rotary shaft is connected to a rotary driving disk.

Rotary seal chuck of optical fiber preform rod deposition lathe

Growing community of inventors

Hubei, China

Runhan Wang