Yangtze Optical Fibre and Cable Joint Stock Limited Company

Yangtze Optical Fibre and Cable Company, Ltd.

Yangze Optical Fibre and Cable Company Ltd.

Chen Yang

Weijun Tong

Jie Luo

Beibei Cao

Kun Yang

Song Wang

Chi Zhang

Xinben Zhang

Qingrong Han

Shen Peng

Yue Meng

Ming Tang

Jing Li

Su Chen

Zhendong Wang

Yongtao Liu

Xianyuan Ni

Jiangang Yu

Xin Mao

Tongqing Liu

Matai Radjj

A polarization-maintaining multi-core fiber includes a plurality of fiber core areas and a main outer cladding. The fiber core areas include one central fiber core area, and two or more than two outer fiber core areas equidistantly and uniformly arranged around the central fiber core area that is a polarization-maintaining fiber core area. Each outer fiber core area includes a fiber core and an inner cladding surrounding a core layer. A portion outside the fiber core areas is the main outer cladding. The fiber can greatly enhance spectral efficiency of an optical transmission system, and improve fiber communication capacity. The arrangement of the polarization-maintaining fiber core area provides a waveguide structure with a function of maintaining polarized light, which can be used for transmission of local light.

Polarization-maintaining multi-core fiber

An array-type polarization-maintaining multi-core fiber includes a main outer cladding, fiber core units, and stress units. The fiber core units and the stress units are arranged to form a unit array including one central unit and any unit in the unit array being equidistantly arranged from adjacent units thereof. Provided is at least one pair of stress units, each pair of stress units being arranged symmetrical about one fiber core unit to form a polarization-maintaining fiber core unit. The fiber core units each include a fiber core and an inner cladding surrounding a core layer. A portion outside the fiber core units and the stress units is the main outer cladding. The fiber can greatly enhance spectral efficiency of an optical transmission system, and improve fiber communication capacity.

Array-type polarization-maintaining multi-core fiber

A multimode optical fiber includes a core and a cladding covering the core. The core has a radius in a range of 23.75-26.25 &#x3bc;m. A refractive index profile of the core has a graded refractive index distribution with a refractive index distribution index &#x3b1; in a range of 1.80-1.89. The core has a maximum relative refractive index difference &#x394;1% in a range from 1.0% to 1.15%. The multimode optical fiber has a fusion loss less than or equal to 0.08 dB. The multimode optical fiber is applied in a middle-and-long distance distributed temperature-measuring system, and a temperature-measuring distance of the system reaches 10 km to 27 km. The system includes a pulsed laser light source, a wavelength division multiplexer, an avalanche photodiode, a data acquisition device, an upper computer, and the temperature-measuring multimode optical fiber.

Multimode optical fiber, application thereof and temperature-measuring system

A fused-biconical-taper bend-insensitive single mode optical fiber includes a core and a cladding. The core is a fluorine-germanium co-doped silicon-dioxide quartz glass layer, a diameter Dthereof is 7-10 &#x3bc;m, and a relative refractive index difference &#x394;thereof is 0.20% to 0.40%. A range of &#x394;Ge is 0.30% to 0.60%, and a range of &#x394;F is &#x2212;0.05% to &#x2212;0.15%. The cladding includes three layers. A first layer is a fluorine-germanium co-doped silicon-dioxide quartz glass layer, a relative refractive index difference &#x394;thereof is &#x2212;0.02% to &#x2212;0.10%, and a diameter Dthereof is 15-30 &#x3bc;m. A second layer is a fluorine-doped silicon-dioxide quartz glass layer, a relative refractive index difference &#x394;thereof is &#x2212;0.01% to &#x2212;0.05%, and a diameter Dthereof is 30-50 &#x3bc;m. A third layer is a pure silicon-dioxide quartz glass layer, and a diameter Dthereof is 124-126 &#x3bc;m.

Bend-insensitive single mode optical fiber

An optical fiber with a large effective area includes a core layer and a cladding layer. The core layer comprises an inner core layer having a radius of 1-4 &#x3bc;m and a relative refractive index difference &#x394;of &#x2212;0.2%&#x2267;&#x394;&#x3c;0% relative to the outer core layer, and an outer core layer having a radius of 4-7 &#x3bc;m and a relative refractive index difference &#x394;of &#x2212;0.15%-0.05%. &#x394;remains unchanged or increases as the radius of the inner core layer increases. The cladding layer comprises an inner cladding layer cladding the core layer and having a radius of 7-20 &#x3bc;m and a relative refractive index difference &#x394;of &#x2212;0.5%&#x2dc;&#x2212;0.1%, a depressed cladding layer has a radius of 12-40 &#x3bc;m, and a relative refractive index difference &#x394;of &#x2212;1.0%&#x2dc;&#x2212;0.3%, and an outer cladding layer having a relative refractive index difference &#x394;of &#x2212;0.2%&#x2dc;&#x2212;0.4%.

Optical fiber with large effective area

A method for manufacturing an optical fiber preform, including: a) providing a lining tube as a substrate tube, and doping and depositing by a PCVD or an MCVD process; b) in the reacting gas of silicon tetrachloride and oxygen, introducing a fluorine-containing gas for fluorine doping, introducing germanium tetrachloride for germanium doping, ionizing the reacting gas in the lining tube through microwaves to form plasma, depositing the plasma on the inner wall of the lining tube in the form of glass; c) after the completion of deposition, processing the deposited lining tube into a solid core rod by melting contraction through an electric heating furnace; d) sleeving the solid core rod into a pure quartz glass jacketing tube and manufacturing the two into an optical fiber preform; and e) allowing the effective diameter d of the optical fiber preform to become between 95 and 205 mm.

Methods for manufacturing optical fiber preform and methods for manufacturing optical fiber

A low attenuation single mode optical fiber includes a core layer and claddings. The core layer has the relative refractive index difference (RRID) &#x394;1 ranging from &#x2212;0.1% to +0.1% and the radius Rranging from 4.0 &#x3bc;m to 6.0 &#x3bc;m. The claddings have three claddings layers surrounding the core layer. The RRID of the first cladding layer &#x394;2 ranges from &#x2212;0.2% to &#x2212;0.6%, and the radius Rthereof ranges from 10 &#x3bc;m to 22 &#x3bc;m. The RRID of the second cladding layer &#x394;3 is less than &#x394;2. The RRID and radius of the first cladding layer and the RRID and radius of the second cladding layer satisfy the relationship of: V=(&#x394;2&#x2212;&#x394;3)&#xd7;(R&#x2212;R), and the value of V ranges from 0.15% &#x3bc;m to 0.8% &#x3bc;m. The third cladding layer is all the layers that closely surround the second cladding layer, and the RRID of each layer is greater than &#x394;3.

Single mode optical fiber

A single mode fiber having a core, an inner cladding, a depressed cladding, and an outer cladding composed of pure silica glass. The core is surrounded in sequence with the inner cladding and the depressed cladding. The core has silica glass doped with germanium and fluorine, with a diameter (a) of 8.0-8.8 &#x3bc;m, a relative refractive index difference (&#x394;) of 0.35-0.38%, and the contribution of fluoride (&#x394;) is &#x2212;0.09&#xb1;0.02%. The inner cladding has silica glass doped with germanium and fluorine, with a diameter (b) of 18-21 &#x3bc;m and a relative refractive index difference (&#x394;) of 0&#xb1;0.02%. The depressed cladding has silica glass doped with fluorine, with a diameter (c) of 26-36 &#x3bc;m and a relative refractive index difference (&#x394;) at the external interface thereof is between &#x2212;0.22 and &#x2212;0.35%, and a relative refractive index difference (&#x394;) at the internal interface thereof is between &#x2212;0.20 and &#x2212;0.35%, and &#x394;&#x2266;&#x394;. The fiber has a good bending resistance, good mechanical properties, and extended service lifetime, and prevents the additional stresses generated by bending from passing on to the core, thereby reducing attenuation.

Single-mode fiber and production method thereof

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Hubei, China

Chen Yang